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Controlling residual stress and distortion of friction stir welding joint by external stationary shoulder

  • Weiliang He , Jinglin Liu , Wei Hu EMAIL logo , Gongdong Wang and Wenjing Chen
Published/Copyright: July 8, 2019
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High Temperature Materials and Processes
From the journal High Temperature Materials and Processes Volume 38 Issue 2019

Abstract

Friction stir welding (FSW) can achieve a sound welding joint, but its residual stress and distortion cannot be avoided due to the non-uniformity of temperature distribution during welding. Stationary shoulder friction stir welding (SSFSW) was employed to butt weld 6005A-T6 aluminum alloy plates. The effects of welding speeds ranging from 200 mm/min to 600 mm/min on residual stress and distortion were investigated in detail. A thermo-mechanical model was utilized to compare the residual stress distribution between conventional FSW and SSFSW. SSFSW was beneficial to decreasing the peak temperature of stir zone (SZ) and then obtaining a narrower SZ. The peak residual stress produced by SSFSW was 50% lower than that by conventional FSW and a narrower tensile stress region was attained by SSFSW. Moreover, the stationary shoulder applied a function of synchronous rolling during the welding, which controlled the distortion effectively.

Keywords: Friction stir welding; stationary shoulder; residual stress; synchronous rolling; distortion

1 Introduction

Friction stir welding (FSW) technology was invented by Wayne Thomas at TWI in 1991 [1]. As a newly emerged solid-state joining technology, FSW has been rapidly developed [2]. Huang et al. [3] revealed that frictional heat was generated by rotating tool through extrusion and stirring during FSW. Threadgill et al. [4] reported that the frictional heat induced by the rotating shoulder reached 70%– 80% of the total heat input. During FSW, the thermal expansion of weld is inhibited by the adjacent cold materials, thereby inevitably producing the welding residual stress in the welded plate [5, 6]. The residual stress has been intensively investigated in recent years. Aval et al. [7] and Kang et al. [8] reported that a relatively high longitudinal tensile stress appeared near the rotating shoulder edge. Richards et al. [9] and Altenkirch et al. [10] reported that the welding residual stress presented an ‘M’ shape along the direction perpendicular to the weld, and its peak value was located at the transition region between heat affected zone (HAZ) and stir zone (SZ). Riahi et al. [11] and Steuwer et al. [12] investigated that the peak residual stress on the upper surface of butt joint decreased with a decrease in welding speed. However, welding residual stress is an important factor which directly affects the mechanical properties of welding joint, such as yield strength and fatigue strength [13, 14]. Therefore, the burning question about how to reduce the welding residual stress to improve the mechanical properties has been attracting more and more attentions.

Stationary shoulder FSW (SSFSW) is a variant of the conventional FSW technique, and its tool system consists of an interior rotating tool and an external stationary shoulder [15]. The SSFSW is a latecomer in the welding techniques and was initially invented to weld titanium alloy to overcome uneven temperature distribution along the joint thickness [16]. Avettand et al. [17] demonstrated that the external stationary shoulder absorbed a large quantity of frictional heat, thereby resulting in a relatively narrow and uniform through-thickness temperature field. Li et al. [18] indicated that SSFSW was developed to improve the asymmetry and inhomogeneity of microstructure in aluminum alloy joint. Liu et al. [19] reported that for the joints of 2219-T6 alloy, the relatively symmetrical thermo-mechanically affected zone (TMAZ) and HAZ could be obtained by SSFSW. So far, the investigations on SSFSW have mainly focused on microstructure and mechanical properties of welding joint, and few literatures about the welding stress and distortion of SSFSW joint have been reported [20, 21].

Welding is a complex process with the coupled thermal and mechanical behaviors, which is difficult for experimental result to understand the evolution of welding stress. The finite element simulation has been verified to solve this above problem. A major thrust of current research focused on employing the ABAQUS software to analyze the temperature and stress field during SSFSW. Furthermore, the controlling effect of residual stress produced by the external stationary shoulder has been discussed.

2 Experimental procedures

In this study, 6005A-T6 aluminum alloy was selected as a target material due to its excellent extrusion formability and goodweldability [22]. Table 1 lists the chemical compositions and mechanical properties of 6005A-T6 aluminum alloy. In comparison with conventional concentric-circles-flute shoulder, a three-spiral-flute shoulder can accelerate the material flow rate [23]. On this basis, a six-spiral-flute shoulder was designed. The tools used in the conventional FSW and SSFSW technologies are illustrated in Figure 1. The stationary shoulder system consisted of an interior rotating tool and an external stationary shoulder, and this rotating tool possessed the same geometries as those of tool used in the conventional FSW process. The welding process was conducted on an FSW machine and the tilting angle of the tool was 2.5∘. Prior to welding, the surfaces of all plates were cleaned with emery papers to remove oxidation layers.

Figure 1 Schematics of (a) conventional tool and (b) stationary shoulder tool systems
Figure 1

Schematics of (a) conventional tool and (b) stationary shoulder tool systems

Table 1

Chemical compositions and mechanical properties of 6005A-T6 aluminum alloy

Chemical compositions (mass %)Mechanical properties
SiFeCuMn MgZnCrAlYield strength (MPa)Elongation (%)
0.60.350.300.50 0.500.200.30Balance145.59.7

The welding parameter combination is an important factor which directly affects the distribution of temperature and residual stress. Li et al. [24] found that the ratio of rotating speed to welding speed (n/v) greatly influenced the quality of FSW joint, and the distortion of the joint becomes more obvious with increasing the n/v. In fact, controlling the welding stress and distortion should be based on the premise of the high mechanical properties of welding joint which is greatly influenced by the n/v. According to the literature reported by Meng et al. [25], the sound 6005A-T6 alloy FSW joint can be attained when the n/v varies from 3.3 to 20, and the tensile properties of joint can reach a maximum value at approximately 5. Therefore, the rational ratios were selected and are given in Table 2. In this study, the rotating speed of 1400 rpm was constant, and the welding speeds were 200, 400 and 600 mm/min, respectively. The experimental results of joint surfaces are displayed in Figure 2, and the good surfaces without tunnel defect partly verify the rationality of welding parameters. The K-type thermocouples were used to measure the temperature during welding, which were located outside the SZ in order to avoid the damage of thermocouples induced by the rotating tool. Moreover, it is difficult for the thermocouples to attain a whole temperature evolution curve during welding, when the thermocouples are located in the SZ [26]. The positions of the K-type thermocouples are shown in Figure 3. Prior to welding, the thermocouples with 0.5 mm diameter were inserted into the holes at the advancing side (AS) and retreating side (RS) of the plate to be welded. The longitudinal residual stresses were measured by ultrasonic method after the welding. The distortions were measured by a three-coordinate-measuring machine (CMM). The displacement sensor scanned through the plate and the locations of sensor were recorded in different directions. In addition, the specimens for metallographic macrostructure were cut perpendicular to the welding direction by using an electrical discharge cutting machine. The metallographic specimens were etched with Keller’s reagent, and the macrographs of the joint cross-sections were observed using optical microscopy (OM).

Figure 2 Surface appearances of conventional FSW and SSFSW joints
Figure 2

Surface appearances of conventional FSW and SSFSW joints

Table 2

The matrix of conventional FSW and (SSFSW) welding parameters

Trial no.DesignationWelding speed mm/min (v)Rotating speed rpm (n)n/v
1F 1400/20020014007
2F 1400/4004003.5
3F 1400/6006002.3
4SS1400/2002007
5SS1400/4004003.5
6SS1400/6006002.3
Figure 3 Partial magnified diagram of the temperature measurement points
Figure 3

Partial magnified diagram of the temperature measurement points

3 Finite element modelling

The model was established in accordance with the plate size of 220 mm × 110 mm × 3 mm through the ABAQUS finite element software. Thermal and physical properties which changes with temperature are exhibited in Table 3. The mesh size around weld in Figure 4 was set as 1 mm to improve the accuracy calculation, while the larger mesh size was selected far away from the weld to reduce the calculation expense. The contact heat conductivity between the welded plate and the backing plate was 120W/(m2·∘C) and the heat convection coefficient was 40 W/(m2·∘C). In addition, a downward pressure of 7500 N between the external stationary shoulder and the welded plated was applied to the weld by surface load. The contact heat conductivity between the welded plate and the shoulder were set to be 35 W/(m2·∘C).

Figure 4 Example of FE model mesh
Figure 4

Example of FE model mesh

Table 3

The temperature-dependent material properties of 6005A-T6

Temp.ConductivitySpecific HeatYield Stress [MPa]Expansion [/∘C]Young’s Modulus
[∘C][W/m·∘C][J/kg·∘C][GPa]
20202.49192012.28E−00568
50206.3922.52002.31E−00565
100207.59251752.48E−00562
150211.59501252.57E−00558
200210975.5502.65E−00555.5
250212.5980252.73E−00552
3002081010242.79E−00544
3502051025222.82E−00542
400202.51089212.87E−00540

Based on Zhang et al. [26], the frictional heat between the rotating shoulder and the workpiece surface can be expressed as:

(1)Qs=∫roRo2πμwp(T)⋅r2dr=23πμwp(T)⋅(Ro3−ro3)

where Qs is the thermal input generated by friction between the rotating shoulder and the welded plate, w is the angular velocity, Ro is the rotating shoulder radius, ro is the rotating pin radius, P is the stress when plastic strain of 0.2% is produced and μ is the frictional coefficient. The frictional heat caused by the pin was 25% of that by the rotating shoulder [27]. The heat produced by the pin (Qp) is given by:

(2)Qp=0.25⋅Qs

4 Results and discussion

4.1 Heat source verification

The selection of the frictional coefficient is much more predominant for the current model. In this study, R0, r0 and ω in Eq. 1 are 5 mm, 2 mm, 1400 rpm, respectively. Three different frictional coefficients (μ = 0.28, μ = 0.3 and μ = 0.32) were compared to obtain an optimized one to ensure the computational accuracy.

Taking the measurement temperature point on the AS, as an example, the temperature evolutions under three different frictional coefficients are shown in Figure 5. When using the conventional tool, the peak temperatures by simulation are 179.3∘C (at μ = 0.28), 188.2∘C (at μ = 0.3) and 198∘C (at μ = 0.32). For the stationary shoulder tool system, the peak temperatures by simulation are 138.6∘C (at μ = 0.28), 140∘C (at μ = 0.3) and 143.2∘C (at μ = 0.32). According to the error of temperature between numerical and experimental results in Figure 5, the frictional coefficients for FSW and SSFSW are chosen as 0.3 and 0.32, respectively. Therefore, the temperature field during welding can be accurately described by the verified finite element

Figure 5 Comparisons of temperature history curves between experimental and numerical results: (a) conventional FSW and (b) SSFSW
Figure 5

Comparisons of temperature history curves between experimental and numerical results: (a) conventional FSW and (b) SSFSW

4.2 Temperature and stress fields during welding

During the welding process, the maximum temperature generally locates at the weld and an observed point at the weld center was selected to investigate the temperature evolution. The thermal cycle curves under different welding conditions are summarized in Figure 6. The peak temperature by conventional FSW process ranges from 410∘C to 450∘C, when the welding speed varies from 600 mm/min to 200 mm/min. The melting point of 6005A-T6 aluminum alloy is 550∘C, and the peak temperature reaches 74.5%–81.8% of the material melting point.

Figure 6 Temperature histories of weld center by simulation under different welding processes
Figure 6

Temperature histories of weld center by simulation under different welding processes

The peak temperature decreases with the increase of the welding speed because the thermal input per unit length decreases. Moreover, the conventional FSW and the SSFSW possess the same temperature history trend, and the temperature of material heightens fast when the tool approaches the observed point at the heating stage and reduces rapidly when the tool moves away at the cooling stage. For the SSFSW process, the inner rotational tool is surrounded by the external stationary shoulder and this stationary shoulder contacting with the plate top surface can absorb the heat near the weld. Therefore, the temperature during SSFSW heightens more slowly and reduces more rapidly, and the temperature history curves by SSFSW have a narrower region with high temperature compared with those by conventional FSW. model.

To compare the temperature field along the plate thickness and further verify the rationality of FE model, the cross sections attained by simulation and experiment are plotted in Figure 7. No defects are observed in all the cross sections, which further verifies the reasonability of the selected welding speeds varying from 200 mm/min to 600mm/min. During the welding process, increasing the welding speed decreases the thermal input per unit length, thereby leading to the decreased material flow velocity in SZ [28]. Therefore, the SZ width decreases with the increase of welding speed. For conventional FSW process, the cross section of SZ presents a bowl-like shape (Figure 7a). For the SSFSW process, the cross section of SZ presents a morphology similar to the tool pin, as shown in Figure 7b. The difference of cross-sectional morphology between conventional FSW and SSFSW is mainly because the external stationary shoulder can absorb the heat of plate top surface. From Figures 6 and 7, it is known that the assisted external stationary shoulder not only reduces the peak temperature in the SZ but also shrinks the region with high temperature, which is beneficial to controlling the welding residual stress and distortion.

Figure 7 Temperature maps of cross-sections under different welding processes: (a) FSW and (b) SSFSW
Figure 7

Temperature maps of cross-sections under different welding processes: (a) FSW and (b) SSFSW

Figure 8 shows the temperature and longitudinal stress fields predicted by the simulation, and four different regions are marked in the maps. For the FSW, the frictional heat generated by the rotating tool diffuses to the surrounding material during welding, and the material in front of the tool experiences the heat conduction and produces the thermal expansion. This expanded material is restricted by the surrounding cold materials, so the compressive stress is produced at region 2 in Figure 8b [5]. Region 3 presents the region where the rotating tool shoulder contacts with the plate. For this region, the welding stress of –2 MPa is close to zero under the condition of large strain, which is mainly due to the very small elasticity modulus of material with high temperature. Region 4 far away from the welding heat source possesses the low temperature close to room temperature, where the large tensile stress appears because the shrinkage of material in the weld at the cooling stage is constrained by the surrounding materials on both sides of weld. As mentioned above, the external stationary shoulder can reduce the peak temperature in the SZ, which can reduce the tensile stress. In fact, this stationary shoulder also can play a role of synchronous rolling, which can further reduce the tensile stress at the cooling stage. Therefore, the tensile stress of region 4 by SSFSW is much lower than that of region 1 by conventional FSW, and the value decreases from 69 MPa to 40 MPa.

Figure 8 Longitudinal stress and temperature fields under different processes: (a) and (b) conventional FSW; (c) and (d) SSFSW
Figure 8

Longitudinal stress and temperature fields under different processes: (a) and (b) conventional FSW; (c) and (d) SSFSW

4.3 Welding residual stress and distortion

The distributions of longitudinal residual stresses perpendicular to the weld produced by conventional FSW and SSFSW are displayed in Figure 9. An ‘M’ shaped stress distribution is clearly observed, and this similar distribution was reported in Ref. [29] on FSW of 6061-T6 aluminum alloy. Peel et al. [30] put forward that the “M” shaped stress distribution was induced by the non-uniform temperature field in the transverse section. The peak tensile residual stresses in Figure 9 are located at ±5 mm or so from the weld line. According to the geometry of the welding tool, it is known that the peak tensile residual stress appears at the edge of rotating tool shoulder. This is related to the high temperature in the SZ and the high shear force between the shoulder edge and the welded plate during welding [31]. In order to keep balance with the tensile residual stress near the weld, the compressive residual stress is produced in the region far away from the weld.

Figure 9 Longitudinal residual stress distributions perpendicular to the weld: (a) conventional FSW and (b) SSFSW
Figure 9

Longitudinal residual stress distributions perpendicular to the weld: (a) conventional FSW and (b) SSFSW

It is evident from Figure 9 that the tensile stress is asymmetric with respect to the welding center and the value on AS is about 10% higher than that on RS. This is partly because the relative motion between the rotating tool and the welded plate can produce an additional tensile stress on the materials in the weld and this relative speed on the AS is higher than that on the RS [32]. Meanwhile, the lower welding speed results in a lower tensile residual stress. At 200, 400 and 600 mm/min, the longitudinal residual stresses by conventional FSW are respectively 81, 102 and 118 MPa. Sun et al. [33] reported that the higher peak temperature during welding increased the tensile residual stress of welding joint. However, besides the peak temperature in the SZ, the temperature gradient and the cooling rate behind the rotating tool can greatly influences the tensile residual stress. Kang et al. [34] performed the investigation of 6061-T6 alloy FSW joint and stated that increasing the welding speed during welding heightened the tensile residual stress because the temperature gradient had a steep grade and an insufficient stress relief time under a higher welding speed. In this study, how the welding speed influences the residual stress (Figure 9) agrees with that in previous studies [34]. rather than [33].

As mentioned above, the external stationary shoulder can absorb the frictional heat during welding, leading to the lower peak temperature in the SZ. Generally speaking, lower peak temperature is beneficial to reducing the welding residual stress [35]. Moreover, compared with the conventional tool, the external stationary shoulder tool system can apply an extra vertical force on the weld top surface due to the addition of external stationary shoulder, resulting in an extra tensile strain in the weld. This extra tensile strain can offset the compressive plastic strain induced by the heat input during welding, leading to the decrease of tensile residual stress of welding joint. This effect on welding residual stress can be regarded as a ‘in situ direct rolling’ process (ISDR). Wen et al. [36] stated that the ISDR process gave a significant reduction in the longitudinal residual stress. In this study, the residual stress produced by SSFSW is much lower than that by the conventional FSW, which results from the above-mentioned two reasons. When the welding speeds of 200, 400 and 600 mm/min are used, the peak tensile residual stresses by SSFSW are reduced to 38.5, 52.1 and 78.9 MPa, respectively. Compared with the conventional FSW, the SSFSW process can reduce the tensile residual stress by approximately 50%.

Figure 10 gives the distortions of the conventional FSW and SSFSW joints under different welding speeds. It can be seen that the welded plate presents a saddle shape distortion. Guo et al. [37] have investigated the effect of thermal input on welding distortion. They found that the longitudinal shrinkage in the weld zone was in direct proportion to the thermal input and the distortion was similar as a saddle. Shi et al. [38] pointed out that increasing the welding speed reduced the thermal input and subsequent peak

Figure 10 Distortion curves of joints in transverse sections and longitudinal sections under different welding processes: (a) and (c) conventional FSW; (b) and (d) SSFSW
Figure 10

Distortion curves of joints in transverse sections and longitudinal sections under different welding processes: (a) and (c) conventional FSW; (b) and (d) SSFSW

temperature during welding, leading to a smaller residual distortion. The experimental results in Figure 10 agree with the results in the above two literatures. When the welding speeds of 200, 400 and 600 mm/min are used during conventional FSW, the maximum residual distortions in length are 2.5, 1.7 and 1.3 mm and these values in width are 4.5, 3.8 and 3.2 mm, respectively. Moreover, the distortion produced by the SSFSW is much smaller than that by the conventional FSW at the same welding speed, which is due to the combined effect of lower peak temperature and the synchronous rolling induced by the addition of stationary shoulder.

5 Conclusions

The stationary shoulder was employed to reduce the welding residual stress and distortion of the welding joints. 6005A-T6 alloys was chosen as the research object and the comparisons between the conventional FSW and SSFSW joints were conducted in detail. The following conclusions can be drawn on the basis of the present study.

  1. The cross section of SZ during conventional FSW presents a bowl-like shape. With increasing the welding speed, the peak temperature of SZ is reduced and the width of SZ is shrunk.

  2. Compared with conventional FSW, the temperature by SSFSW is heightened more slowly at the heating stage and is reduced more rapidly at the cooling stage. The addition of stationary shoulder can reduce the peak temperature in the SZ and shrink the region with high temperature.

  3. The welding residual stress increases with increasing the welding speed and the value on the RS is lower than that on the AS. The maximum residual stress produced by the SSFSW is approximately 50% lower than that by the conventional FSW.

  4. The welded plate presents a saddle-shaped distortion and the distortion decreases with the increase of welding speed. An additional external stationary shoulder plays a synchronous rolling role during welding, and the welding residual distortion can be effectively reduced.

Weiliang He and Jinglin Liu contributed equally to this work

  1. Funding This work is supported by the Education Department Foundation of Liaoning Province (No. L201749) and the Natural Science Foundation of Liaoning Province (No. 20180550206).

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Received: 2018-08-06
Accepted: 2018-12-20
Published Online: 2019-07-08
Published in Print: 2019-02-25

© 2019 W. He et al., published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 Public License.

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  8. Phosphate Capacities of CaO–FeO–SiO2–Al2O3/Na2O/TiO2 Slags
  9. Microstructure and Interface Bonding Strength of WC-10Ni/NiCrBSi Composite Coating by Vacuum Brazing
  10. Refill Friction Stir Spot Welding of Dissimilar 6061/7075 Aluminum Alloy
  11. Solvothermal Synthesis and Magnetic Properties of Monodisperse Ni0.5Zn0.5Fe2O4 Hollow Nanospheres
  12. On the Capability of Logarithmic-Power Model for Prediction of Hot Deformation Behavior of Alloy 800H at High Strain Rates
  13. 3D Heat Conductivity Model of Mold Based on Node Temperature Inheritance
  14. 3D Microstructure and Micromechanical Properties of Minerals in Vanadium-Titanium Sinter
  15. Effect of Martensite Structure and Carbide Precipitates on Mechanical Properties of Cr-Mo Alloy Steel with Different Cooling Rate
  16. The Interaction between Erosion Particle and Gas Stream in High Temperature Gas Burner Rig for Thermal Barrier Coatings
  17. Permittivity Study of a CuCl Residue at 13–450 °C and Elucidation of the Microwave Intensification Mechanism for Its Dechlorination
  18. Study on Carbothermal Reduction of Titania in Molten Iron
  19. The Sequence of the Phase Growth during Diffusion in Ti-Based Systems
  20. Growth Kinetics of CoB–Co2B Layers Using the Powder-Pack Boriding Process Assisted by a Direct Current Field
  21. High-Temperature Flow Behaviour and Constitutive Equations for a TC17 Titanium Alloy
  22. Research on Three-Roll Screw Rolling Process for Ti6Al4V Titanium Alloy Bar
  23. Continuous Cooling Transformation of Undeformed and Deformed High Strength Crack-Arrest Steel Plates for Large Container Ships
  24. Formation Mechanism and Influence Factors of the Sticker between Solidified Shell and Mold in Continuous Casting of Steel
  25. Casting Defects in Transition Layer of Cu/Al Composite Castings Prepared Using Pouring Aluminum Method and Their Formation Mechanism
  26. Effect of Current on Segregation and Inclusions Characteristics of Dual Alloy Ingot Processed by Electroslag Remelting
  27. Investigation of Growth Kinetics of Fe2B Layers on AISI 1518 Steel by the Integral Method
  28. Microstructural Evolution and Phase Transformation on the X-Y Surface of Inconel 718 Ni-Based Alloys Fabricated by Selective Laser Melting under Different Heat Treatment
  29. Characterization of Mn-Doped Co3O4 Thin Films Prepared by Sol Gel-Based Dip-Coating Process
  30. Deposition Characteristics of Multitrack Overlayby Plasma Transferred Arc Welding on SS316Lwith Co-Cr Based Alloy – Influence ofProcess Parameters
  31. Elastic Moduli and Elastic Constants of Alloy AuCuSi With FCC Structure Under Pressure
  32. Effect of Cl on Softening and Melting Behaviors of BF Burden
  33. Effect of MgO Injection on Smelting in a Blast Furnace
  34. Structural Characteristics and Hydration Kinetics of Oxidized Steel Slag in a CaO-FeO-SiO2-MgO System
  35. Optimization of Microwave-Assisted Oxidation Roasting of Oxide–Sulphide Zinc Ore with Addition of Manganese Dioxide Using Response Surface Methodology
  36. Hydraulic Study of Bubble Migration in Liquid Titanium Alloy Melt during Vertical Centrifugal Casting Process
  37. Investigation on Double Wire Metal Inert Gas Welding of A7N01-T4 Aluminum Alloy in High-Speed Welding
  38. Oxidation Behaviour of Welded ASTM-SA210 GrA1 Boiler Tube Steels under Cyclic Conditions at 900°C in Air
  39. Study on the Evolution of Damage Degradation at Different Temperatures and Strain Rates for Ti-6Al-4V Alloy
  40. Pack-Boriding of Pure Iron with Powder Mixtures Containing ZrB2
  41. Evolution of Interfacial Features of MnO-SiO2 Type Inclusions/Steel Matrix during Isothermal Heating at Low Temperatures
  42. Effect of MgO/Al2O3 Ratio on Viscosity of Blast Furnace Primary Slag
  43. The Microstructure and Property of the Heat Affected zone in C-Mn Steel Treated by Rare Earth
  44. Microwave-Assisted Molten-Salt Facile Synthesis of Chromium Carbide (Cr3C2) Coatings on the Diamond Particles
  45. Effects of B on the Hot Ductility of Fe-36Ni Invar Alloy
  46. Impurity Distribution after Solidification of Hypereutectic Al-Si Melts and Eutectic Al-Si Melt
  47. Induced Electro-Deposition of High Melting-Point Phases on MgO–C Refractory in CaO–Al2O3–SiO2 – (MgO) Slag at 1773 K
  48. Microstructure and Mechanical Properties of 14Cr-ODS Steels with Zr Addition
  49. A Review of Boron-Rich Silicon Borides Basedon Thermodynamic Stability and Transport Properties of High-Temperature Thermoelectric Materials
  50. Siliceous Manganese Ore from Eastern India:A Potential Resource for Ferrosilicon-Manganese Production
  51. A Strain-Compensated Constitutive Model for Describing the Hot Compressive Deformation Behaviors of an Aged Inconel 718 Superalloy
  52. Surface Alloys of 0.45 C Carbon Steel Produced by High Current Pulsed Electron Beam
  53. Deformation Behavior and Processing Map during Isothermal Hot Compression of 49MnVS3 Non-Quenched and Tempered Steel
  54. A Constitutive Equation for Predicting Elevated Temperature Flow Behavior of BFe10-1-2 Cupronickel Alloy through Double Multiple Nonlinear Regression
  55. Oxidation Behavior of Ferritic Steel T22 Exposed to Supercritical Water
  56. A Multi Scale Strategy for Simulation of Microstructural Evolutions in Friction Stir Welding of Duplex Titanium Alloy
  57. Partition Behavior of Alloying Elements in Nickel-Based Alloys and Their Activity Interaction Parameters and Infinite Dilution Activity Coefficients
  58. Influence of Heating on Tensile Physical-Mechanical Properties of Granite
  59. Comparison of Al-Zn-Mg Alloy P-MIG Welded Joints Filled with Different Wires
  60. Microstructure and Mechanical Properties of Thick Plate Friction Stir Welds for 6082-T6 Aluminum Alloy
  61. Research Article
  62. Kinetics of oxide scale growth on a (Ti, Mo)5Si3 based oxidation resistant Mo-Ti-Si alloy at 900-1300∘C
  63. Calorimetric study on Bi-Cu-Sn alloys
  64. Mineralogical Phase of Slag and Its Effect on Dephosphorization during Converter Steelmaking Using Slag-Remaining Technology
  65. Controllability of joint integrity and mechanical properties of friction stir welded 6061-T6 aluminum and AZ31B magnesium alloys based on stationary shoulder
  66. Cellular Automaton Modeling of Phase Transformation of U-Nb Alloys during Solidification and Consequent Cooling Process
  67. The effect of MgTiO3Adding on Inclusion Characteristics
  68. Cutting performance of a functionally graded cemented carbide tool prepared by microwave heating and nitriding sintering
  69. Creep behaviour and life assessment of a cast nickel – base superalloy MAR – M247
  70. Failure mechanism and acoustic emission signal characteristics of coatings under the condition of impact indentation
  71. Reducing Surface Cracks and Improving Cleanliness of H-Beam Blanks in Continuous Casting — Improving continuous casting of H-beam blanks
  72. Rhodium influence on the microstructure and oxidation behaviour of aluminide coatings deposited on pure nickel and nickel based superalloy
  73. The effect of Nb content on precipitates, microstructure and texture of grain oriented silicon steel
  74. Effect of Arc Power on the Wear and High-temperature Oxidation Resistances of Plasma-Sprayed Fe-based Amorphous Coatings
  75. Short Communication
  76. Novel Combined Feeding Approach to Produce Quality Al6061 Composites for Heat Sinks
  77. Research Article
  78. Micromorphology change and microstructure of Cu-P based amorphous filler during heating process
  79. Controlling residual stress and distortion of friction stir welding joint by external stationary shoulder
  80. Research on the ingot shrinkage in the electroslag remelting withdrawal process for 9Cr3Mo roller
  81. Production of Mo2NiB2 Based Hard Alloys by Self-Propagating High-Temperature Synthesis
  82. The Morphology Analysis of Plasma-Sprayed Cast Iron Splats at Different Substrate Temperatures via Fractal Dimension and Circularity Methods
  83. A Comparative Study on Johnson–Cook, Modified Johnson–Cook, Modified Zerilli–Armstrong and Arrhenius-Type Constitutive Models to Predict Hot Deformation Behavior of TA2
  84. Dynamic absorption efficiency of paracetamol powder in microwave drying
  85. Preparation and Properties of Blast Furnace Slag Glass Ceramics Containing Cr2O3
  86. Influence of unburned pulverized coal on gasification reaction of coke in blast furnace
  87. Effect of PWHT Conditions on Toughness and Creep Rupture Strength in Modified 9Cr-1Mo Steel Welds
  88. Role of B2O3 on structure and shear-thinning property in CaO–SiO2–Na2O-based mold fluxes
  89. Effect of Acid Slag Treatment on the Inclusions in GCr15 Bearing Steel
  90. Recovery of Iron and Zinc from Blast Furnace Dust Using Iron-Bath Reduction
  91. Phase Analysis and Microstructural Investigations of Ce2Zr2O7 for High-Temperature Coatings on Ni-Base Superalloy Substrates
  92. Combustion Characteristics and Kinetics Study of Pulverized Coal and Semi-Coke
  93. Mechanical and Electrochemical Characterization of Supersolidus Sintered Austenitic Stainless Steel (316 L)
  94. Synthesis and characterization of Cu doped chromium oxide (Cr2O3) thin films
  95. Ladle Nozzle Clogging during casting of Silicon-Steel
  96. Thermodynamics and Industrial Trial on Increasing the Carbon Content at the BOF Endpoint to Produce Ultra-Low Carbon IF Steel by BOF-RH-CSP Process
  97. Research Article
  98. Effect of Boundary Conditions on Residual Stresses and Distortion in 316 Stainless Steel Butt Welded Plate
  99. Numerical Analysis on Effect of Additional Gas Injection on Characteristics around Raceway in Melter Gasifier
  100. Variation on thermal damage rate of granite specimen with thermal cycle treatment
  101. Effects of Fluoride and Sulphate Mineralizers on the Properties of Reconstructed Steel Slag
  102. Effect of Basicity on Precipitation of Spinel Crystals in a CaO-SiO2-MgO-Cr2O3-FeO System
  103. Review Article
  104. Exploitation of Mold Flux for the Ti-bearing Welding Wire Steel ER80-G
  105. Research Article
  106. Furnace heat prediction and control model and its application to large blast furnace
  107. Effects of Different Solid Solution Temperatures on Microstructure and Mechanical Properties of the AA7075 Alloy After T6 Heat Treatment
  108. Study of the Viscosity of a La2O3-SiO2-FeO Slag System
  109. Tensile Deformation and Work Hardening Behaviour of AISI 431 Martensitic Stainless Steel at Elevated Temperatures
  110. The Effectiveness of Reinforcement and Processing on Mechanical Properties, Wear Behavior and Damping Response of Aluminum Matrix Composites
https://doi.org/10.1515/htmp-2019-0005
Keywords for this article
Friction stir welding; stationary shoulder; residual stress; synchronous rolling; distortion
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Articles in the same Issue

  1. Frontmatter
  2. Review Article
  3. Research on the Influence of Furnace Structure on Copper Cooling Stave Life
  4. Influence of High Temperature Oxidation on Hydrogen Absorption and Degradation of Zircaloy-2 and Zr 700 Alloys
  5. Correlation between Travel Speed, Microstructure, Mechanical Properties and Wear Characteristics of Ni-Based Hardfaced Deposits over 316LN Austenitic Stainless Steel
  6. Factors Influencing Gas Generation Behaviours of Lump Coal Used in COREX Gasifier
  7. Experiment Research on Pulverized Coal Combustion in the Tuyere of Oxygen Blast Furnace
  8. Phosphate Capacities of CaO–FeO–SiO2–Al2O3/Na2O/TiO2 Slags
  9. Microstructure and Interface Bonding Strength of WC-10Ni/NiCrBSi Composite Coating by Vacuum Brazing
  10. Refill Friction Stir Spot Welding of Dissimilar 6061/7075 Aluminum Alloy
  11. Solvothermal Synthesis and Magnetic Properties of Monodisperse Ni0.5Zn0.5Fe2O4 Hollow Nanospheres
  12. On the Capability of Logarithmic-Power Model for Prediction of Hot Deformation Behavior of Alloy 800H at High Strain Rates
  13. 3D Heat Conductivity Model of Mold Based on Node Temperature Inheritance
  14. 3D Microstructure and Micromechanical Properties of Minerals in Vanadium-Titanium Sinter
  15. Effect of Martensite Structure and Carbide Precipitates on Mechanical Properties of Cr-Mo Alloy Steel with Different Cooling Rate
  16. The Interaction between Erosion Particle and Gas Stream in High Temperature Gas Burner Rig for Thermal Barrier Coatings
  17. Permittivity Study of a CuCl Residue at 13–450 °C and Elucidation of the Microwave Intensification Mechanism for Its Dechlorination
  18. Study on Carbothermal Reduction of Titania in Molten Iron
  19. The Sequence of the Phase Growth during Diffusion in Ti-Based Systems
  20. Growth Kinetics of CoB–Co2B Layers Using the Powder-Pack Boriding Process Assisted by a Direct Current Field
  21. High-Temperature Flow Behaviour and Constitutive Equations for a TC17 Titanium Alloy
  22. Research on Three-Roll Screw Rolling Process for Ti6Al4V Titanium Alloy Bar
  23. Continuous Cooling Transformation of Undeformed and Deformed High Strength Crack-Arrest Steel Plates for Large Container Ships
  24. Formation Mechanism and Influence Factors of the Sticker between Solidified Shell and Mold in Continuous Casting of Steel
  25. Casting Defects in Transition Layer of Cu/Al Composite Castings Prepared Using Pouring Aluminum Method and Their Formation Mechanism
  26. Effect of Current on Segregation and Inclusions Characteristics of Dual Alloy Ingot Processed by Electroslag Remelting
  27. Investigation of Growth Kinetics of Fe2B Layers on AISI 1518 Steel by the Integral Method
  28. Microstructural Evolution and Phase Transformation on the X-Y Surface of Inconel 718 Ni-Based Alloys Fabricated by Selective Laser Melting under Different Heat Treatment
  29. Characterization of Mn-Doped Co3O4 Thin Films Prepared by Sol Gel-Based Dip-Coating Process
  30. Deposition Characteristics of Multitrack Overlayby Plasma Transferred Arc Welding on SS316Lwith Co-Cr Based Alloy – Influence ofProcess Parameters
  31. Elastic Moduli and Elastic Constants of Alloy AuCuSi With FCC Structure Under Pressure
  32. Effect of Cl on Softening and Melting Behaviors of BF Burden
  33. Effect of MgO Injection on Smelting in a Blast Furnace
  34. Structural Characteristics and Hydration Kinetics of Oxidized Steel Slag in a CaO-FeO-SiO2-MgO System
  35. Optimization of Microwave-Assisted Oxidation Roasting of Oxide–Sulphide Zinc Ore with Addition of Manganese Dioxide Using Response Surface Methodology
  36. Hydraulic Study of Bubble Migration in Liquid Titanium Alloy Melt during Vertical Centrifugal Casting Process
  37. Investigation on Double Wire Metal Inert Gas Welding of A7N01-T4 Aluminum Alloy in High-Speed Welding
  38. Oxidation Behaviour of Welded ASTM-SA210 GrA1 Boiler Tube Steels under Cyclic Conditions at 900°C in Air
  39. Study on the Evolution of Damage Degradation at Different Temperatures and Strain Rates for Ti-6Al-4V Alloy
  40. Pack-Boriding of Pure Iron with Powder Mixtures Containing ZrB2
  41. Evolution of Interfacial Features of MnO-SiO2 Type Inclusions/Steel Matrix during Isothermal Heating at Low Temperatures
  42. Effect of MgO/Al2O3 Ratio on Viscosity of Blast Furnace Primary Slag
  43. The Microstructure and Property of the Heat Affected zone in C-Mn Steel Treated by Rare Earth
  44. Microwave-Assisted Molten-Salt Facile Synthesis of Chromium Carbide (Cr3C2) Coatings on the Diamond Particles
  45. Effects of B on the Hot Ductility of Fe-36Ni Invar Alloy
  46. Impurity Distribution after Solidification of Hypereutectic Al-Si Melts and Eutectic Al-Si Melt
  47. Induced Electro-Deposition of High Melting-Point Phases on MgO–C Refractory in CaO–Al2O3–SiO2 – (MgO) Slag at 1773 K
  48. Microstructure and Mechanical Properties of 14Cr-ODS Steels with Zr Addition
  49. A Review of Boron-Rich Silicon Borides Basedon Thermodynamic Stability and Transport Properties of High-Temperature Thermoelectric Materials
  50. Siliceous Manganese Ore from Eastern India:A Potential Resource for Ferrosilicon-Manganese Production
  51. A Strain-Compensated Constitutive Model for Describing the Hot Compressive Deformation Behaviors of an Aged Inconel 718 Superalloy
  52. Surface Alloys of 0.45 C Carbon Steel Produced by High Current Pulsed Electron Beam
  53. Deformation Behavior and Processing Map during Isothermal Hot Compression of 49MnVS3 Non-Quenched and Tempered Steel
  54. A Constitutive Equation for Predicting Elevated Temperature Flow Behavior of BFe10-1-2 Cupronickel Alloy through Double Multiple Nonlinear Regression
  55. Oxidation Behavior of Ferritic Steel T22 Exposed to Supercritical Water
  56. A Multi Scale Strategy for Simulation of Microstructural Evolutions in Friction Stir Welding of Duplex Titanium Alloy
  57. Partition Behavior of Alloying Elements in Nickel-Based Alloys and Their Activity Interaction Parameters and Infinite Dilution Activity Coefficients
  58. Influence of Heating on Tensile Physical-Mechanical Properties of Granite
  59. Comparison of Al-Zn-Mg Alloy P-MIG Welded Joints Filled with Different Wires
  60. Microstructure and Mechanical Properties of Thick Plate Friction Stir Welds for 6082-T6 Aluminum Alloy
  61. Research Article
  62. Kinetics of oxide scale growth on a (Ti, Mo)5Si3 based oxidation resistant Mo-Ti-Si alloy at 900-1300∘C
  63. Calorimetric study on Bi-Cu-Sn alloys
  64. Mineralogical Phase of Slag and Its Effect on Dephosphorization during Converter Steelmaking Using Slag-Remaining Technology
  65. Controllability of joint integrity and mechanical properties of friction stir welded 6061-T6 aluminum and AZ31B magnesium alloys based on stationary shoulder
  66. Cellular Automaton Modeling of Phase Transformation of U-Nb Alloys during Solidification and Consequent Cooling Process
  67. The effect of MgTiO3Adding on Inclusion Characteristics
  68. Cutting performance of a functionally graded cemented carbide tool prepared by microwave heating and nitriding sintering
  69. Creep behaviour and life assessment of a cast nickel – base superalloy MAR – M247
  70. Failure mechanism and acoustic emission signal characteristics of coatings under the condition of impact indentation
  71. Reducing Surface Cracks and Improving Cleanliness of H-Beam Blanks in Continuous Casting — Improving continuous casting of H-beam blanks
  72. Rhodium influence on the microstructure and oxidation behaviour of aluminide coatings deposited on pure nickel and nickel based superalloy
  73. The effect of Nb content on precipitates, microstructure and texture of grain oriented silicon steel
  74. Effect of Arc Power on the Wear and High-temperature Oxidation Resistances of Plasma-Sprayed Fe-based Amorphous Coatings
  75. Short Communication
  76. Novel Combined Feeding Approach to Produce Quality Al6061 Composites for Heat Sinks
  77. Research Article
  78. Micromorphology change and microstructure of Cu-P based amorphous filler during heating process
  79. Controlling residual stress and distortion of friction stir welding joint by external stationary shoulder
  80. Research on the ingot shrinkage in the electroslag remelting withdrawal process for 9Cr3Mo roller
  81. Production of Mo2NiB2 Based Hard Alloys by Self-Propagating High-Temperature Synthesis
  82. The Morphology Analysis of Plasma-Sprayed Cast Iron Splats at Different Substrate Temperatures via Fractal Dimension and Circularity Methods
  83. A Comparative Study on Johnson–Cook, Modified Johnson–Cook, Modified Zerilli–Armstrong and Arrhenius-Type Constitutive Models to Predict Hot Deformation Behavior of TA2
  84. Dynamic absorption efficiency of paracetamol powder in microwave drying
  85. Preparation and Properties of Blast Furnace Slag Glass Ceramics Containing Cr2O3
  86. Influence of unburned pulverized coal on gasification reaction of coke in blast furnace
  87. Effect of PWHT Conditions on Toughness and Creep Rupture Strength in Modified 9Cr-1Mo Steel Welds
  88. Role of B2O3 on structure and shear-thinning property in CaO–SiO2–Na2O-based mold fluxes
  89. Effect of Acid Slag Treatment on the Inclusions in GCr15 Bearing Steel
  90. Recovery of Iron and Zinc from Blast Furnace Dust Using Iron-Bath Reduction
  91. Phase Analysis and Microstructural Investigations of Ce2Zr2O7 for High-Temperature Coatings on Ni-Base Superalloy Substrates
  92. Combustion Characteristics and Kinetics Study of Pulverized Coal and Semi-Coke
  93. Mechanical and Electrochemical Characterization of Supersolidus Sintered Austenitic Stainless Steel (316 L)
  94. Synthesis and characterization of Cu doped chromium oxide (Cr2O3) thin films
  95. Ladle Nozzle Clogging during casting of Silicon-Steel
  96. Thermodynamics and Industrial Trial on Increasing the Carbon Content at the BOF Endpoint to Produce Ultra-Low Carbon IF Steel by BOF-RH-CSP Process
  97. Research Article
  98. Effect of Boundary Conditions on Residual Stresses and Distortion in 316 Stainless Steel Butt Welded Plate
  99. Numerical Analysis on Effect of Additional Gas Injection on Characteristics around Raceway in Melter Gasifier
  100. Variation on thermal damage rate of granite specimen with thermal cycle treatment
  101. Effects of Fluoride and Sulphate Mineralizers on the Properties of Reconstructed Steel Slag
  102. Effect of Basicity on Precipitation of Spinel Crystals in a CaO-SiO2-MgO-Cr2O3-FeO System
  103. Review Article
  104. Exploitation of Mold Flux for the Ti-bearing Welding Wire Steel ER80-G
  105. Research Article
  106. Furnace heat prediction and control model and its application to large blast furnace
  107. Effects of Different Solid Solution Temperatures on Microstructure and Mechanical Properties of the AA7075 Alloy After T6 Heat Treatment
  108. Study of the Viscosity of a La2O3-SiO2-FeO Slag System
  109. Tensile Deformation and Work Hardening Behaviour of AISI 431 Martensitic Stainless Steel at Elevated Temperatures
  110. The Effectiveness of Reinforcement and Processing on Mechanical Properties, Wear Behavior and Damping Response of Aluminum Matrix Composites
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