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In Situ Observation of the Evolution of Intragranular Acicular Ferrite at Mg-containing Inclusions in 16Mn Steel

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Published/Copyright: April 18, 2013
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Journal for Manufacturing Science & Production
From the journal Journal for Manufacturing Science & Production Volume 13 Issue 1-2

Abstract

The effects of chemical compositions and austenitizing temperature on the formation of intragranular acicular ferrite (IAF) of 16Mn steel, a grade of low alloying steel with carbon content of 0.13∼0.19% and manganese content of 1.20∼1.60%, were systematically investigated. The in situ observation of the evolution of IAF at Mg-containing inclusions was carried out using a high-temperature laser scanning confocal microscopy (LSCM). The nucleation and growth of ferrites, the formation of IAF induced by inclusions, and the size of austenite grain at 1200 °C was directly observed using the LSCM. The results show that the inclusions can be transformed into MgAl2O4, Mg2SiO4 and MgO after treated by Mg. Trace amount of Mg can induce the IAF nucleation. With the increasing of Mg addition, the percentage of IAF in steel greatly increases, while the optimum content of Mg is around 0.0022 wt%. The appropriate austenitizing temperature is around 1200 °C and the optimal prior austenite grain size is about 130 µm. The temperature range for IAF transformation is around between 571 °C and 627 °C, and the time for which is about 12 s. The disregistries between MgAl2O4, MgO and α-Fe are as small as 0.6% and 4.03%, they are so small that may act as highly effective nuclei of IAF during γ → α transformation.

Keywords: magnesium; inclusions; intragranular acicular ferrite; lattice disregistry
State Key Laboratory of Advanced Metallurgy, and Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China
Received: 2012-08-05
Accepted: 2012-12-23
Published Online: 2013-04-18
Published in Print: 2013-04-17

©[2013] by Walter de Gruyter Berlin Boston

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  10. In Situ Observation of the Evolution of Intragranular Acicular Ferrite at Mg-containing Inclusions in 16Mn Steel
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  12. Freeze-lining Formation and Microstructure in a Direct-to-blister Flash Smelting Slag
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  14. Solidification Behaviour of Slags: The Single Hot Thermocouple Technique
  15. Investigation of Continuous Casting Slag Films Sampled on Site and Comparison with Laboratory Results
  16. Thermal Conductivity of R-Na2O-SiO2 (R = Al2O3, CaO) Melts
  17. Investigation of Blowing High Silicon Hot Metal by Double Slag Process
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https://doi.org/10.1515/jmsp-2012-0028
Keywords for this article
magnesium; inclusions; intragranular acicular ferrite; lattice disregistry

Articles in the same Issue

  1. Masthead
  2. Effect of Some Lubricants on the Flow Characteristics of ‘EPDM’ Rubber Under Compressive Load
  3. Friction Stir Welds of AA6351-T6 and AA2024-T6 Dissimiler Aluminium Alloys
  4. Effect of Welding Parameters on Pitting Corrosion Rate in 3.5N NaCl of Pulsed Current Micro Plasma Arc Welded AISI 304L Sheets
  5. An Investigation of Flank Wear Land Inclination in Orthogonal Machining
  6. Modeling of Radial Over Cut in Electrochemical Machining of Al-B4C MMC Using Response Surface Methodology
  7. Fundamental Research on a Rational Steelmaking Slag Recycling System by Phosphorus Separation and Collection
  8. KTH Steel Scrap Model – Iron and Steel Flow in the Swedish Society 1889–2010
  9. Direct Electrochemical Reduction of Titanium-Bearing Compounds to Titanium-Silicon Alloys in Molten Calcium Chloride
  10. In Situ Observation of the Evolution of Intragranular Acicular Ferrite at Mg-containing Inclusions in 16Mn Steel
  11. The Physical Properties of Slags for Electro-slag Remelting in CaF2-CaO-Al2O3-SiO2 System
  12. Freeze-lining Formation and Microstructure in a Direct-to-blister Flash Smelting Slag
  13. The Mechanism of Dross Formation during Hot-dip Al-Zn Alloy Coating Process
  14. Solidification Behaviour of Slags: The Single Hot Thermocouple Technique
  15. Investigation of Continuous Casting Slag Films Sampled on Site and Comparison with Laboratory Results
  16. Thermal Conductivity of R-Na2O-SiO2 (R = Al2O3, CaO) Melts
  17. Investigation of Blowing High Silicon Hot Metal by Double Slag Process
  18. An Investigation of Electro-deoxidation Process for Producing Titanium from Dense Titanium Dioxide Cathode
  19. Interaction between Molten Steel, Alumina Lining Refractory and Slag Phase
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