Tensile Properties and Fracture of Ferritic SG-Iron Having Different Graphite-Shell Structure
Abstract
A variety of graphite shell structures is developed in a ferritic spheroidal graphite (SG) iron. The graphite shell is obtained by rapidly heating to a temperature of about 1183 K, and then quenching into iced water or salt bath held at 633 K. These heat treatments developed a graphite shell of martensite and ausferrite, respectively. The SG-iron with martensitic graphite shell is superior in strength to that of a fully ferritic matrix. However, the elongation of the former is decreased by an amount of about 76% compared with that of the latter. In contrast developing an ausferrite graphite shell in a ferritic SG-iron leads to an improvement of about 15 and 31% in the 0.2% yield stress and the ultimate tensile strength, respectively, with no deleterious effect on the elongation. SG-iron having an ausferrite graphite shell fails in a ductile fashion. Introducing a graphite shell of martensite changed the ductile nature of the ferrite phase to a typical brittle fracture.
-
The author wish to acknowledge the assistance of Prof. S. Mustafa in the SEM study as well as the useful discussion with Prof. M. Hammouda. The author is also indebted to El-Nasr Company for Castings, Giza, Egypt, who provided the SG-iron cast ingots. The help of Eng. M. Sobhy in the experimental work is very much appreciated.
References
1 Liu, S.C.; Lui, T.S.; Chon, L.E.: AFS Trans. 105 (1997) 753.Suche in Google Scholar
2 Hwang, J., Doong, J.; Chen, H.: J. Mater. Sci. Lett. 2 (1983) 737.10.1007/BF00720546Suche in Google Scholar
3 Hafiz, M.: J. Mater. Sci. 36 (2001) 1293.10.1023/A:1004866817049Suche in Google Scholar
4 Hafiz, M.: J. Mater. Sci., submitted.Suche in Google Scholar
5 Bayati, H.; Elliott, R.: Mater. Sci. Technol. 15 (1999) 265.10.1179/026708399101505833Suche in Google Scholar
6 Komatsu, S.; Shiota, T.; Matsuoka, T.; Nakamura, K.: AFS Trans. 102 (1994) 121.Suche in Google Scholar
7 Hughes, I.C.H.: Mater. Design 6 (1985) 124.10.1016/0261-3069(85)90055-XSuche in Google Scholar
8 Grech, M.; Browen, P.; Young, J.M.: Trans. 3rd ADI Conf. Chicago 2 (1991) 338.Suche in Google Scholar
9 Shih, T.S.; Lin, C.K.; Twan, H.Z.: AFS Trans. 105 (1997) 367.Suche in Google Scholar
10 Forrest, R.D.: Foundryman, 8 (1988) 168.Suche in Google Scholar
11 Okabayashi, K.; Kawamoto, M.; Ikenoga, A.; Tsujikawa, M.: Trans. JFS 1 (1982) 37.Suche in Google Scholar
12 Karsay, S.: Ductile Iron – the Production Practices, American Foundrymen’s Society for Metals, USA (1979).Suche in Google Scholar
13 ASM, Metals Handbook- Metallography and Microstructures, American Society of Metals, Metals Park, OH (1985) 9.Suche in Google Scholar
© 2001 Carl Hanser Verlag, München
Artikel in diesem Heft
- Frontmatter
- Aufsätze/Articles
- On the Formation of a Silver-Rich Ordered Phase in Ag–Pt Solid Solutions
- Solid State Reactions in Transition Metal Diboride-Based Materials
- Anisotropy in Thermal Transport Properties of Cast γ-TiAl Alloys
- Local Orientation Changes and Shear Banding in {112} 〈111〉-Oriented Aluminium Single Crystals
- Cyclic Saturation Dislocation Structures of Multiple-Slip-Oriented Copper Single Crystals
- The Ultra-High Rate Superplastic Forming of a Zn–22Al Thin Sheet Material
- Einfluss der Umformgeschwindigkeit und -temperatur auf das Fließverhalten der Magnesiumlegierung AZ80
- Thermodynamic Evaluation of Nano-Particle Binary Alloy Phase Diagrams
- Measurement of Surface Tension of Liquid Ga-Base Alloys by a Sessile Drop Method
- Structure Changes and Precipitation Kinetics in Melt Spun and Aged Al–Li–Cu Alloy
- TEM Analyses of Heterogeneous Nucleation of Internally Oxidised Multi-Component Ag–Zn-Based Alloys
- Tensile Properties and Fracture of Ferritic SG-Iron Having Different Graphite-Shell Structure
- The Effect of Crystallographic Structure of Pure Metals on the Relation between their Specific Heat Content between Room Temperature and the Melting Point and the Magnitude of Some Mechanical Properties
- Mitteilungen/Notifications
- Personen
- Bücher/Books
- International Conferences
Artikel in diesem Heft
- Frontmatter
- Aufsätze/Articles
- On the Formation of a Silver-Rich Ordered Phase in Ag–Pt Solid Solutions
- Solid State Reactions in Transition Metal Diboride-Based Materials
- Anisotropy in Thermal Transport Properties of Cast γ-TiAl Alloys
- Local Orientation Changes and Shear Banding in {112} 〈111〉-Oriented Aluminium Single Crystals
- Cyclic Saturation Dislocation Structures of Multiple-Slip-Oriented Copper Single Crystals
- The Ultra-High Rate Superplastic Forming of a Zn–22Al Thin Sheet Material
- Einfluss der Umformgeschwindigkeit und -temperatur auf das Fließverhalten der Magnesiumlegierung AZ80
- Thermodynamic Evaluation of Nano-Particle Binary Alloy Phase Diagrams
- Measurement of Surface Tension of Liquid Ga-Base Alloys by a Sessile Drop Method
- Structure Changes and Precipitation Kinetics in Melt Spun and Aged Al–Li–Cu Alloy
- TEM Analyses of Heterogeneous Nucleation of Internally Oxidised Multi-Component Ag–Zn-Based Alloys
- Tensile Properties and Fracture of Ferritic SG-Iron Having Different Graphite-Shell Structure
- The Effect of Crystallographic Structure of Pure Metals on the Relation between their Specific Heat Content between Room Temperature and the Melting Point and the Magnitude of Some Mechanical Properties
- Mitteilungen/Notifications
- Personen
- Bücher/Books
- International Conferences
