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Effect of Chemical Composition on the Microstructure and Tensile Property in TRIP-assisted Multiphase Steels  

Lee, K.Y. (Division of Automotive and Mechanical Eng., Nambu University)
Jang, W.Y. (Dept. of Metallurgical Eng., Chosun University)
Kang, J.W. (Dept. of Metallurgical Eng., Chosun University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.16, no.3, 2003 , pp. 127-133 More about this Journal
Abstract
The effect of chemical composition on the microstructural change and tensile property in TRIP-assisted steels with different chemical composition was investigated by using SEM, TEM, XRD and UTM. As a result of microscopic observation, the morphology of retained austenite could be identified as two types; a granular type in a steel containing higher Si and a film type in a steel having higher C. For the case of higher C-containing steel with a tensile strength of 860 MPa and a total elongation of 38%, film-typed retained austenite could be observed between lath bainitic ferrite. Actually, metastable retained austenite was a requisite for the good formability, which means that chemical composition plays a significant role in the microstructure and tensile property of TRIP-assisted steels. With respect to tensile property, the steels containing suitable Si and Mn, respectively, showed a typical TRIP effect in stress-strain curve, while a steel containing higher Mn content exhibited the similar behavior shown in dual phase steel.
Keywords
TRIP-assited steel; Microstructural change; Tensile property; Chemical composition; Metastable retained austenite;
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  • Reference
1 V. F. Zackay, E. R. Parker, D. Fahr and R. Busch : Trans. ASM 60 (1967) 252
2 Y. Sakuma, O. Matsumura and H. Takechi : Met. Trans. 22A (1991) 489
3 G. Krauss : Steels, ASM International., OH, USA (1989) 78
4 O. Matsumura , Y. Sakuma and H. Takechi : Trans ISIJ 27 (1987) 570
5 S. K. Liu and J. Zhang : Met. Trans. 21A (1990) 1517
6 P. Jacques, E. Girault, J. van Humbeeck, E. Aernoudt and F. Delannay : Journal de Physique IV (1997) 459
7 H. C. Chen, H. Era and M. Shimizu : Met. Trans. 20A (1989) 437
8 I. Tsukatani, S. Hashimoto and T. Inoue : ISIJ 31 (1991) 992
9 H. K. D. H. Bhadeshia and D. V. Edmonds : Acta Metall. 28 (1980) 1265