Abstract
The transformation behavior and tensile properties of an ultra-high-strength transformation-induced plasticity (TRIP) steel (0.2C-2.0Si-1.8Mn) were investigated by different heat treatments for automobile applications. The results show that F-TRIP steel, a traditional TRIP steel containing as-cold-rolled ferrite and pearlite as the original microstructure, consists of equiaxed grains of intercritical ferrite surrounded by discrete particles of M/RA and B. In contrast, M-TRIP steel, a modified TRIP-aided steel with martensite as the original microstructure, containing full martensite as the original microstructure is comprised of lath-shaped grains of ferrite separated by lath-shaped martensite/retained austenite and bainite. Most of the austenite in F-TRIP steel is granular, while the austenite in M-TRIP steel is lath-shaped. The volume fraction of the retained austenite as well as its carbon content is lower in F-TRIP steel than in M-TRIP steel, and austenite grains in M-TRIP steel are much finer than those in F-TRIP steel. Therefore, M-TRIP steel was concluded to have a higher austenite stability, resulting in a lower transformation rate and consequently contributing to a higher elongation compared to F-TRIP steel. Work hardening behavior is also discussed for both types of steel.
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V.F. Zackay, E.R. Parker, D. Fahr, and R. Busch, The enhancement of ductility on high-strength steels, Trans. ASM, 60(1967), No. 2, p. 252.
E.V. Pereloma, I.B. Timokhina, and P.D. Hodgson, Microstructure and mechanical properties of thermomechanically processed C-Si-Mn steels, Ironmaking Steelmaking, 28(2001), No. 2 p. 198.
H.B. Ryu, J.G. Speer, and J.P. Wise, Effect of thermomechanical processing on the retained austenite content in a Si-Mn transformation-induced-plasticity steel. Metall. Mater. Trans. A, 33(2002), No. 9, p. 2811.
E. Jimenez-Melero, N.H. van Dijk, L. Zhao, J. Sietsma, S.E. Offerman, J.P. Wright, and S. van der Zwaag, Characterization of individual retained austenite grains and their stability in low-alloyed TRIP steels, Acta Mater., 55(2007), No. 20, p. 6713.
R. Zhu, S. Li, I. Karaman, R. Arroyave, T. Niendorf, and H.J. Maier, Multi-phase microstructure design of a low-alloy TRIP-assisted steel through a combined computational and experimental methodology, Acta Mater., 60(2012), No. 6–7, p. 3022.
B.S. Seong, E.J. Shin, Y.S. Han. C.H. Lee, Y.J. Kima, and S.J. Kim, Effect of retained austenite and solute carbon on the mechanical properties in TRIP steels, Phys. B, 350(2004), No. 1–3, p. E467.
X.D. Wang, B.X. Huang, Y.H. Rong, and L. Wang, Microstructures and stability of retained austenite in TRIP steels, Mater. Sci. Eng. A, 438–440(2006), p. 300.
R. Blondé, E. Jimenez-Melero, L. Zhao, N. Schell, E. Brück, S. van der Zwaag, and N.H. van Dijk, The mechanical stability of retained austenite in low-alloyed TRIP steel under shear loading, Mater. Sci. Eng. A, 594(2014), p. 125.
J. Zrník, O. Muránsky, P. Lukáš, Z. Nový, P. Sittner, and P. Horňak, Retained austenite stability investigation in TRIP steel using neutron diffraction, Mater. Sci. Eng. A, 437(2006), No. 1, p. 114.
R. Blondé, E. Jimenez-Melero, L. Zhao, J.P. Wright, E. Brück, S. van der Zwaag, and N.H. van Dijk, High-energy X-ray diffraction study on the temperature-dependent mechanical stability of retained austenite in low-alloyed TRIP steels, Acta Mater., 60(2012), No. 2, p. 565.
J. Chiang, B. Lawrence, J.D. Boyd, and A.K. Pilkey, Effect of microstructure on retained austenite stability and work hardening of TRIP steels, Mater. Sci. Eng. A, 528(2011), No. 13–14, p. 4516.
Y.F. Shen, Y.D. Liu, X. Sun, Y.D. Wang, L. Zuo, and R.D.K. Misra, Improved ductility of a transformation-induced-plasticity steel by nanoscale austenite lamellae, Mater. Sci. Eng. A, 583(2013), p. 1.
S. Zhang and K.O. Findley, Quantitative assessment of the effects of microstructure on the stability of retained austenite in TRIP steels, Acta Mater., 61(2013), No. 6. p. 1895.
K. Sugimoto, D. Fiji, and N. Yoshikawa, Fatigue strength of newly developed high-strength low alloy TRIP-aided steels with good hardenability, Procedia Eng., 2(2010), No. 1, p. 359.
K. Sugimoto, A. Kanda, R. Kikuchi, S. Hashimoto, T. Kashima, and S. Ikeda, Ductility and formability of newly developed high strength low alloy TRIP-aided sheet steels with annealed martensite matrix, ISIJ Int., 42(2002), No. 8, p. 910.
F.G. Caballero, S. Allain, J. Cornide, J.D. Puerta Velásquez, C. Garcia-Mateo, and M.K. Miller, Design of cold rolled and continuous annealed carbide-free bainitic steels, Mater. Des., 49(2013), p. 667.
H. Maruyama, X-ray measurement of retained austenite volume fraction, J. Jpn. Soc. Heat Treat., (1977), No. 17, p. 198.
D.J. Dyson and B. Holmes, Effect of alloying additions on the lattice parameter of austenite, J. Iron Steel Inst., 208(1970), p. 469.
S.G. Wang, X. Wang, L.X. Hua, Z.W. Liu, and H.L. Zhou, Relationship between retained austenite and strain for Si-Mn TRIP steel. J. Univ. Sci. Technol. Beijing, 2(1995), No. 1, p.
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Yin, Hx., Zhao, Am., Zhao, Zz. et al. Influence of original microstructure on the transformation behavior and mechanical properties of ultra-high-strength TRIP-aided steel. Int J Miner Metall Mater 22, 262–271 (2015). https://doi.org/10.1007/s12613-015-1070-6
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DOI: https://doi.org/10.1007/s12613-015-1070-6