Martensitic transformation induced by deformation and work-hardening behavior of high manganese trip steels

被引：0
|
作者：
Zhang W. [1 ]
Liu Z. [1 ]
Wang G. [1 ]
机构：
[1] State Key Laboratory of Rolling and Automation, Northeastern University
来源：
Jinshu Xuebao/Acta Metallurgica Sinica | 2010年 / 46卷 / 10期
关键词：
Autenite; High manganese steel; Martensitic transformation; Strain hardening behavior; TRIP effect;
D O I：
10.3724/sp.j.1037.2010.01230
中图分类号：
学科分类号：
摘要：
High manganese steels containing 15%-30% (mass fractions) Mn and additions of (2%-4%)Si and (2%-4%)Al exhibit superior ductility and extraordinary strengthening behavior during plastic deformation, due to extensive twin formation under mechanical load (the so-called TWIP effect-twinning induced plasticity effect) or the ε-martensite and α'-martensite transformation (the socalled TRIP effect-transformation induced plasticity effect). In this paper, different heat treatments were carried out for high-manganese TRIP steels of Fe-15Mn-4Si-2Al and Fe-20Mn-4Si-2Al, and the uniaxial tensile tests were performed. The results show that increase of holding time at 1373 K can increase elongation and strength. Through the analysis of stress-strain curves, the relationship between mechanical properties and deformation mechanism was established. The dependence of phase compositions in high manganese TRIP steels on the heat treatment parameters has been studied by metallographic characterization and XRD pattern. The transformation routes of γ → ε → α' and γ → α' were observed by TEM, which dominates the TRIP effects. Microstructural characterization of ε-martensite and α'-martensite indicated that α'-martensite held the K-S orientation relationship with austenite, and the S-N (Shoji-Nishiyama) orientation relationship was observed between austenite and ε-martensite, whereas ε-martensite and α'-martensite held the Burgers orientation relationship. Deformation behavior of the two kinds of high Mn steels has been clarified through the relationship between work hardening rate of dσ/dε and true strain based on the true stress-true stain curves. It has been found that continuous transformation from austenite or ε-martensite to α'-martensite can take place during deformation, which increases the work-hardening rate to improve the TRIP effect. © Copyright.
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页码：1230 / 1236
页数：6
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