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Acta Metall Sin  2010, Vol. 46 Issue (10): 1230-1236    DOI: 10.3724/SP.J.1037.2010.00304
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ZHANG Weina, LIU Zhengyu, WANG Guodong
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819
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Abstract  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 so–called 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.
Key words:  high manganese steel      TRIP effect      autenite      martensitic transformation      strain hardening behavior     
Received:  28 June 2010     

Supported by National Natural Science Foundation of China (No.50873141)

Corresponding Authors:  LIU Zhengyu     E-mail:

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