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Acta Metall Sin  2012, Vol. 48 Issue (9): 1067-1073    DOI: 10.3724/SP.J.1037.2012.00094
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EFFECT OF VC PARTICLES ON THE STRAIN HARDENING BEHAVIOR OF TWIP STEEL
ZHANG Zhibo, LIU Zhenyu, ZHANG Weina
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819
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Abstract  The twinning induced plasticity (TWIP) steel has received more and more attention for its outstanding combination of good strength and high ductile. It has been proposed that deformation twinning plays an important role in controlling the deformation behavior. The formation of deformation twins is influenced by deformation temperature, strain rate, pre-deformation, grain size and precipitates. The generation of deformation twins in austenitic steel is closely related to precipitates. However, the relationship between strain hardening rate and precipitates in TWIP steels has not been clarified. In this work, the effect of vanadium carbides on the microstructure, strain hardening behavior and mechanical properties of Fe-Mn-C TWIP steel was investigated. The specimens of Fe22Mn0.6C and Fe22Mn0.6C0.19V TWIP steels with similar grain sizes were fabricated through solution treatments at different temperatures. Mechanical properties were measured by tensile tests, and microstructure evolution was observed by EBSD and TEM. The strain hardening rate (dσ/dε)-true strain (ε) curves of two steels were drawn. The results show that for the Fe22Mn0.6C0.19V steel, the strain hardening rate platform appear when true strain ε>0.14, while the strain hardening rate platform appear when the ε>0.12 for the Fe22Mn0.6C steel. The platform of Fe22Mn0.6C steel is significantly longer than that of Fe22Mn0.6C0.19V steel, The platform of Fe22Mn0.6C0.19V steel disappear quickly as true strain ε>0.21. Tensile specimens of Fe22Mn0.6C and Fe22Mn0.6C0.19V steels were observed by TEM, the results show that both the generation and propagation of deformation twins are inhibited significantly by vanadium carbides.
Key words:  TWIP steel      strain hardening rate      vanadium carbides      deformation twins     
Received:  24 February 2012     
ZTFLH: 

TG115.213

 
Fund: 

Supported by National Natural Science Foundation of China (No.50873141) and the Fundamental Research Funds for the Central Universities (No.N100507002)

Cite this article: 

ZHANG Zhibo LIU Zhenyu ZHANG Weina. EFFECT OF VC PARTICLES ON THE STRAIN HARDENING BEHAVIOR OF TWIP STEEL. Acta Metall Sin, 2012, 48(9): 1067-1073.

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00094     OR     https://www.ams.org.cn/EN/Y2012/V48/I9/1067

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