Transient microstructure after large deformation at two-phase region of ultra-fine grained austenite

Chin J Mater Res

2008, Vol. 22

Issue (6): 572-576 DOI:

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Transient microstructure after large deformation at two-phase region of ultra-fine grained austenite

YAO shengjie; DU Linxiu^†; LIU Xianghua; WANG Guodong

State Key Laboratory of Rolling and Automation; Northeastern University; Shenyang 110004

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YAO shengjie; DU Linxiu; LIU Xianghua; WANG Guodong. Transient microstructure after large deformation at two-phase region of ultra-fine grained austenite. Chin J Mater Res, 2008, 22(6): 572-576.

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Abstract

Ultra-fine austenite was obtained by repetitive treatment of reheating and quenching of a low carbon steel. Large deformation with true strain (ε=2) was applied when the samples was undercooled to relatively lower temperatures in two-phase region with a cooling rate of 20℃/s, and the results showed that: a work-hardening behavior continuously presented during the after-deforming, while an extent of softening mechanisms, such as deformaiton induced tranforamation (DIF) or recrystallizaiton of ferrtie also existed simutaneously; strain-induced twin martensite formed at some separate locations with over-saturated carbon concentration, and the amount of twin martensite increased with decreasing of deformation temperatrue. The stress-strain behaviors and transient microstructure after deformation were more or less affected the distribution of carbon concentration in the ultra-fine grained austeite which was greatly dependent on the starting microstructre.

Key words: metallic materials rolling ultra-fine grained austenite large deformation in two-phase region twin martensite

Received: 28 January 2008

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2008/V22/I6/572

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