Effect of Deformation Temperature on Stability of Austenite in Fe-11Mn-4Al-0.2C Steel

doi:10.12068/j.issn.1005-3026.2016.07.009

Abstract

Abstract: The cold-rolled 11 wt% Mn steel was investigated in this work. The microstructure and mechanical properties of the samples tensioned at different temperatures were studied to investigate the effect of deformation temperature on the stability of austenite in the steel. The temperature of M^σ_s was finally determined in the range of 20~25℃. The results showed that the stability of austenite increased with increase of the temperature during straining，leading to decrease of the strain hardening ability. When the samples were tensioned at the temperature around M^σ_s， both of the stress-induced and strain-induced martensitic transformation were found. Therefore， the best combination of strength and ductility was obtained， which mainly contributed by TRIP effect. The average grain size in the austenite was calculated in the range of 0.70~0.71μm by a theoretical model.

Key words: M^σ_s, austenite stability, microstructure, mechanical properties, strain hardening behaviour

CLC Number:

TG335.58

CAI Zhi-hui，DING Hua，YING Zheng-yan. Effect of Deformation Temperature on Stability of Austenite in Fe-11Mn-4Al-0.2C Steel[J]. Journal of Northeastern University Natural Science, 2016, 37(7): 951-955.

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