Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Regular Article
TWIP Effect and Plastic Instability Condition in an Fe-Mn-C Austenitic Steel
Motomichi KoyamaTakahiro SawaguchiKaneaki Tsuzaki
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2012 Volume 98 Issue 6 Pages 229-236

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Abstract

The correlation among deformation twin density, work hardening, and tensile ductility was investigated in an Fe-18Mn-1.2C steel. The twin density was varied by changing tensile deformation temperature from 123 to 523 K. The deformation twin density at a 10% plastic strain decreased with increasing deformation temperature except for the condition (123K) in which martensitic transformation occurred. The work hardening rate at the early deformation stage decreased due to the reduction in the deformation twin density; however, the decrease in work hardening rate did not affect the uniform elongation. The uniform elongation was determined by a plastic instability condition. Thus, the important factor for the uniform elongation is the work hardening rate in the later deformation stage. Additionally, we discussed influences of dynamic strain aging and ε-martensitic transformation which accelerated fracture.

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© 2012 The Iron and Steel Institute of Japan
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