Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
Mechanical Properties
Overview of Dynamic Strain Aging and Associated Phenomena in Fe-Mn-C Austenitic Steels
Motomichi KoyamaTakahiro SawaguchiKaneaki Tsuzaki
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2018 Volume 104 Issue 4 Pages 187-200

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Abstract

This paper presents an overview of the recent works on dynamic strain aging (DSA) of Fe-Mn-C austenitic steels including Hadfield and twinning-induced plasticity (TWIP) steels. First, a model of the DSA mechanism and its controlling factors are briefly explained in terms of Mn-C coupling and dislocation separation. Then, we introduce the effects of DSA on mechanical properties such as work hardening capability, uniform elongation, post-uniform elongation, and fatigue strength. Specifically, we note the pinning effect on extended dislocation for the work hardening, the Poretvin-Le Chatelier banding effect on damage evolution for the elongation, and the crack tip hardening/softening effect on crack resistance for the fatigue strength. We believe that this overview will help in designing advanced high-strength steels with superior ductility and fatigue resistance.

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© 2018 The Iron and Steel Institute of Japan
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