Journal
ISIJ INTERNATIONAL
Volume 58, Issue 8, Pages 1383-1395Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.ISIJINT-2018-237
Keywords
dynamic strain aging; work hardening; high Mn austenitic steel; premature fracture; fatigue; serrated flow
Categories
Funding
- JSPS KAKENHI [JP17H04956, JP16H06365]
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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 (1) the pinning effect on extended dislocation for the work hardening, (2) the Poretvin-Le Chatelier banding effect on damage evolution for the tensile elongation, and (3) 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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