Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 655, Issue -, Pages 251-255Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.01.003
Keywords
Twinning-induced plasticity (TWIP) steel; Strain rate sensitivity (SRS); Twin; Dynamic strain aging (DSA); Tensile strength
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Funding
- National Natural Science Foundation of China (NSFC) [51331007, 51501198]
- IMR foundation
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The strain rate sensitivity (SRS) of Fe-22Mn-0.6C and Fe-30Mn-3Si-3Al twinning-induced plasticity (TWIP) steel was studied in the strain rate range from 10(-4) to 10 degrees s(-1). The Fe-22Mn-0.6C steel exhibited negative SRS, while the Fe-30Mn-3Si-3Al steel showed positive SRS. Dynamic strain aging (DSA) was detected in Fe-22Mn-0.6C steel but not in Fe-30Mn-3Si-3Al steel. Accordingly, the two typical TWIP steels can be classified as DSA-facilitated and DSA-free TWIP steels. Meanwhile, the density of twin boundary obviously decreased in Fe-22Mn-0.6C steel but had little change in Fe-30Mn-3Si-3Al steel with increasing the strain rate. The different SRS phenomena were discussed based on the twinning mechanism and DSA effect. (C) 2016 Elsevier B.V. All rights reserved.
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