Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 622, Issue -, Pages 184-188Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.11.031
Keywords
Twinning-induced plasticity (TWIP) steel; Strength; Elongation; Twin boundary; Strain rate
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Funding
- National Natural Science Foundation of China (NSFC) [51301179, 51331007]
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For Fe-22Mn-0.6C (wt%) twinning-induced plasticity (TWIP) steel with grain sizes of 35 and 170 mu m, both the ultimate tensile strength and uniform elongation decrease with increasing the tensile strain rates (from 10(-4) to 10(0) s(-1)). The density of twin boundary (DTB) is presumed to be the major factor influencing mechanical properties. Accordingly, a parameter 2/(t+s) (t and s represent the thickness and spacing of deformation twins), also the inverse of the mean free path for dislocation slip, is proposed to characterize the planar-oriented twinned structure in infinite grain size (D >> t approximate to s). It also evaluates the effect of DTB on the work hardening ability and ductility of the TWIP steel. (C) 2014 Elsevier B.V. All rights reserved.
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