Comparison of twinning evolution with work hardening ability in twinning-induced plasticity steel under different strain rates

被引：36
|
作者：
Yang, H. K. [1 ]
Zhang, Z. J. [1 ]
Zhang, Z. F. [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 622卷
基金：
中国国家自然科学基金;
关键词：
Twinning-induced plasticity (TWIP) steel; Strength; Elongation; Twin boundary; Strain rate; C TWIP STEEL; TENSILE DEFORMATION; GRAIN-SIZE; DISLOCATION; STRESS; DEPENDENCE; BEHAVIOR; AL; MICROSTRUCTURE; SUBSTRUCTURE;
D O I：
10.1016/j.msea.2014.11.031
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：184 / 188
页数：5
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