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Improvement of low-cycle fatigue resistance in TWIP steel by regulating the grain size and distribution
Shao, C. W.; Zhang, P.; Zhu, Y. K.; Zhang, Z. J.; Pang, J. C.; Zhang, Z. F.; Zhang, P; Zhang, ZF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
2017-08-01
发表期刊PERGAMON-ELSEVIER SCIENCE LTD
ISSN1359-6454
卷号134页码:128-142
摘要Compared to stress controlled high-cycle fatigue, enhancing strain controlled low-cycle fatigue (LCF) properties of material is much more difficult and less reported. In this study, we introduced two strategies and technologies to improve the LCF performance of Fe-Mn-C twinning induced plasticity (TWIP) steel. One is grain refining without introducing residual stress by traditional cold rolling and following recrystallization annealing (FG sample); the other is to introduce a linear gradient in grain size into TWIP steel by the original processing technology (GS sample). It is found that GS samples exhibit a higher cyclic hardening ability and cyclic saturation stress than that of as-received coarse grain (CG) samples and FG samples, which invalids the rule of mixture. Based on the dependence of the fatigue life (N-f) on the total strain amplitude (Delta epsilon/2), GS shows the longest life at high strain amplitudes, while FG shows the longest life at low strain amplitudes. Judging from the aspect of stress (Delta sigma/2-N-f curve), i.e. the Basquin curve, GS exhibits a better LCF performance than both FG and CG. The excellent fatigue properties of GS are believed to originate from the large generation of geometrically necessary dislocations (GNDs) and the formation of hard core and soft shell structure during cyclic loading. The significant influences of grain size and distribution on fatigue damage mechanisms may provide new and important implications for the optimized microstructural design of the high fatigue performance material. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; Compared to stress controlled high-cycle fatigue, enhancing strain controlled low-cycle fatigue (LCF) properties of material is much more difficult and less reported. In this study, we introduced two strategies and technologies to improve the LCF performance of Fe-Mn-C twinning induced plasticity (TWIP) steel. One is grain refining without introducing residual stress by traditional cold rolling and following recrystallization annealing (FG sample); the other is to introduce a linear gradient in grain size into TWIP steel by the original processing technology (GS sample). It is found that GS samples exhibit a higher cyclic hardening ability and cyclic saturation stress than that of as-received coarse grain (CG) samples and FG samples, which invalids the rule of mixture. Based on the dependence of the fatigue life (N-f) on the total strain amplitude (Delta epsilon/2), GS shows the longest life at high strain amplitudes, while FG shows the longest life at low strain amplitudes. Judging from the aspect of stress (Delta sigma/2-N-f curve), i.e. the Basquin curve, GS exhibits a better LCF performance than both FG and CG. The excellent fatigue properties of GS are believed to originate from the large generation of geometrically necessary dislocations (GNDs) and the formation of hard core and soft shell structure during cyclic loading. The significant influences of grain size and distribution on fatigue damage mechanisms may provide new and important implications for the optimized microstructural design of the high fatigue performance material. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属[shao, c. w. ; zhang, p. ; zhu, y. k. ; zhang, z. j. ; pang, j. c. ; zhang, z. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china ; [shao, c. w. ; zhang, z. f.] univ chinese acad sci, beijing 100049, peoples r china
关键词High-mn Twip Steels Grain Size Gradient Structure Life Improvement Fatigue Damage Mechanism
学科领域Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者National Natural Science Foundation of China (NSFC) [51301179, 51331007, 51501198, U1664253]; foundation of Shenyang National Laboratory for Materials Science [2017FP24, 2017RP31]
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/79168
专题中国科学院金属研究所
通讯作者Zhang, P; Zhang, ZF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式
GB/T 7714
Shao, C. W.,Zhang, P.,Zhu, Y. K.,et al. Improvement of low-cycle fatigue resistance in TWIP steel by regulating the grain size and distribution[J]. PERGAMON-ELSEVIER SCIENCE LTD,2017,134:128-142.
APA Shao, C. W..,Zhang, P..,Zhu, Y. K..,Zhang, Z. J..,Pang, J. C..,...&Zhang, ZF .(2017).Improvement of low-cycle fatigue resistance in TWIP steel by regulating the grain size and distribution.PERGAMON-ELSEVIER SCIENCE LTD,134,128-142.
MLA Shao, C. W.,et al."Improvement of low-cycle fatigue resistance in TWIP steel by regulating the grain size and distribution".PERGAMON-ELSEVIER SCIENCE LTD 134(2017):128-142.
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