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Low-cycle and extremely-low-cycle fatigue behaviors of high-Mn austenitic TRIP/TWIP alloys: Property evaluation, damage mechanisms and life prediction
Shao, C. W.; Zhang, P.; Liu, R.; Zhang, Z. J.; Pang, J. C.; Zhang, Z. F.; pengzhang@imr.ac.cn; zhfzhang@imr.ac.cn
2016
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume103Pages:781-795
AbstractThe cyclic deformation and damage behaviors of the Fe-Mn and Fe-Mn-C TRIP/TWIP steels are comprehensively studied in a wide range of strain amplitude (from 0.3% to 8.0%). It is found that with increasing C content, the dislocation structures change from wavy slip to planar slip after cyclic deformation. In order to evaluate the low-cycle and extremely-low-cycle fatigue (LCF and ELCF) properties, a fatigue life prediction model, N-f= (W-a/W0)ss, with a hysteresis energy-based criterion is used and developed. The model reveals that the LCF and ELCF damage mechanisms can be controlled by the material's damage capacity (the intrinsic fatigue toughness W-o) and its ability of transforming mechanical work into effective damage (the damage transition exponent ss). From a macroscopic point of view, Wo is related to the match of strength and ductility (approximately the static toughness U), and ss mainly has a negative correlation with the cyclic strain hardening exponent n'. On the micro-scale level, W-o represents the defect-accommodated ability of the materials, and ss is determined by the uniformity and reversibility of plastic deformation. For the current Fe Mn(-C) TRIP/TWIP steels with increasing C content, the cooperation between an increasing damage capacity and an incremental damage accumulation rate leads to a higher ELCF property and a lower LCF property. (c) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
description.department[shao, c. w. ; zhang, p. ; liu, r. ; zhang, z. j. ; pang, j. c. ; zhang, z. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
KeywordHigh-mn Trip/twip Steels Low-cycle Fatigue Extremely-low-cycle Fatigue Hysteresis Energy Damage Mechanism Fatigue Life
Funding OrganizationNational Natural Science Foundation of China (NSFC) [51301179, 51331107]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74946
Collection中国科学院金属研究所
Corresponding Authorpengzhang@imr.ac.cn; zhfzhang@imr.ac.cn
Recommended Citation
GB/T 7714
Shao, C. W.,Zhang, P.,Liu, R.,et al. Low-cycle and extremely-low-cycle fatigue behaviors of high-Mn austenitic TRIP/TWIP alloys: Property evaluation, damage mechanisms and life prediction[J]. ACTA MATERIALIA,2016,103:781-795.
APA Shao, C. W..,Zhang, P..,Liu, R..,Zhang, Z. J..,Pang, J. C..,...&zhfzhang@imr.ac.cn.(2016).Low-cycle and extremely-low-cycle fatigue behaviors of high-Mn austenitic TRIP/TWIP alloys: Property evaluation, damage mechanisms and life prediction.ACTA MATERIALIA,103,781-795.
MLA Shao, C. W.,et al."Low-cycle and extremely-low-cycle fatigue behaviors of high-Mn austenitic TRIP/TWIP alloys: Property evaluation, damage mechanisms and life prediction".ACTA MATERIALIA 103(2016):781-795.
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