孪生诱发塑性钢拉伸与疲劳性能及变形机制

doi:10.11900/0412.1961.2019.00389

金属学报

2020, Vol. 56

Issue (4): 476-486 DOI: 10.11900/0412.1961.2019.00389

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孪生诱发塑性钢拉伸与疲劳性能及变形机制

张哲峰(

),邵琛玮,王斌,杨浩坤,董福元,刘睿,张振军,张鹏

中国科学院金属研究所沈阳 110016

Tensile and Fatigue Properties and Deformation Mechanisms of Twinning-Induced Plasticity Steels

ZHANG Zhefeng(

),SHAO Chenwei,WANG Bin,YANG Haokun,DONG Fuyuan,LIU Rui,ZHANG Zhenjun,ZHANG Peng

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

张哲峰,邵琛玮,王斌,杨浩坤,董福元,刘睿,张振军,张鹏. 孪生诱发塑性钢拉伸与疲劳性能及变形机制[J]. 金属学报, 2020, 56(4): 476-486.
Zhefeng ZHANG, Chenwei SHAO, Bin WANG, Haokun YANG, Fuyuan DONG, Rui LIU, Zhenjun ZHANG, Peng ZHANG. Tensile and Fatigue Properties and Deformation Mechanisms of Twinning-Induced Plasticity Steels[J]. Acta Metall Sin, 2020, 56(4): 476-486.

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摘要:

随着汽车工业的高速发展，以开发先进高强钢为重点的车辆轻量化设计已经成为各大汽车厂商的发展共识。本文基于国内外孪生诱发塑性(TWIP)钢强韧性和抗疲劳设计的成果以及本课题组多年来在该领域的研究工作，系统地总结了TWIP钢的研究现状及最新进展，探讨了影响TWIP钢拉伸性能与变形机制的影响因素，包括合金成分、组织状态、应变速率等。重点介绍TWIP钢的高、低周疲劳性能和微观损伤行为，并提出一种客观评价和预测低周疲劳寿命的方法。从TWIP钢的服役环境和实际应用角度出发，试图为新一代高性能TWIP钢的开发提供新的思路和实验证据。

关键词 ：孪生诱发塑性钢, 拉伸, 强度, 塑性, 高周疲劳, 低周疲劳, 疲劳寿命, 损伤机制

Abstract：

With the development of automotive industry, it is necessary to develop advanced high-strength steels for the purpose of lightweight of car. Based on the systematic studies on the strengthening and toughening as well as fatigue design of the twinning-induced plasticity (TWIP) steels, the recent progress in this aspect is summarized and discussed. Among them, the strengthening and toughening mechanisms have been analyzed and further developed in terms of several influencing factors, including compositions, microstructure, strain rate and so on. Furthermore, the low-cycle and high-cycle fatigue behaviors and damage mechanisms were explored. For better understanding the intrinsic fatigue damage mechanism, a new low-cycle fatigue prediction model regarding the hysteresis loop energy during cyclic deformation was introduced. It is found that the energy damage model can well explain and evaluate the fatigue damage mechanism and predict the low-cycle fatigue life of the TWIP steels and other materials. Based on the new fatigue damage model, new TWIP steels with high service performance can be developed by adjusting their deformation and damage mechanisms rationally.

Key words： twinning induced plasticity (TWIP) steel tension strength plasticity high-cycle fatigue low-cycle fatigue fatigue life damage mechanism

收稿日期: 2019-11-14

ZTFLH:

TG142

基金资助:国家自然科学基金项目(51801216);国家自然科学基金项目(51771208);国家自然科学基金项目(U1664253)

作者简介: 张哲峰，男，1970年生，研究员，博士

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链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00389 或 https://www.ams.org.cn/CN/Y2020/V56/I4/476

图1 合金元素对孪生诱发塑性(TWIP)钢拉伸应力-应变曲线的影响[7,8,9,10]

图2 Fe-Mn-C系和Fe-Mn-Si-Al系TWIP钢力学性能对比[9]

图3 TWIP钢中的强塑性倒置关系[14]

图4 梯度TWIP钢组织的优异强塑性匹配[16,17]

图5 应变速率对TWIP钢拉伸应力-应变曲线的影响[21]

图6 应变速率对TWIP钢强度与塑性的影响[21]

图7 TWIP钢拉伸过程中微观变形和损伤特征

图8 TWIP钢在拉伸过程中的孪生行为[24]

图9 TWIP钢高周疲劳性能[26,29]

图10 疲劳寿命预测模型和相关参量[7]

图11 TWIP钢的疲劳裂纹扩展行为[29]

图12 TWIP钢循环加载下微观变形和损伤机制[7,8]

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