应变速率对Fe-11Mn-2Al-0.2C中锰钢变形行为的影响

doi:10.12068/j.issn.1005-3026.2020.07.020

东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (7): 1041-1047.DOI: 10.12068/j.issn.1005-3026.2020.07.020

应变速率对Fe-11Mn-2Al-0.2C中锰钢变形行为的影响

蔡志辉^1,2，张德良¹，周彦君¹，文光奇¹

(1.东北大学材料科学与工程学院，辽宁沈阳110819； 2.攀钢集团研究院有限公司，四川攀枝花617000)

收稿日期:2020-02-07 修回日期:2020-02-07 出版日期:2020-07-15 发布日期:2020-07-15
通讯作者: 蔡志辉
作者简介:蔡志辉(1985-)，男，福建漳州人，东北大学副教授.
基金资助:
国家自然科学基金资助项目(51974084，51501035)；中央高校基本科研业务费专项资金资助项目(N170204017).

Effect of Strain Rate on Deformation Behavior of Fe-11Mn-2Al-0.2C Medium-Mn Steel

CAI Zhi-hui^1,2， ZHANG De-liang¹， ZHOU Yan-jun¹， WEN Guang-qi¹

1. School of Materials Science & Engineering， Northeastern University， Shenyang 110819， China； 2. Pangang Group Research Institute Co.， Ltd.， Panzhihua 617000， China.

Received:2020-02-07 Revised:2020-02-07 Online:2020-07-15 Published:2020-07-15
Contact: CAI Zhi-hui
About author:-
Supported by:
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摘要/Abstract

摘要： 对Fe-11Mn-2Al-0.2C中锰钢进行不同应变速率(2×10^-4~200s^-1)下的拉伸试验，探讨其力学性能和变形机制.结果表明:随应变速率的增加，抗拉强度由1456MPa逐渐降低到1086MPa；在应变速率为2×10^-4~20s^-1时，总伸长率由48.2%降低到38.2%；在应变速率为20~200s^-1时，由38.2%上升至44.0%.随应变速率的增加，试样的显微组织被拉长、扭曲、切断；韧窝形态由深的等轴韧窝向浅的卵形韧窝转变；试样受力由正应力为主导逐渐转变为剪切应力为主导.变形机制与应变速率有关，低应变速率(2×10^-4~2×10^-3s^-1)下TRIP效应明显；中应变速率(2×10^-2~2s^-1)下TRIP效应受到抑制，出现TWIP效应；高应变速率(2~200s^-1)下TRIP和TWIP效应都增强.

关键词: 中锰钢, 应变速率, 变形行为, TRIP效应, TWIP效应

Abstract: Mechanical properties and deformation behavior of Fe-11Mn-2Al-0.2C medium-Mn steel tensioned at different strain rates(2×10^-4~200s^-1) were studied. The results show that tensile strength decreases monotonically from 1456MPa to 1086MPa with the increase of strain rate. The total elongation decreases from 48.2% to 38.2% during the strain rate ranging from 2×10^-4s^-1 to 20s^-1， followed by an increase to 44% when the strain rate reaches 2×10²s^-1. According to the fractography， it is found that with the increase of strain rate， the microstructure of the tested samples are elongated， twisted and cut. The morphology of dimples are transformed from deep-equiaxed shape to shallow oval one， which indicates that the stress state of the tensioned samples is shifted from normal stress to shear stress. Furthermore， deformation mechanism is also greatly affected by the strain rate. Transformation-induced plasticity(TRIP) effect is dominant at low strain rates(2×10^-4~2×10^-3s^-1)， while it is suppressed at medium strain rates(2×10^-2~2s^-1) and twining-induced plasticity(TWIP) effect occurs. At high strain rates(2~200s^-1)， both TRIP and TWIP effect are promoted.

Key words: medium-Mn steel, strain rate, deformation behavior, TRIP effect；TWIP effect

中图分类号:

TP20

蔡志辉，张德良，周彦君，文光奇. 应变速率对Fe-11Mn-2Al-0.2C中锰钢变形行为的影响[J]. 东北大学学报:自然科学版, 2020, 41(7): 1041-1047.

CAI Zhi-hui， ZHANG De-liang， ZHOU Yan-jun， WEN Guang-qi. Effect of Strain Rate on Deformation Behavior of Fe-11Mn-2Al-0.2C Medium-Mn Steel[J]. Journal of Northeastern University Natural Science, 2020, 41(7): 1041-1047.

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应变速率对Fe-11Mn-2Al-0.2C中锰钢变形行为的影响

Effect of Strain Rate on Deformation Behavior of Fe-11Mn-2Al-0.2C Medium-Mn Steel

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