QP钢低频振动辅助拉伸力学行为与微观组织演变研究

doi:10.3901/JME.2022.20.242

机械工程学报 ›› 2022, Vol. 58 ›› Issue (20): 242-249.doi: 10.3901/JME.2022.20.242

• 特邀专栏：高性能塑性成形制造(下) • 上一篇下一篇

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QP钢低频振动辅助拉伸力学行为与微观组织演变研究

李琦, 许亚坤, 庄新村, 赵震

上海交通大学材料科学与工程学院上海 200030

收稿日期:2021-11-29 修回日期:2022-06-10 出版日期:2022-10-20 发布日期:2022-12-27
通讯作者: 庄新村(通信作者)，男，1980年出生，博士，教授。主要研究方向为板锻成形工艺设计及模具优化。E-mail：georgezxc@sjtu.edu.cn
作者简介:李琦，男，1999年出生，硕士研究生。主要研究方向为金属振动辅助成形。E-mail：18116205206@sjtu.edu.cn
基金资助:
上海市优秀学术带头人计划资助项目(21XD1422000)。

Study on Mechanical Behavior and Microstructure Evolution of QP Steel under Low-frequency Vibration Assisted Tension

LI Qi, XU Yakun, ZHUANG Xincun, ZHAO Zhen

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030

Received:2021-11-29 Revised:2022-06-10 Online:2022-10-20 Published:2022-12-27

摘要/Abstract

摘要： 相比传统塑性加工，振动辅助成形有降低成形力和改善表面质量等有益效果，为解决QP钢成形力大和起皱等问题提供了新的可能性。通过自行设计的液压激振装置在QP1180的拉伸试验中引入低频振动，研究低频振动场对QP钢拉伸力学行为与微观组织演变的影响。结果表明，在施加振动阶段，低频振动的叠加引起QP钢拉伸应力剧烈波动，同时出现瞬时振动软化现象；振动去除后出现瞬时残余硬化现象，振动软化量和残余硬化量随着振幅的增大逐渐提高。EBSD结果表明：QP钢振动辅助拉伸过程中振动场的叠加促进了位错增殖，位错增殖量随着振幅的增加而增大。通过XRD探究了振动场对QP钢TRIP效应的影响，结果显示振动场的叠加可有效促进残余奥氏体向马氏体的转变，且随着振幅的增大TRIP效应愈加明显。

关键词: 低频振动辅助拉伸, QP钢, 振动软化现象, 残余硬化现象, TRIP效应

Abstract: Vibration-assisted forming has beneficial effects such as reducing forming forces and improving surface quality compared to conventional plastic processing. It provides a new possibility to solve the problems of large forming force and wrinkling of QP steel. The effects of low-frequency vibration field on the mechanical behavior and microstructure evolution of QP steel were investigated by superimposing low-frequency vibration in the tensile test of QP1180 through a self-designed hydraulic excitation device. In the applied vibration stage, the superposition of low-frequency vibration causes sharp fluctuations in the tensile stress of QP steel, and the phenomenon of transient vibration softening occurs. After removing the vibration, the phenomenon of transient residual hardening occurs as well. The vibration softening amount and residual hardening amount gradually increase with the increase of vibration amplitude. The results of EBSD show that the superposition of vibration fields during vibration-assisted tension of QP steel promote dislocation proliferation, and the amount of dislocation proliferation increased with the increase of amplitude. The effect of vibration field on the TRIP effect of QP steel was investigated by XRD. And the results show that the superposition of vibration field can effectively promote the transformation of residual austenite to martensite and the TRIP effect becomes more and more obvious with the increase of amplitude.

Key words: low-frequency vibration assisted tensile, QP steel, vibration softening phenomenon, residual hardening, TRIP effect

中图分类号:

TG156

李琦, 许亚坤, 庄新村, 赵震. QP钢低频振动辅助拉伸力学行为与微观组织演变研究[J]. 机械工程学报, 2022, 58(20): 242-249.

LI Qi, XU Yakun, ZHUANG Xincun, ZHAO Zhen. Study on Mechanical Behavior and Microstructure Evolution of QP Steel under Low-frequency Vibration Assisted Tension[J]. Journal of Mechanical Engineering, 2022, 58(20): 242-249.

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QP钢低频振动辅助拉伸力学行为与微观组织演变研究

Study on Mechanical Behavior and Microstructure Evolution of QP Steel under Low-frequency Vibration Assisted Tension

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