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

doi:10.3901/JME.2022.20.242

Abstract

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

CLC Number:

TG156

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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