Effects of high-frequency vibration on quenched residual stress in Cr12MoV steel
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ong Hu College of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, People’s Republic of China
Jin-tao Lai Department of Mechanical and Electrical Engineering, Shaoxing University, Shaoxing 312000, People’s Republic of China
Zi-di Jin Zhejiang Province Key Laboratory of Advanced Manufacturing Technology, Zhejiang University, Hangzhou 310027, People’s Republic of China; and Beijing Geolight Technology Co., Ltd., Beijing 102628, People’s Republic of China
Hui Zhou Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, UK
Zhen-sheng Yang College of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, People’s Republic of China
Long Pan Zhejiang Province Key Laboratory of Advanced Manufacturing Technology, Zhejiang University, Hangzhou 310027, People’s Republic of China (Received 23 June 2016; accepted 23 September 2016)
The high-frequency vibration technology was introduced to relieve the quenched residual stress in the Cr12MoV steel based on the high-frequency vibration system that mainly consisted of an electromagnetic vibrator and an amplitude boost unit. The high-frequency vibratory stress relief (VSR) experiments were conducted to study the effectiveness of the high-frequency vibration technology. In addition, the high-frequency vibration plasticity model was developed based on the thermal activation theory to reveal the mechanism of the high-frequency VSR. The results show that the high-frequency VSR has good effects on eliminating residual stress, while the surface hardness for the Cr12MoV steel remains almost the same. Moreover, there are no changes in the grain size of the Cr12MoV steel during the high-frequency VSR, while the dislocation density for the Cr12MoV steel during the high-frequency VSR decreases by 27.21%. The decrease of dislocation density in the Cr12MoV steel is the essence of residual stress relaxation. The findings confirm the significant effects of high-frequency vibration on metal plasticity and provide a basis to understand the underlying mechanism of the high-frequency VSR.
I. INTRODUCTION
Alloy tool steel is widely used in the engineering community, such as the Cr12MoV steel, a kind of alloy tool steel being used for manufacturing the molds, wear resistant components, cutting tools, etc. To improve the performance of the alloy tool steel, the quenching process is used frequently during the manufacturing process. The
Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2016.378
microstructure for the as-quenched alloy tool steel is martensite, which results in that the alloy tool steel possesses lager surface hardness. However, the deformation resistant capability for the as-quenched alloy tool steel is reduced owing to the existence of the larger residual stress, e.g., the slide valve pair including the valve spool and the valve bush will be locked owing to the slow deformation caused by the release of residua
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