Response of laser shock on high speed steel W9Cr3Mo4V

被引：0

作者：

Fan Y.-J. ^{[1
,2
]}

Guo E.-B. ^{[2
]}

Dai Y.-B. ^{[2
]}

Cui P.-F. ^{[2
]}

Tang D.-Y. ^{[2
]}

机构：

[1] School of Mechanical Engineering, Jiangsu University, Zhenjiang

[2] School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang

来源：

Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2016年 / 24卷

关键词：

Elasticity modulus; Laser shock; Microstructure; Nano-hardness; Residual stress; W9Cr3Mo4V steel;

D O I：

10.3788/OPE.20162413.0094

中图分类号：

学科分类号：

摘要：

The response properties of laser shock on high-speed steel W9Mo3Cr4V were studied experimentally by adopting different laser energies and shock frequencies. The experiment result indicates that the area under laser shock produces round pits, depth of which will increase as the laser energy and shock frequency increase. The surface residual stress exists in the surface of the impacted area under laser shock, and such residual stress increases as the laser energy and shock frequency increase; but the maximum residual stress will approach saturation after three times of shock, without obvious stress amplification. The nano-hardness and elasticity modulus in the pimple center increase as the laser energy and shock frequency increase, and compared with the matrix, the maximum increases for the nano-hardness and elasticity modulus are respectively 15.04% and 14.35%. Impacted by the force effect of shock wave along the depth direction, the grain size in laser shock impacted area is approximately 10 μm as a minimum, which increases with the increase of distance. According to the variation of grain sizes, the impacted area can be divided into 5 layers: severe plastic deformation layer, plastic deformation layer, slight plastic deformation layer, transition layer and the matrix. Laser chock can effectively refine surface layer grain of the high-speed steel W9Cr3Mo4V and improve the mechanical property in surface layer of the impacted area, thus providing guidance for the fabrication of laser shock strengthening high-speed steel tools. © 2016, Science Press. All right reserved.

引用

页码：94 / 102

页数：8

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