Change of surface integrity of Ti-6Al-4V titanium alloy by laser shock processing at middle and high temperatures

HOU Lihua; REN Xudong; ZHOU Wangfan; DAI Wenjie; XU Shidong; HUANG Jingjing

doi:10.7510/jgjs.issn.1001-3806.2016.02.029

In order to study effect of laser shock processing (LSP) on surface integrity of Ti-6Al-4V titanium alloy at middle and high temperatures, a high power short pulse Nd:YAG laser was used to shock the surface of Ti-6Al-4V titanium alloy. And then, the specimens after LSP were held at 400℃, 500℃, 550℃ and 600℃ respectively for one hour. The influence of LSP on surface integrity of Ti-6Al-4V titanium alloy at middle and high temperatures were analyzed from surface morphology, surface roughness and surface residual stress. The results indicate that LSP increases the surface roughness of Ti-6Al-4V titanium alloy. The surface roughness increases with the increase of heat treatment temperature. The surface residual stress of Ti-6Al-4V titanium alloy increases obviously after LSP. The higher the temperature, the smaller the surface residual stress is. The research results are helpful for understanding the performance of Ti-6Al-4V titanium alloy.

Change of surface integrity of Ti-6Al-4V titanium alloy by laser shock processing at middle and high temperatures

Corresponding author: REN Xudong, renxd@mail.ujs.edu.cn;

1. School of Mechanical Engineering, Jiangsu University, Zhengjiang 212013, China

Received Date: 2015-01-22

Accepted Date: 2015-02-15

Available Online: 2016-03-25

Abstract: In order to study effect of laser shock processing (LSP) on surface integrity of Ti-6Al-4V titanium alloy at middle and high temperatures, a high power short pulse Nd:YAG laser was used to shock the surface of Ti-6Al-4V titanium alloy. And then, the specimens after LSP were held at 400℃, 500℃, 550℃ and 600℃ respectively for one hour. The influence of LSP on surface integrity of Ti-6Al-4V titanium alloy at middle and high temperatures were analyzed from surface morphology, surface roughness and surface residual stress. The results indicate that LSP increases the surface roughness of Ti-6Al-4V titanium alloy. The surface roughness increases with the increase of heat treatment temperature. The surface residual stress of Ti-6Al-4V titanium alloy increases obviously after LSP. The higher the temperature, the smaller the surface residual stress is. The research results are helpful for understanding the performance of Ti-6Al-4V titanium alloy.

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Reference (18)

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Change of surface integrity of Ti-6Al-4V titanium alloy by laser shock processing at middle and high temperatures

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