Research on Improving Mechanical Properties of Welding Joints in Low-ally Steel by LSP
Laser Shock Processing (LSP) has became an advanced method for the purpose of improving the mechanical properties such as hardness and fatigue strength. In this paper, one of the recent works on LSP in the application of the elimination of welding residual tensile stress is described. Nanosecond laser pulses of extreme intensity generated subsequent plasma. The rapid expansion of high pressure plasma creates a shock wave that propagates through the material, creating dislocations and inducing plastic deformation. Thus it can effectively eliminate welding residual tensile stress and improve fatigue capability of welding joints. The technology compared to the method of dynamite blasting is more safer and environment friendly, as well as precisely eliminate welding residual stress by controlling laser density, shock numbers, shock region and shock angle, it also could purposely achieve grain refine and producing a large amount of residual stress in welding region. The results showed that in 12Cr2Ni4A material experiment, laser shock has a broad application prospects in post-processing welding field.
Laser Shock Processing welding joints of 12Cr2Ni4A study of Mechanism
WANG Cheng ZHOU Liu-cheng LI Ying-hong AN Zhi-bing CHEN Dong-lin
Aircraft and Power Engineering Department,College of Engineering,Airforce Engineering University,Shaanxi Xian 710038,China
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
552-556
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）