激光处理对Ti6Al4V焊缝表面应力状况的影响

鲁金忠; 张永康; 钱小明; 任旭东

激光处理对Ti6Al4V焊缝表面应力状况的影响

江苏大学江苏省光子制造科学与技术重点实验室, 镇江 212013

基金项目: 国家自然科学基金资助项目(50275068); 江苏大学第六批学生科研课题立项(06A139)

详细信息

作者简介:
鲁金忠(1975-) ,男,湖北鄂州人,博士生,jxscience@ujs.edu.cn.

中图分类号: TN 249
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出版历程
- 收稿日期: 2006-06-01
- 网络出版日期: 2007-07-31

Effects on residual stresses of Ti6Al4V electron beam welding line by laser shock processing

Jiangsu Provincial Key Laboratory for Science and Technology of Photon Manufacturing, Jiangsu University, Zhenjiang 212013, China

摘要

摘要: 激光冲击强化是利用高功率密度(GW/cm²)、短脉冲(ns量级)激光束辐射金属时产生高强度冲击波在金属材料或零件表层形成数百兆帕的残余应力,从而改善金属材料性能的一项新技术.利用Nd:glass重复率激光和机械喷丸分别对Ti6Al4V钛合金电子束焊缝进行了冲击强化处理,研究了激光冲击处理和激光冲击+机械喷丸两种不同处理工艺对电子束焊缝残余应力的影响.试验结果表明,两种处理方式都明显改善Ti6Al4V钛合金电子束焊缝的残余压应力,尤其激光冲击＋机械喷丸工艺表面残余应力改变明显, 而且在次表面层残余应力随着深度的增加而增大, 最大残余应力出现在距表面20~30μm左右.
- 激光冲击强化 /
- 机械喷丸 /
- 残余应力 /
- Ti6Al4V电子束焊缝
Abstract: Laser shock processing radiates metals by high power density (GW/cm2), short pulse (ns level) laser beam to produce the high strength impact wave and become residual stress of several hundreds MPa. Moreover, Laser shock processing has been shown to harden the surface and improve the mechanical properties of some structural metal components. The surface of Ti6Al4V titanium alloy welding line by electron beam welding (EBW) was processed by repetition-rate Nd:glass laser and repetition-rate Nd:glass laser & mechanical peening. Effects on residual stress of the Ti6Al4V alloy welding line by two technicses have been analyzed. The results are shown that residual stress distributions of the Ti6Al4V alloy welding line by two technicses are clearly improved, and residual stress distributions the latter are more clearly. In particular compressive residual on the subsurface increased with the increase of depth, maximum residual stress appears at the depth of 20~30μm apart from surface.
- laser shock processing /
- mechanical peening /
- residual stress /
- electron beam welding of Ti6Al4V alloy

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