激光相变热处理对TC4电子束焊缝残余应力的影响
1. 江苏大学机械工程学院 ,江苏 镇江 212013;
2. 北京航空制造工程研究所 ,北京 100024)
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摘要
利用CO2激光相变热处理技术对TC4钛合金电子束焊缝进行了处理,研究了激光功率、光斑直径、辅助气体等激光工艺参数对电子束焊缝残余应力分布的影响。实验结果表明,激光相变热处理改善了焊缝残余应力的分布,使焊缝表面残余应力由拉应力转变为压应力,其压应力值随着激光功率的增加而增大,随着激光光斑直径的减小而增加;辅助气体为O2时残余压应力值比辅助气体为N2大30~40MPa,激光相变热处理显著提高了TC4钛合金电子束焊缝的残余压应力及其使用寿命。
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