扫描路径对激光修复钛合金残余应力与变形的影响

Influence of scanning path on residual stress and distortion of laser repairing titanium alloy

为降低激光沉积修复钛合金基体的残余应力与变形,采用有限元参数化设计语言研究了不同激光扫描路径对修复基体残余应力与变形的影响,模拟了不同扫描路径下修复基体残余应力及不同修复层残余应力的分布情况,并对原因进行了分析。结果表明:不同扫描路径下基体两端残余应力值较大,修复层残余应力值两端高,中间低,采用层间交错扫描路径时,各修复层残余应力值大小和波动幅度降低,修复件表面平整度值最小。采用压痕法对不同扫描方式下修复件表面残余应力进行了测定,得到了不同扫描路径下基体变形曲线,并与模拟结果进行了比较,两者吻合较好,为提高激光修复质量提供了参考依据。

In order to decrease the residual stress and distortion of laser repairing titanium alloy substrate, the influence of different laser scanning paths on the residual stress and distortion of repairing substrate was researched by using ANSYS parameter design language, the residual stress distribution of different layers and different scanning paths was simulated. The result shows that the residual stress of both ends of repairing substrate is higher than other location, the residual stress of repairing layers is higher in both ends, and lower in the middle. The residual stress and its ranges in different repairing layers is lower by using direction orthogonal changing scanning paths, and the flatness of repairing substrate decreases. The residual stress of repairing substrates under different scanning paths was measured by indentation test, the distortion curves of different scanning paths were drawn, which was in good agreement with simulated results.