扫描路径对激光修复钛合金残余应力与变形的影响

发布时间：2019-03-26 21:30

【摘要】：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。
[Abstract]:In order to reduce the residual stress and deformation of titanium alloy matrix repaired by laser deposition, the effects of different laser scanning paths on the residual stress and deformation of titanium alloy matrix were studied by using finite element parametric design language. The distribution of residual stress in matrix and repair layer under different scanning paths is simulated and the causes are analyzed. The results show that the residual stress value at both ends of the matrix is larger under different scanning paths, and the residual stress value for repair layer is higher at both ends and lower in the middle. When the interlaminar scanning path is used, the residual stress value and fluctuation range of each repair layer decrease. The surface flatness value of the repair piece is minimum. The residual stresses on the surface of the repaired parts under different scanning modes were measured by indentation method. The deformation curves of the matrix under different scanning paths were obtained and compared with the simulated results. The results show that the two methods are in good agreement with each other. It provides a reference for improving the quality of laser repair.
【作者单位】：沈阳航空航天大学航空制造工艺数字化国防重点学科实验室;沈阳飞机设计研究所;北京航空航天大学材料科学与工程学院;
【基金】：国家自然科学基金(51305280,51375316) 国防基础科研(A3520133001) 航空基金(2013ZE54017)
【分类号】：TG665;TG146.23

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