钛合金零件去应力退火热处理变形研究

Study on Deformation of Titanium Alloy Part by Stress Relief Annealing

利用ABAQUS软件对某钛合金框零件在去应力退火热处理过程中的变形问题进行数值模拟研究。考虑了锻造、机加等前端工序带来的残余应力对后续零件热处理变形的影响,实现了基于实际制造的连续多过程、多物理场耦合的仿真分析。同时充分考虑零件实际热处理过程中同工装的装配和接触关系,研究了工装对零件热处理变形的影响。结果表明,在考虑初始残余应力的情况下,自由放置的零件在热处理过程中伴随着内应力的释放和重新分布发生了蠕变,变形趋势同实际测量结果一致,且变形大小在同一数量级。此外,采用同材质的钛合金工装配合随形块的装夹方式能够减小热处理过程中工装对零件的影响,有效保证零件外形,从而达到控制零件热处理变形的目的。

ABAQUS software was used to study on the deformation of a frame part of titanium alloy during stress relief annealing.For the numerical simulation,the influence of residual stress caused by front-end processes such as forging and machining was considered,and a simulation analysis of multi-process and multi-physical field coupling based on real manufacturing was realized.Also,the influence of assembly relationship between the part and tooling was studied.The results show that,considering the initial residual stress,the freely placed parts creep during heat treatment with the release and redistribution of the internal stress,the deformation trend is consistent with the actual measurement results,and the deformation value is in the same order of magnitude.In addition,using tooling of titanium alloy with conformal blocks is beneficial to reduce the adverse effect of tooling on the part and effectively maintain the shape of the part,so as to control the deformation of the part during heat treatment.