电加工与模具

采用激光选区熔化成形技术制备了TC4钛合金试样,检测分析了试样的表面粘粉现象及表面残余应力分布状态。在保证熔池充分熔化的前提下,减少熔池热输入可有效缓解成形件表面的粘粉现象。成形件沿生长方向存在较大的拉伸残余应力,易导致层间剥离,应通过后续热处理减小残余应力累积。

TC4 titanium alloy samples were fabricated by selective laser melting,the surface adhesion and the residual stress distribution of the samples were analyzed. Under the premise of ensuring the full melting of the weld pool,reducing the heat input of the molten pool can effectively alleviate the surface adhesion. There is great tensile residual stress along the growth direction,which is easy to lead to delamination between layers. The residual stress accumulation should be reduced by the heat treatment.