电子束焊接及局部热处理复合技术的数值分析

Numerical analysis of electron beam welding and local heat treatment combination technology

电子束焊接及局部热处理复合技术是一种多功能的电子束加工技术。文中以ANSYS有限元分析软件为平台,对2,6和12mm厚的TC4钛合金平板电子束焊接和局部热处理时的温度场和应力场进行了数值模拟计算,详细分析了局部热处理对不同厚度钛合金平板电子束焊接温度场和残余应力场的影响规律。结果表明,在给定的计算条件下,2mm厚TC4钛合金平板的电子束局部热处理效果最好,电子束局部热处理后上表面距焊缝中心线4mm的区域内冷却速度基本一致,纵向残余拉应力最大值由780MPa降低到560MPa,减小幅度达到28%。

Electron beam welding and local heat treatment is a new combination processing technology.Its temperature and stress fields were computed by finite element method with ANSYS software code,and 2 mm,6 mm and 12 mm thick TC4 titanium alloy plates were taken as the researched objects.The influence rules of local heat treatment on temperature and stress fields of electron beam welding for different thickness plates were analyzed.It is found that the effect of electron beam local heat treatment of 2 mm thick titanium alloy plate is the best under the given computational condition.Within the distance of 4 mm from the centerline at the surface,cooling rate are almost the same after electron beam local heat treatment.The maximum longitudinal residual stress reduces from 780 MPa to 560 MPa.The decrease amplitude reaches 28%.