高温合金电子束焊接温度场数值模拟

根据熔池边界准则应用有限元方法对高温合金电子束焊接温度场进行了数值模拟.通过线性插值、等效代换等方式估计材料高温参数,模拟材料状态变化.针对电子束焊接特有的钉头状焊缝及其穿透深度大的特点,采用高斯面热源与柱体热源组成的组合热源模型,对焊接温度场进行分析,模拟结果与实际焊缝取得了良好的一致.获得了一定工艺条件下高温合金电子束焊接温度场的分布特征及焊接过程热循环曲线,为优化电子束焊接工艺和电子束焊接残余应力研究提供了参考.

Numerical simulation on electron beam welding temperature field of heat-resisting superalloy

The temperature field of electron beam welding(EBW) in heat-resisting superalloy was simulated based on fusion zone boundary principle by finite-element method.The high temperature parameters of the material were estimated by linear interpolation method,equivalent replacement method etc.The combined model with Gauss surface heat source and cylindrical heat source was used according to both the nail-shaped weld and the deep penetration of electron beam welding.The simulation result was consistent with the real weld.The characteristics of temperature distribution of electron beam welding in the superalloy,and the heat cycle curves were showed in the results.The results offered information for optimizing the EBW process and studying on the residual stress.