中文摘要：

采用有限元法分析钨/钢扩散焊接头残余应力，并探讨添加钒/镍和钒/铜复合中间层对钨/钢扩散焊接头残余应力分布的影响。结果表明：钨/钢扩散焊接头存在较大的残余应力，靠近中间层附近的钨处存在极大的径向压应力，而靠近中间层附近的钢处和整个中间层区域均存在较大径向拉应力；钨/钢直接扩散焊接头的残余应力极大，钨/钒/镍/钢扩散焊接头的残余应力有所降低，钨/钒/铜/钢扩散焊接头残余应力最小；接头力学性能及断裂特征验证了有限元计算结果的准确性。

英文摘要：

A finite element method was employed to evaluate the residual stresses in W/FS （ferritic steel） joints, and the influences of V/Ni and V/Cu composite interlayer on residual stress distribution of W/FS joints were discussed. The results show that large residual stress is generated in W/FS diffusion bonded joints. The maximum compressive residual stress is presented in the tungsten near interlayer, while large tensile residual stress is shown in interlayer and steel near interlayer as well. The residual stress of W/FS direct diffusion bonded joint is the largest, the residual stress of W/V/Ni/FS joint is lower, and the residual stress of W/V/Cu/FS joint is the least. The tensile strength of the joints and fracture characteristics verify the accuracy of calculation results of the FEA.