(1. 华东理工大学 材料科学与工程学院，上海 200237；
2. 中国矿业大学 材料科学与工程学院，徐州 221008；
3. 宁波工程学院 材料工艺研究所，宁波 315016)
摘 要: 采用放电等离子烧结(SPS)技术，利用MoSi2/316L梯度材料作为过渡层连接MoSi2与316L不锈钢，并运用有限元软件ANSYS对MoSi2与316L不锈钢接头制备过程中所产生的残余应力进行分析。结果表明：随成分分布指数P增加，最大径向和轴向残余拉应力先减后增，当P＝0.8时，两者同时接近最小，且MoSi2侧的最大径向拉应力较小；随梯度层数n增加，最大径向和轴向残余拉应力逐渐减小，当n＝9时，最大径向和轴向残余拉应力分别降为n＝0时的24%和25%，且梯度层继续增多时，变化趋势变得平缓；随梯度层厚度d增加，最大径向和轴向残余拉应力逐渐减小，当d=1.0 mm时，变化趋势平缓；利用P＝0.8、d＝1.0 mm、n=9的MoSi2/316L梯度材料作为过渡层体系获得致密且均匀的连接接头。
关键字: MoSi2；316L不锈钢；连接；梯度过渡层；残余应力
of MoSi2/316L stainless steel joining
（1. School of Materials Science and Engineering, East China University of Science and Technology, Shanghai
200237, China;
2. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 22100,
China;
3. Institute of Techniques, Ningbo Institute of Engineering, Ningbo 315016, China）
Abstract:The feasibility of joining MoSi2 to 316L stainless steel with spark plasma sintering(SPS) techniques was investigated with MoSi2 /316L stainless steel graded material as the interlayer system. The residual stresses in the joint were analyzed by finite element software ANSYS. The results show that with the increase of compositional distribution exponent (P), the maximum radial and axial residual tension stresses increase firstly then decrease, approach to the minimum simultaneously when P=0.8, and the maximum radial tension stress of MoSi2 side is relatively little. With increasing graded layer number (n), the maximum radial and axial residual tension stresses decrease gradually; When n is 9 the maximum radial and axial residual tension stresses are reduced by 24% and 25%, respectively, compared with those when n is 0, and both of the trends become smooth when n continues to increase gradually. With the increase of the graded layer thickness (d), the maximum radial and axial residual tension stresses decrease gradually, the trend becomes smooth when d=1.0 mm. The dense, uniform joints are obtained by using MoSi2/316L graded material as the interlayer system when P=0.8, d=1.0 mm and n=9.
Key words: MoSi2; 316L stainless steel; joining; graded interlayer; residual stress
