为了实现复杂形状工件的表面强化，以电磁场和温度场的控制方程为基础，在ANSYS中建立了多道次点式连续移动感应淬火的有限元模型。通过改变各个道次之间感应器移动轨迹的重叠宽度，对多道次连续移动感应淬火过程进行了数值模拟研究，得到了重叠宽度对多道次淬火区域温度场分布和组织转变规律，并通过金相实验验证了模拟结果的可靠性。结果表明当轨迹的重叠宽度大于一定值时，后一道感应加热过程会使得前一道已淬火区域部分发生奥氏体转变，且由于存在热积累效应，后一道轨迹相比前一道轨迹的完全奥氏体化深度和部分奥氏体化深度会有一定程度的增加。

To realize the surface hardening of complicated components, a numerical model for multipass spot continual induction hardening (MPSCIH) was built in finite element software ANSYS, based on the nonlinear partial differential equation for electromagnetic and temperature fields. The overlapping width between adjacent tracks was considered during the numerical analysis of MPSCIH process and the influence of the overlapping width on temperature distribution and microstructure transformation was obtained. The numerical results were validated by metallographic analysis. The results show that if the width of the overlapping region is over a certain value, the austenitic transformation will appear in the former hardened track when subsequent induction heating is carried out on the next track. Because of the heat accumulation effect in the MPSCIH process, the complete and the partial anstenitizing depths of the latter track are larger than those of the former track.