中文摘要：

对17-4PH不锈钢进行激光固溶与激光合金化的同步复合强化处理，通过优化复合强化的工艺参数可以提高材料的综合性能。为此，利用ANSYS软件建立有限元模型，对复合强化过程的温度场进行模拟，分析了激光光斑尺寸、功率以及激光固溶、合金化两个光斑之间的距离对温度场的影响。模拟结果表明：在扫描速度一定的情况下，随着固溶光斑与激光功率的增大，固溶深度增加；当固溶光斑尺寸为8mm×10mm时，激光的热作用效率最高：当激光固溶光斑与激光合金化光斑之间的距离大于50mm时，固溶光斑对于合金化光斑的热作用几乎没有影响。

英文摘要：

Synchronous hybrid strengthening of 17--4PH stainless steel by laser solid solution and laser alloying, through optimizing the process parameters of the technique, can improve the comprehensive performance of the material. The ANSYS software was utilized, and the finite element model was established to simulate the temperature field of 17--4PH stainless steel by laser solid solution and laser alloying synchronous hybrid strengthening in this paper. The influences of the laser spot, power and the distance between the solid solution laser spot and the alloying laser spot on the temperature field were studied. The simulation results show that, under a certain scanning speed, with the increases of the spot size of the laser solid solution and the laser power, the solid solution depth increases, There are the highest efficiency of the laser thermal effect when the size of the solid solution spot is 8 mm×10 mm. When the distance between the laser solid solution spot and the laser alloying spot is greater than 50 mm, the laser solid solution spot has almost no impact on laser alloying spot.