本文对AISI1045钢在均匀、矩形的强激光光束下,以等速移动所进行的相变硬化作了热分析。采用三维导热方程进行数学分析,计算出在给定的光斑大小、输出功率和扫描速度下的加热温度,加热和冷却速度以及表面硬化层的厚度。测定了经激光相变硬化处理后钢的残余应力的大小和分布,以及应变条件下的疲劳性能和磨损速率。 In this paper, the thermal analysis of AISI1045 steel under phase change hardening under uniform and rectangular laser beam with constant velocity is carried out. Mathematical analysis was conducted using a three-dimensional heat conduction equation to calculate the heating temperature, the heating and cooling rates, and the thickness of the surface hardened layer at a given spot size, output power and scanning speed. The size and distribution of the residual stress of the steel after laser transformation hardening were measured, and the fatigue property and wear rate under the strain condition were measured.