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激光交叠热处理45#钢在交叠区有较大的硬度下降，本文从热传导方程出发，分析了激光热处理过程中的温度场分布，由此讨论后一道处理对前一道硬化带的重新加热过程，以及不同温度区域所产生的不同程度回人或淬火而导致的不同硬度值变化，分析了实验现象并提出解决问题的方法。
Laser overlapping heat treatment of 45 # steel in the overlap zone has a greater hardness decline, this paper, starting from the heat conduction equation, the analysis of the laser heat treatment process of the temperature field distribution, thus discussing the latter treatment on the previous hardening zone reheating process , And different temperature zones produced by different degrees of return or quenching caused by changes in the hardness of different values, analysis of the experimental phenomena and propose solutions to the problem.