激光表面淬火技术具有高效、高质量、绿色环保的优点, 广泛应用于工业生产之中。为避免相邻两道激光之间回火区域的特性对淬火质量的影响, 利用有限元仿真分析的方法对H13钢高温回火区特性进行分析, 找出激光扫描速度、光斑大小、激光功率以及相邻两道激光的搭接率对高温回火区特性的影响。研究表明, 硬化层有效深度由二次淬火区深度决定, 二次淬火区和硬化层宽度随着激光功率、搭接率的增加而增加, 与光斑直径、光斑扫描速度呈相反趋势变化。通过实验对分析的结论进行了验证, 结果表明, 分析得到的数据和实验得到的数据变化趋势相同, 在边界条件比较精确的条件下, 可以用数值模拟的方法分析工件激光表面淬火工艺。

Laser surface quenching technology has been widely used in industry production because of its advantage of high efficiency, high quality and environmental protection. In order to avoid the influence of the characteristics of the tempering zone between two adjacent lasers on the quenching quality, using finite element simulation analysis to find the effect of laser scanning speed, spot size, laser power and lap ratio of two adjacent lasers on the characteristics of the high temperature tempering zone. The study shows that the effective depth of hardened layer is determined by the depth of the secondary quenching zone, the width of the secondary quenching zone and hardened layer increases with the increase of the laser power and overlap ratio, and inversely proportional to spot diameter and spot scanning speed. The results of the analysis are verified by experiments. The results show that the data obtained from the analysis and from the experiment have the same variation trend, under more precise boundary conditions, the numerical simulation method can be used for the analysis of workpiece laser surface quenching process.