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一引言近年来,由于大功率激光器的出现,使得激光在金属加工工业中得到了很大的应用。激光表面处理即为其中的应用之一,但其发展只有十多年左右,所以还有许多理论和实际问题没有解决。激光表面处理的应用也有待进一步开发。激光相变硬化是一种新型的金属表面热处理方法。由于它采用高能量密度的激光束作为热源加热金属表面,又依靠金属自身的高导热性进行冷却淬火,所以它具有许多一般表面热处理所没有的优点:加热速度和冷却速度快,可达10~5K/S;处理后零件变形小,仅为感应加热处理的1/5～1/10;可对零件
An introduction In recent years, due to the emergence of high-power laser, making the laser in the metal processing industry has been a great application. Laser surface treatment is one of the applications, but its development has only ten or so years, so there are still many theoretical and practical problems that have not been solved. The application of laser surface treatment also needs further development. Laser phase transformation hardening is a new method of heat treatment of metal surfaces. Because of its high energy density laser beam as a heat source to heat the metal surface, but also rely on the metal’s own high thermal conductivity for cooling and quenching, so it has many advantages not available in general surface heat treatment: heating speed and cooling speed, up to 10 ~ 5K / S; treated parts deformation is small, only induction heating treatment 1/5 ~ 1/10; parts