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应用激光扫描来硬化直径为300mm 的大活塞环是继续开发和应用激光热处理技术又一项成功的尝试。所谓活塞环激光硬化,就是利用激光具有高功率密度的性质,由激光器发射定向光束作为热源,对活塞环(合金铸铁)局部进行扫描加热,并通过自身的热传导获得迅速冷却,从而使受热区的金相组织与性能产生变化的一种热处理工艺。事实说明,它赋予活塞环很多优良的特性。1)扫描后所形成的硬化带是由熔化区(位于带的中间)和相变区(在熔化区周围)组
The application of laser scanning to harden a large piston ring with a diameter of 300 mm is another successful attempt to continue developing and applying laser heat treatment technology. The so-called piston ring laser hardening, the laser is the use of high-power density of the nature of the laser beam emitted by the directional beam as a heat source, the piston ring (alloy cast iron) local scanning heating, and through its own heat conduction to obtain rapid cooling, so that the heated zone Metallographic structure and properties of a heat treatment process changes. The fact that it gives the piston ring many excellent features. 1) The sclerosis zone formed after scanning is composed of a melting zone (in the middle of the belt) and a phase change zone (around the melting zone)