快速轴流CO_2激光器激光相变硬化处理HT250的研究

Study on Laser Phase Transformation Hardening of HT250 by High Speed Axis Flow CO_2 Laser

用快速轴流CO2 激光器对HT2 5 0进行激光相变硬化处理 ,优化出处理HT2 5 0所需的合理工艺参数匹配 ,并从硬化带尺寸、微观组织形态、硬化带内硬度分布等方面分析了快速轴流CO2 激光器进行激光相变硬化处理过程中 ,工艺参数对硬化区的影响 ;实际试验证明只要工艺参数选取适当 ,轴流激光器也可用于热处理 ;实验中发现当用某些参数处理材料时 ,由于表面张力的作用 ,试样的表面精度有所提高。根据试验结果拟合出所有工艺参数中两个最重要参数 :激光功率密度 q ,激光扫描速度V 的关系曲线 。

In this article, laser phase transformation hardening of HT250 material by high speed axis flow CO 2 laser is investigated. Appropriate laser hardening parameters, such as laser power P (W),laser scanning rate V (m/min), have been optimized through a number of experiments. The effects of the parameters on the hardened zone, including case depth, micro hardness distributions etc. are analyzed. The experiment shows that the axis flow CO 2 laser, which commonly outputs low mode laser beam, also can heat treat materials as long as the treating parameters used are rational. During the experiments, the surface qualities of the specimens treated with optimized parameters were enhanced, which incoincided with former results. According to the experimental results, the relation between the optimized parameters, the laser power densities q and the scanning rates V is given.