【摘要】 用热传导方程控制激光辐照温度,建立了一种新回归方程以控制激光辐照硬化深度,选用卡尔丹公式列热传导方程及同归方程联立求解,可得到同时满足一定的硬化深度及表面最高温度双重要求的工艺参数,此种方法可作为激光硬化处理工艺参数的控制或预报,对本合金铸铁的激光硬化处理,其表面温度的下限应大于其熔点温度,即以表面产生微熔的快速冷凝处理为宜,并以选取低功率慢扫描为最佳。更多还原

【Abstract】 Both of the surface microstructure and the hardening depth are important characteristics of laser hardening treatment. The equation of regression representing the relationship among the power density q, radiation time T and the interaction qt T for the hardening depth is obtained as follows: The equation included the effect of the highest surface temperature.lt is indicated that the highest surface temperature is the decisive factor to determine surface microstructure and the radiation time is the decisive factor to determine the hardening depth. Laser treatment with low-power irradiation and slow-scanning speed is suitable for cast iron. The power density and radiation time can be determined by means of heat transport and the equation of regression with a formula of Cardann at a given highest surface temperature and a hardening depth.更多还原