中文摘要：

采用商业有限元软件ProCAST,建立了激光相变硬化温度场的3维数值模拟模型,对球墨铸铁QT600-3进行激光相变硬化的数值模拟研究,计算了表面淬火的温度场,根据温度场预测了硬化层的深度和宽度。激光功率在800～1 000 W之间,激光扫描速度在2.000～2.667 mm/s之间,光斑直径在4～5 mm之间时,计算得到的硬化层深度在0.20～0.64 mm之间,硬化层宽度在2.0～3.7 mm之间。球墨铸铁数值模拟结果与试验基本吻合,两者变化趋势一致。

英文摘要：

A 3-D numerical model of the temperature field for the laser transformation hardening was created based on finite element software ProCAST.The temperature field of the laser transformation hardening of ductile cast iron QT600-3 was calculated.According to the temperature field,the depths and widths of the hardened band were predicted.When the laser power ranged from 800 W to 1 000 W,the scan velocity ranged from 2.000 mm/s to 2.667 mm/s,and the diameter of laser beam ranged from 4 mm to 5 mm,The depths of the hardened distribute between 0.20 mm and 0.64 mm as well as the widths distribute between 2.0 mm and 3.7 mm.The depths and widths of the hardened band rises with increase in laser power or decrease in laser scanning velocity.It was found that the numerical simulated results was similar with the experimental results,and the both changed in the same trend.