脉冲激光辐照金属材料表面瞬态温度场研究

Research on Transient State Temperature Field of the Surface of Metal Material under Pulsed Laser Radiation

建立了脉冲激光辐照金属材料表面的热学模型,通过拉普拉斯变换法求解了热传导方程,得出金属材料在激光辐照下加热和冷却过程瞬态温度场分布的精确解析解。基于Visual C++编程并实现界面化,实现对于具体材料激光辐照下瞬态温度场的预测和分析。并以纯铝的激光熔覆和镁合金的激光熔凝实验为例,验证了瞬态温度场的分布。结果表明,金属材料在一个脉冲时间内温度随激光辐照时间的增加而升高,辐照结束后,表面温度迅速下降,内部温度下降较慢。分析结论与相关实验结果基本吻合,证实了所建模型的合理性。该结论对其它激光表面处理过程具有一定的指导作用。

A calorifics model of pulse laser radiation to metal material surface is established and the thermal conducting equation was solved through Laplace transforming,receiving the precise analyse result of transient state temperature field distributed under heating and cooling process of laser irradiation to metal material. Based on Visual C＋＋ programme,interface living window was set up,realizing the transient temperature field forecast and analysis of laser radiation to materials by feeding with different parameters. Taking pure aluminum of laser alloying and magnesium alloy of laser remelting as examples verified the distributing of transient state temperature field. The results show that the temperature of metal material within a range of pulse time will increase with time,after radiating,the surface temperature will drop fast but the internal temperature decreases slowly. The analysis results are almost in agreement with experiment result,verifying the rationality of the established model. The results can taken as basic guidance to develop laser surface treatment.