中国激光, 2002, 29 (s1): 582, 网络出版: 2013-02-23  

激光在圆柱形工件上产生的热场和激光淬火模拟

Modelling of Thermal Field Induced by Laser on the Surface of Cylinder
作者单位
1 昆明理工大学材料与冶金工程学院材料系, 昆明 650093
2 巴黎高等机械工程学院(ENSAMde Paris,FRANCE)
摘要
运用差分法建立了圆柱体表面激光产生热场的计算, 对不同的激光分布进行了模拟研究,给出了不同尺寸 圆柱形物体的热场模拟,结果表明, 激光在圆柱体、管状物体上产生的热场与激光分布形式、圆柱体半径大小有关, 在圆柱体半径较小(或管状物半径较小、壁厚较薄)时,激光热处理的自冷却条件不成立。在模拟的同时,用相关尺寸的圆柱形和圆管形试样进行了热处理研究, 试验结果和模拟结果进行了比较,充分肯定了模拟结果的正确性。同时,从模拟结果和实验结果的误差分布可以看出,激光热处理时,如果吸收层的不稳定会带来模拟和试验控制的困难,因此,除了研究模拟问题外,必须解决激光在试样表面的稳定吸收问题,否则,模 拟结果和实验结果是不可预计的。
Abstract
The finite difference method was used to calculate the thermal field induced by laser beam with different power repartitions on the surface of cylindrical body with different radius. It shows that the induced thermal field is related to the laser repartition as well as radius of cylinders. It is important to note that there is a critical radium for a cylinder to be self-quenched by a laser beam. Otherwise, the assisted cooling will be inevitable. For the tubes, the same scene happens when a critical radium and thickness is reached. The experiments were performed to verify the validity of the modelling. Comparison between experiments and theoretical calculation confirms the validity of the finite difference calculations. It is evident that the absorption at the surface is also an important factor in the laser heat treatment. Therefore the appropriate method of modelling as well as the stable absorption is the key to predict the laser induced thermal effects.

陈庆华, RAISSI Kadour, VAGLIO Patrick, DEVOT Katy. 激光在圆柱形工件上产生的热场和激光淬火模拟[J]. 中国激光, 2002, 29(s1): 582. CHEN Qing-hua, RAISSI Kadour, VAGLIO Patrick, DEVOT Katy. Modelling of Thermal Field Induced by Laser on the Surface of Cylinder[J]. Chinese Journal of Lasers, 2002, 29(s1): 582.

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