摘要
利用有限元法对脉冲激光毛化过程的温度场、应力场进行了数值模拟,研究了不同激光参数对表面温度场与应力的影响,计算并讨论了温度梯度的影响,数值计算结果通过实验进行检验。结果表明,激光功率对不同深度处点的最高温度和温度梯度有决定性的作用,深度方向的温度梯度远大于其它两个方向的温度梯度。另外,提高基体预热温度能降低毛化点表面的温度梯度,有效降低表面的残余应力。在激光毛化光路设计中,利用脉冲激光对毛化点进行预热非常有必要。温度与应力的计算结果与实验基本一致。
Laser texturing technology is a new way to produce textured roller, Wear property and operating life of the roller are greatly affected by stress condition of the textured surface, Numerical simulation of temperature and stress field of laser texturing process was studied with finite element method, The influence of different processing parameters on the temperature and stress field was investigated and the effect of temperature gradient was discussed, The simulation results were validated by the experiments, The results show that laser power plays dominant role for maximum temperature of the surface and temperature gradient over the depth, the temperature gradient in thickness direction is much larger than that in other two directions, In addition, improved preheated temperature of suhstrate can decrease the temperature gradient of the textured spot and the residual stress of the surface effectively, Thus, preheating the textured spot with laser beam in the design of optical path is important.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2008年第4期181-184,共4页
Transactions of Materials and Heat Treatment
基金
上海市光科技专项基金资助(05DZ22002)
关键词
激光毛化
温度场
应力
温度梯度
laser texturing
temperature field
stress
temperature gradient
