脉冲次数对毫秒激光作用下织构形貌的影响  

Effect of Pulse Times on Texture Morphology under Millisecond Laser

作　　者：陈诚 华希俊[1] 朱东坡 许晟 解玄 Chen Cheng;Hua Xijun;Zhu Dongpo;Xu sheng;Xie xuan(School of Mechanical Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;School of Automotive and Transportationn Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013 [2]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《激光与光电子学进展》2021年第17期309-316,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51975252);镇江市重大科技专项(ZD2018001);镇江市高技术研究重点实验室项目(SS2018007)。

摘　　要：为了探究多脉冲在毫秒激光作用下织构形貌的演变规律,本文建立一个二维对称模型,考虑反冲压力、表面张力和蒸发速度对熔池变化的影响,用来分析形貌演变的规律并对其进行实验验证。研究结果表明,在反冲压力的作用下,凹坑深度和凹坑直径随着脉冲次数的增加而增大;熔池中心凸起和边缘凸起的形成与热毛细力和拉普拉斯压力有关,并且随着脉冲次数的增加,熔池中心的凸起高度减小;熔池边缘处,在热毛细力的影响下熔质向中心流动,并且随着脉冲次数的增加,边缘凸起的高度减小。In order to explore the evolution law of the texture morphology under the action of multi-pulse millisecond laser,a two-dimensional symmetric model is established in this paper,which considered the influence of recoil pressure,surface tension,and evaporation rate on the change of molten pool,and is used to analyze the evolution law of the texture morphology and carry out experimental verification.The results show that under the action of recoil pressure,the depth and diameter of the pit increase with the increase of the number of pulses.The central bulge and the edge bulge are related to the thermal capillary force and Laplace pressure,and the height of bulge decreases with the increase of the number of pulses.At the edge of the molten pool,the molten material flows to the center under the influence of the thermal capillary force,and the height of the edge bulge decreases with the increase of the number of pulses.

关 键 词：激光光学 激光技术 形貌演变 熔池流动 蒸发速度 反冲压力 

分 类 号：TN249[电子电信—物理电子学]