长脉冲与连续激光联合辐照铝合金的温度场仿真  

Temperature Flied Simulation on Aluminium Alloy Irradiated by Long Pulsed Laser and Continuous Wave Laser

作　　者：肖婧[1] 何衡湘[1] 夏惠军[1] 贾静[1] 

机构地区：[1]西南技术物理研究所,四川成都610041

出　　处：《中国激光》2012年第11期38-43,共6页Chinese Journal of Lasers

摘　　要：为了给长脉冲与连续激光联合作用模式的参数选择提供依据,采用ANSYS分析了长脉冲激光和连续激光共同辐照下2A12铝合金的温度场,得到了不同连续激光与长脉冲激光加载起始时刻的时间间隔和不同光斑半径组合情况下激光辐照中心点的最高温度和熔池的大小。结果表明,随着时间间隔的增大,激光辐照中心点的最高温度越高;当两束激光的时间间隔大于某特定值时,脉冲激光所造成的温升才会逐渐增加;激光辐照中心点的最高温度和熔池的大小主要由峰值功率较高的长脉冲激光决定,但是如果选择合适的连续激光预热,尤其是当连续激光的功率密度达到105W/cm2量级时,联合作用能显著增大熔池的尺寸,并适量提高辐照中心点的温度。Finite element analysis software ANSYS is used to simulate the temperature distribution of 2A12 irradiated by continuous wave （CW） laser and long pulsed laser. The effect of different intervals of time between the two beams on the maximum temperature of the center and the size of molten pool and the effect of different combinations of the two lasers＇ radiuses are investigated. The results show that the maximum temperature of the center increases by increasing the interval of time. The temperature rise induced by long pulsed laser increases when the interval of time is larger than one specific value. The maximum temperature of the center and the size of molten pool are mainly decided by the long pulsed laser which has a relatively higher peak power, the continuous wave laser used to preheat the material can significantly increase the size of molten pool when its power density is at 105 W/cm2 level.

关 键 词：激光技术 连续激光 长脉冲激光 铝合金 预热 温度场 熔池 

分 类 号：O532.25[理学—等离子体物理]