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利用ANSYS软件,建立了三维瞬态激光扫描过程的温度场有限元模型,利用APDL语言实现热源的移动,对65Mn钢板激光扫描过程进行数值模拟,研究不同工艺参数扫描后钢板温度场的变化规律,并对比了不同功率和不同扫描速度对温度场和变形量的影响。结果表明,随着热源的移动,温度场呈现狭长椭圆形分布,且激光光斑前缘温度梯度大,后部温度梯度小;在相同激光功率700 W下,扫描越慢,65Mn钢板表面温度最大值越大,扫描速度为6 mm/s时,表面温度最高值为495.434 K;在相同扫描速度6 mm/s下,扫描功率越大,65Mn钢板表面温度最大值越大,当扫描功率为1100 W时,该最大值为611.024 K。为验证模拟计算结果,对65Mn钢板进行实际激光扫描试验,试验值与模拟值吻合良好。
The finite element model of temperature field in the process of three-dimensional transient laser scanning was established by using ANSYS software. The heat source movement was realized by using APDL language. The laser scanning process of 65Mn steel was numerically simulated and the variation law of the temperature field of the steel after scanning different process parameters was studied. The effects of different powers and different scanning speeds on temperature field and deformation are compared. The results show that with the movement of heat source, the temperature field shows a long and narrow elliptical distribution with a large temperature gradient at the leading edge of the laser spot and a small temperature gradient at the back. Under the same laser power of 700 W, The maximum surface temperature is 495.434 K when the scanning speed is 6 mm / s. The greater the scanning power is at the same scanning speed of 6 mm / s, the larger the maximum surface temperature of the 65 Mn steel is. When the scanning power is 1100 W The maximum is 611.024 K. In order to verify the simulation results, the actual laser scanning test was carried out on 65Mn steel plate. The experimental values agree well with the simulated values.