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为描述预置粉Nd:YAG激光熔覆过程中温度场的变化规律,建立了三维预置粉激光熔覆物理模型,通过自行编程,利用三维表格施加高斯激光热流密度载荷,实现载荷的空间分布与时间移动,在ANSYS软件中模拟计算了预置粉Nd:YAG激光熔覆过程温度场。模拟结果表明光斑中心处温度最高,为2.8×10~3℃,并以光斑为中心逐层降低,等温线近似椭圆形,椭圆中心位于光斑后方。光斑点的升温变化率、降温变化率、热梯度分别为7×10~3℃/s、5×10~3℃/s、2×10~6W/(m~2·s)。这些结果数据为激光熔覆工艺参数的优化提供了理论依据。
In order to describe the variation law of the temperature field during the laser cladding of prefilled Nd: YAG laser, a physical model of prefilled laser cladding was set up. By means of self programming, Gaussian laser heat flux density was applied by three-dimensional table to realize the spatial distribution of load With the time moving, the temperature field of the prefilled Nd: YAG laser cladding process was simulated in ANSYS software. The simulation results show that the temperature at the center of the spot is the highest, which is 2.8 × 10 ~ 3 ℃, and decreases with the spot as the center. The isotherm is nearly oval with the center of the ellipse behind the spot. The temperature change rate, the temperature change rate and the thermal gradient of light spot are 7 × 10 ~ 3 ℃ / s, 5 × 10 ~ 3 ℃ / s, 2 × 10 ~ 6W / (m ~ 2 · s) respectively. These results provide the theoretical basis for the optimization of laser cladding parameters.