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根据激光熔覆生物陶瓷涂层的特点,选择二维带状热源模型,研究计算了材料物理性能在不同温度下的变化曲线,并建立温度场模型。将实验制备的涂层从涂层外观、显微硬度、涂层与基体的结合强度、涂层物相等方面对比模拟结果与实验结果,从而论证模型的可靠性。根据模拟结果可得:激光功率与扫描速度均会影响熔池深度,且激光功率的影响大于扫描速度;根据模拟的变化趋势分析,选择的激光熔覆的工艺参数为功率P=1700 W,扫描速度V=165 mm/min。模拟预测了不同涂层厚度、工艺参数条件下的熔池深度。
According to the characteristics of the laser cladding bioceramic coating, a two-dimensional ribbon heat source model is selected, the change curve of the physical properties of the material at different temperatures is calculated and the temperature field model is established. The experimentally prepared coating is compared with the simulation results and the experimental results from the coating appearance, the microhardness, the bonding strength of the coating and the substrate, and the coating equal, so as to demonstrate the reliability of the model. According to the simulation results, both the laser power and the scanning speed will affect the depth of the molten pool, and the influence of the laser power is greater than the scanning speed. According to the simulation trend analysis, the selected laser cladding process parameters are power P = 1700 W, Speed V = 165 mm / min. The simulation predicts the depth of pool under different coating thickness and process parameters.