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建立了复合涂层激光熔池三维准稳态流场及温度场的数值模型 ,计算出熔池温度分布和速度分布及几何形状。分析了激光功率对熔池温度场、流场及形状的影响。计算结果表明 ,对于厚度为 0 .0 8mm的Ti Al( 30 % )复合涂层系统 ,功率为 750W时 ,复合涂层没有熔化 ,但Al基材产生熔化 ;功率为 140 0W时 ,在不同材料层内形成上下两个分离的熔池。复合涂层先熔化还是Al基材先熔化 ,依赖复合涂层厚度。激光重熔实验确认了分离熔池的存在 ,同时计算结果和实验结果基本吻合。
The numerical model of three-dimensional quasi-steady flow field and temperature field in laser cladding was established, and the temperature distribution, velocity distribution and geometry of the pool were calculated. The influence of laser power on the temperature field, flow field and shape of the molten pool was analyzed. The calculated results show that for the TiAl (30%) composite coating system with a thickness of 0.08 mm, the composite coating does not melt but the Al substrate melts at a power of 750 W. When the power is 140 0 W, Layers formed up and down two separate pool. The composite coating melts first or the Al substrate melts first, depending on the thickness of the composite coating. Laser remelting experiments confirmed the existence of separation of the molten pool, while the calculated results and experimental results are basically consistent.