激光熔覆三维温度场数值模型的建立与验证

综合考虑了激光熔覆热液施加，材料传热两方面的自身特点，建立了合理的激光熔覆数值模型，利用有限元法，通过计算模拟，结果表明：所得激光熔覆温度场模拟结果与实际测量情况吻合良好，从而证明了本文数值模型的正确性，为今后各种参数下激光熔覆的温度场模拟提供了一理论基础。

Numerical Simulation and Experiment of Temperature Field of Laser Cladding

In this paper, the three-dimensional temperature field of laser cladding is calculated through FEM. In FEM, the calculated workpiece can be divided into such elements as of different shape, size and thermal properties, so, the heat source and material conduction of laser cladding are fully embodied. In the aspect of heat source, heat flow input includes small area, high speed and uneven heat flow distribution; in the aspect of material conduction, it includes multilayer of different material and holy pre-coating. By FEM, various characteristics (surface tension, convection, mass transfer, fluid flow, metal vapor pressure etc.)are all investigated by proper processing. It has been shown that experimentally determined laser cladding pool shape is found to be in fair agreement with the corresponding theorectically calculated values. It would be possible, at least in principle, to adjust laser cladding parameters so as to achieve a desired combination of microstructure and mechnical properties.