摘要
综合考虑了激光熔覆热流施加、材料传热两方面的自身特点（在热源施加方面，激光熔覆是小面积、快速、分布不均匀的热流输入形式；在材料传热方面，激光熔覆是多层异质、预置涂层多孔非实质的材料传热方式），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。
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.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
1997年第2期58-62,共5页
Transactions of The China Welding Institution
关键词
激光熔覆
数值模拟
温度场
三维
laser cladding, numerical simulation, temperature field
