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Numerical simulation of the three-dimensional temperature field in laser cladding forming process

机译：激光熔覆形成过程中三维温度场的数值模拟

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摘要

Laser cladding forming (LCF) is a new developed advanced manufacturing technology integrating rapid prototyping manufacturing and laser cladding surface modification. Since three dimensional near-net-shape metal components can be directly manufactured without dies, it has an extensive application prospect. Three-dimensional finite element model of powder-delivery transient temperature fields in LCF has been set up and numerical simulation has been carried out with parametric programming methods. Through the simulation, the temperature-time history curves, temperature field distribution, cooling rate and the temperature gradient of the laser cladding forming process have been obtained. The influences of laser power and scanning speed on the temperature gradient and cooling rate of the cladding layers have been studied, which provided a theoretical basis for the explanation of microstructure forming mechanism, cracking sensitivity and parameter selection. At the same time, LCF experiments have been conducted with parameters obtained from the simulation, microstructure of the cladding layers have been analyzed combining with the results of numerical simulation. Defect free laser cladding forming components with fine and homogeneous microstructure have been obtained with optimized parameters.
机译：激光熔覆成型（LCF）是一项新开发的先进制造技术，集快速原型制造和激光熔覆表面改性于一体。由于无需模具即可直接制造三维近净形金属部件，因此具有广阔的应用前景。建立了LCF中粉末输送瞬态温度场的三维有限元模型，并通过参数化编程方法进行了数值模拟。通过仿真，获得了激光熔覆成形过程的温度-时间历史曲线，温度场分布，冷却速率和温度梯度。研究了激光功率和扫描速度对熔覆层温度梯度和冷却速率的影响，为解释显微组织形成机理，裂纹敏感性和参数选择提供了理论依据。同时，利用从模拟中获得的参数进行了LCF实验，结合数值模拟结果对包层的微观结构进行了分析。通过优化的参数获得了具有精细且均匀的微观结构的无缺陷激光熔覆成型部件。

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