激光熔覆过程中单个颗粒温升的解析公式

Analytical Formula of Temperature Rise of Single Particle in Laser Cladding Process

提出了激光熔覆过程中单个粉末颗粒温升的解析公式,该公式考虑了粉末颗粒的固液相变及颗粒材料热物性参数随温度的变化。通过具体算例验证了考虑粉末颗粒固液相变的必要性以及发展公式的有效性。考虑和未考虑相变计算的单个颗粒的温度结果相差超过200℃。将应用发展公式预测结果与已有的仿真结果进行对比,结果表明:直径为85、75和55μm的颗粒,两个结果的相对误差分别为5.5%、5.3%和11.6%。研究结果为激光熔覆及增材过程中颗粒温升的精确计算提供了理论参考。

An analytical formula for the temperature rise of single powder particle in the process of laser clad-ding is proposed.The formula takes into account the solid-liquid phase transition of powder particles and the variation of thermophysical parameters of the materials with temperature.A specific example is given to show the necessity of considering the solid-liquid phase transition of powder particles and the effectiveness of the developed formula.The calculation results show that the temperature difference between the single particle with and without phase transition is more than 200℃.At the same time,the existing simulation results are compared with the prediction results by using the developed formula in this paper.The results show that for the particles with diameters of 85,75 and 55μm,the relative errors of the two results are 5.5%,5.3%and 11.6%,respectively.The research work of this paper provides a theoretical reference for the accurate calcula-tion of particle temperature rise in the process of laser cladding and additive manufacturing.