TiC颗粒增强镍基合金激光熔覆工艺仿真

通过有限元分析方法对不同激光功率、扫描速率以及光斑直径下TiC/Inconel 718复合材料制造过程中的热-力学特征进行了研究。通过线性组分公式确定复合材料的热物理性能参数，选用半球高斯热源模拟激光温度载荷，利用生死单元技术实现金属粉末增材过程。采用间接法进行激光熔覆热-力耦合分析，基于温度分析结果转换单元类型进行热应力计算。研究表明个工艺参数与温度、温度变化率及残余应力的变化存在一定的规律，且激光加工功率在225～250 W之间、扫描速度在1.0～1.5 mm/s之间、光斑半径在2.5～3.0 mm之间达存在最佳加工参数，可以达到较好的熔覆效果。

Simulation of Laser Cladding Process of TiC Particle Reinforced Nickel Base Alloy

Thermal-mechanical characteristics of TiC/Inconel718 composites under different laser powers, scanning rates and spot diameters were studied by finite element method. The thermophysical properties of the composite were determined by a linear formula based on the mass rate of TiC to Inconel718. The hemispherical Gaussian heat source was used to simulate the laser temperature load, and the “birth and death element” technology was used to simulate the metal powder additive process. The laser cladding thermal-mechanical coupling effect was implemented by the indirect method, and the thermal stress was calculated based on the temperature analysis results by switching the element type. The result shows that the three process parameters have certain influence rules with the changed temperature, temperature rate and residual stress, and the optimal processing parameters which achieve good cladding effect lie in a laser power between 225 and 250 W, scanning velocity between 1.0 and 1.5 mm/s, and spot radius between 2.5 and 3 .0 mm.