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在27SiMn钢表面激光熔覆铁基合金粉末,对激光熔覆成形过程中移动高斯热源作用下的温度场利用ANSYS有限元分析软件进行模拟,并建立了三维模型。进行单因素动态模拟,探讨了各工艺参数对温度场的影响。通过设计三水平三因素的正交试验来验证模拟结果的准确性。结果表明:熔池中心的温度最高。当扫描速度一定时,熔池内最高温度与激光功率成正比例关系;当激光功率不变时,激光扫描速度与熔池内最高温度成反比例关系;不同搭接率对熔池内的最高温度影响较为有限。不同时刻下的温度场激光移动热源中心前方的温度梯度大于激光移动热源中心后方的温度梯度。在激光熔覆过程中,当激光功率为2500 W,扫描速度在16 mm/s,搭接率为1/2时,可得到与基体具有良好冶金结合的熔覆层。
The surface of 27SiMn steel was laser cladding iron-based alloy powder, and the temperature field under the action of moving Gaussian heat source was simulated by ANSYS finite element analysis software and the three-dimensional model was established. Univariate dynamic simulation was carried out to investigate the influence of various process parameters on the temperature field. The accuracy of simulation results was verified by designing three levels and three factors of orthogonal experiment. The results show that: the highest temperature in the pool center. When the scanning speed is constant, the maximum temperature in the weld pool is directly proportional to the laser power. When the laser power is constant, the laser scanning speed is inversely proportional to the maximum temperature in the weld pool. The influence of different overlap rates on the maximum temperature in the weld pool is limited. The temperature gradient in front of the heat source center of the temperature field at different moments is greater than the temperature gradient behind the center of the laser heat source. In the laser cladding process, when the laser power is 2500 W, the scanning speed is 16 mm / s and the lap rate is 1/2, a cladding layer with good metallurgical bond with the matrix can be obtained.