1.College of Metallurgical Engineering, Xian University of Architecture and Technology, Xi’an 710055, China
2.School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Laser powder bed fusion is widely used in aerospace, medical and nuclear power fields. The forming process involves a variety of complex physical phenomena that have a great impact on the quality of components, also the exploration of material processing parameters is based on a large number of trial experiments with high cost and low efficiency. In order to solve the above problems, this paper proposes a mesoscopic physical model, the use of EDEM, Gambit and FLOW-3D software for discrete powder bed and powder melting during the laser powder bed fusion forming process for mesoscopic temperature field simulation, explore the influence of scanning speed on the temperature field. The influence of the morphology and size of the molten pool clarifies the evolution of the temperature field. The results show that under the laser power P=215 W, the scanning speed V=900 mm·s-1 is the optimal process parameter, the melting channel is relatively straight and uniform, the necking and spheroidization defects are the least obvious, and there is no phenomenon that adversely affects the quality of components such as splashing and overmelting during the forming process. The model was verified by experiments, and good consistency was obtained. The simulation results can provide some theoretical support for the exploration of process parameters in the process of laser powder bed fusion.