Research Status of Numerical Simulation of Laser Melting Deposition
CUI Zhaoxing1,2, DONG Shiyun2, HU Xiaodong1, YAN Shixing2, JIANG Haoyong1
1 School of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China 2 National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China
Abstract: Laser melting deposition(LMD) technology has become an effective method for repairing parts and fabricating large size components due to its high efficiency, low cost and excellent parts performance. However, metal LMD forming is a multi-factor coupling process of the interaction of metal powder, laser beam and substrate, involving flow molten pool, rapid non-equilibrium solidification, solid phase transformation, and complex temperature and thermal stress evolution. So predicting the molten pool flow, solidification law and temperature stress evolution law is of great significance for the control of defects such as pores and cracks in shaped samples, and the microstructure, mechanical properties and stress and deformation control. Numerical simulation is an economical and fast tool, which is of great significance for prediction of powder flow, molten pool change, microstructure, temperature observation, and residual stress and deformation after cooling in the LMD forming process. In recent years, the LMD numerical simulation research has involved the above aspects, but the research depth is different. Aiming at the study of the temperature field, diffe-rent pyrogen models were established to discuss the temperature evolution of the deposition process and the influence of the process plan. Aiming at the research of stress field, the influence law of process plan and stress relief method are the main directions. The flow field research is dominated by molten pool flow and powder flow. The microstructure simulation considers the influence of the flow of the molten pool on the macroscopic temperature field and the shape of the molten pool. The growth conditions of directional solidification can be used to determine the solidification information such as the primary spacing of dendrites. This paper summarizes the research status of numerical simulation of metal laser melting deposition from the aspects of temperature field, stress field, flow field, microstructure, etc., and puts forward the existing problems and the direction of pre-development.
崔朝兴, 董世运, 胡效东, 闫世兴, 姜浩涌. 激光熔化沉积成形过程数值模拟研究现状[J]. 材料导报, 2022, 36(2): 20040221-6.
CUI Zhaoxing, DONG Shiyun, HU Xiaodong, YAN Shixing, JIANG Haoyong. Research Status of Numerical Simulation of Laser Melting Deposition. Materials Reports, 2022, 36(2): 20040221-6.
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2022, Vol. 36 
