铁/镍元素粉末的选区激光熔化过程扩散动力学研究

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Abstract Heterogeneous powder 3D printing technology uses mixed powder of pure element or simple alloy as raw material. It can omit the melting and milling process, complete the metallurgical process directly during printing. Compared with traditional 3D printing method, it can be one of the most important directions in the future as the production process is greatly shortened and the type of metal powder is dramatically reduced. This article proposed the technical principal on SLM process of heterogeneous metal powder. The feasibility of the technology was confirmed by diffusion simulation of Fe-based alloy systems during their molten state. The results show that the improvement of element diffusion efficiency and the composition homogenization can be achieved substantially by increasing the laser peak temperature, extending the melting time, reducing the size of metal powder and adding a subsequent high-temperature heat treatment. The results of SEM and EDS experiments show that the diffusion efficiency can be improved significantly by increasing the laser peak temperature and extending the melting time, which is consistent with the calcula-ted results.

Key words： selective laser melting diffusion dynamics heterogeneous powder 3D printing

Published: 01 July 2020

CLC number:

TB3

About author:: Chenqing Li graduated from Shanghai Jiaotong University in June 2017 with a bachelor degree in engineering. He studied at Central Iron & ; Steel Research Institute from September 2017 to present, mainly engaged in the research of 3D printing thermodynamic calculation of low alloy steel ; Hang Su born in 1969, and obtained his Ph.D. degree from the Shanghai Institute of Metallurgy, Chinese Academy of Sciences (now known as Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences) in 1997. He is currently a professor-level senior engineer and doctoral supervisor at the Central Iron & ; Steel Research Institute (CISRI), enjoying the special allowance from the State Council. He is also the deputy director of the Engineering Steel Institute of CISRI, and the executive director of the Computational Materials Subcommittee of the Chinese Society for Metals (CSM). His team research covers special materials in the fields of military ships, offshore equipment, petrochemical containers, high-speed railways, power grids. At the same time, he is committed to the research of material thermodynamics, material dynamics simulation, material database and other related technologies. He has published 2 monographs, 5 software copyrights, more than 10 patents, and more than 50 papers.

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	LI Chenqing
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Cite this article:

LI Chenqing,HOU Yaqing,SU Hang, et al. Diffusion Dynamic Analysis on Selective Laser Melting Process of Fe/Ni Powder[J]. Materials Reports, 2020, 34(Z1): 370-374.

URL:

http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2020/V34/IZ1/370

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