4.7 Article

A comparative study on laser powder bed fusion of IN718 powders produced by gas atomization and plasma rotating electrode process

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.143589

Keywords

Laser powder bed fusion; Inconel 718 (IN718); Powder feedstocks; Processing window; Material microstructures; Mechanical properties

Funding

  1. National Natural ScienceFoundation of China [52074157]
  2. Shenzhen Science and Tech-nology Program [JCYJ20210324104608023, JSGG20210802154210032, KQTD20170328154443162]

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This paper compared the application of IN718 powders prepared by gas atomization (GA) and plasma rotating electrode process (PREP) in LPBF process. The results showed that the PREP powder had better flowability and processing window, and could achieve more stable mechanical properties compared to the GA powder.
The effects of powder feedstocks prepared by different methods on the processibility of the powders and the performance of final components have largely been unexplored in metal additive manufacturing (MAM). In this paper, we conducted a comparative study on the laser powder bed fusion (LPBF) process of Inconel 718 (IN718) powders produced by gas atomization (GA) and plasma rotating electrode process (PREP), respectively. For the GA and PREP powders, the powder characteristics, such as chemical composition, particle size distribution (PSD), powder morphology and powder defects are initially characterized and compared. Parallel single-track experiments and cuboid components printing have also been designed and carried out in the LPBF process by using these two types of powders. Forming quality and mechanical properties of different components are sys-tematically evaluated. The results show that the powder feedstocks do not significantly affect the mechanical properties under the optimized LPBF process parameters. However, the PREP powder, with smooth surface, higher sphericity, higher apparent density and better flowability, can obtain a larger processing window and more stable mechanical properties of the as-built parts than the GA powder.

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