期刊
METALS
卷 11, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/met11040619
关键词
laser-powder bed fusion; Inconel 625; electron backscatter diffraction (EBSD); X-ray diffraction (XRD); recrystallization; dislocation density
资金
- Banque Publique d'Investissement
The microstructural evolution during laser-powder bed fusion (L-PBF) process on Inconel 625 has been studied, with a focus on recrystallization and dislocation densities. Results show that high-energy conditions lead to earlier recrystallization due to higher density of geometrically necessary dislocations. However, lower energy densities result in better tensile properties for as-built specimens, with homogenized properties achievable through appropriate heat treatment.
The microstructures induced by the laser-powder bed fusion (L-PBF) process have been widely investigated over the last decade, especially on austenitic stainless steels (AISI 316L) and nickel-based superalloys (Inconel 718, Inconel 625). However, the conditions required to initiate recrystallization of L-PBF samples at high temperatures require further investigation, especially regarding the physical origins of substructures (dislocation densities) induced by the L-PBF process. Indeed, the recrystallization widely depends on the specimen substructure, and in the case of the L-PBF process, the substructure is obtained during rapid solidification. In this paper, a comparison is presented between Inconel 625 specimens obtained with different laser-powder bed fusion (L-PBF) conditions. The effects of the energy density (VED) values on as-built and heat-under microstructures are also investigated. It is first shown that L-PBF specimens created with high-energy conditions recrystallize earlier due to a larger density of geometrically necessary dislocations. Moreover, it is shown that lower energy densities offers better tensile properties for as-built specimens. However, an appropriate heat treatment makes it possible to homogenize the tensile properties.
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