Journal
MATERIALS CHARACTERIZATION
Volume 200, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2023.112897
Keywords
Metals and alloys; Laser processing; Dislocations; Microstructure
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The effects of annealing on the microstructure of pure Ni fabricated by laser powder bed fusion (LPBF) were studied using Gaussian and flat-top beam profiles. The initial as-fabricated samples had a predominantly arrangement of statistically stored dislocations. The as-annealed specimens showed minimal static recrystallization, despite the high dislocation density in the as-fabricated samples. However, both types of specimens showed static recovery, with the Gaussian-LPBF-derived specimens exhibiting more prominent misorientation of dislocation boundaries.
The effects of annealing on the microstructure of pure Ni fabricated by laser powder bed fusion (LPBF) were investigated using two different beam profiles: Gaussian and flat-top. The dislocations in the as-fabricated samples were predominantly arranged as statistically stored dislocations, and the low driving force resulting from the insufficient accumulation of geometrically necessary dislocations (GNDs) in the as-fabricated specimens caused minimal static recrystallization in the as-annealed specimens, despite the high dislocation density in the as-fabricated samples, particularly the Gaussian-LPBF-derived specimens. However, static recovery occurred in both the Gaussian-LPBF and flat-top-LPBF-derived specimens, with the higher number of GNDs in the former specimens causing a more prominent misorientation of dislocation boundaries than in the latter. Furthermore, migration of high-angle grain boundaries (HAGBs; misorientation >15 degrees) was not observed because of the insufficient strain gradient and the distribution of HAGBs in low-energy regions.
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