High-temperature microstructural stability of pure Ni fabricated by laser powder bed fusion using Gaussian and flat-top beam profiles

被引：16
作者：
Jodi, Dennis Edgard [1 ,2 ]
Kitashima, Tomonori [1 ,3 ]
Singh, Alok [1 ]
Watanabe, Makoto [1 ]
机构：
[1] Natl Inst Mat Sci, Res Ctr Struct Mat, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan
[2] Kyushu Univ, Dept Mat Phys & Chem, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan
[3] Kyushu Univ, Dept Mat, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan
来源：
MATERIALS CHARACTERIZATION | 2023年 / 200卷
基金：
日本科学技术振兴机构;
关键词：
Metals and alloys; Laser processing; Dislocations; Microstructure; INCIDENTAL DISLOCATION BOUNDARIES; EVOLUTION; RECRYSTALLIZATION; CHARACTER; DENSITIES; ORIGIN; EBSD;
D O I：
10.1016/j.matchar.2023.112897
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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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页数：16
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