Liqun Kuai, Gan Lu, Jinzhong Lu, Kaiyu Luo. Mechanism of Isotropic Enhancement of Selective Laser Melted 316L Stainless Steel Under Different Build Directions by Annealing Heat Treatment[J]. Laser & Optoelectronics Progress, 2024, 61(23): 2314011
- Laser & Optoelectronics Progress
- Vol. 61, Issue 23, 2314011 (2024)
Fig. 1. Test results. (a) Powder SEM image; (b) size distribution statistics of powder particle; (c) SLM scanning strategy; (d) SLM process flow; (e) diagram of specimens with different build directions; (f) size of tensile specimens
Fig. 2. Microhardness values of all specimens. (a) 750 ℃; (b) 850 ℃; (c) 950 ℃
Fig. 3. Engineering stress-strain curve of all specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 4. Elongation-ultimate tensile strength-yield strength of all specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 5. Microscopic photograph of tensile fracture micrographs of AB specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 6. Microscopic photograph of tensile fracture micrographs of HT7 specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 7. Microscopic morphology images of AB specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 8. Microscopic morphology images of HT7 specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 9. EBSD pole and IPF maps of AB specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 10. EBSD pole and IPF maps of HT7 specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 11. Distribution of grain boundaries, phase maps, and distribution of grain size for AB specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 12. Distribution of grain boundaries, phase maps, and distribution of grain size for HT7 specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 13. Schematic of microstructure evolution mechanism of SLMed specimens in annealing heat treatment. (a) AB specimen; (b) HT7 specimen
Fig. 14. Dislocation density of AB specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 15. Dislocation density of HT7 specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 16. Grain orientation spread map of AB specimens. (a) 0°; (b) 45°; (c) 90°
Fig. 17. Grain orientation spread map of HT7 specimens. (a) 0°; (b) 45°; (c) 90°
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Table 1. Chemical composition of gas-atomized 316L powder
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Table 2. Heat treatment process of 316L stainless steel after SLM
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