PSI - Issue 65

Boris Voloskov et al. / Procedia Structural Integrity 65 (2024) 302–309 Voloskov et al./ Structural Integrity Procedia 00 (2024) 000–000

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5. Conclusion

The XCT analysis of the specimens of 316L stainless steel produced by PBF-LB using two scanning strategies and three different hatch distances was carried out to study its effects on porosity. The performed analysis revealed the differences in defect distribution between the NP and chessboard scanning strategies. Specifically, while the NP strategy exhibited significant number of lack of fusion defects, the chessboard pattern tended to produce smaller, more uniformly distributed gas pores. For both scanning strategies, the hatch distance of 80 µm, which recommended by manufacturer, showed the best results, namely lowest volume fraction porosity with more spherical defects. Mechanical testing has confirmed these observations, with the highest ultimate tensile strength and yield strength obtained at a hatch distance of 80 µm for both scanning strategies. However, the specimens printed using chessboard scanning strategy with hatch distance of 110 µm have shown similar results in strength. Overall, selecting the appropriate scanning parameters plays a critical role in enhancing the overall quality of the component.

Acknowledgements

Research was supported by the Russian Science Foundation (project 24-19-00484) https://rscf.ru/en/project/24 19-00484/.

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