PSI - Issue 83

Ahmad Issmail et al. / Procedia Structural Integrity 83 (2026) 229–238

237

Compared to the same geometries previously studied in a stress-relieved condition [16], miniature specimens displayed a reduced build orientation-related anisotropy in fatigue behavior, as reflected by the 8.7% reduction in scatter index (T σ ) after T6 HT for the unified build orientation-independent statistical elaboration, despite the smaller dataset size in this study. Comparisons with as-built trends hint that the homogenizing effect of T6 HT attenuated the beneficial contribution given by unfavorably oriented MPBs to crack propagation, such as in m|H and in S|45° at higher stress levels. These results highlight the non-negligible role played by the MPB’s orientation-dependent crack growth behaviour in the fatigue behaviour of PBF-LB AlSi10Mg specimens containing process-intrinsic solidification imprints. Declaration of generative AI use During the preparation of this work, on limited occasions, the authors used OpenAI’s GPT-5 mode in order to improve the readability and language of the manuscript. After using this tool, the authors reviewed and edited the content as needed and take full responsibility for the content of the publication. References [1] E. O. Olakanmi, R. F. Cochrane, and K. W. Dalgarno, “A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties,” Prog. Mater. Sci. , vol. 74, pp. 401–477, Oct. 2015, doi: 10.1016/j.pmatsci.2015.03.002. [2] H. Y. Wan et al. , “Effects of surface roughness and build thickness on fatigue properties of selective laser melted Inconel 718 at 650 °C,” Int. J. Fatigue , vol. 137, p. 105654, Aug. 2020, doi: 10.1016/j.ijfatigue.2020.105654. [3] S. Kramer, H. Wexel, A. Purwitasari, M. Jarwitz, V. Schulze, and F. Zanger, “Impact of different pore types on the tensile and fatigue properties of AlSi10Mg parts produced by laser powder bed fusion,” Prog. Addit. Manuf. , vol. 10, no. 12, pp. 11305– 11317, Dec. 2025, doi: 10.1007/s40964-025-01288-x. [4] J. Zhang, B. Song, Q. Wei, D. Bourell, and Y. Shi, “A review of selective laser melting of aluminum alloys: Processing, microstructure, property and developing trends,” J. Mater. Sci. Technol. , vol. 35, no. 2, pp. 270–284, Feb. 2019, doi: 10.1016/j.jmst.2018.09.004. [5] C. G. Wang et al. , “Effect of building orientation and heat treatment on the anisotropic tensile properties of AlSi10Mg fabricated by selective laser melting,” J. Alloys Compd. , vol. 895, p. 162665, Feb. 2022, doi: 10.1016/j.jallcom.2021.162665. [6] M. J. Paul, Q. Liu, X. Li, J. J. Kruzic, U. Ramamurty, and B. Gludovatz, “Impact of micro and mesostructure on the fatigue crack growth in laser powder bed fusion fabricated AlSi10Mg,” Acta Mater. , vol. 293, p. 121070, Jul. 2025, doi: 10.1016/j.actamat.2025.121070. [7] N. T. Aboulkhair, I. Maskery, C. Tuck, I. Ashcroft, and N. M. Everitt, “Improving the fatigue behaviour of a selectively laser melted aluminium alloy: Influence of heat treatment and surface quality,” Mater. Des. , vol. 104, pp. 174–182, Aug. 2016, doi: 10.1016/j.matdes.2016.05.041. [8] S. Beretta, M. Gargourimotlagh, S. Foletti, A. Du Plessis, and M. Riccio, “Fatigue strength assessment of ‘as built’ AlSi10Mg manufactured by SLM with different build orientations,” Int. J. Fatigue , vol. 139, p. 105737, Oct. 2020, doi: 10.1016/j.ijfatigue.2020.105737. [9] N. Takata, H. Kodaira, A. Suzuki, and M. Kobashi, “Size dependence of microstructure of AlSi10Mg alloy fabricated by selective laser melting,” Mater. Charact. , vol. 143, pp. 18–26, Sep. 2018, doi: 10.1016/j.matchar.2017.11.052. [10] C. Peng et al. , “Effect of Feature Size on Defects, Microstructure, and Mechanical Properties of Selective Laser Melted AlSi10Mg Lattice Structure,” Metals , vol. 15, no. 1, p. 77, Jan. 2025, doi: 10.3390/met15010077. [11] Z. Feng et al. , “Influence of scale effect on surface morphology in laser powder bed fusion technology,” Virtual Phys. Prototyp. , vol. 19, no. 1, p. e2336157, Dec. 2024, doi: 10.1080/17452759.2024.2336157. [12] N. Spignoli and G. Minak, “Influence on Fatigue Strength of Post-Process Treatments on Thin-Walled AlSi10Mg Structures Made by Additive Manufacturing,” Metals , vol. 13, no. 1, p. 126, Jan. 2023, doi: 10.3390/met13010126. [13] A. Kumar Ramavajjala, T. R. Dandekar, R. K. Khatirkar, C. Joshi, R. N. Chouhan, and A. Agnihotri, “A review on the correlation between microstructure, heat treatment and mechanical properties of additively manufactured AlSi10Mg by LPBF,” Crit. Rev. Solid State Mater. Sci. , pp. 1–36, Nov. 2024, doi: 10.1080/10408436.2024.2414012.