PSI - Issue 66

R. Fernades et al. / Procedia Structural Integrity 66 (2024) 49–54 Author name / Structural Integrity Procedia 00 (2025) 000 – 000

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4. Conclusions Current work aimed to investigate the influence of heat treatment on fatigue crack path of LPBF AlSi10Mg aluminum alloy. The following conclusions can be drawn: - The applied heat treatments induced slight microstructural transformations, resulting in a coarser Al-Si supersaturated matrix; - The microstructural transformations increase the ductility and the fatigue crack growth resistance; - Fatigue crack propagation is predominantly interlayer, with some intralayer failure nearly boundaries. - Propagation modes are quite similar for the three material conditions. - Heat treatments enhanced the ductility and the fracture toughness giving greater visibility to the overload marks, promoting a longer crack propagation period and a longer crack at the final failure. Acknowledgements The authors express their gratitude for the financial support provided by the Portuguese Foundation for Science and Technology (FCT) under projects UIDB/00285/2020 and LA/P/0112/2020. This research was also sponsored by the project FACI-2023-MPR-04-014323 financed by European Funds under the Eureka smart label S0612-BRACER. Rui Fernandes acknowledges the FCT for the PhD grant with reference 2022.14234.BD. References Aboulkhair, N.T., Maskery, I., Tuck, C., Ashcroft, I., Everitt, N.M., 2016. Improving the fatigue behaviour of a selectively laser melted aluminium alloy: Influence of heat treatment and surface quality, Mater. Des. 104 , 174 – 182. Bagherifard, S., Beretta, N., Monti,S., Riccio, M., Bandini, M., Guagliano, M., 2018. On the fatigue strength enhancement of additive manufactured AlSi10Mg parts by mechanical and thermal post-processing, Mater. Des. 145 , 28 – 41. Brandl, E., Heckenberger, U., Holzinger, V., Buchbinder, D., 2012. Additive manufactured AlSi10Mg samples using selective laser melting (SLM): microstructure, high cycle fatigue, and fracture behavior, J. Mater. 34 , 159 – 169. Fiocchi, J., Tuissi, A., Biffi, C., 2021. Heat Treatment of Aluminium Alloys Produced by Laser Powder Bed Fusion: A Review. Materials and Design 204. Giovanni, M., Menezes, J., Bolelli, G., Cerri, E., Castrodeza, E., 2019. Fatigue Crack Growth Behavior of a Selective Laser Melted AlSi10Mg. Engineering Fracture Mechanics 217, 106564. Maskery, I., Aboulkhair, N.T.,Tuck, C., Wildman, R.D., Ashcroft, I.A., Everitt, N.M., Hague, R.J.M., 2015. Fatigue performance enhancement of selectively laser melted aluminium alloy by heat treatment. Solid Free. Fabr. Symp ., 1017 – 1025. Wu, J., Wang, X., Wang, W., Attallah, M., Loretto, M., 2016. Microstructure and Strength of Selectively Laser Melted AlSi10Mg. Acta Materialia 117, 311 – 20. Yan, Q., Song, B., Shi, Y., 2019. Comparative Study of Performance Comparison of AlSi10Mg Alloy Prepared by Selective Laser Melting and Casting. Journal of Materials Science and Technology 41, 199 – 208. Yang, K., Rometsch, P., Jarvis, T., Rao, J., Cao, S., Davies, C., Wu, X., 2018. Porosity Formation Mechanisms and Fatigue Response in Al-Si-Mg Alloys Made by Selective Laser Melting. Materials Science and Engineering A 712, 166 – 74.