PSI - Issue 53

R.F. Fernandes et al. / Procedia Structural Integrity 53 (2024) 144–150 Author name / Structural Integrity Procedia 00 (2019) 000–000

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4. Conclusions This work focused on the investigation of the fatigue behavior of both unnotched and notched specimens produced by LPBF in AlSi10Mg, aiming to understand the influence of optimized stress relief on fatigue behavior under variable amplitude loading. The following conclusions were draw:  The applied heat treatment led to a decrease in hardness and an increase in ductility, resulting in a reduction of the monotonic strength.  Fatigue results showed better performance in the stress relief (SR) series, characterized by enhanced fatigue strength;  The relief of residual stress and their subsequent stabilization were the main mechanisms responsible for improving the fatigue strength;  The method used to predict the fatigue life demonstrated good results for unnotched specimens, while the predicted fatigue life for notched specimens was conservative because the method neglected notch plasticity. This method should be improved to consider the notch plasticity. Acknowledgements This study was funded by national funds through FCT – Fundação para a Ciência e a Tecnologia –, under the project UIDB/00285/2020 and LA/P/0112/2020. Rui Fernandes is also grateful to the FCT for the PhD grant with reference 2022.14234.BD. References 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. Materials and Design, 145, 28–41. DIN 1706, 2021. Aluminium and aluminium alloys - Castings - Chemical composition and mechanical properties. Fiocchi, J., Tuissi, A., Biffi, C. A., 2021. Heat treatment of aluminium alloys produced by laser powder bed fusion: A review. Materials and Design, 204, 109651. Konecna, R., Nicoletto, G., Kunz, L., & Jambor, M., 2022. Notch Orientation and Fatigue Strength of As-built L-PBF AlSi10Mg. Procedia Structural Integrity, 42, 857–862. Liu, X., Zhao, C., Zhou, X., Shen, Z., & Liu, W., 2019. Microstructure of selective laser melted AlSi10Mg alloy. Materials and Design, 168, 107677. Maleki, E., Bagherifard, S., Unal, O., Bandini, M., & Guagliano, M., 2022. On the effects of laser shock peening on fatigue behavior of V notched AlSi10Mg manufactured by laser powder bed fusion. International Journal of Fatigue, 163, 107035. Mfusi, B. J., Mathe, N. R., Tshabalala, L. C., & Popoola, P. A. I., 2019. The effect of stress relief on the mechanical and fatigue properties of additively manufactured AlSi10Mg parts. Metals, 9(11), 1–14. Miner, M. A., 1945. Cumulative Damage in Fatigue. Journal of Applied Mechanics, 12(3), A159–A164. Nicoletto, G., 2020. Influence of Rough As-Built Surfaces on Smooth and Notched Fatigue Behavior of L-PBF AlSi10Mg. Additive Manufacturing, 34, 101251. Smith K. N., Watson P, & Topper Th., 1970. Stress- strain function for the fatigue of metals. J Mater, 5(4), 767–778. Tridello, A., Fiocchi, J., Biffi, C. A., Chiandussi, G., Rossetto, M., Tuissi, A., & Paolino, D. S., 2020. Effect of microstructure, residual stresses and building orientation on the fatigue response up to 109 cycles of an SLM AlSi10Mg alloy. International Journal of Fatigue, 137, 105659. Wu, J., Wang, X. Q., Wang, W., Attallah, M. M., & Loretto, M. H., 2016. Microstructure and strength of selectively laser melted AlSi10Mg. Acta Materialia, 117, 311–320. 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. Zhang, C., Zhu, H., Liao, H., Cheng, Y., Hu, Z., & Zeng, X., 2018. Effect of heat treatments on fatigue property of selective laser melting AlSi10Mg. International Journal of Fatigue, 116, 513–522. Zhang, Y., Li, X., Yuan, S., Sun, R., Sakai, T., Lashari, M. I., Hamid, U., & Li, W., 2022. High-cycle-fatigue properties of selective-laser-melted AlSi10Mg with multiple building directions. International Journal of Mechanical Sciences, 224, 107336. Zhu, W., Zhao, F., Yin, S., Liu, Y., & Yang, R., 2021. Effect of Tensile Deformation on Residual Stress of GH4169 Alloy. Materials, 14, 1773.

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