PSI - Issue 34

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 34 (2021) 135–140

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Esiam organisers © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ESIAM organisers Keywords: laser powder bed fusion; AlSi10Mg; surface roughness; fatigue. Abstract Parts of complex geometry ar incre singly fabrica ed by powder bed fusion (PBF) of AlS 10Mg. Since post brication rface in shing may be restricted due to unacceptable co t in r ase or/and geom tr cal inaccessibil t of the part surfaces, the resulting fatigu performance of AlSi10Mg parts is often insufficient. Fatigue prop rties depend heavily local surface roughness which is affected by proc ssing pa ameters and printing stra egy. A i ect ag treatment is ofte appli d t improve materi l ductility while partially r lieving residu l stress s due to the powder melt ng and solidificat on proc ss of L-PBF fabric tion. This contribution inv stigated the fatigue performance of as-built AlSi10Mg together with the ear-surf ce quality affected by fabrication. Three sets of specimens oriented in different directi with resp ct to build direction were fabricated in an industrial AM sys em. A significant dire tional effect of the fatigu espo se was dete mined. The quality of the as-built surf ces in the different sp cime s was characterized in terms of surface roughness nd near surface mic o tructure on etched metallographic s ctions to explai the fatigue da a of L-PBF AlSi10Mg. The directional nature of residual stresses and the contribution on fatigue behavior is also invoked as a contributing factor. © 2020 The Authors. Published by ELSEVIER B.V. This is an ope acces article under CC BY-NC-ND lic nse (https://creativecommons.org/licenses/by-nc-nd/4.0) P er-review under r sponsib lity of the scienti i c mmittee of th ESIAM organisers Keywords: laser powder bed fusion; AlSi10Mg; surface roughness; fatigue. The second European Conference on the Structural Integrity of Additively Manufactured Materials Surface quality and fatigue behavior of L-PBF AlSi10Mg in as-built condition Radomila Konecna a *, Federico Uriati b , Gianni Nicoletto b , Varmus Tibor a a University of Zilina, Dept. of Materials Engineering, Zilina, Slovakia b University of Parma, Dept. of Engineering and Architecture, 43124 Parma, Italy Abstract Parts of complex geometry are increasingly fabricated by powder bed fusion (PBF) of AlSi10Mg. Since post fabrication surface finishing may be restricted due to unacceptable cost increase or/and geometrical inaccessibility of the part surfaces, the resulting fatigue performance of AlSi10Mg parts is often insufficient. Fatigue properties depend heavily local surface roughness which is affected by processing parameters and printing strategy. A direct aging treatment is often applied to improve material ductility while partially relieving residual stresses due to the powder melting and solidification process of L-PBF fabrication. This contribution investigated the fatigue performance of as-built AlSi10Mg together with the near-surface quality affected by fabrication. Three sets of specimens oriented in different directions with respect to build direction were fabricated in an industrial AM system. A significant directional effect of the fatigue response was determined. The quality of the as-built surfaces in the different specimens was characterized in terms of surface roughness and near surface microstructure on etched metallographic sections to explain the fatigue data of L-PBF AlSi10Mg. The directional nature of residual stresses and the contribution on fatigue behavior is also invoked as a contributing factor. The second European Conference on the S ructural Integrity of Additively Manufactured Materials Surface quality and fatigue behavior of L-PBF AlSi10Mg in as-built condition Radomila Konecna a *, Federico Uriati b , Gianni Nicoletto b , Varmus Tibor a a University of Zilina, Dept. of Materials Engineering, Zilina, Slovaki b University of Parma, Dept. of Engineering and Architecture, 43124 Parma, Italy

* Corresponding author. Tel.: +421 41 513 2604; fax: +421 41 565 2940. E-mail address: radomila.konecna@fstroj.uniza.sk * Correspon ing auth r. Tel.: +421 41 513 2604; fax: +421 41 565 2940. E-mail address: radomila.konecna@fstroj.uniza.sk

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Esiam organisers 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an ope acces article under CC BY-NC-ND lic nse (http ://creativecommons.org/licenses/by-nc-nd/4.0)

Peer-review under responsibility of the scientific committee of the Esiam organisers

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Esiam organisers 10.1016/j.prostr.2021.12.020