PSI - Issue 24

Available online at www.sciencedirect.com Structural Int grity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 24 (2019) 349–359

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the AIAS2019 organizers © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the AIAS2019 organizers Keywords: additive manufacturing, build orientation, fatigue, direct metal laser sintering, titanium. For these reasons, the following work aims to xamine the exp rimental results of th fatigue behavior fo as-built specimens produced with Ti-6Al-4V powders through the DMLS additive roduction technique with optimized parameters, using two different build di ections. The two dif erent b haviors will be compared. In particular, attention will be focused not only on the results obtained from the experimental fatigue tests but, through a sc nning electron microscope (SEM), the single fract r surfac s will b investigated and in con l ion consi eratio s on th residual stress state will be made. All th results will be use in rder to determin and correlate the cau s to the different fatigue behavior. Th results obtained c n be used as a starting point for the performance quantification of subsequent treatments or more simply be used in the design phase. © 2019 The Authors. Published by Elsevier B.V. This is an ope access article under t CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the AIAS2019 organizers Keywords: additive manufacturing, build orientation, fatigue, direct metal laser sintering, titanium. AIAS 2019 International Conference on Stress Analysis Effects of build orientation on fatigue behavior of Ti-6Al-4V as-built specimens produced by direct metal laser sintering Giulia Morettini a *, Seyed Mohammad Javad Razavi b , Guido Zucca a a University of Perugia, Department of Industrial Engineering, Via G. Duranti 67, 06125 Perugia, Italy b Department of Mechanical and Industrial Engineering, (NTNU), Richard Birkelands vei 2b, 7491 Trondheim, Norway Additive Manufacturing (AM) is undoubtedly of high potential to fulfil the needs of modern digital manufacturing, however, the failure prediction of the components made by this technique is still a challenging task due to uncertainty in their structural properties. Different geometries and build orientation of AM parts results in various surface roughness and residual stresses and consequently various mechanical properties. Regardless of the type of laser AM technique (Direct Energy Deposition (DED), Selective Laser Melting (SLM), Direct Metal Laser Sintering (DMLS), etc.), the AM components are usually subjected to heat treatments in order to eliminate the residual stress and improve metallurgical characteristics, and to surface treatments to decrease their roughness. Although rarer, the cases in which the specimens are tested as-built, are considered extremely necessary in order to quantify the quality of machine molding and the set of parameters used, as well as the validity of any other subsequent treatment. For these reasons, the following work aims to examine the experimental results of the fatigue behavior for as-built specimens produced with Ti-6Al-4V powders through the DMLS additive production technique with optimized parameters, using two different build directions. The two different behaviors will be compared. In particular, attention will be focused not only on the results obtained from the experimental fatigue tests but, through a scanning electron microscope (SEM), the single fracture surfaces will be investigated and in conclusion considerations on the residual stress state will be made. All the results will be use in order to determine and correlate the causes to the different fatigue behavior. The results obtained can be used as a starting point for the performance quantification of subsequent treatments or more simply be used in the design phase. AIAS 2019 International Conference on Stress Analysis Effects of build orientation on fatigue behavior of Ti-6Al-4V as-built specimens produced by direct metal laser sintering Giulia Morettini a *, Seyed Mohammad Javad Razavi b , Guido Zucca a a University of Perugia, Department of Industrial Engineering, Via G. Duranti 67, 06125 Perugia, Italy b Department of Mechanical and Industrial Engineering, (NTNU), Richard Birkelands vei 2b, 7491 Trondheim, Norway Abstract Additive Manufacturing (AM) is u doubtedly of gh potential to fulfil the ne ds of modern digital manufacturi g, however, the failure prediction of the components made by th s technique is still a challenging task due to uncertainty in their structural prop rti s. Diffe ent geometries and build orientation of AM parts results in various surfac roughness and residual stresses and consequ ntly various mechanical p operti s. Regardless of the type of laser AM technique (Direct Energy Deposition (DED), S lective Lase Melting (SLM), Di ct Metal Laser S nte ing (DMLS), etc.), the AM components a e usually subjecte to heat r atments in order to eliminate the residual stress and improve metallurgical characteristi s, and to surface treatment to decrease heir roughness. A though rarer, the cases in which the s eci ns are tested as-buil , are considered extremely n cessary in order to quantify the quality of machine m lding and the set of parameters used, as well as the validity of any other subseq ent tr at t. Abstract

* Corresponding author. Tel.: +39-329-004-9720; E-mail address: morettinigiulia@gmail.com * Corresponding author. Tel.: +39-329-004-9720; E-mail address: morettinigiulia@gmail.com

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the AIAS2019 organizers 2452-3216 © 2019 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 AIAS2019 organizers

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the AIAS2019 organizers 10.1016/j.prostr.2020.02.032