PSI - Issue 24

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 24 (2019) 541–558

AIAS 2019 International Conference on Stress Analysis Precipitation hardening stainless steel produced by powder bed fusion: influence of positioning and heat treatment Jacopo De Nisi a , Fabio Pozzi b , Paolo Folgarait a, *, Gabriele Ceselin b , Mirco Ronci c AIAS 2019 International Conference on Stress Analysis Precipitation hardening stainless steel produced by powder bed fusion: influence of positioning and heat treatment Jacopo De Nisi a , Fabio Pozzi b , Paolo Folgarait a, *, Gabriele Ceselin b , Mirco Ronci c

a Seamthesis Srl, via IV Novembre 156, I-29122 Piacenza b AQM Srl, Via T. Edison 18, I- 25050 Provaglio d’Iseo (BS) c Synergy Process Srl, via dell’Artigianato 5, I -06031 Bevagna (PG) a Seamthesis Srl, via IV Novembre 156, I-29122 Piacenza b AQM Srl, Via T. Edison 18, I- 25050 Provaglio d’Iseo (BS) c Synergy Process Srl, via dell’Artigianato 5, I -06031 Bevagna (PG)

Abstract Abstract

© 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; laser powder bed fusion; selective laser melting; precipitation hardening steels; 15-5 PH; heat treatment; microstructure; hardness; tensile properties Additive Manufacturing (AM) technologies are nowadays of interest in the most varied production sectors, first and foremost in the aerospace, automotive and biomedical sectors. Those technologies, essentially tooling-free, are appealing as it is possible to design a component independently on the specific processing route (e.g. undercuts, draft angles, internal channels with sharp edges or blind holes) and shape, with excellent geometrical and dimensional tolerances. 15-5 PH alloy is a precipitation hardened stainless steel, mainly applied for aircraft components and high-pressure pumps or valves manufacturing. The present work involved the production of L-PBF 15-5 PH specimens, subsequently tested on a laboratory scale for microstructural and mechanical characterization. Starting from experimental results, LPBF-experimentally derived properties have been compared with those of an analogous alloy, obtained by conventional manufacturing processes. Particular attention has been paid to the evaluation of the effect of heat treatment on mechanical properties and metallurgical features, to obtain equivalent or better performances with respect to literature reference values. For this reason, the material was tested in the as-built condition and in all the most used thermal treatment applied for solid parts (in accordance with reference Standards ASTM A564/A564 M and AMS 2759). © 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; laser powder bed fusion; selective laser melting; precipitation hardening steels; 15-5 PH; heat treatment; microstructure; hardness; tensile properties Additive Manufacturing (AM) technologies are nowadays of interest in the most varied production sectors, first and foremost in the aerospace, automotive and biomedical sectors. Those technologies, essentially tooling-free, are appealing as it is possible to design a component independently on the specific processing route (e.g. undercuts, draft angles, internal channels with sharp edges or blind holes) and shape, with excellent geometrical and dimensional tolerances. 15-5 PH alloy is a precipitation hardened stainless steel, mainly applied for aircraft components and high-pressure pumps or valves manufacturing. The present work involved the production of L-PBF 15-5 PH specimens, subsequently tested on a laboratory scale for microstructural and mechanical characterization. Starting from experimental results, LPBF-experimentally derived properties have been compared with those of an analogous alloy, obtained by conventional manufacturing processes. Particular attention has been paid to the evaluation of the effect of heat treatment on mechanical properties and metallurgical features, to obtain equivalent or better performances with respect to literature reference values. For this reason, the material was tested in the as-built condition and in all the most used thermal treatment applied for solid parts (in accordance with reference Standards ASTM A564/A564 M and AMS 2759).

* Corresponding author. E-mail address: paolo.folgarait@seamthesis.com * Corresponding author. E-mail address: paolo.folgarait@seamthesis.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 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

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.2020.02.048