PSI - Issue 52

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 52 (2024) 143–153

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2452-3216 © 2023 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 Professor Ferri Aliabadi 10.1016/j.prostr.2023.12.015 2452-3216 © 2023 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 Professor Ferri Aliabadi 2452-3216 © 2023 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 Professor Ferri Aliabadi * Corresponding author. Tel.: 420-532-290-343. E-mail address: sulak@ipm.cz © 2023 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 Professor Ferri Aliabadi Abstract NiCu-based alloys are frequently employed as a key material for heat exchangers and superheated steam systems where the emphasis is put on the resistance against metal dusting and corrosion in harsh environments and, at the same time, excellent mechanical properties at elevated temperatures. The present contribution delivers the experimental results on high-temperature fatigue and creep performance of additively manufactured NiCu-based Alloy 400 and compares it with conventionally produced material. The fatigue tests were performed in symmetrical force control loading in laboratory air at elevated temperatures. Standard constant stress uniaxial creep tests were carried out up to the rupture at applied stresses ranging from 30 to 150 MPa and temperatures between 600 – 880 °C in a protective argon atmosphere. Results indicate inferior fatigue and creep properties of additively manufactured Alloy 400. This detrimental effect of the manufacturing process on mechanical properties can be caused by several factors, including the orientation of the building direction relative to the loading direction, strong texture in 〈 011 〉 direction, and also by the presence of defects revealed by means of scanning electron microscopy on fracture surfaces of additively manufactured materials. Fracture, Damage and Structural Health Monitoring High-temperature Fatigue and Creep Performance of Additively Manufactured NiCu-based Alloy Ivo Šulák a * , Alice Chlupová a , Tomáš Záležák a , Ivo Kuběna a , Jan-Philipp Roth b , Katrin Jahns b , Ulrich Krupp c , Tomáš Kruml a a Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech Republic b Faculty of Engineering and Computer Science, Osnabrück University of Applied Sciences, Albrechtstr. 30, 49076 Osnabrück, Germany c Steel Institute IEHK, RWTH Aachen University, Intzestraße 1, 52072 Aachen, Germany Abstract NiCu-based alloys are frequently employed as a key material for heat exchangers and superheated steam systems where the emphasis is put on the resistance against metal dusting and corrosion in harsh environments and, at the same time, excellent mechanical properties at elevated temperatures. The present contribution delivers the experimental results on high-temperature fatigue and creep performance of additively manufactured NiCu-based Alloy 400 and compares it with conventionally produced material. The fatigue tests were performed in symmetrical force control loading in laboratory air at elevated temperatures. Standard constant stress uniaxial creep tests were carried out up to the rupture at applied stresses ranging from 30 to 150 MPa and temperatures between 600 – 880 °C in a protective argon atmosphere. Results indicate inferior fatigue and creep properties of additively manufactured Alloy 400. This detrimental effect of the manufacturing process on mechanical properties can be caused by several factors, including the orientation of the building direction relative to the loading direction, strong texture in 〈 011 〉 direction, and also by the presence of defects revealed by means of scanning electron microscopy on fracture surfaces of additively manufactured materials. Keywords: Additive manufacturing, Alloy 400, fatigue lifetime, creep behaviour, electron microscopy 1. Introduction The laser powder bed fusion (LPBF) process is one of the additive manufacturing technologies used for the 3D printing of metals. It emerged as a disruptive technology with reduced manufacturing steps and minimum processing Fracture, Damage and Structural Health Monitoring High-temperature Fatigue and Creep Performance of Additively Manufactured NiCu-based Alloy Ivo Šulák a * , Alice Chlupová a , Tomáš Záležák a , Ivo Kuběna a , Jan-Philipp Roth b , Katrin Jahns b , Ulrich Krupp c , Tomáš Kruml a a Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech Republic b Faculty of Engineering and Computer Science, Osnabrück University of Applied Sciences, Albrechtstr. 30, 49076 Osnabrück, Germany c Steel Institute IEHK, RWTH Aachen University, Intzestraße 1, 52072 Aachen, Germany Keywords: Additive manufacturing, Alloy 400, fatigue lifetime, creep behaviour, electron microscopy 1. Introduction The laser powder bed fusion (LPBF) process is one of the additive manufacturing technologies used for the 3D printing of metals. It emerged as a disruptive technology with reduced manufacturing steps and minimum processing * Corresponding author. Tel.: 420-532-290-343. E-mail address: sulak@ipm.cz