PSI - Issue 42

ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Procedia Structural Integrity 42 (2022) 738–744

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© 2022 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 23 European Conference on Fracture – ECF23 Abstract There is an increasing need to test and evaluate the integrity of ageing components and structures in nuclear engineering. Since materials for nuclear applications are subjected to thermal, corrosive, tensile, and fatigue loads during their service life, a deep understanding of microstructural degradation is desirable, as it can be gained by nondestructive testing (NDT) methods. In this study, an innovative fatigue testing setup and NDT methods are combined to develop new, efficient and reliable concepts to evaluate fatigue life and damage mechanisms. For this purpose, specimens of metastable austenitic stainless AISI 347 (X6CrNiNb18-10, 1.4550) steel, relevant for pipe components, are tested in a setup allowing in-situ measurement of temperature, micromagnetic, electric and electrochemical NDT parameters. Strain-controlled constant amplitude and strain-increase tests were performed and various physical measurements were applied for a fatigue life analysis by short-time evaluation procedures. In-situ NDT parameters are linked to the microstructural evolution of the metastable austenite during cyclic loading. Extensive microstructural analysis through methods like electron backscatter diffraction have been performed in initial condition to help understanding data development versus life time. It is shown that an advanced test setup based on micromagnetic and electrochemical measurements is suitable to indicate fatigue damage-related mechanisms in a metastable austenitic material. In the future, these methods and findings could enable mobile testing systems to evaluate components in service regarding their remaining fat gue life. Abstract There is an increasing need to test and evaluate the integrity of ageing components and structures in nuclear engineering. Since materials for nuclear applications are subjected to thermal, corrosive, tensile, and fatigue loads during their service life, a deep understanding of microstructural degradation is desirable, as it can be gained by nondestructive testing (NDT) methods. In this study, an innovative fatigue testing setup and NDT methods are combined to develop new, efficient and reliable concepts to evaluate fatigue life and damage mechanisms. For this purpose, specimens of metastable austenitic stainless AISI 347 (X6CrNiNb18-10, 1.4550) steel, relevant for pipe components, are tested in a setup allowing in-situ measurement of temperature, micromagnetic, electric and electrochemical NDT parameters. Strain-controlled constant amplitude and strain-increase tests were performed and various physical measurements were applied for a fatigue life analysis by short-time evaluation procedures. In-situ NDT parameters are linked to the microstructural evolution of the metastable austenite during cyclic loading. Extensive microstructural analysis through methods like electron backscatter diffraction have been performed in initial condition to help understanding data development versus life time. It is shown that an advanced test setup based on micromagnetic and electrochemical measurements is suitable to indicate fatigue damage-related mechanisms in a metastable austenitic material. In the future, these methods and findings could enable mobile testing systems to evaluate components in service regarding their remaining fatigue life. 23 European Conference on Fracture - ECF23 Fatigue damage evaluation of stainless AISI 347 steel by advanced microstructure-sensitive NDT analysis Kai Donnerbauer a, *, Ruth Acosta b , Christian Boller b , Tobias Bill c , Peter Starke c , Klaus Heckmann d , Jürgen Sievers d , Tim Schopf e , Frank Walther a a Chair of Materials Test Engineering (WPT), TU Dortmund University, Baroper Str. 303, 44227 Dortmund, Germany b Chair of Nondestructive Testing and Quality Assurance (LZfPQ), Saarland University, Am Markt Zeile 4, 66125 Saarbrücken, Germany c Department of Materials Science and Materials Testing (WWHK), University of Applied Sciences Kaiserslautern, Morlauterer Straße 31, 67657 Kaiserslautern, Germany 23 European Conference on Fracture - ECF23 Fatigue damage evaluation of stainless AISI 347 steel by advanced microstructure-sensitive NDT analysis Kai Donnerbauer a, *, Ruth Ac sta b , Christian Boller b , Tobias Bill c , Peter Starke c , Klaus Heckmann d , Jürgen Sievers d , Tim Schopf e , Frank Walther a a Chair of Materials Test Engineering (WPT), TU Dortmund University, Baroper Str. 303, 44227 Dortmund, Germany b Chair of Nondestructive Testing and Quality Assu ance (LZfPQ), Saarland University, Am Markt Zeile 4, 66125 Saarbrücken, Germany c Department of Materials Science and Materials Testing (WWHK), University of Applied Sciences Kaiserslautern, Morlauterer Straße 31, 67657 Kaiserslautern, Germany d Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Schwertnergasse 1, 50667 Köln, Germany e Materials Testing Institute (MPA), University of Stuttgart, Pfaffenwaldring 32, 70569 Stuttgart, Germany d Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Schwertnergasse 1, 50667 Köln, Germany e Materials Testing Institute (MPA), University of Stuttgart, Pfaffenwaldring 32, 70569 Stuttgart, Germany

2452-3216 © 2022 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 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.093 2452-3216 © 2020 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 23 European Conference on Fracture - ECF23 2452-3216 © 2020 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 23 European Conference on Fracture - ECF23 * Corresponding author. Tel.: +49-231-755-8416; fax: +49-231-755-8429. E-mail address: kai.donnerbauer@tu-dortmund.de * Corresponding author. Tel.: +49-231-755-8416; fax: +49-231-755-8429. E-mail address: kai.donnerbauer@tu-dortmund.de