PSI - Issue 68

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

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Procedia Structural Integrity 68 (2025) 1129–1139

European Conference on Fracture 2024 Screening the Mechanical Degradation of Combustion Engine and Exhaust Metallic Materials in High Pressure and High Temperature Hydrogen Gas Environment Birhan Sefer a *, Pontus Rydgren a , Eduard Navalles a , Niklas Israelsson b , Emil Edin c , Lars

Olof Nordin c , Nuria Fuertes a a Swerim AB, Box 7047, SE-164 07 Kista, Sweden b Volvo Technology AB, Materials Technology, SE-405 08, Gothenburg, Sweden c LKAB, Material Laboratory, Box 952, SE- 971 28, Luleå, Sweden

Abstract This study investigated the impact of hydrogen gas (H 2 ) on the mechanical properties of conventional metallic materials used in Diesel Internal Combustion Engines (DICE) and exhaust components at room and elevated temperatures. Two conventional materials commonly used in the combustion section of a DICE such as compacted graphite iron (CGI) used in cylinder heads and the Fe-Ni-base alloy NCF3015 used in engine valves were included in the study as well as one material commonly used for exhaust components the cast iron SiMo51. To evaluate the impact of H 2 on the mechanical properties hollow specimens internally pressurized with 200 bar H 2 were tensile tested using slow strain rate (SSRT) and compared with inert gas (Ar) as reference. The results from SSRT were correlated to the fractographic analysis of the specimens post-testing using Scanning Electron Microscope (SEM). Additionally, thermal desorption spectroscopy coupled with a mass spectrometer (TDMS) was used to analyse hydrogen uptake after SSRT. Key findings from this work revealed significant property loss in SiMo51 material at both room and elevated temperature, while the CGI showed greater sensitivity at room temperature compared to elevated temperature. In contrast, for NCF3015, H 2 showed minimal impact on its properties. The study also showed that the hollow specimen method proved to be an effective tool for assessing the impact of H 2 on mechanical properties at both room and elevated temperature. This work highlights the need for further investigations to determine the performance of these materials for hydrogen combustion applications, including additional SSRT along with fatigue testing at varying pressures and temperatures. © 2025 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 ECF24 organizers © 2025 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 ECF24 organizers

* Corresponding author. Tel.: +46 (0)73 048 37 98. E-mail address: birhan.sefer@swerim.se

2452-3216 © 2025 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 ECF24 organizers

2452-3216 © 2025 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 ECF24 organizers 10.1016/j.prostr.2025.06.209