PSI - Issue 76

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ScienceDirect

Procedia Structural Integrity 76 (2026) 115–122

© 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 the scientific committee of the FDMD 2025 chairpersons Keywords: Martensitic stainless steel sheet; Very high cycle fatigue; Ultrasonic fatigue testing; Non-metallic inclusions; Residual stresses Failure in the high cycle fatigue (HCF) regime originated mainly from surface inclusions, whereas VHCF fracture was solely from the interior. The fatigue strength was slightly lower in both the HCF and VHCF regimes for specimens extracted from the 2.3 mm thick sheet. The 1.8 mm thick sheet exhibited the highest VHCF strength, while the lifetimes of the 3.1 mm sheet were in between. The lower fatigue strength of the 2.3 mm steel can be explained by crack initiation at, in mean, larger inclusions compared to the other steel sheets. A fracture mechanics evaluation of the data – considering the size-dependency of the threshold stress intensity factor for small, crack-like defects – suggests that compressive as well as tensile residual stresses at the surface and in the interior, respectively, significantly affect the fatigue properties. 5th International Symposium on Fatigue Design and Material Defects FDMD 2025 Very high cycle fatigue properties of martensitic stainless steel sheets Afshin Khatammanesh a, *, Christina Mamagkinidou a , Martin Rester b , Maximilian Prunbauer b , Michael Proschek b , Bernd M. Schönbauer a, * a Christian Doppler Laboratory for Defect Tolerance of Steels in the High and Very High Cycle Fatigue Regime, Institute of Physics and Materials Science, Department of Natural Sciences and Sustainable Resources, BOKU University, Peter-Jordan-Strasse 82, 1190 Vienna, Austria b Berndorf Band GmbH, Corporate Research and Innovation, Leobersdorfer Str. 26, 2560 Berndorf, Austria Abstract In the present investigation, the very high cycle fatigue (VHCF) properties of precipitation-hardened chromium-nickel martensitic stainless steel sheets are studied. Test specimens were extracted from 1.8 mm, 2.3 mm, and 3.1 mm thick 14-7PH steel sheets with comparable hardness (454 – 470 HV10). Experiments were conducted using ultrasonic fatigue testing up to 10 10 cycles at fully reversed loading. Fractographic investigations were performed to identify the type and location of failure.

* Corresponding authors. Tel.: +43-1-47654 89216. E-mail address: afshin.khatammanesh@boku.ac.at, bernd.schoenbauer@boku.ac.at

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 the scientific committee of the FDMD 2025 chairpersons 10.1016/j.prostr.2025.12.294