PSI - Issue 33

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Procedia Structural Integrity 00 (2021) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Procedia Structural Integrity 00 (2021) 000–000

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

Procedia Structural Integrity 33 (2021) 1139–1145

© 2021 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 IGF ExCo © 2021 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: high-strength eutectoid pearlitic steel, multiaxial stress states, stress triaxiality, hydrogen embrittlement, notch tensile strength, hydrogen-assisted micro-damage (HAMD), hydrogen damage topography (HDT) , tearing topography surface (TTS). Abstract This paper offer a detailed analysis of the hydrog n-assisted micro-damage (HAMD) region i axisymmetric round-notched samples f high-strength eutectoid pearlitic steel under hydrogen embrittlement environm ntal conditions. Emphasis is placed on the microscopic appearance and the voluti n of such a microscopic topography from the initiation (sub-critical) to he fractur (critical) point. The use of very different notched geometries —with the subsequent various triaxial stress distributio s in the vicinity of the notch tip— llows an anal sis of the influence of stress state on hydrogen diffusion and micro- acking. In all cases, the microscopic appea ance of the hydrogen-affected zone resembles micro-damage, micro-cracking or micro-tearing due to hydrogen degradation , thereby affecting the notch tensile strength and producing hydrogen embrittlement . © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article und r the CC BY-NC-ND licens (https:// reativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: high-strength eutectoid pearlitic steel, multi xi l stress states, stress triaxi lity, hydrogen emb ittl ment, notch tensile strength, hydrogen-assisted micro-damage (HAMD), hydrogen damage topography (HDT) , tearing topography surface (TTS). IGF26 - 26th International Conference on Fracture and Structural Integrity Triaxiality effects on hydrogen-assisted micro-damage (HAMD), notch tensile strength and hydrogen embrittlement of pearlitic steel Jesús Toribio * Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain Abstract This paper offers a detailed analysis of the hydrogen-assisted micro-damage (HAMD) region in axisymmetric round-notched samples of high-strength eutectoid pearlitic steel under hydrogen embrittlement environmental conditions. Emphasis is placed on the microscopic appearance and the evolution of such a microscopic topography from the initiation (sub-critical) to the fracture (critical) point. The use of very different notched geometries —with the subsequent various triaxial stress distributions in the vicinity of the notch tip— allows an analysis of the influence of stress state on hydrogen diffusion and micro-cracking. In all cases, the microscopic appearance of the hydrogen-affected zone resembles micro-damage, micro-cracking or micro-tearing due to hydrogen degradation , thereby affecting the notch tensile strength and producing hydrogen embrittlement . IGF26 - 26th International Conference on Fracture and Structural Integrity Triaxiality effects on hydrogen-assisted micro-damage (HAMD), notch tensile strength and hydrogen embrittlement of pearlitic steel Jesús Toribio * Fracture & Structural Integrity Research Group (FSIRG), University of al manca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain

* Corresponding author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es * Correspon ing author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es

2452-3216 © 2021 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open acc ss article und r the CC BY-NC-ND licens (https:// reativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo

2452-3216 © 2021 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 IGF ExCo 10.1016/j.prostr.2021.10.127