PSI - Issue 28

Available online at www.sciencedirect.com Structural Int grity Procedia 00 (2020) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2020) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 28 (2020) 180–187

© 2020 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 European Structural Integrity Society (ESIS) ExCo Abstract The Small Punch test has been recently used to estimate mechanical properties of steels in aggressive environments. This technique, very interesting when there is shortage of material, consists in using a small plane specimen and punch it until it fails. The type of tests normally used are under a constant load in an aggressive environment, with the target to determine the threshold stress. However, this is an inaccurate technique which takes time, as the tests are quite slow. In this paper, the Small Punch tests are combined with the step loading technique collected in the standard ASTM F1624 [1] to obtain the value of threshold stress of an S420 steel in a total time of approximately one week. The ASTM F1624 indicates how to apply constant load steps in hydrogen embrittlement environments, increasing them subsequently and adapting their duration until the specimen fails. The environment is created by means of cathodic polarization of cylindrical tensile specimens in an acid electrolyte. A batch of standard tests are performed to validate the methodology. © 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 the IbCSI 2020 organizers 1st Virtual European Conference on Fracture Application of the incremental step loading technique to Small Punch Tests on S420 steel in acid environments B. Arroyo a,* , L. Andrea a , P. González a , J.A. Álvarez a , S. Cicero a , R. Lacalle a , A. Fernández a a LADICIM University of Cantabria, Avenida de los Castros s/n, Santander 39005, Spain Abstract The Small Pu ch test has been recently used to estimate mechanical properties of steels in aggressive environments. This technique, very interesting when there is shortage of material, consists in using a small plane specimen and punch it until it fails. The typ of tests normally used are under a co stant load in an aggressive environment, with the target to determine the threshold stress. However, this is an inaccurate technique which takes time, as the tests are quite slow. In this paper, the Small Punch tests are combin d with the step loading technique c ll cted in the standard ASTM F1624 [1] to obtain the value of threshold stress f a S420 steel i a total ti of approximately one week. The ASTM F1624 indicates how to apply constant load steps i hydrogen embrittlement environments, increasing them subsequently and ada ting their duration until the specimen fails. The environment is created by means of cathodic polarization of cylindrical tensile specimens in an acid electrolyte. A batch of standard tests are performed to validate the methodology. © 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 the IbCSI 2020 organizers 1st Virtual European Conference on Fracture Application of the incremental step loading technique to Small Punch Tests on S420 steel in acid environments B. Arroyo a,* , L. Andrea a , P. González a , J.A. Álvarez a , S. Cicero a , R. Lacalle a , A. Fernández a a LADICIM University of Cantabria, Avenida de los Castros s/n, Santander 39005, Spain

Keywords: Small Punch; ASTME F1624; Hydrogen Embrittlement; Threshold Stress; Keywords: Small Punch; ASTME F1624; Hydrogen Embrittlement; Threshold Stress;

* Corresponding author. Tel.: +34-942-201-837 E-mail address: arroyob@unican.es * Corresponding auth r. Tel.: +34-942-201-837 E-mail address: arroyob@unican.es

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 the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND license (ht p://crea ivecommons. rg/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 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 European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.023