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Hydrogen embrittlement testing procedure for the analysis of structural steels with Small Punch Tests using notched specimens

dc.contributor.authorÁlvarez Díaz, Guillermo 
dc.contributor.authorZafra García, Alfredo Manuel 
dc.contributor.authorBelzunce Varela, Francisco Javier 
dc.contributor.authorRodríguez González, María Cristina
dc.identifier.citationEngineering Fracture Mechanics, 253 (2021); doi:10.1016/j.engfracmech.2021.107906
dc.description.abstractThe influence of hydrogen on the mechanical properties of three structural steels has been evaluated. A testing procedure based on the Small Punch Test with notched specimens was used to measure hydrogen embrittlement. Two pre-charging methods were applied to introduce hydrogen in the samples. The first method used gaseous hydrogen in a high-pressure reactor at 19.5 MPa and 450 ◦C for 21 h. The second involved cathodic charging from 2 M H2SO4 + As2O3 electrolyte with a current density of 2 mA/cm2. The results obtained in the Small Punch Tests were compared with those obtained using standard fracture tests. The hydrogen embrittlement behaviour of the different steels, with special attention to the effect of their chemical compositions and microstructures, were compared. The embrittlement indexes obtained with Small Punch Tests are lower than those obtained with standard tests. The low thickness and lower stress triaxiality of the Small Punch Test specimens explains this result. Regardless of the test method used, hydrogen embrittlement grows with the strength of the analysed
dc.description.sponsorshipThis work was supported by the Spanish Ministry of Science, Innovation and Universities RTI2018-096070-B-C31. The authors G. Álvarez and A. Zafra would like to thank the Principality of Asturias for the support received with the Severo Ochoa grants, PA-20-PF-BP19-087 and PA-18-PF-BP17-038 respectively. Finally, the authors also thank the Scientific and Technical Service, University of Oviedo, for the use of the SEM JEOL-JSM5600 scanning electron
dc.relation.ispartofEngineering Fracture Mechanics, 253spa
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rights© 2021 The Author(s). Published by Elsevier Ltd.
dc.titleHydrogen embrittlement testing procedure for the analysis of structural steels with Small Punch Tests using notched specimensspa
dc.local.notesOA ATUO21

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