Influence of non-homogeneous microstructure on hydrogen diffusion and trapping simulations near a crack tip in a welded joint

Hydrogen assisted fracture near welds is the result of a combination of microstructural changes and the accumulation of hydrogen. With the aim of predicting local hydrogen concentrations, hydrogen redistribution near a crack tip is simulated using a Boundary Layer approach and diffusion modelling is...

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Autores: Díaz Portugal, Andrés, Cuesta Segura, Isidoro Iván, Rodríguez, C., Alegre Calderón, Jesús Manuel
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2021
País:España
Institución:Universidad de Burgos (UBU)
Repositorio:Repositorio Institucional de la Universidad de Burgos (RIUBU)
OAI Identifier:oai:riubu.ubu.es:10259/5669
Acceso en línea:http://hdl.handle.net/10259/5669
Access Level:acceso abierto
Palabra clave:Hydrogen embrittlement
Fracture Mechanics
Hydrogen diffusion
Welding
Finite Element simulation
Resistencia de materiales
Strength of materials
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spelling Influence of non-homogeneous microstructure on hydrogen diffusion and trapping simulations near a crack tip in a welded jointDíaz Portugal, AndrésCuesta Segura, Isidoro IvánRodríguez, C.Alegre Calderón, Jesús ManuelHydrogen embrittlementFracture MechanicsHydrogen diffusionWeldingFinite Element simulationResistencia de materialesStrength of materialsHydrogen assisted fracture near welds is the result of a combination of microstructural changes and the accumulation of hydrogen. With the aim of predicting local hydrogen concentrations, hydrogen redistribution near a crack tip is simulated using a Boundary Layer approach and diffusion modelling is modified by trapping phenomena. The simulated non-homogeneous geometry includes layers that reproduce weld metal, heat affected zones and base metal of a 2.25Cr-1Mo steel; mechanical and diffusion properties have been extracted from references. The hydrogen transport model here considered involves a stress dependency that affects local concentrations; thus, the possible interaction between constraint effects associated to a graded material with hydrogen entry and transport is studied. Results show that the constraint effect is not significative for the loading and for the widths assigned to the weld and the heat affected zones (2.5 to 5 mm); however, for the HAZ-centred crack, a higher hydrostatic peak and the corresponding increase in lattice hydrogen are found. A two-type trapping process is also simulated to reproduce simultaneously the effect of dislocation trapping and microstructure delayed diffusion. Hydrogen is weakly trapped in dislocations and it is added to the lattice concentration to obtain a measure of diffusible hydrogen near a crack tip while effective diffusivity is strongly reduced by deeply trapped hydrogen. Differences between environmental or internal hydrogen sources are expected to be more accurately captured because stress-dependent boundary conditions have been implemented for hydrogen uptake.Ministry of Science, Innovation and Universities of Spain through gran RTI2018-096070-B-C33Elsevier202120212021info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttp://hdl.handle.net/10259/5669reponame:Repositorio Institucional de la Universidad de Burgos (RIUBU)instname:Universidad de Burgos (UBU)InglésTheoretical and Applied Fracture Mechanics. 2021, V. 112, 102879https://doi.org/10.1016/j.tafmec.2020.102879info:eu-repo/grantAgreement/MICINN/RTI2018-096070-B-C33/Attribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:riubu.ubu.es:10259/56692026-05-28T07:56:11Z
dc.title.none.fl_str_mv Influence of non-homogeneous microstructure on hydrogen diffusion and trapping simulations near a crack tip in a welded joint
title Influence of non-homogeneous microstructure on hydrogen diffusion and trapping simulations near a crack tip in a welded joint
spellingShingle Influence of non-homogeneous microstructure on hydrogen diffusion and trapping simulations near a crack tip in a welded joint
Díaz Portugal, Andrés
Hydrogen embrittlement
Fracture Mechanics
Hydrogen diffusion
Welding
Finite Element simulation
Resistencia de materiales
Strength of materials
title_short Influence of non-homogeneous microstructure on hydrogen diffusion and trapping simulations near a crack tip in a welded joint
title_full Influence of non-homogeneous microstructure on hydrogen diffusion and trapping simulations near a crack tip in a welded joint
title_fullStr Influence of non-homogeneous microstructure on hydrogen diffusion and trapping simulations near a crack tip in a welded joint
title_full_unstemmed Influence of non-homogeneous microstructure on hydrogen diffusion and trapping simulations near a crack tip in a welded joint
title_sort Influence of non-homogeneous microstructure on hydrogen diffusion and trapping simulations near a crack tip in a welded joint
dc.creator.none.fl_str_mv Díaz Portugal, Andrés
Cuesta Segura, Isidoro Iván
Rodríguez, C.
Alegre Calderón, Jesús Manuel
author Díaz Portugal, Andrés
author_facet Díaz Portugal, Andrés
Cuesta Segura, Isidoro Iván
Rodríguez, C.
Alegre Calderón, Jesús Manuel
author_role author
author2 Cuesta Segura, Isidoro Iván
Rodríguez, C.
Alegre Calderón, Jesús Manuel
author2_role author
author
author
dc.subject.none.fl_str_mv Hydrogen embrittlement
Fracture Mechanics
Hydrogen diffusion
Welding
Finite Element simulation
Resistencia de materiales
Strength of materials
topic Hydrogen embrittlement
Fracture Mechanics
Hydrogen diffusion
Welding
Finite Element simulation
Resistencia de materiales
Strength of materials
description Hydrogen assisted fracture near welds is the result of a combination of microstructural changes and the accumulation of hydrogen. With the aim of predicting local hydrogen concentrations, hydrogen redistribution near a crack tip is simulated using a Boundary Layer approach and diffusion modelling is modified by trapping phenomena. The simulated non-homogeneous geometry includes layers that reproduce weld metal, heat affected zones and base metal of a 2.25Cr-1Mo steel; mechanical and diffusion properties have been extracted from references. The hydrogen transport model here considered involves a stress dependency that affects local concentrations; thus, the possible interaction between constraint effects associated to a graded material with hydrogen entry and transport is studied. Results show that the constraint effect is not significative for the loading and for the widths assigned to the weld and the heat affected zones (2.5 to 5 mm); however, for the HAZ-centred crack, a higher hydrostatic peak and the corresponding increase in lattice hydrogen are found. A two-type trapping process is also simulated to reproduce simultaneously the effect of dislocation trapping and microstructure delayed diffusion. Hydrogen is weakly trapped in dislocations and it is added to the lattice concentration to obtain a measure of diffusible hydrogen near a crack tip while effective diffusivity is strongly reduced by deeply trapped hydrogen. Differences between environmental or internal hydrogen sources are expected to be more accurately captured because stress-dependent boundary conditions have been implemented for hydrogen uptake.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10259/5669
url http://hdl.handle.net/10259/5669
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Theoretical and Applied Fracture Mechanics. 2021, V. 112, 102879
https://doi.org/10.1016/j.tafmec.2020.102879
info:eu-repo/grantAgreement/MICINN/RTI2018-096070-B-C33/
dc.rights.none.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositorio Institucional de la Universidad de Burgos (RIUBU)
instname:Universidad de Burgos (UBU)
instname_str Universidad de Burgos (UBU)
reponame_str Repositorio Institucional de la Universidad de Burgos (RIUBU)
collection Repositorio Institucional de la Universidad de Burgos (RIUBU)
repository.name.fl_str_mv
repository.mail.fl_str_mv
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