2026-04-28T08:54:52Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/73102023-01-25T08:28:48Zcom_10259_4201com_10259_5086com_10259_2604col_10259_4505
Díaz Portugal, Andrés
147
600
0000-0002-2344-1955
Cuesta Segura, Isidoro Iván
135
600
0000-0003-4088-9302
Martínez Pañeda, Emilio
0e268b17-776b-4013-868b-7f8417bf1088
600
Alegre Calderón, Jesús Manuel
16
600
0000-0003-3629-2570
2023-01-24T12:51:56Z
2023-01-24T12:51:56Z
2020-05
0376-9429
http://hdl.handle.net/10259/7310
10.1007/s10704-019-00411-8
1573-2673
The electrochemical permeation test is one of the most used methods for characterising hydrogen diffusion in metals. The flux of hydrogen atoms registered in the oxidation cell might be fitted to obtain apparent diffusivities. The magnitude of this coefficient has a decisive influence on the kinetics of fracture or fatigue phenomena assisted by hydrogen and depends largely on hydrogen retention in microstructural traps. In order to improve the numerical fitting of diffusion coefficients, a permeation test has been reproduced using FEM simulations considering two approaches: a continuum 1D model in which the trap density, binding energy and the input lattice concentrations are critical variables and a polycrystalline model where trapping at grain boundaries is simulated explicitly including a segregation factor and a diffusion coefficient different from that of the interior of the grain. Results show that the continuum model captures trapping delay, but it should be modified to model the trapping influence on the steady state flux. Permeation behaviour might be classified according to different regimes depending on deviation from Fickian diffusion. Polycrystalline synthetic permeation shows a strong influence of segregation on output flux magnitude. This approach is able to simulate also the short-circuit diffusion phenomenon. The comparison between different grain sizes and grain boundary thicknesses by means of the fitted apparent diffusivity shows the relationships between the registered flux and the characteristic parameters of traps.
The authors gratefully acknowledge financial support from the project MINECO Refs: MAT2014-58738-C3-2-R and RTI2018-096070-B-C33. E. Martínez-Pañeda acknowledges financial support from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (FP7/2007-2013) under REA Grant Agreement No. 609405 (COFUNDPostdocDTU).
application/pdf
eng
Springer Nature
International Journal of Fracture. 2020, V. 223, n. 1-2, p. 17-35
https://doi.org/10.1007/s10704-019-00411-8
info:eu-repo/grantAgreement/MINECO//MAT2014-58738-C3-2-R/ES/DISEÑO DE RECIPIENTES DE ACERO DE ALTA Y MEDIA RESISTENCIA RESISTENTES A LA FRACTURA Y FATIGA PARA CONTENER HIDROGENO A PRESION
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-096070-B-C33/ES/DESARROLLO Y VALIDACION DE MODELOS DE FRAGILIZACION ASISTIDA POR HIDROGENO PARA SU APLICACION AL DISEÑO DE RECIPIENTES SOLDADOS Y SOMETIDOS A ALTAS PRESIONES
info:eu-repo/grantAgreement/EC/FP7/609405/EU/HC Ørsted Postdoc, cofunded by Marie Curie Actions/
Hydrogen diffusion
Permeation test
Finite element simulation
Grain boundary trapping
Ingeniería mecánica
Materiales
Ensayos (Tecnología)
Mechanical engineering
Materials
Testing
Analysis of hydrogen permeation tests considering two different modelling approaches for grain boundary trapping in iron
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
info:eu-repo/semantics/openAccess
International Journal of Fracture
223
THUMBNAIL
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Diaz-ijf_2020.pdf
Diaz-ijf_2020.pdf
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10259/7310
oai:riubu.ubu.es:10259/7310
2023-01-25 09:28:48.39
Repositorio Institucional de la Universidad de Burgos
bubrep@ubu.es
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