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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/7374

    Título
    SPT analysis of hydrogen embrittlement in CrMoV welds
    Autor
    Álvarez, G.
    Zafra, A.
    Rodríguez, C.
    Belzunce, J.
    Cuesta Segura, Isidoro IvánUBU authority Orcid
    Publicado en
    Theoretical and Applied Fracture Mechanics. 2020, V. 110, 102813
    Editorial
    Elsevier
    Fecha de publicación
    2020-12
    ISSN
    0167-8442
    DOI
    10.1016/j.tafmec.2020.102813
    Abstract
    In this paper Small Punch Tests (SPT) are used to determine the mechanical properties of the heat affected zone (HAZ) of CrMoV welded joints and to evaluate the embrittlement caused by the presence of internal hydrogen. Hydrogen permeation tests were carried out to determine the effective diffusion coefficients of the different regions of welded joints, whose hydrogen contents were measured using a hydrogen analyser. The paper demonstrates that SPTs can be used to estimate the tensile properties and the toughness of small areas, such as the subzones of a welded joint which are not thick enough for machining standard specimens. In cases where it is not possible to determine the fracture toughness of brittle regions using standard SPT samples, tests using longitudinally notched SPT samples were conducted. The normalized energy at failure, , was selected as the most appropriate SPT parameter to estimate the fracture toughness regardless of the fracture behaviour of the material (ductile or brittle). It was seen that the fracture toughness of the fine grained HAZ (FG-HAZ) is similar to that of the Base Metal (BM), while the fracture toughness of the coarse grained HAZ (CG-HAZ) is more similar to that of the Weld Metal (WM). The effect of hydrogen on BM and FG-HAZ is low, with embrittlement indexes of about 20%. However, a strong effect of hydrogen was observed in CG-HAZs and WMs, with embrittlement indexes of 60–80%. and a clear change from ductile to brittle behaviour in their fracture surfaces.
    Palabras clave
    Hydrogen embrittlement
    Fracture
    Small punch test
    Weld
    Materia
    Ingeniería mecánica
    Mechanical engineering
    Resistencia de materiales
    Strength of materials
    Ensayos (Tecnología)
    Testing
    URI
    http://hdl.handle.net/10259/7374
    Versión del editor
    https://doi.org/10.1016/j.tafmec.2020.102813
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