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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Hydrogen embrittlement in super duplex stainless steels
AU - Liang, X.Z.
AU - Zhao, G.-H.
AU - Dodge, M.F.
AU - Lee, T.L.
AU - Dong, H.B.
AU - Rivera-Díaz-del-Castillo, P.E.J.
PY - 2020/3
Y1 - 2020/3
N2 - In super duplex stainless steels (SDSSs), both austenite and ferrite are susceptible to hydrogen embrittlement, however there is a lack of understanding into the effect of hydrogen in each phase. In this study, in neutron diffraction was applied on hydrogen-charged (H-charged) samples to investigate the hydrogen embrittlement behaviour in super duplex stainless steels. The result reveals that austenite maintains good plasticity during tensile testing, whilst a loss of it is realised in ferrite. Fractography analysis reveals the diffusion of hydrogen induced a brittle-to-ductile transition from the sample surface towards the centre; hydrogen embrittlement vanishes as the specimen’s centre is approached, while it is demonstrated to disappear first in austenite but not in ferrite. This transition can be predicted by applying a physics-based hydrogen embrittlement model which incorporates the effects of hydrogen concentration, hydrogen diffusivity, residual stress, loading state and temperature. The present work demonstrates the dissimilar susceptibility of austenite and ferrite to hydrogen embrittlement, providing a tool to describe it.
AB - In super duplex stainless steels (SDSSs), both austenite and ferrite are susceptible to hydrogen embrittlement, however there is a lack of understanding into the effect of hydrogen in each phase. In this study, in neutron diffraction was applied on hydrogen-charged (H-charged) samples to investigate the hydrogen embrittlement behaviour in super duplex stainless steels. The result reveals that austenite maintains good plasticity during tensile testing, whilst a loss of it is realised in ferrite. Fractography analysis reveals the diffusion of hydrogen induced a brittle-to-ductile transition from the sample surface towards the centre; hydrogen embrittlement vanishes as the specimen’s centre is approached, while it is demonstrated to disappear first in austenite but not in ferrite. This transition can be predicted by applying a physics-based hydrogen embrittlement model which incorporates the effects of hydrogen concentration, hydrogen diffusivity, residual stress, loading state and temperature. The present work demonstrates the dissimilar susceptibility of austenite and ferrite to hydrogen embrittlement, providing a tool to describe it.
KW - Hydrogen embrittlement
KW - Crack propagation
KW - Neutron diffraction
KW - Super duplex stainless steel (SDSS)
U2 - 10.1016/j.mtla.2019.100524
DO - 10.1016/j.mtla.2019.100524
M3 - Journal article
VL - 9
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
M1 - 100524
ER -