Hydrogen Embrittlement of Ph 13‐08 Mo Stainless Steel in PWR Environment Effects of Microstructure

Cloue, J-M.; Foucault, M.; Andrieu, Éric

doi:10.1002/9781118787618.ch15

Cited by 2 publications

(1 citation statement)

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“…Both studied maraging grades present a high susceptibility to HE (with a RRA strictly superior to 80%) and become brittle when submitted to hydrogen whatever metallurgical state, in line with their high mechanical properties [30]. It also explains partly why 550A states with hardening nanoprecipitates are more sensitive to HE compared to the solution-annealed state.…”

Section: Discussionmentioning

confidence: 60%

Hydrogen Embrittlement Characterization of 1.4614 and 1.4543 Martensitic Precipitation Hardened Stainless Steels

Latu-Romain,

Schutz,

Martin

et al. 2024

Metals

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Hydrogen embrittlement (HE) of 1.4614 and 1.4543 maraging stainless steels is characterized with fine structural TEM-ASTAR, hydrogen electrochemical permeation, thermodesorption and tensile testing (with slow strain rate during H cathodic charging) experiments. Both solutions annealed and 550 °C aged states are studied. When aged, 1.4614 grade contains nanometric hexagonal Ni3Ti precipitates whereas 1.4543 grade contains three families of nanometric precipitates, namely, hexagonal Ni3Ti, non fcc-rich Cu and G-phase rich in Si, Ti and Ni with cube-cube relations with martensite. From the permeation and thermodesorption results, it appears that austenite and nanometric precipitates seem to constitute deep traps for hydrogen in both grades. From tensile tests with in situ H charging, 1.4614 and 1.4543 maraging grades show a high susceptibility to HE with relative reduction of area (RRA) strictly superior to 80% for both metallurgical states. The presence of retained austenite does not seem to bring any HE resistance because of its transformation into martensite during deformation.

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Section: Discussionmentioning

confidence: 60%