Abstrakti
Tensile tests in air with hydrogen pre-charged smooth specimens and slow strain rate tests with smooth and notched specimens in hydrogenated high-temperature water (HTW) at elevated temperatures (250−288 °C) on low-alloy reactor pressure vessel (RPV) steels revealed a softening in strength and a pronounced reduction in ductility, where the magnitude of hydrogen embrittlement (HE) increased with the dynamic strain ageing (DSA) susceptibility of the RPV steels. In hydrogen pre-charged specimens and in hydrogenated HTW, shear dominated transgranular fracture by microvoid coalescence with increasing amounts of macrovoids, quasi-cleavage regions and secondary cracking were observed. Thermal desorption spectroscopy showed an increase in the concentration of trapped hydrogen in high binding energy traps (vacancies & voids) induced by straining in DSA regime. The observed hydrogen effects on fracture behaviour is a consequence of plasticity localization resulting from the interaction between DSA and hydrogen. HESIV and HELP are the dominant HE mechanisms.
Alkuperäiskieli | Englanti |
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Artikkeli | 153161 |
Sivumäärä | 13 |
Julkaisu | Journal of Nuclear Materials |
Vuosikerta | 556 |
Varhainen verkossa julkaisun päivämäärä | 4 heinäk. 2021 |
DOI - pysyväislinkit | |
Tila | Julkaistu - 1 jouluk. 2021 |
OKM-julkaisutyyppi | A1 Julkaistu artikkeli, soviteltu |