Hydrogen embrittlement of the additively manufactured Nb-free and Nb-alloyed austenitic steels

A comparative analysis of the effect of hydrogen-charging on the mechanical properties and fracture mechanisms of the Nb-free and Nb-alloyed austenitic steels produced by an additive manufacturing was carried out. Asbuilt steels possess different phase compositions: austenite and -ferrite (Nb-free s...

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Main Authors: Panchenko, Marina Yu, Melnikov, Evgenii V., Astafurov, Sergey V., Moskvina, Valentina A., Reunova, Kseniya A., Maier, Galina G., Chumaevskii, Andrey V., Kolubaev, Evgenii A., Astafurova, Elena G.
Format: Conference Proceeding
Language:English
Subjects:
Additive manufacturing
Alloying
Austenite
Austenitic stainless steels
Ferrite
Fracture mechanics
Hydrogen
Hydrogen charging
Hydrogen embrittlement
Mechanical properties
Phase composition
Steel
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Summary:A comparative analysis of the effect of hydrogen-charging on the mechanical properties and fracture mechanisms of the Nb-free and Nb-alloyed austenitic steels produced by an additive manufacturing was carried out. Asbuilt steels possess different phase compositions: austenite and -ferrite (Nb-free steel) and austenite, □-ferrite and Nb-enriched phases (Nb-alloyed steel). After hydrogen-charging, the yield strength increases, and the plasticity of both steels is reduced. The Nb-alloying increases the resistance of the steel against hydrogen embrittlement. The hydrogen embrittlement index and thickness of the brittle hydrogen-affected layer in Nb-alloyed steel (IH = 10%, DH = 18 ± 5 µm) are lower than those in Nb-free steel (IH = 17%, DH = 35 ± 7 µm). The Nb-assisted changes in the microstructure and phase composition in the additively manufactured austenitic steel leads to a change in the fracture mechanisms of the hydrogen-affected layer.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0084703