The peculiarities of hydrogen embrittlement of Nb-alloyed stainless steel fabricated by electron-beam additive manufacturing

Marina Yu Panchenko, Galina G. Maier, Evgenii V. Melnikov, Valentina A. Moskvina, Kseniya A. Reunova, Sergey V. Astafurov, Valery E. Rubtsov, Evgenii A. Kolubaev, Elena G. Astafurova

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The peculiarities of hydrogen embrittlement of niobium-alloyed austenitic stainless steel produced by wire-feed electron-beam additive manufacturing (EBAM) method have been investigated. After EBAM-growth, the Nb-alloyed steel has had macroscopically and microscopically heterogeneous structure, which has been characterized by austenitic matrix with colonies of ferritic dendrites and Nb-enriched precipitates. Hydrogen-charging causes the increase in the yield strength and the ultimate tensile stress of EBAM-produced specimens relative to hydrogen-free specimens and assists to surface brittle cracking of the specimens. Fracture surface in hydrogen-charged specimens includes several characteristic regions: surface brittle layers (20-25 ȝm) fractured both in transgranular and intergranular modes, subsurface hydrogen-affected zone (35-45 ȝm) with elongated dimples and flat facets (transgranular mode), and ductile central part with dimple micromechanism of fracture (transgranular mode).

Original languageEnglish
Title of host publicationProceedings of the International Conference on Physical Mesomechanics. Materials with Multilevel Hierarchical Structure and Intelligent Manufacturing Technology
EditorsVictor E. Panin, Vasily M. Fomin
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440463
DOIs
Publication statusPublished - 14 Dec 2020
Externally publishedYes
EventInternational Conference on Physical Mesomechanics. Materials with Multilevel Hierarchical Structure and Intelligent Manufacturing Technology 2020 - Tomsk, Russian Federation
Duration: 5 Oct 20209 Oct 2020

Publication series

NameAIP Conference Proceedings
Volume2310
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Conference on Physical Mesomechanics. Materials with Multilevel Hierarchical Structure and Intelligent Manufacturing Technology 2020
CountryRussian Federation
CityTomsk
Period5.10.209.10.20

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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