Hydrogen Embrittlement of Austenitic Stainless Steels with Ultrafine-Grained Structures of Different Morphologies
- Authors: Astafurova E.G.1, Melnikov E.V.1, Astafurov S.V.1, Ratochka I.V.1, Mishin I.P.1, Maier G.G.1, Moskvina V.A.1,2, Zakharov G.N.1, Smirnov A.I.3, Bataev V.A.3
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Affiliations:
- Institute of Strength Physics and Materials Science, Siberian Branch
- National Research Tomsk Polytechnic University
- Novosibirsk State Technical University
- Issue: Vol 22, No 4 (2019)
- Pages: 313-326
- Section: Article
- URL: https://journals.rcsi.science/1029-9599/article/view/192722
- DOI: https://doi.org/10.1134/S1029959919040076
- ID: 192722
Cite item
Abstract
The paper studies the effect of electrolytic hydrogen charging on the plastic flow, strength properties, ductility, and fracture mechanisms in austenitic stainless steels Cr17Ni13Mo3C0.01, Cr18Ni10TiC0.12, and Cr18Ni9C0.17 with different stacking fault energies. The investigated steels are subjected to warm ABC-pressing and thermomechanical processing, including cold rolling and annealing, to produce the ultrafine-grained structure of different morphologies, such as ultrafine-grained (submicrocrystalline), misoriented grain-subgrain and mixed (grain and subgrain) structures of submicron scale. The strength properties of the steels after warm pressing and rolling with annealing exceed 3.5–6.0 times the properties of the quenched steels with coarse-grained structure. Electrolytic hydrogen charging of the studied steels with submicron-sized structure reduces the yield strength irrespective of the grain/subgrain size, structure, steel composition, and its stacking fault energy. The formation of a highly defective grain-subgrain structure with high dislocation density suppresses the effect of hydrogen embrittlement in Cr17Ni13Mo3C0.01 and Cr18Ni10TiC0.12 steels, in which no or a small volume fraction of strain-induced α′ martensite forms in tension. The tempering of the highly defective structure and the formation of a large fraction of high-angle misorientations in the stable Cr17Ni13Mo3C0.01 steel enhances the effect of hydrogen embrittlement in the specimens as compared to the specimens with a grain-subgrain structure with a high density of dislocations and low-angle boundaries. The hydrogen embrittlement effects are most pronounced in ultrafine-grained (submicrocrystalline) Cr18Ni10TiC0.12 and Cr18Ni9C0.17 steels with predominantly grain structure, which undergo induced γ→α′ phase transformation.
About the authors
E. G. Astafurova
Institute of Strength Physics and Materials Science, Siberian Branch
Author for correspondence.
Email: elena.g.astafurova@gmail.com
Russian Federation, Tomsk, 634055
E. V. Melnikov
Institute of Strength Physics and Materials Science, Siberian Branch
Email: elena.g.astafurova@gmail.com
Russian Federation, Tomsk, 634055
S. V. Astafurov
Institute of Strength Physics and Materials Science, Siberian Branch
Email: elena.g.astafurova@gmail.com
Russian Federation, Tomsk, 634055
I. V. Ratochka
Institute of Strength Physics and Materials Science, Siberian Branch
Email: elena.g.astafurova@gmail.com
Russian Federation, Tomsk, 634055
I. P. Mishin
Institute of Strength Physics and Materials Science, Siberian Branch
Email: elena.g.astafurova@gmail.com
Russian Federation, Tomsk, 634055
G. G. Maier
Institute of Strength Physics and Materials Science, Siberian Branch
Email: elena.g.astafurova@gmail.com
Russian Federation, Tomsk, 634055
V. A. Moskvina
Institute of Strength Physics and Materials Science, Siberian Branch; National Research Tomsk Polytechnic University
Email: elena.g.astafurova@gmail.com
Russian Federation, Tomsk, 634055; Tomsk, 634050
G. N. Zakharov
Institute of Strength Physics and Materials Science, Siberian Branch
Email: elena.g.astafurova@gmail.com
Russian Federation, Tomsk, 634055
A. I. Smirnov
Novosibirsk State Technical University
Email: elena.g.astafurova@gmail.com
Russian Federation, Novosibirsk, 630073
V. A. Bataev
Novosibirsk State Technical University
Email: elena.g.astafurova@gmail.com
Russian Federation, Novosibirsk, 630073