Email this article THE INFLUENCE OF HYDROGEN-CHARGING REGIME ON THE STRAIN HARDENING AND FRACTURE MECHANISM OF HIGH-NITROGEN STEEL
- Authors: Moskvina V.A.1, Astafurova E.G.2, Mayer G.G.2, Melnikov E.V.2, Galchenko N.K.2
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Affiliations:
- National Research Tomsk Polytechnic University, Tomsk
- Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk
- Issue: No 4 (2017)
- Pages: 75-82
- Section: Technical Sciences
- URL: https://vektornaukitech.ru/jour/article/view/415
- DOI: https://doi.org/10.18323/2073-5073-2017-4-75-82
- ID: 415
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Abstract
The nitrogen-containing austenitic steels are the advanced alloys, which are widely used as constructional materials, in the hydrogen energetics as well. The high-nitrogen stainless steels have high strength properties and plasticity and are resistant to localized corrosion. However, in spite of the increased attention of researchers to the issues of hydrogen embrittlement of materials, the combined effect of hydrogen and nitrogen on the austenitic steels’ properties is a poorly explored area. In this paper, the authors studied the influence of electrolytic hydrogen-charging regime with a saturation time up to 43 hours on the strain hardening and the deformation and fracture mechanisms during the uniaxial tension of Fe-17Cr-24Mn-1.3V-0.2C-0.8N nitrogen-containing stainless steel. It is found that hydrogen saturation effects slightly on the staging of flow curves and the ultimate tensile strength and contributes to the slight reduction in the yield stress and substantial decrease in the rupture elongation of steel. In this case, the high-nitrogen austenitic steel has a good margin of plasticity (δ=11 %) and high strength properties (σ0.2=1190 MPa) even after 43 hours of hydrogen saturation. The nature of fracture of austenitic steel in the initial state and after hydrogen charging under various modes is characterized as a ductile transcrystalline fracture. In the result of hydrogen saturation, a brittle layer of 3-5 μm in thickness is formed on the surface of high-nitrogen steel samples, which fractures according to the quasi-cleavage mechanism and provides the intensive cracking of side surfaces of samples during deformation. After the electrolytic hydrogen charging of 37 and 43 hours of duration, along with the slip, one of the main mechanisms of austenitic steel deformation during tensile tests is the mechanical twinning. Hydrogenation contributes to the mechanical deformation twinning, accompanied by shear microlocalization and activation of γ→ɛ martensitic transformation.
About the authors
Valentina Aleksandrovna Moskvina
National Research Tomsk Polytechnic University, Tomsk
Author for correspondence.
Email: valya_moskvina@mail.ru
graduate student, engineer
Russian FederationElena Gennadievna Astafurova
Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk
Email: elena.g.astafurova@gmail.com
Doctor of Sciences (Physics and Mathematics), Associate Professor, leading researcher
Russian FederationGalina Gennadievna Mayer
Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk
Email: fake@neicon.ru
PhD (Physics and Mathematics), junior researcher
Russian FederationEvgeniy Vasilievich Melnikov
Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk
Email: melnickow-jenya@yandex.ru
junior researcher
Russian FederationNina Konstantinovna Galchenko
Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk
Email: nkgalchenko@gmail.com
PhD (Engineering), senior researcher
Russian FederationReferences
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