The effect of hydrogen on strain hardening and fracture mechanism of high-nitrogen austenitic steel

International Seminar on Interdisciplinary Problems in Additive Technologies

材料科学;物理学

Maier, G.G.^1 ; Astafurova, E.G.^1 ; Melnikov, E.V.^1 ; Moskvina, V.A.^2 ; Vojtsik, V.F.^2 ; Galchenko, N.K.^1 ; Zakharov, G.N.^3

Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Akademichesky Avenue 2/4, Tomsk

634055, Russia^1

National Research Tomsk Polytechnic University, Lenina Avenue 30, Tomsk

634050, Russia^2

National Research Tomsk State University, Lenina Avenue 36, Tomsk

634050, Russia^3

关键词: Effect of hydrogen;    Electrochemical hydrogen charging;    Fracture analysis;    Fracture mechanisms;    Surface layers;    Tensile behaviors;    Uniform elongation;    Wear-resistant coating;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/140/1/012005/pdf
DOI  :  10.1088/1757-899X/140/1/012005

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

High-nitrogen austenitic steels are perspective materials for an electron-beam welding and for producing of wear-resistant coatings, which can be used for application in aggressive atmospheres. The tensile behavior and fracture mechanism of high-nitrogen austenitic steel Fe-20Cr-22Mn-1.5V-0.2C-0.6N (in wt.%) after electrochemical hydrogen charging for 2, 10 and 40 hours have been investigated. Hydrogenation of steel provides a loss of yield strength, uniform elongation and tensile strength. The degradation of tensile properties becomes stronger with increase in charging duration - it occurs more intensive in specimens hydrogenated for 40 hours as compared to ones charged for 2-10 hours. Fracture analysis reveals a hydrogen-induced formation of brittle surface layers up to 6 μm thick after 40 hours of saturation. Hydrogenation changes fracture mode of steel from mixed intergranular-transgranular to mainly transgranular one.