Abstract
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.
Highlights
Austenitic stainless steels are frequently used materials for industrial applications due to their high ductility at cryogenic temperatures and low aggressive environment embrittlement
The requirements of low costs have generated an interest in replacement of nickel and use nitrogen and manganese as alloying elements
An indubitable advantage of such materials could be their good strength to wear combined with resistivity to degradation in aggressive atmospheres, for instance, in hydrogen
Summary
Austenitic stainless steels are frequently used materials for industrial applications due to their high ductility at cryogenic temperatures and low aggressive environment embrittlement. It concerns mainly AISI 300-series Cr-Ni steels [1,2,3]. The presence of expensive alloying elements – nickel – and low yield stresses limit their use. The requirements of low costs have generated an interest in replacement of nickel and use nitrogen and manganese as alloying elements. The high-nitrogen Cr-Mn steels have good mechanical properties and corrosion resistance and could be of great interest for a wide range of industrial application – in particular, for producing wear-resistant coatings or items using electron-beam welding [4] or other methods of additive technologies. An indubitable advantage of such materials could be their good strength to wear combined with resistivity to degradation in aggressive atmospheres, for instance, in hydrogen
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