Abstract
The deformation behavior of high-chromium stainless steel of sorbitic structure upon high-temperature tempering and of electrically saturated with hydrogen in the electrochemical cell during 12 hours is investigated. The stress-strain curves for each state were obtained. From the stress-strain curves, one can conclude that hydrogen markedly reduces the elongation to the fracture of specimen. Using double-exposed speckle photography method it was found that the plastic flow of the material is of a localized character. The pattern distribution of localized plastic flow domains at the linear hardening stage was investigated. Comparative study of autowave parameters was carried out for the tempered steel as well as the electrically saturated with hydrogen steel.
Highlights
In recent years, we have found experimentally for a range of metals and alloys that plastic deformation at all its stages is prone to localization [1,2]
The localization patterns observed are wave-like in character; the kind of wave depends on the acting law of work hardening, that is, the form of function
There are only four of them: single deformation fronts move in the easy glide stage for single crystals and in a yield plateau for polycrystals; a system of equidistant mobile localized-strain centers in the linear hardening stage; spacio-periodic structure of plastic strain localization regions in the Taylor parabolic work hardening stage, and the structure of nonuniform mobile strain-localization regions peculiar to the final deformation stage
Summary
We have found experimentally for a range of metals and alloys that plastic deformation at all its stages is prone to localization [1,2]. There are only four of them: single deformation fronts move in the easy glide stage for single crystals and in a yield plateau for polycrystals; a system of equidistant mobile localized-strain centers in the linear hardening stage; spacio-periodic structure of plastic strain localization regions in the Taylor parabolic work hardening stage, and the structure of nonuniform mobile strain-localization regions peculiar to the final (prefracture) deformation stage These surveys of the localized-strain pattern features for the high-chromium stainless steel widely used in water-vapor, aquatic and acid environments, provide means of getting more information about material behavior being part of a critical structure.
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