31 research outputs found
The effect of hydrogen on strain hardening and fracture mechanism of high-nitrogen austenitic steel
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 [mu]m thick after 40 hours of saturation. Hydrogenation changes fracture mode of steel from mixed intergranular-transgranular to mainly transgranular one
THE EFFECT OF ANNEALING ON STRUCTURAL AND PHASE TRANSFORMATIONS, REGULARITIES OF GRAIN GROWTH IN HIGH-MANGANESE AUSTENITIC STEELS WITH A MICROSTRUCTURE CONTAINING HIGH DENSITY OF TWIN BOUNDARIES
The effect of annealing on structural and phase transformations, regularities of grain growth in austenitic steels Fe-13Mn-1,3C, Fe-13Mn-2,7Al-1,3C, Fe-28Mn-2,7Al-1,3C (wt. %) with different stacking fault energieswas studied, in whichthe nanostructured states with high density of twin boundaries were produced by high-pressure torsion.Изучено влияние высокотемпературных отжигов на структурно.фазовые превращения и закономерности роста зернав аустенитных сталях Fe.13Mn.1,3C, Fe.13Mn.2,7Al.1,3C, Fe.28Mn.2,7Al.1,3C (мас. %) с разной энергией дефекта упаковки, в которых методом кручения под высоким давлением сформированы наноструктурные состояния с высокой плотностью двойниковых границ.Работа выполнена при поддержке Российского научного фонда (проект № 18-79-00149). Авторы благодарны профессору Ю. И. Чумлякову за монокристаллы сталей, предоставленные для исследований
Microstructural inhomogeneity of phase composition and grain structure in electron beam wire-feed additive manufactured AISI 304 stainless steel
A comparative study of the macroscopical and microscopical fracture mechanisms in cast and additively manufactured austenitic stainless steels
The features of hydrogen embrittlement of electron beam additive manufactured austenitic steel
An effect of ion-plasma nitriding on the microstructure and phase composition of additively-manufactured AISI 321 stainless steel
The effect of solution treatment regime on temperature dependence of 0.2% offset yield strength in V-alloyed highnitrogen austenitic steel
The effect of hydrogen-charging on mechanical properties and fracture mechanisms of wire-feed electron beam additive manufactured austenitic steel
The effect of a composition of a saturating gas in ion-plasma treatment on surface layer properties in austenitic stainless steel
The Effect of Volume Fraction of Δ-Ferrite on Hydrogen Embrittlement in High-Nitrogen Austenitic Steel
The effect of volume fraction of δ-ferrite and the density of interphase (austenite/δ-ferrite) and grain (austenite/austenite) boundaries on the mechanical properties and fracture mechanisms of a high-nitrogen austenitic steel before and after hydrogen electrolytic charging for 100 h was investigated. An increase in the density of interphase and grain boundaries and decrease in fraction of δ-ferrite increase the resistance of steel against hydrogen embrittlement.Было исследовано влияние объемной доли δ-феррита и плотности межфазных (аустенит/δ-феррит) и межзеренных границ (аустенит/аустенит) на механические свойства и механизмы разрушения высокоазотистой аустенитной стали до и после электролитического наводороживания. Увеличение плотности межфазных и межзеренных границ и уменьшение доли феррита приводит к повышению устойчивости стали и водородному охрупчиванию.Работа выполнена при финансовой поддержке Российского научного фонда (грант № 17–19–01197)