Влияние продолжительности старения на механические свойства и фазовый состав высокоазотистой аустенитной стали

Abstract

The effect of age-hardening at a temperature of 700°С for 0.5-50 hours on mechanical properties and phase composition of high-nitrogen V-alloyed austenitic steel Fe-19Cr-22Mn-1,5V-0,3C-0,9N was investigated. After solid-solution treatment (1200°С, 30 min) steel possesses austenitic structure with coarse (V,Cr)(С,N) particles. Age-hardening at 700°С for 0.5-50 hours leads to discontinuous precipitation of chromium nitrides, which cause an increase in yield strength and a decrease in ductility. Aging at 700°С for 50 h results in formation of an intermetallic σ-phase, it leads to a sharp decrease in ductility.