The effect of solid-solution temperature on phase composition, tensile characteristics and fracture mechanism of V-containing CrMn-steels with high interstitial content C+N>1 mass. %

On Temperature Dependence of Microstructure, Deformation Mechanisms and Tensile Properties in Austenitic Cr-Mn Steel with Ultrahigh Interstitial Content C + N = 1.9 Mass.%

“…The latter is obviously associated with the temperature dependence of the different strengthening components and with the change in their ratio. Assuming several basic components, the solid-solution hardening σ SS , particle strengthening σ PS and grain size (Hall-Petch) strengthening σ HP , we have estimated their impact to the yield strength for room temperature deformation of UHIS in our previous research [39]. The increase in solid-solution temperature from 1100 • C up to 1230 • C is accompanied with concurrent hardening and softening effects.…”

“…Specimens for study the temperature dependence of tensile properties and fracture micromechanisms were subjected to 1-h solid-solution treatment (SST) at different temperatures (T SST )-1100 • C, 1200 • C and 1230 • C with a subsequent quenching into water of room temperature. According to our previous research, these SSTs provide different ratios of solid-solution, grain boundary and dispersion hardening components [39]. These specimens were tested in the temperature range (T MT -the temperature of the mechanical test) from −60 to +60 • C with the initial strain rate of 5 × 10 −4 s −1 .…”

“…They are morphologically similar to discontinuous decomposition cells typical for high-nitrogen austenite steels in age-hardening. The effect of SST on phase composition and structural parameters was described in detail in our previous research [39]. These data are summarized in Table 1.…”

“…Alloying of HNSs with 1.5% vanadium increases strength and ductility of these steels due to formation of fine-grained structure and precipitation hardening with VN and V(C,N) phases [35][36][37][38]. Moreover, vanadium increases the solubility of nitrogen in steels [9] and ultrahigh-interstitial CrMn steels with the concentrations of C + N = 1.2 mass.% and C + N = 1.9 mass.% have been previously designed [39]. Nevertheless, there is still a lack of experimental data on the complex influence of two factors (solid-solution hardening due to C+N alloying and precipitation hardening due to alloying with vanadium) on the temperature dependence of the strength properties and fracture mechanisms, particularly for ultrahigh interstitial content (C + N > 1 mass.%).…”

Effect of heat treatment process on precipitation of V microalloyed steel

“…In the past, there has been a continued push to produce high-strength structural steels at lower expenditure, and microalloyed steels have moved in several directions [10,11]. For low-carbon and low-alloy steels, the addition of Cr, Ti, Nb, V, and other alloying elements form precipitates at the grain boundaries and phase interfaces, and can further refine these grains are needed in order to obtain a final morphology that provides better performance [12][13][14][15][16][17].…”