Strength and Relaxation and Corrosion Resistance of Ultrafine-Grained Austenitic 08Kh18N10T Steel Produced by ECAP: II. Relaxation Properties and Intergranular Corrosion Resistance
V. I. Kopylov, V. N. Chuvil’deev, A. V. Nokhrin, N. A. Kozlova, M. K. Chegurov, N. V. Melekhin
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Abstract
The relaxation resistance and corrosion resistance of ultrafine-grained (UFG) steel 08Kh18N10T samples fabricated by equal-channel angular pressing (ECAP) at temperatures of 150 and 450°C are investigated. The UFG steel has a high macroelasticity limit and yield strength and exhibits a decrease in the Hall–Petch coefficient due to the fragmentation of δ-ferrite particles during ECAP. UFG steel samples are found to have 2–3 times higher relaxation resistance as compared to coarse-grained steel samples. ECAP is shown to increase the rate of general corrosion. Despite a decrease in the corrosion resistance, the UFG steel samples have high intergranular corrosion resistance. The decrease in the corrosion resistance of the UFG steel is found to be caused by an increase in the volume fraction of strain-induced martensite during ECAP.
期刊介绍：
Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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