Abstract
The structure of nickel-free duplex steel based on the Cr-Mn-Mo system with a high nitrogen content (0.34% N), formed as a result of heat treatment in accordance with various quenching and aging schemes, is investigated. Used methods of metallography, x-ray phase analysis and hardness measurements. During heat treatment, austenite and ferrite of the studied steel underwent decomposition with the formation of nitride and intermetallic phases, and also underwent polymorphic transformations. Separation of ferrite was also observed with the formation of a chromium-enriched phase (αCr). The duplex structure of the studied steel (with a content of each phase of about 47%) was obtained after quenching from 1150° C and thermal exposure at a temperature of about 700° C for one hour.
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