Abstract
The features of microstructure of 12% chromium ferritic-martensitic steels, EK-181 (Fe–12Cr–2W–V–Ta–B) and ChS-139 (Fe–12Cr–Ni–Mo–W–Nb–V–B), after heat treatments providing different levels of strength and plastic properties are investigated. A theoretical analysis of a number of strengthening mechanisms of these steels, depending on the conditions of heat treatment, is carried out. It is shown that dispersion hardening by MX carbonitride nanoparticles is one of the most effective ways of increasing the strength of ferritic-martensitic steels under study.
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