Features of substructure formation on tempering Kh23K15T type alloys

Formation of structural morphology in alloys of the Kh23K15T type is accomplished in two heat treatment stages: from ITMT to the final tempering stage at 550–500°C. Depending on the conditions for carrying out stepwise heat treatment at different stages of forming a highly coercive condition it is possible to form different structural imperfections: composition inhomogeneity and secondary decomposition within α1 - and α1-phases. Secondary decomposition arises primarily in the case when with a change over from one tempering stage to another overcooling Δt exceeds 20°C. The most intense secondary decomposition develops at temperatures below 610°C with which the most intense separation of phases in chemical composition probably starts.