It was established that the basic scheme of the decomposition of δ-ferrite during tempering of austenitic-ferritic steels is δ→M23C6+δ; δ→γ′+δ; δ→σ+γ″. Depending on the composition of the steel and the heat treatment, any of the three phases may be formed first — M23C6, γ′, or σ.
Because of the high rate of embrittlement of steel 0Kh20N11M3BT (particularly cold-worked), slow heating and cooling in the temperature range where σ-phase is formed must be avoided during heat treatment.
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Sokol, I.Y., Frid, Y.L. Decomposition of δ-ferrite during tempering of steels 08Kh19N9F2S2 and 0Kh20N11M3BT (ÉP89). Met Sci Heat Treat 10, 361–364 (1968). https://doi.org/10.1007/BF00650624
- Heat Treatment
- Basic Scheme
- Slow Heating