Conclusions
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1.
Cast unstabilized steel 0Kh20N25M3D2S with 2.7% Si contains χ phase, with a composition of 19.4% Cr, 28.4% Fe, 20.5% Ni, 9.0% Mo, 4.0% Mn, and also copper and a considerable amount of silicon. The χ phase is retained in the structure up to a temperature of 1130°.
No χ phase is observed in the steel with 1.4% Si.
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2.
Steel 0Kh20N25M3D2S with 2.7% Si contains χ phase, σ phase, and phase of the M6C type after annealing at 950° for 25 h; after the same heat treatment, the steel with 1.4% Si contains only M6C phase, consisting of 29.8% Cr, 27.4% Ni, 19.6% Mo, 7.4% Si, and 5.7% Fe, with a lattice constanta=10.68 Å.
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3.
In cast steels of 0Kh23N28M3D3 type stabilized with titanium and niobium there are also titanium and niobium carbides and σ phase.
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Literature cited
A. V. Ryabchenkov, V. I. Gerasimov, and V. P. Sidorov, "The nature of corrosion cracking of austenitic steels and the basic factors affecting the process," Zashchita Metallov,2, 3, 257 (1966).
I. N. Yukalov, Castings of Chemically Resistant Alloys [in Russian], Mashinostroenie, Moscow (1964), p. 232.
N. I. Blok et al., "Methods of studying phase composition of alloys based on Ni−Cr," Zavod. Lab., 8, 903 (1954).
H. J. Goldschmidt, Interstitial Alloys [Russian translation], Vol. 1, Mir, Moscow (1971), p. 184.
N. M. Popova, Carbide Analysis of Steel [in Russian], Oborongiz, Moscow (1957).
Additional information
Scientific-Research Institute of Chemical Machine Construction. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 10–14, July, 1974.
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Akshentseva, A.P., Khakhlova, N.V., Yuganova, S.A. et al. Structure and phase composition of cast stainless steel 0Kh20N25M3D2S. Met Sci Heat Treat 16, 554–557 (1974). https://doi.org/10.1007/BF00651899
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DOI: https://doi.org/10.1007/BF00651899