Conclusions
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1.
The chemical composition, the initial charge materials, the cross section dimensions, and the initial state of the samples have an influence on the α→α+γ decomposition in magnetically hard iron — chromium — cobalt alloys.
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2.
Chromium, aluminum, niobium, vanadium, silicon, and especially vanadium and silicon together increase the minimum incubation period for the α→α+γ decomposition, and cobalt decreases it.
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3.
Increasing the cross section of the samples raises the temperature of the minimum incubation period and the location of the upper branches of the isothermal curves for the start of decomposition.
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4.
A preliminary homogenization of the samples (at 1300°C) retards the α→α+γ decomposition.
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5.
Alloys melted with a charge containing ferrochromium FKh002A or FKh003A are more stable toward decomposition than alloys melted with a charge using chromium Kh0 or electrolytic chromium.
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Literature cited
H. Kaneko, Kinzoku,42, No. 1, 106 (1972).
H. Kaneko and K. Sizuki, Kinzoku,44, No. 9, 25 (1974).
G. P. Dement'eva et al., "Phase transformations in Fe−Cr−Co alloy in the temperature range of 600–1300°C," Izv. Vyssh. Uchebn. Zaved., Chern. Metall., No. 5, 149 (1976).
N. I. Mikheev, "High temperature transformation in the magniko alloys," Izv. Severo-Kavkazskovo Nauchnovo Tsentra Vysshel Shkoly. Seriya Tekhnicheskikh Nauk, No. 4, 66 (1974).
A. P. Gulyaev, Metal Science [in Russian], Metallurgiya, Moscow (1977).
Additional information
Novocherkasskii Scientific-Research Institute for Permanent Magnets. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 48–50, December, 1980.