Effect of thermal stresses and phase transformations on the strength of Ticonal alloy
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Large magnets with a section over 4 cm2 must be transferred very quickly from the isothermal bath (furnace) to the tempering furnace without being allowed to cool—in 5–10 sec. Large magnets cannot be cooled to room temperature in air after isothermal thermomagnetic treatment.
When Ticonal alloys with γ phase are cooled from temperatures above 900°, ferromagnetic and structural transformations occur at 350-150°. The latter is accompanied by an increase in volume and stresses due to the phase transformation.
A concentration of 20–50 vol. % dispersed γ phase in the Ticonal alloy greatly strengthens it, while a small amount (0.5–2 vol.%) weakens it (in this case the γ phase is precipitated in the grain boundaries).
KeywordsFurnace Phase Transformation Thermal Stress Structural Transformation Large Magnet
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- 1.Permanent Magnets. Handbook [in Russian], Énergiya, Moscow (1971), p. 256.Google Scholar
- 2.G. A. Martynov, "Machining previously heated magnetic alloys", in: Investigation of Hard Magnetic Alloys and Magnetic Systems [in Russian], No. 33, Saratov (1968), p. 45.Google Scholar
- 3.E. I. Kazantsev, Commercial Furnaces. Handbook [in Russian], Metallurgiya, Moscow (1964), p. 54.Google Scholar
- 4.I. G. Lyapichev et al., "Composition, magnetic properties, and machinability of Fe−Ni−Al−Co−Ti alloys", in: Designing Power Supply and Electrically Driven Equipment [in Russian], Vol. 2, Énergiya, Moscow (1973).Google Scholar
- 5.A. Koch, M. Steeg, and K. Vos, Stahleisen, Düsseldorf Verlag, MBH (1960).Google Scholar
- 6.E. Planchard, R. Meyer, and G. Bronner, Z. Ang. Phys.,17, No. 3, 175 (1964).Google Scholar
- 7.E. G. Povolotskii, "Structural characteristics of a Ticonal alloy with high-temperature decomposition", in: Metal Physics [in Russian], Naukova Dumka, Kiev (1975), p. 56.Google Scholar
- 8.R. P. Leshchinskaya, "Structure of γ phase in alloys of the YuNDK and YuNDKT types", Metalloved. Term. Obrab. Met., No. 2, 52 (1974).Google Scholar