Conclusions
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1.
As a structural criterion in nondestructive testing of the quality of hardening and tempering of parts of 58 (55PP) and 47GT steels on the basis of magnetic properties the selection of the excess ferrite content in the structure of the steel is recommended.
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2.
With the use of the recommended structural criterion the most reliable results for inspection of steel parts may be obtained with selection of magnetic permeability as the inspection characteristic.
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Literature cited
V. M. Morozova and M. N. Mikheev, in: Electromagnetic Methods of Inspection of Part Quality [in Russian], Sredne-Ural. Knizh. Izd-vo, Sverdlovsk (1965), p. 3.
S. V. Vonsovskii, Magnetism [in Russian], Nauka, Moscow (1971).
Additional information
I. A. Likhachev Moscow Automobile Plant, Production Union. Plant Higher Technical School at I. A. Likhachev Automobile Plant. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 12–14, July, 1984.
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Kisin, V.N., Kovrigin, V.A. & Kulikova, N.A. Magnetic properties and electrical conductivity of 58 (55PP) and 47GT steels after hardening and tempering. Met Sci Heat Treat 26, 489–492 (1984). https://doi.org/10.1007/BF00706701
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DOI: https://doi.org/10.1007/BF00706701