Conclusions
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1.
The structure of cold-rolled strip (ε=97%) of hard magnetic Fe−Cr−Ni steel of the 18-9 type was examined in thin foil by means of transmission electron microscopy. Three elements of the structure occurring simultaneously were discerned — a biphase banded structure, biphase regions of fine fragments, and untransformed austenite. The sizes of these individual structural components were estimated.
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2.
It was concluded on the basis of the structural elements and electron-diffraction data that crystals of strain martensite are grouped in packets with interlayers of austenite during rolling of 18-9 steel.
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3.
It is possible for the isothermal martensitic transformation to occur in hard magnetic 18-9 steel during slow cooling from austenitizing temperature and rest.
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4.
It follows from an analysis of the dilatometric curves and measurements of the saturation magnetization that additional γ→α transformation may occur in cold-worked 18-9 steel during tempering at temperatures of 370–380°. Equiaxed particles of austenite free of dislocations are formed beginning at 480° and the original cold-worked structure is polygonized in the process of heating.
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Additional information
I. P. Bardin Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 8–12, June, 1978.
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Lur'e, S.A., Potapov, N.N. & Demin, E.A. Structure and phase transformations in cold-worked Fe−18Cr−9Ni steel. Met Sci Heat Treat 20, 440–444 (1978). https://doi.org/10.1007/BF00773980
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DOI: https://doi.org/10.1007/BF00773980