Conclusions
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1.
When the degree of deformation of cold-rolled steel increases, the temperature Ac1 decreases intensely only up to a certain degree of deformation, and when this degree is exceeded, it leads to a less substantial decrease of Ac1. The fractionality of the deformation does not affect the position of the point Ac1.
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2.
Intense decrease of Ac1 occurs only in that range of degrees of deformation in which the dispersity of the cellular dislocation structure, determined by the cell size, increases. When the cell size is stabilized, the temperature Ac1 decreases much less with increasing degree of deformation.
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Literature Cited
S. S. D'yachenko, V. P. Tarabanova, V. S. D'yachenko, and A. M. Petrichenko, Dokl. Akad. Nauk SSSR,191, No. 3, 561–564 (1970).
A. Yu. Bratashevskii and S. S. D'yachenko, "The effect of the dislocation structure of steel 20 on the position of the critical point Ac1," in: Problems of Metal Science and of Heat Treatment of Metals, No. 196, Perm State Univ. (1977), pp. 30–33.
A. Yu. Bratashevskii and A. I. Khristoforov, "The effect of the heating rate of cold-rolled steel on the position of the critical point Ac1," Deposited at the All-Union Institute of Scientific and Technical Information, Moscow (1982), No. 11, p. 108.
Additional information
Kharkov Polytechnic Institute. Ukrainian Research Institute of Metallurgy (UkrNIIMET). Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 12–13, June, 1984.
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Bratashevskii, A.Y., Khristoforov, A.I. Position of the critical point Ac1 after cold rolling of steel 25. Met Sci Heat Treat 26, 417–418 (1984). https://doi.org/10.1007/BF00707705
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DOI: https://doi.org/10.1007/BF00707705