The kinetics of isothermal formation of packet martensite in Fe – Ni alloys is considered. Atheory describing the formation of a packet of martensite crystals is presented as an autocatalytic process initiated by formation of the first laths of a future packet and of blocks in it. The theory predicts progressive change of the “instantaneous” exponent of power in the Avrami equation from 2 or 3 to 1, which has been observed indeed for alloy Fe – 14.95% Ni. The kinetics of incomplete phase transformations is described within the concept that the reaction is stopped due to decrease in the thermodynamic stimulus of the transformation caused by accumulation of defects in the initial phase. An equation describing the C-curve of the transformation is obtained.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 7 – 14, September, 2014.
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Mirzaev, D.A., Okishev, K.Y. Formation of Packet (Lath) Martensite in Iron-Nickel Alloys. Met Sci Heat Treat 56, 462–469 (2015). https://doi.org/10.1007/s11041-015-9783-8
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DOI: https://doi.org/10.1007/s11041-015-9783-8