Conclusions
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1.
The data presented confirm the fact that the formation of "combination structures," consisting of bainite and troostite, is the result of decomposition of austenite in a relatively narrow temperature range where the pearlitic and bainitic ranges overlap.
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2.
The data obtained on the mechanism by which combination structures consisting of high-carbon troostite and low-carbon bainite are formed lead us to assume that the redistribution of carbon occurs only in the beginning of the isothermal transformation in regions commensurate in size with fragments of grains.
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Literature cited
A. Tananko and L. P. Ivanova, Fiz. Metal. Metalloved., 23, No. 2 (1967).
N. Tovadze (editor), Metallography of Iron [in Russian], Vol. 2, Metallurgiya, Moscow (1972).
Additional information
V. I. Lenin Khar'kov Polytechnical Institute. Translated from Metallovedenie i Termicheskaya Obtabotka Metallov, No. 2, pp. 8–10, February, 1976.
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Guiva, R.T., Pivovarov, V.M., Tananko, I.A. et al. Decomposition of austenite in structural steels at 500–450°C. Met Sci Heat Treat 18, 111–113 (1976). https://doi.org/10.1007/BF00664142
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DOI: https://doi.org/10.1007/BF00664142