Conclusions
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1.
High temperature thermomechanical treatment of 55KhGR steel at 950–1100°C results in recrystallization of austenite which is determined by the temperature and the degree of deformation.
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2.
Deformation of 55KhGR steel at 850 and 900°C does not lead to recrystallization of austenite due to rolling regardless of the degree of swaging.
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3.
Deformation at 950°C is accompanied by recrystallization due to rolling when the degree of swaging is higher than the critical degree (>5–15%) and to collecting recrystallization when the degree of swaging is in the critical range.
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4.
Deformation at 1050–1100°C results in collecting recrystallization of austenite regardless of the degree of swaging.
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5.
The cooling rate in water or in oil used in high temperature thermomechanical treatment has no effect on the grain size of the austenite.
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6.
The maximum ultimate strength results from recrystallization due to rolling. Collecting recrystallization resulting from high temperature thermomechanical treatment considerably decreases the ultimate strength of 55KhGR steel.
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Additional information
Scientific Research Institute of the Automobile Industry Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 44–46, February, 1965
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Bron, D.I., Levites, I.I. & Shashina, M.N. Recrystallization of 55KhGR steel during high temperature thermomechanical treatment. Met Sci Heat Treat 7, 114–116 (1965). https://doi.org/10.1007/BF00655817
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DOI: https://doi.org/10.1007/BF00655817