Conclusions
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1.
The newly devised method of thermal cycling including heating at the rate of 5 deg/min to Tu.Zm (5–10°C higher than Acs) with subsequent slow cooling to 5–10°C below Ar1 makes it possible within three to five cycles to refine the austenite grain of steel 20Kh to No. 11; this increases impact toughness after final cooling in air to a value 1.5–2.5 times as high as after normalization and thermal cycling with accelerated heating.
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2.
In the fine austenitic grain, obtained in thermal cycling with slow heating and cooling, phase strain-hardening does not occur, and in consequence, after final cooling in water or oil from the upper limit of the cycle, the impact toughness of steel 20Kh increases more than 3 times while strength and ductility are high compared with thermal cycling with accelerated heating in which the phase strain-hardening of the austenite is retained.
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Literature cited
Heat Treatment in Engineering (Handbook) [in Russian], Mashinostroenie, Moscow (1980).
V. K. Fedyukin, Method of Thermal Cycling of Metals [in Russian], Leningrad State Univ. (1984).
L. P. Frantsuzova, A. V. Vladimirov, T. N. Chetchasova, et al., "Increasing the impact toughness of structural steels by thermal cycling," Metalloved. Term. Obrab. Met., No. 4, 15–17 (1984).
Additional information
Moscow Higher Institute of Metallurgy (MVMI), All-Union Research Institute of Engineering (VNIITMASh). Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 28–30, August, 1985.
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Bashnin, Y.A., Lisitskaya, L.A., Semenova, L.M. et al. Effect of thermal cycling on the mechanical properties of steel 20Kh. Met Sci Heat Treat 27, 589–591 (1985). https://doi.org/10.1007/BF00699357
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DOI: https://doi.org/10.1007/BF00699357