Conclusions
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1.
Heating of steel R6M5 in the manufacturing process leads to transformation of eutectic carbides and also division, spheroidization, and coalescence of carbide particles. The carbide in the lamellar eutectic is transformed to M6C and VC; VC is also formed in hexagonal and skeleton eutectics.
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2.
In steel R6M5, unlike steel R18 [1], the carbide transformation occurs at relatively low temperatures and short heating times.
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3.
In steel R6M5 modified with nitrogen and zirconium the rate of the carbide transformation increases, while the rate of the change in the shape of the carbide particles decreases. The difference in the structure of steel R6M5 modified with zirconium or nitrogen and the standard heat after heating under identical conditions indicates the necessity of correcting the heating conditions for ingots of modified steel R6M5 before rolling.
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Literature cited
Yu. N. Taran, P. F. Nizhnikovskaya, and É. N. Pogrebnoi, “The nature of angular carbides in high-speed steel,” Metalloved. Term. Obrab. Met., No. 2, 10 (1974).
R. Barkalov, R. Kraft, and J. Goldstein, Met. Trans.., 3, 919 (1972).
K. P. Bunin, Ya. N. Malinochka, and Yu. N. Taran, Fundamentals of the Metallography of Cast Iron [in Russian], Metallurgiya, Moscow (1969).
L. Ya. Popilov and L. P. Zaitseva, Electropolishing and Electroetching of Metallographic Specimens [in Russian], Metallurgiya, Moscow (1955), p. 115.
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 37–40, November, 1976.
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Taran, Y.N., Nizhnikovskaya, P.F., Grishina, O.N. et al. Carbide transformation in cast steel R6M5 during high-temperature treatment. Met Sci Heat Treat 18, 964–967 (1976). https://doi.org/10.1007/BF00706906
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DOI: https://doi.org/10.1007/BF00706906