Conclusions
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1.
After HTTMT of high-speed steel R18 by the optimum method the bending strength is 440 kg/mm2; after the standard treatment is 250 kg/mm2.
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2.
Reduction of the deformation temperature leads to impoverishment of the solid solution in carbon and alloying elements, promotes the precipitation and coalescence of carbides, and sharply reduces the red hardness.
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3.
HTTMT with 25% strain at 1100°C without previous austenitizing at 1275°C increases the bending strength 40%; the deflection remains unchanged by comparison with the standard treatment.
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4.
HTTMT does not increase the red hardness of R18 steel.
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Literature cited
M. M. Snitkovskii et al., Metalloved. i Term. Obrabotka Metal, No. 9 (1963).
Additional information
Permskii Polytechnical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 63–64, July, 1967.
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Tomsinskii, V.S., Nekrasov, V.A., Malygin, V.A. et al. Thermomechanical treatment of R18 steel. Met Sci Heat Treat 9, 545–546 (1968). https://doi.org/10.1007/BF00654260
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DOI: https://doi.org/10.1007/BF00654260