Conclusions
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1.
The heating rates generally used for surface induction hardening have no effect on the maximum hardness. However, the difference between the maximum and minimum microhardness increases with the heating rate.
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2.
In both bulk and surface isothermal hardening the hardness and microhardness decrease continuously with increasing temperatures of the cooling medium. At 350–400° the hardness decreases at a decreasing rate.
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3.
The hardness is higher after surface isothermal hardening than after bulk isothermal hardening at all isothermal holding temperatures generally used.
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Literature cited
M. M. Klimochkin, Strength Properties of Surface Hardened Cast Iron with Spheroidal Graphite [in Russian], Mashgiz, Moscow (1957).
Additional information
I. I. Polzunov Altai Polytechnical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 64–66, July, 1975.
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Sviridenko, K.A. Effect of heat treatment on hardness of high-strength cast iron with spheroidal graphite. Met Sci Heat Treat 17, 617–619 (1975). https://doi.org/10.1007/BF00680417
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DOI: https://doi.org/10.1007/BF00680417