Abstract
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. 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. 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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