Influence of electrospark alloying on the heat resistance of steels

Conclusions The high-temperature oxidation of electrospark coatings on R9K5, 5KhNV, and 50 steels obtained by electrospark alloying with standard (T15K6, VK8, VK6M) and carbide-, nitride-, and boride-base tungsten-free alloys was investigated by the differential thermal analysis method. It was shown that in increase in heat resistance the refractory compound-base electrode materials used for production of coatings are in the order (by base component) boride-carbidenitride. A significant factor increasing the high-temperature oxidation resistance of the coatings is the increase in their coverage. With a high coating coverage on carbon steel its high-temperature oxidation resistance approaches that of die steel. Therefore, in a number of cases, replacement of expensive alloy steels with carbon steels is possible.Translated from Poroshkovaya Metallurgiya, No. 3(303), pp. 69–74, March, 1988.