NITRIDING OF LONG-DIMENSION HOLES IN CYCLIC-SWITCHED DISCHARGE

Abstract

The paper presents the results of the study of the surface microhardness and wear resistance of steel 45 nitrided in a hydrogen-free environment in a glow discharge with the gas discharge chamber powered by a cyclically switched discharge. The experiments were carried out on a model that is a hollow cylinder with holes drilled at a certain distance from the ends, into which samples of steel 45 were inserted with a certain tension. Thus, the ends of the samples outside and inside the cylinder were nitrided under practically the same technological conditions. Two options for nitriding the inner surfaces of the holes in a cyclically switched discharge were considered: a through hole (the ends of the cylinder are open) and a blind hole (one end of the cylinder is closed with a lid). For comparison, the results of strengthening the inner surfaces of the holes by nitriding with a constant current supply to the gas discharge chamber are given. The results obtained show the efficiency of nitriding of long-length through.