Influence of Ionic Bombardment on the Processes of Nitriding During Complex Modification of Steel Surface

Abstract

Ionic bombardment of the surfaces modified with the use of vacuum-arc technologies is a basic physical process for such modifications. Experiments were produced on plant of type "Bulat". In-process on nitriding of surfaces massive steel details (item of 25Х1МФ and 40Х) was investigated features of using of bombardment particles with different energy content. As bombarding particles ions of titan and molybdenum was use. This stage of ionic bombardment is related to cleaning of surface and heating of it to the necessary temperature. On the step of nitriding bombardment was carried out by the ions of nitrogen, generated in a two-stage discharge. For diagnostics of changes on the surface of standards and in the distance from it deep into metal, used X-ray fluorescence mass-analysis and produced measuring of hardness by means of device of Nanoindentor G200. The comparative measuring of relative concentrations of elements is executed in composition a surface became after bombardments different ions (Ti or Мо), and also the profiles of bedding of the implanted nitrogen and modified hardness in a metal are got. Features are educed in the results of nitriding of steel surface by the use of different sorts of ions. The photos of the transversal microsections got by means of optical metallography microscope of ММО 1600 showed differences in structural characteristics of the nearsurface layers by using the bombardments ions of titan and molybdenum. These differences are related to the high temperature in layers during bombardment the ions of molybdenum. The purpose of this work is conduction comparative experiments on the treatment of steel surfaces with accelerated ions of various metals with the subsequent analysis of the influence of such effects on the nitriding processes on these surfaces.