Abstract
The article presents the results of research on the ion nitriding process of the so-called difficult to nitride 316L austenitic steel. The main aim of these studies was to determine what influences the intensification of the nitriding process as a result of using an active screen. Two variants of placing the nitrided elements in the glow discharge chamber were adopted: directly on the cathode and on the cathode using an active screen. After the nitriding processes were carried out, the influence of the adopted process parameters on the depth of nitrogen diffusion into the nitrided substrate was analyzed. In the further part of the work, an ionizing nitriding mechanism with the active screen method was proposed, explaining the significant increase in the effectiveness of the nitriding process using the active screen.
Highlights
The dynamic development of modern science and technology makes it necessary to use materials with increasingly favorable mechanical properties, in particular fatigue strength, corrosion resistance, and wear in conditions of friction
This paper presents the results of investigations of the ionic nitriding process of 316L austenitic steel
For the tested austenitic steel, the following was determined: In the first case, the surface of the samples is bombarded with ions with energies resulting from the value of cathodic drop, whereas in the second case, in the surface layer of the ion-nitrided surface of the sample, strong voltage peaks appear that react with the nitrogen ions found in this area
Summary
The dynamic development of modern science and technology makes it necessary to use materials with increasingly favorable mechanical properties, in particular fatigue strength, corrosion resistance, and wear in conditions of friction. These basic features depend on the properties of the appropriately constituted surface layer of these elements. Nitriding as one of the types of thermo-chemical treatment currently belongs to the group of the fastest developing methods of surface engineering This process makes it possible to improve the mechanical and functional properties of structural elements and machine parts, above all their hardness and strength and resistance to wear in conditions of friction as well as corrosion resistance. The current stream of scientific and utilitarian research concerns phase changes in iron nitrides occurring during the nitriding process of both solid and powdered metallic materials [4,5,6]
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