Microstructural Analysis of Multiple Layer Depositions on Cast Iron Using the Electrospark Deposition Method

Abstract

The present article is focused on the obtaining of a thin layer system on Fe-C alloys by deposition of 3 successive layers with several electrodes. These layers offer to the material a broad range of enhanced properties as: mechanical resistance, surface hardness, compression behavior and a martensitic structure of the carbides, which reduce the effect of the wear, having positive results on the life-cycle of the product. The principle of the hardening consists in an electrical discharge by spark on which the action of the rectified current impulse transfers material from the electrode, considered cathode to the surface of the material which is the anode. This material reacts chemically with the nitrogen, from the atmosphere, with carbon and with support material, forming a diffusion layer, resistant to wear.