Abstract
Nimonic 80A-alloy belongs to Nickel-based superalloys. Many of them are used in variety branches of industry due to high strength and resistance in aggressive conditions. Moreover, its mechanical properties are kept in high temperature. However, these materials should be coated by appropriate wear protection, under conditions of considerable mechanical wear. Unfortunately, the production of thick borided layer in diffusion boriding required high temperature and long duration of this processes. Therefore, in this study instead conventional diffusion process laser boriding was applied in order to produce boride layer on Nimonic 80A-alloy substrate. Laser alloying is the high-tech process which allows to modify the chemical composition of the surface. Laser boriding was arranged as a single tracks, therefore it was possible to evaluate the influence of laser treatment parameters on thickness and hardness of produced layers. The laser beam power P, laser scanning speed vl and laser beam diameter dl were the variable parameters used during laser alloying.
Highlights
All of nickel alloys are known of their corrosion resistance and good strength properties, in very high temperatures
They are characterized by low hardness and wear resistance and their application is limited. They cannot be used for machine parts which cooperates with each other by sliding because it rapidly leads to damage of surface and sudden increase of roughness
Layer of properties different than boron and the substrate is obtained. These properties depend on laser treatment parameters which impact heating, melting, mixing and solidification processes
Summary
All of nickel alloys are known of their corrosion resistance and good strength properties, in very high temperatures They are characterized by low hardness and wear resistance and their application is limited. Methods of thermo-chemical treatment allow to increase the durability of parts which are subjected to the large surface pressure Effects of carburizing these alloys are unsatisfactory. Layer of properties different than boron and the substrate is obtained These properties depend on laser treatment parameters which impact heating, melting, mixing and solidification processes. It has an influence on structure, thickness, stresses and utility properties of layer.
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