Inconel 600 alloy is used extensively for a variety of industrial applications involving high temperature and aggressive environments. However, under conditions of appreciable mechanical wear (adhesive or abrasive), this material has to be characterized by suitable wear protection. The diffusion boronizing efficiently improved the tribological properties of this alloy. Nevertheless, the long duration of this process was necessary in order to obtain the layers of the thickness up to about 100 μm. In this study, instead of the diffusion process, the laser alloying with boron was used for producing a boride layer on Inconel 600 alloy. During this process, the external cylindrical surface of base material was coated by paste, including amorphous boron, and remelted by a laser beam. In the remelted zone, the three areas were observed: compact borides zone consisting of nickel and chromium borides (close to the surface), zone of increased percentage of Ni–Cr–Fe matrix (appearing in the greater distance from the surface) and zone of dominant percentage of Ni–Cr–Fe matrix (at the end of the layer). The hardness was comparable to that-obtained in case of diffusion boriding. Simultaneously, the laser-borided layer was significantly thicker. In order to evaluate the corrosion behaviour, the immersion corrosion test in a boiling solution of H2O, H2SO4 and Fe2(SO4)3 was used. As a consequence of selective laser alloying, the difference in electrochemical potentials between the layer and base material caused the accelerated corrosion of the substrate in areas without laser-borided layer. The results showed that laser-borided Inconel 600 alloy could be characterized by the excellent corrosion resistance in such corrosive solution if the whole surface would be covered with laser-alloyed layer
Słowa kluczowe: laser boriding, Inconel 600 alloy, microstructure, hardness, corrosion resistance.
Keywords: borowanie laserowe, Inconel 600, mikrostruktura, twardość, odporność na korozję.
1. INTRODUCTION Nickel and its alloys are important materials in industries, which require excellent corrosion resistant and heat resistance. Most of nickel alloys are characterized by higher resistant to corrosion than the stainless steels, especially in solutions containing reducing acids and in case of stress-corrosion cracking. The groups of nickel alloys resistant to corrosion can be categorized according to their major alloying elements: Ni-Cr, Ni-Cr-Mo, Ni-Cr-Fe, Ni-Cu and Ni-Mo . Inconel series alloys (nickel-chromium-iron) are a standard engineering materials for applications which require resistance to heat and corrosion. These materials are characterized by excellent mechanical properties including combination of high strength and good workability. The high concentration of nickel results in resistance to corrosion by many organic and inorganic compounds and also to chloride-ion stress-corrosion cracking. The role of chromium in the Inconel series alloys is to facilitate the passive film formation. Such a film provides protection in a wide range of oxidizing environments such as nitric (HNO3) and chromic (H2CrO4). A secondary role of chromium is to provide some strengthening of the solid solution [1, 2]. However, an essential drawback of Ni-based alloys is their susceptibility to local types of corrosion (including intergranular corrosion). The intergranular corrosion (IGC) of nickel alloys is caused by segregation of alloying elements at the grain boundaries (for example chromium carbides or nitrides). Upon exposure to a corrosive solution, the chemical and structural segregation at grain boundaries leads to electrochemical heterogeneity and to dissolving metal surface and the development of IGC . The secondary disadvantage of Ni-based alloys are their low resistance to abrasive or adhesive wear, which causes their limited application. The suitable surface treatment could increase the wear resistance of thes [...]
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