Development and study of FeWMoCrBC metallic glass coatings synthesized by electrospark deposition

A.A. Burkov1, S.A. Pyachin1, A.V. Zaytsev1, E.A. Kirichenko1, M.A. Teslina1, N.A. Syuy1
1Institute of Materials of Far Eastern Branch of the Russian Academy of Sciences, 153 Tikhookeanskaya Street, Khabarovsk 680042, Russia

Abstract

The paper is devoted to studying the possibility of creating an amorphous state in the metallic materials in the electrospark action process. Produced by powder metallurgy FeWMoCrBC crystalline alloys of two different compositions that were used as anodes for the coating onto the steel 1035 substrate by electrospark deposition technology. Study of mass transfer kinetics during the deposition of both compositions showed relatively high values of gain cathodes. Thus, the maximum mass transfer efficiency achieved using an electrode with a high iron content due to better adhesion to the steel substrate. It is found that by coating had a thickness of about 40 microns and had the metallic glasses structure from XRD data. Based on the results of differential scanning calorimetry revealed that recrystallization of the coating material occurred at annealing temperature exceeding 814-825 oC. XRD data of the samples after annealing at 1200 oC showed that the amorphous structure is crystallized into carbides iron, tungsten and boron; borides iron, molybdenum and tungsten; as well as is observed metallic chromium and tungsten. The surface roughness of coatings was 7 microns. Were conducted tests on the durability of FeWMoCrBC metallic glass coatings to microabrasive wear, and dry sliding abrasion with a silicon carbide abrasive disk. It is shown that the FeWMoCrBC amorphous electrospark coatings improve wear resistance and microhardness of the steel 1035 in 2-4 times, respectively. In general, despite the significant differences in the composition of the electrode materials obtained from the coating of metallic glasses had very similar properties.

Received: 13 March 2016   Revised: 24 July 2016   Accepted: 25 July 2016

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