Improving the Characteristics of Wear-Resistant Coatings Obtained by HDTV-Boration, their Modification by Intermetallic Compounds of Fe-Al and Ni-Al Systems

Abstract

Innovative technology of HDTV-borating, that is distinguished by high hardness, strength, wear resistance and corrosion resistance occupies a special place among the hardening processes for steels and construction materials. During the new technology process HDTV-boration of structural steel 65Mn (65Г in Russian) under a mix layer of charge mixture based on fused borate fluxing agent P-0.66, boron carbide and intermetallic compounds FexAly, NixAly. Using the methods of X-ray phase analysis, spectrography and metallography, the composition and structure of coatings were determined, the microhardness distribution over the coating thickness was studied. In the coatings, new phases of intermetallic compounds, the double superhard boride Fe2AlB2, were found; in the coatings, the base iron boride is FeB, what leads to an increase in their hardness and wear resistance. Modification of boride coatings formed by intermetallic compounds with melting temperatures close to the process temperature of HFC surfacing leads to a decrease in the cracks number and the appearance of new consumer qualities of the material.

The Structure and Properties of Hardening Coatings of Low-Chromium Hard Alloys for Agricultural Machine Parts

“…In this case, the material is formed directly on the surface of a part (in-situ), as a result of controlled physical and chemical processes [16]. For example, such new materials are represented by the boride coatings developed by the authors and obtained by HFC-heating of steel parts in special boronizing mixtures based on B4C and P-0.66 flux [17].…”

“…The base of these materials is a Fe-B-FeBn eutectic, which can contain inclusions of various strengthening phases: borides of steel alloying metals (Cr, W, V, etc. ), or substances complying the technological requirements of induction surfacing, for example, intermetallics of Fe-Al and Ni-Al systems [17].…”