Abstract
In this work 'Mo-Fe-C' coatings fabricated on medium carbon steel by non-vacuum electron beam cladding were investigated. The structure of coatings and transition zones were studied by scanning electron microscopy (SEM). It was shown that an increase of Fe percentage in the cladding mixture led to a decrease of the eutectic volume fraction in the coating and was accompanied by the formation of the gradient structure between the coating and a substrate material. Measurements of microhardness in the cross section of samples revealed that the cladding of a 'Mo-C powder mixture contributed to a 4.5-fold increase of microhardness.
Highlights
One of the main tasks of mechanical engineering is enhancing wear-resistance of the parts functioning in abrasive wear conditions
The aim of the present paper is to study structural-phase transformations, occurring at formation of molybdenum-containing coatings realised by the method of non-vacuum electron-beam cladding
Additional introduction of the iron into the cladding mixture has reduced the concentration of the alloying elements in the alloyed layers
Summary
One of the main tasks of mechanical engineering is enhancing wear-resistance of the parts functioning in abrasive wear conditions. The surface layers of parts contacting an abrasive material are subjected to wear. A rational solution of the tasks is hardening of the product surface. When cladding wear-resistant coatings, the alloys of a carbide family or carbide-based powders are used. The coatings obtained by cladding with expensive tungsten carbide, (wolfram carbide) WC [1,2,3,4], have the highest resistance indices at abrasive wear. The use of refractory carbides, such as TiC, CrC, TaC, VC, MoC, NbC, as surfacing materials seems a more rational solution [5,6,7,8,9,10,11,12]
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