Avtomaticheskaya Svarka (Automatic Welding), #8, 2019, pp. 16-21
Structure and properties of wear-resistant materials based on Co-Mo-Cr-Si-B system
A.M. Kostin, V.A. Martynenko
Admiral Makarov National University of Shipbuilding. 9 Heroev Ukrainy Ave., 54025, Mykolaiv, Ukraine.
The aim of the work was to study the structure and properties of the alloy of the Co-Mo-Cr-Si-B alloying system as-applied to its use as a wear-resistant material for hardening contact surfaces of working blades of ship gas turbine engines. The studies used the methods of high-temperature differential thermal analysis, electron microscopy, X-ray micro and X-ray structural analyzes, the hardness and microhardness of phase components were measured, the adhesion activity of experimental alloys was investigated using the sessile drop method. It is shown that experimental compositions have a balanced structure based on a solid solution of cobalt alloyed with molybdenum and chromium, with hardening by complex silicides, borides and carbides, possess acceptable mechanical properties, have a melting point below the temperature of irreversible softening of high-temperature nickel alloys and are characterized by high adhesive activity, which creates favorable prerequisites for their use in ship gas turbine construction. 10 Ref., 1 Tabl., 4 Fig.
Keywords: high-temperature nickel alloys, wear-resistant materials, structure, phase composition, hardness, melting point, adhesive activity
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