ANALYSIS OF CLADDING ALLOYS FOR GAS-ABRASIVE WEAR CONDITIONS AT ELEVATED TEMPERATURES
The analysis of the main industrial and experimental types of wear-resistant surfacing alloys is carried out. The influence of the structural-phase composition and hardening phases in the deposited metal on its wear resistance is discussed. It is shown that the optimal ratio of the volume fractions of the plastic matrix and hard phases in the structure of the deposited alloys, which provides high resistance to gas-abrasive wear, largely depends on the angles of attack. The formation of hardening phases in the form of large inclusions of chromium carbides, as well as small high-hardness carbides of niobium, molybdenum and vanadium contributes to an increase in the wear resistance of alloys in a wide range of angles of attack. High ductility and resistance to oxidation of the matrix metal is provided when it is formed on the basis of γ-Fe due to alloying of the alloy with nickel. Alloying the weld metal with large amounts of carbon and boron is not desirable, since it greatly increases the brittleness of the metal, deteriorating its technological properties.