Metallographic studies of the microstructure of the experimental type of the deposited alloy of the Fe - C - Cr - Ni - Mn - Mo - Ti - Nb alloying system were performed. The chemical and granulometric composition of the metal-strengthening phases has been determined. The weld metal was tested for resistance to gas-abrasive wear at elevated temperatures. The wear resistance of the deposited metal was diagnosed by sclerometry with obtaining images of tracks from the indenter using atomic force microscopy. The character of microplastic deformation of worn surface layers of the alloy is investigated. The influence of the structural phase composition and hardening phases in the deposited metal on its wear resistance is discussed. Promising ways to further increase the resistance of the experimental alloy to gas-abrasive wear are determined.
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.
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