ANALYSIS OF THE STRUCTURE AND PROPERTIES OF THE INTERFACE "PLASMA COATING OF HIGH-SPEED STEEL - SUBSTRATE"

10.25712/ASTU.1811-1416.2026.01.002

Abstract

One of the important problems of practical use of high-strength plasma coatings of high-speed steels in a nitrogen environment is the analysis of the damping properties and adhesion of the coating and the substrate, since it is these properties that largely determine the premature formation of brittle microcracks in the contact zone. Molybdenum and tungsten-molybdenum steel coatings have recently found wide application instead of the well-known tungsten (P18, P9) and tungsten-molybdenum steels with increased tungsten content (P6M5, P6F2K8M6 and others). This is due to the need to replace expensive and scarce tungsten with molybdenum, which has a similar effect on the structure and properties of high-speed steels. The studies of the structural-phase states, morphology, properties and elemental composition of the transition zone of contact of the systems of deposited high-speed steel grades M9 and P2M9 - substrate (steel grade 30KhGSA) in the initial state were carried out. For the system “coating (high-speed steel P2M9) – substrate (steel 30KhGSA)” in the initial state, the transition zone has a martensitic structure with layers of residual austenite along the boundaries of the martensite plates. Particles of the second phase in the nanoscale (2–60 nm) range were identified: vanadium, molybdenum, tungsten and iron carbides localized at dislocations, at the boundaries and in the volume of martensite plates. For the system “coating (high-speed steel M9) – substrate (steel 30KhGSA)”, it was established that the formation of the coating is accompanied by the creation of an extended transition layer, which contains the α-phase, γ-phase, and carbides of complex composition.