Investigation of alloys obtained by arc surfacing with flux-cored wire

The paper considers the problem of obtaining a stable structure in arc surfacing with flux-cored wire, where the presence of pores, inhomogeneities, and structural defects leads to a reduction in the service life of surfaced components. For the study, a flux-cored wire containing 35V9Kh3SF charge and a carbon-fluorine additive was used, followed by investigation of the properties of the resulting coatings formed on a steel substrate. Three wire samples were fabricated with component ratios of 95/5, 97/3, and 99/1; surfacing was performed in four layers under a silicomanganese flux on an ASAW-1250 welding tractor. To evaluate the structure and properties of the coatings, the authors carried out elect­ron microscopy, EDS analysis, nonmetallic inclusion analysis, and nanohardness measurements. It was established that the composition and morphology of the surfaced layer depend on the charge-to-additive ratio. Sample 1 exhibits martensitic structure and relatively stable nanohardness values; sample 2 is distinguished by the most favorable chemical homogeneity and increased Young’s modulus; sample 3 demonstrates the smallest scatter of nanohardness and Young’s modulus across sections. The obtained results confirm the potential of using flux-cored wires with carbon-fluorine-containing additives for the development of surfacing materials with specified properties.