STUDY OF STRUCTURE FORMATION OF COMPOSITE WEAR-RESISTANT LAYER DURING ELECTRIC CONTACT SURFACING WITH POWDER TAPES

Abstract

A promising direction for restoring worn and strengthening new parts is the formation of a surface layer with the necessary operational properties. One of the most common technological processes is arc surfacing, but it has a number of disadvantages, which include a significant change in the initial phase state of the coating material and a significant thermal effect on the part material. Coating application technologies based on short-term thermal action allow preventing the formation of a thermally affected zone of significant size. Such processes include the electrocontact method, which is characterized by the joint plastic deformation of the contact volume of the surface and the filler material with the formation of a connection of the coating with the base metal. Given the short duration of the electrocontact surfacing process, there are certain difficulties in predicting the resulting coating quality and compliance with its main operational properties. Therefore, there is a need to improve the technology of restoring worn surfaces by the electrocontact method by studying the formation of the structure of the deposited layer and developing methods for ensuring the programmed distribution of structural components along its cross section, as well as by improving the technology for manufacturing additive materials with a gradient distribution of properties.In the presented work, a study was conducted of the influence of the carbon content in the charge material of the core of the powder ribbon on the process of structure formation of the deposited layer, taking into account the technological parameters of the electrocontact deposition process and subsequent electrothermal treatment.