INCREASING THE RESOURCE OF WORKING PARTS OF MACHINES OPERATED IN AN ABRASIVE ENVIRONMENT BY THE METHOD OF CARBOVIBROARC HARDENING

Abstract

The problem of increasing the resource of working parts of machines operated in an abrasive environment is still relevant. A promising way to strengthen the working parts operated under these conditions is carbovibroarc hardening. Currently, the issues of using iron-based matrix powders as part of multicomponent pastes for carbovibroarc hardening remain insufficiently considered, although they have a number of advantages over other powders. (Research purpose) The research purpose is substantiating the expediency of using an iron-based matrix powder as part of a multicomponent paste for carbovibroarc hardening in order to increase the life of the working parts of machines operated in an abrasive environment. (Materials and methods) Powders PR-KH30SRNDYU on an iron basis and PR-NH17SR4 on a nickel basis were used in the research as matrix material of multicomponent pastes, boron carbides B4C and silicon SiC were used as ceramic components of pastes. carbovibroarc hardening was carried out using the VDGU-2 installation in the following modes: current strength - 70 amperes, vibration frequency of the carbon electrode - 25 hertz. (Results and discussion) It has been shown as a result of scientific research that metal-ceramic coatings obtained on pastes containing matrix powder PR-X30SRNDU 65 percent by weight, boron carbide as a ceramic component 25 percent by weight and cryolite - the rest have the highest microhardness. The microstructure of the obtained coatings is dense and practically nonporous, and their wear is 2.7 times less than the wear of steel 65G, adopted as the reference standard. (Conclusions) The data obtained confirm the feasibility of using iron-based matrix powders as part of multicomponent pastes for carbovibroarc hardening. Their use will significantly increase the resource of working parts of machines operated in an abrasive environment.