Bilyk O. The development of scientific and technological fundamentals of surfacing wear-resistant alloys powder tape

The purpose of the work is to development of scientifically grounded technology for the production of powder tape electrodes and technology improvements of mechanized electric surfacing of wear-resistant alloys using powde tape. The object of study is the regularity of formation of wear-resistant weld metal when using powder tape electrode material. The subject of study is the construction of powder band electrode materials, methods of surfacing and the influence of the external magnetic field on the formation of weld metal with the necessary dimensions and properties. Research methods-optical and scanning electron microscopy, energy dispersive spectroscopy, x-ray diffraction analysis, microhardness measurements; abrasive wear tests; mathematical modeling of calculation of design parameters of powder tape electrode materials, computational and experimental studies, mathematical methods of data processing using software, mathematical packages Excel, MathCad, Ansys-ED, based on numerical solutions. The mathematical models were based on the finite element method, elements of the theory of thermal processes, regression analysis. The regularity of formation of wear-resistant weld metal when using powder tape electrode material. The regularity of formation of the structure of the weld metal with the alloying system Fe-C-Cr-Ni obtained by mechanized electric arc surfacing with powder tape. First shown that at multilayer surfacing of wear-resistant alloy powder tape PL-AN-111, in the overlapping zones, graphite is released during the conversion of carbides in the recrystallization process. A methodology for evaluating the mixing quality of powdered components of different granulation and technological properties has been developed, which characterizes the mixing efficiency in the production of powder tapes. It is experimentally confirmed that the imposition of an external magnetic field with an induction of 28 mT on the melting zone of the powder tape leads to a modification of the primary structure of the deposited layer, an increase in the microhardness of the carbide eutectic by 20-50HV. Implementation of recovery and strengthening technologies mechanized surfacing powder ribbons allowed to increase: the operational stability of the wires of the condition spsh-120 PJSC "Azovstal iron and steel works" an average of 3.03 time and ensured increased productivity of equipment; the stability of the rollers of the roller convey or rolling mill 3000 of PJSC "Mariupol Ilyich" in average of 1.87 times, which made it possible the overhaul period of their work; productivity and quality welding powder tape with of parts of the charging equipment of blast furnace (cones and bowls) 20% in terms of PJSC "Azovobschemash". The total economic effect of the implementation of the developed recovery technologies is 2 961 740 UAH.