RESTORATION AND STRENGTHENING OF PARTS SUBJECTED TO ABRASIVE WEAR epub

The monograph “RESTORATION AND STRENGTHENING OF PARTS SUBJECTED TO ABRASIVE WEAR” is devoted to an urgent engineering problem of the modern agro-industrial sector: increasing the durability of machine parts operating under severe conditions of intensive abrasive wear. During operation, the working tools of tillage machinery, cultivator sweeps, ploughshares, knives, cutting elements, and other parts of agricultural units are in constant interaction with the soil environment, which contains hard mineral particles, sand, stony inclusions, and other abrasive components. Under such conditions, the surface layers of metal are rapidly destroyed, the geometry of parts changes, the quality of technological operations deteriorates, energy consumption increases, and the number of failures and machine downtimes grows.
The publication provides a comprehensive analysis of the scientific, technological, and practical foundations of restoration and strengthening of worn parts of agricultural machinery. Electroslag surfacing occupies a central place as an effective method for forming wear-resistant surface layers with specified operational properties. It is shown that this technology makes it possible not only to restore the original dimensions of a worn part, but also to create a new functional layer on its surface, capable of resisting abrasive destruction for a longer period.
Particular attention is paid to the use of flux-cored wires with modifying additives. Their application makes it possible to purposefully influence the chemical composition of the deposited metal, crystallization processes, the formation of strengthening phases, structural homogeneity, and the physical and mechanical properties of coatings. The monograph considers the possibilities of carbide, boride, and carboboride strengthening, as well as the prospects for using silicon carbide and secondary raw materials as effective modifying components.
The first chapter analyzes the problems of wear resistance and resource saving in the agro-industrial sector. It examines the specific features of wear of cutting elements of tillage machinery, modern methods for strengthening and restoring parts, the advantages of applying coatings, and the technological capabilities of electroslag surfacing. Materials, modifiers, and modern electrode materials used to obtain abrasion-resistant deposited metal are considered separately.
The second chapter is devoted to research methodology and methods. It presents the characteristics of technological equipment, materials for manufacturing flux-cored wires, methods of electroslag surfacing in a current-supplying mold, as well as methods of metallographic, X-ray spectral, and optical-mathematical analysis of deposited coatings.
The third chapter investigates the structure, phase composition, and physical and mechanical properties of deposited coatings. The regularities of structure formation in the deposited metal are established, the influence of electroslag surfacing modes on structural stability is evaluated, and the role of modifying additives in increasing the wear resistance of coatings is determined.
The fourth chapter presents the results of field tests of the working tools of agricultural machinery. It considers the technology for restoring cultivator sweeps and ploughshares using electroslag surfacing, as well as methods for measuring wear and analyzing the condition of the surfaces.
The monograph has a clearly scientific and practical orientation and will be useful for researchers, engineers, repair-production technologists, specialists in materials science, welding and surfacing production, specialists of the agro-industrial sector, lecturers, postgraduate students, and students of technical specialties.