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METHODOLOGICAL ASPECTS OF THE APPLICATION OF ELECTRIC SPARK ALLOYING. PART 2: DEVELOPING RESEARCH METHODOLOGY, CRITERIA AND PERFORMANCE INDICATORS

There is no systematic information in the literature about the methodology for achieving the required functional properties of the executive surfaces of various objects: machine parts, tools and technological equipment for mechanical processing of materials in cold and hot conditions. (Research purpose) The research purpose is in developing a methodology for creating executive surfaces of parts for various purposes using electric spark alloying and justifying the criteria and parameters for evaluating this method. (Materials and methods) The authors created a methodological base by using the deductive method with gradual level specification and addition of the developed topics. The basis of the development was the four-link paradigm of G. V. Samsonov “composition-technology-structure-properties”, supplemented by a feature of the functional purpose of the material and extended features of the composition and technology. Authors used a hypothetical-deductive model for obtaining scientific knowledge to develop a methodology for creating executive surfaces of parts using the ESA method. (Results and discussion) The article shows the role of hardness, melting temperature, and elastic modulus of materials in the formation of electric spark coatings and their properties, identifies technological variants of the doped layer macrostructure, reveals the wettability of the anode material with the cathode material, the mutual solubility of the materials of the "anode-cathode-medium" system, and their chemical affinity. (Conclusions) The article presents the methodological schemes for the study and selection of the anode material, which largely determines the desired properties of the doped layer. Authors proposed a methodological approach to the development of criteria and indicators for the effectiveness of electric spark alloying, analysis and generalization of the main methodological provisions for strengthening and restoring the executive surfaces by this method, taking into account their functional purpose. The article considers a number of dominant factors that affect the efficiency of electrospark doping, as well as the selection and development of performance criteria in the field of surface materialology.