Babinets A. Technologies and materials for surfacing of details with high thermomechanical fatigue resistance

This paper deals with the development of technology and the improvement of materials for multilayer surfacing of details, which are operated under conditions of wear and cyclic thermomechanical loads, based on calculations and experimental methods for evaluation fatigue life and operational life of these details. First proposed the scientific basis for the development of the technology of multiple recovery details with multilayer surfacing as well as the choice of materials for surfacing and determine the quantity of this allowable repairs. This basis is the developed methodology for evaluation fatigue life, which is established in the framework of a unified mathematical model based on the theory of growing bodies, modern model of nonisothermal viscoplastic flow and diagrams thermokinetic decomposition of austenite deposited and base metals. Found that in case of operating load values, the estimated amount of allowable repairs with the removal and subsequent resurfacing of the wear layer is five. The techniques and designs of the deposited samples are developed for an experimental evaluation of their fatigue life under cyclic thermal and mechanical loads, which fully confirmed the accuracy of the developed mathematical models. It was established that the surfacing of plastic sublayer increases the fatigue life of details in 1,2...1,3 times. The results obtained in this work also confirmed during the industrial verification. Keywords: surfacing, surfacing technology, surfacing materials, fatigue life, thermal fatigue, mechanical fatigue, fatigue testing methods, allowable number of repairs.