Abstract
The structural factor of samples microplasticity deposited with carbon steel construction tapes in connection with the different sensitivities of the deposited metal to stress concentration was investigated. The most favorable structure of the deposited layer, which is characterized by low sensitivity to stress concentration, is found. The combined technology of parts recovery modes operating in stress factor conditions is given. The covering agent composition, which allows to reduce the energy consumption during heat treatment of the deposited samples after treatment with high‐frequency currents, to increase the thermal insulation effect approaching to the furnace treatment conditions, was developed. It was established that retarded cooling in the covering agent of deposited samples after local heating with high‐frequency currents provides the increase in the average pressure ferrite during increase in the grain size. It was established that for parts operating under cyclic loading, the structure obtained as a result of combined treatment is the least sensitive to stress concentration.
Highlights
One of the main groups of worn parts, currently being repaired in large quantities, consists of various machine shafts and mechanisms with worn landing and supporting necks, prone to cyclic loads during operation
Having determined the optimal structure from the point of view of the surface layers’ physical state and sensitivity to stress concentration, one can correctly choose the technology for parts recovery. e regulation of the complex of physical and mechanical indicators
Advances in Materials Science and Engineering layers, microstructure, residual stresses, and their favorable distribution in the surface layer) is a significant reserve for ensuring the reliability of the recovered parts [5,6,7]. e presence of an inhomogeneous structure in the surface layer leads to a decrease in the wear resistance of parts operating under stress concentration [8, 9]
Summary
One of the main groups of worn parts, currently being repaired in large quantities, consists of various machine shafts and mechanisms with worn landing and supporting necks, prone to cyclic loads during operation. Having determined the optimal structure from the point of view of the surface layers’ physical state (deposited layer and heat-affected zone) and sensitivity to stress concentration, one can correctly choose the technology for parts recovery. E presence of an inhomogeneous structure in the surface layer leads to a decrease in the wear resistance of parts operating under stress concentration [8, 9] In this regard, it is advisable to conduct research aimed at identifying the microstructure with a low resistance of microplastic deformation and low sensitivity to stress concentration under cyclic loading conditions. To obtain the specified characteristics of the recovered parts, a stepwise transformation of the properties in a certain sequence with a gradual approximation of the properties to the specified ones [5] is necessary. e staging is conditioned by the fact that, on the one hand, it is impossible to convert all the dissimilar properties of a part with one method at the same time and, on the other hand, to obtain the whole complex of necessary values of the final parameters at one stage [8]. us, if electrocontact surfacing with steel tape is aimed at building up the surface layer with the transformation of geometrical parameters of parts and material structure, the subsequent heat treatment is aimed at improving the properties of the surface layer to ensure high stability under cyclic loading conditions. us, microplastic deformation plays a decisive role in the concentration of stresses in the deposited layer, and, affects the stability of the recovered parts operating under cyclic loading conditions. erefore, the study of the structure and development of the combined recovery technology was carried out regarding the resistance of microplastic deformation
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