Abstract
The purpose of this research was to analyze the change in residual stresses in the surface layer of steel samples taking into account the technological heredity effect on the value and sign of residual stresses. An installation of combined processing was developed. Combined processing consists of sequentially performing electromechanical processing and diamond smoothing. All areas of the samples were studied—after machining (i.e., in the initial state), after electromechanical processing, and after diamond smoothing. The research shows that the sign and value of residual stresses are significantly affected by the combined processing modes. The main parameters of the surface layer are formed at the final stage of the combined processing–diamond smoothing. This paper gives recommendations on the use of combined processing for power plant parts.
Highlights
Residual stresses determine the quality and operational characteristics of hydropower plants [1,2,3,4,5,6,7,8]
According to the results obtained, there is an additional phase of iron oxide along with the main phase α-iron only in the areas subjected to electromechanical processing
It can be assumed that diamond smoothing significantly increases the value of residual stresses in the surface layers due to an increase in the dislocation density
Summary
Residual stresses determine the quality and operational characteristics of hydropower plants [1,2,3,4,5,6,7,8]. The level of residual stresses is in many cases an important parameter that determines the quality of these mechanisms. Residual stresses can play both a positive and a negative role in changing the wear resistance of products, thereby determining their performance during operation. Significant residual stresses can occur after machining—lathe turning, milling, grinding—which act only in the surface layer with a depth of a few tenths of a millimeter. In the surface layer of the metal there are always various defects that serve as crack nuclei; the reliability of the parts is determined mainly by the intensity of the work of crack origins
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