Authors: N.V. Ababkov, M.V. Pimonov, M.S. Nikitenko, E.E. Levashova

Title of the article: Influence of mechanical processing mode on the microstructure and mechanical characteristics of the surface layer of structural steel samples after surfacing

Year: 2025, Issue: 3, Pages: 50-58

Branch of knowledge: 2.5.6. Engineering technology

Index UDK: 621.791.05:620.179

DOI: 10.26730/1999-4125-2025-3-50-58

Abstract: Currently, a significant share of equipment in the mineral resource and fuel and energy complexes has exhausted its service life. For this reason, the development and study of methods for extending the service life of parts and metal structures using strengthening technologies and optimal mechanical processing modes to obtain the desired geometry. The paper presents original results of studies of samples after surfacing of the surface layer and its mechanical processing by cutting in various modes. The main parameters of the surface layer were analyzed, in particular, the hardness measured by the Vickers method, the microstructure of the deposited metal, and using non-destructive methods spectral-acoustic, acoustic characteristics were obtained. It is shown that the processing modes affect the microstructure of the surface layer. An increase in the grain size in the deposited metal leads to a decrease in the mechanical characteristics such as hardness and yield strength, which is caused by an increase in the thickness of the cut-off surface layer. The results of non-destructive testing are obtained and presented in the form of graphs of the dependence of the delay time of Rayleigh surface acoustic waves and average hardness values ​​on the thickness of the cut-off layer of the deposited metal, as well as a graph of the dependence of the yield strength values ​​on the delay time of the acoustic signal. The obtained results of experimental studies can be used to assess the quality of the surface layer of machine parts after renovation operations, including restoration and mechanical processing. In this case, the assessment of the microstructure, the presence or absence of surface defects, will be carried out without cutting out samples using the spectral-acoustic method of non-destructive testing.

Key words: restoration by surfacing cutting modes structural steel yield strength hardness average grain size spectral-acoustic method

Receiving date: 10.03.2025

Approval date: 10.06.2025

Publication date: 26.06.2025

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