DOI: 10.18503/1995-2732-2026-24-1-75-87
Abstract
Problem Statement (Relevance). The problem of increasing the wear resistance and fatigue strength of parts made of GCr15 bearing steel is relevant. The increased operational requirements are no longer achieved by traditional methods of hardening machine parts. In turn, this can be achieved through the use of combined surface hardening methods such as laser hardening followed by ultrasonic hardening treatment. However, at the moment there is a problem related to the optimization of the technological process of ultrasonic hardening of parts such as rotational bodies previously subjected to laser hardening and grinding of the defective layer. Objectives. The study is aimed at ascertaining the optimal values of the technological parameters of the ultrasonic hardening treatment of parts such as rotational bodies made of bearing steel GCr15. These parts were previously subjected to laser hardening and grinding of the defective fused layer in order to achieve the required surface roughness, maximum values of residual compressive stresses and microhardness on the surface. Methods Applied. The basis of the experimental part is a second order rotatable central composite plan. The measurements include the analysis of roughness, residual stresses, and microhardness on the surface of the samples. Originality. Regression equations have been developed to determine the optimal values of the technological parameters of the ultrasonic hardening treatment of rotational bodies made of GCr15 bearing steel previously subjected to laser hardening and grinding of the defective layer. Result. The obtained equations make it possible to determine with an accuracy of at least 95% the values of the parameters of the ultrasonic hardening treatment mode to ensure the required quality values of the surface layer of the parts, to ensure high process productivity. Practical Relevance. Regression equations can be used to forecast the effect of the technological parameters of the ultrasonic hardening treatment mode on roughness, residual stress, and microhardness on the surface, as well as to find optimal values for the parameters of the ultrasonic hardening mode of GCr15 ball-bearing steel.
Keywords
ultrasonic hardening treatment, bearing steel, rotatable central composite plan, roughness, microhardness, residual stress
The authors are grateful for the opportunity to conduct the experimental part of the study and the financial support provided within the framework of the Yongjiang talent project, grant no. CIE23AM0105, CIE23AM0106.
For citation
Petrochenko S.V., Fedorov A.A., Makashin D.S., Mikhailenko S.V. Search for Optimal Values of Technological Parameters of the Ultrasonic Hardening Treatment Mode for Rotational Bodies Made of Bearing Steel GCr15 Previously Subjected to Laser Hardening and Grinding. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2026, vol. 24, no. 1, pp. 75-87. https://doi.org/10.18503/1995-2732-2026-24-1-75-87
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