RESEARCH OF RESIDUAL STRESSES IN THE SURFACE LAYER OF PARTS FROM STEEL 13Х15Н4АМ3 AT LONGITUDINAL TURNING

The PURPOSE of the paper is to perform a comparative analysis of the measurement results of residual stresses in steel 13Х15Н4АМ3 (VNS-5) after longitudinal turning with a varied feed. The work has the following objectives: to determine the influence of processing modes at longitudinal turning on technological residual stresses formed in a sample and to compare the methods different in principle for the study of the stress-strain state of material on the part surface. METHODS. The study uses a mechanical method for determining residual stresses and an X-ray diffraction analysis (XRD). Being the most widespread in the analysis of residual stresses in metal samples, these methods feature satisfactory accuracy, convergence of results and are widely applied both for research and production purposes. RESULTS AND THEIR DISCUSSION. A brief description is given to the production process of samples used for residual stress research by the mechanical method using UDION-2 research equipment. The diagrams of residual stress distribution in the surface layer of samples after longitudinal turning with a varied feed are obtained. The measurement results received through the use of the mechanical method and XRD analysis on sample surface are compared. Consideration is given to the features of methods and equipment for the study of technological residual stresses, which includes the UDION-2 research equipment for residual stress measurement by the mechanical method and the XRD XStress 3000 G3R diffractometer. CONCLUSIONS. The growth of the feed is accompanied by the increase in the depth of the minimum residual stresses, the depth of the active area of residual stress diagrams and the decrease in the value of the tangential stress τ_zx0 on the surface. A sufficiently high convergence of the measurement results of residual stresses on the sample surface by the mechanical method and X-ray diffraction analysis is found.

residual stresses, longitudinal turning, high strength stainless steel, X-ray diffraction analysis (XRD-analysis), mechanical method for residual stress determination, surface layer

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