Relationship between residual stresses and magnetic noise Barkhausen in elastoplastic deformation
In connection with the emergence of new materials and technologies for their processing in various branches of engineering, in particular, aircraft construction, nuclear engineering, mining, transport gas and oil pipelines, the number of criteria for assessing the strength and reliability of the products is increasing. When designing and manufacturing critical products, one of the regulated parameters is the level of residual macrostresses in the surface layer and its distribution along the depth of the part. To monitor the level of residual macrostresses, it is important to use non-destructive testing methods, for example, the X-ray diffractometry method, and for operational control, the Barkhausen noise recording method. The values of residual macrostresses were measured by X-ray diffractometry and a magnetic noise parameter using the Barkhausen noise method on the surface of elastically and plastically deformed planar samples from carbon structural steels St3, 40X, 45. The samples were loaded according to the net bending scheme. The correlation coefficient between the magneto-noise parameter and the main total voltages (residual voltages + voltages from the applied load) was determined, as well as the intensity of total voltages. A close correlation was found between the magneto-noise parameter and the intensity of total stresses during plastic deformation. The dependence of the value of the magnetic-noise parameter for plastically deformed samples on the residence time is determined. The results of the measurements show that in the course of the selected time interval the value of the magnetic-noise parameter remains practically constant. The results of the work can be used to control the physical and mechanical properties of the surface of products in industrial plants under conditions of serial and mass production.