Abstract
Measurements of the magnetic characteristics (coercive force, residual induction, induction of saturation) of objects that had different thicknesses of the hardened layer were made. The influence of an unstressed core on the measurement results, as well as the depth of the strengthened layer on the shape of the hysteresis loop, is investigated. The conclusion is made that it is possible to estimate the properties of a hardened layer by means of a single measurement with the help of the hardware-software system DIUS-1.15M
Highlights
Such type of the processing of products as surface hardening of steel products is carried out to improve their wear resistance and fatigue failure resistance.The main types of surface hardening include the surface hardening of steel using the various methods of heating the product; chemical-thermal treatment of steel, hardening by the method of surface-plastic deformation [1]
DIUS-1.15M can be used for non-destructive testing of ferromagnetic products in the presence of a correlation relationship between the controlled parameters and the magnetic properties measured by the device
During carrying out the study, it has been established that the depth of the strengthened layer can be determined from the magnitude of the magnetic field corresponding to a given value of the induction on the descending branch of the magnetic hysteresis loop
Summary
Such type of the processing of products (automotive valves, rolls, etc.) as surface hardening of steel products is carried out to improve their wear resistance and fatigue failure resistance. For a separate determination of the depth and hardness of a hardened layer, it is necessary to measure twice the average value of the coercive force of the controlled section of the product with the help of two additional transducers of different sizes. This aspect increases the complexity of control significantly. The tasks of this investigation were: - determination of optimal parameters for measuring the depth of a hardened layer for local magnetization of a two-layer ferromagnetic object; - determination of the influence of the hardened layer on the shape of the magnetic hysteresis loop
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