ANALYSIS OF THE POSSIBILITY OF NON-DESTRUCTIVE TESTING OF THE CARBURIZING DEPTH OF 18KHGT STEEL USING POLE MAGNETIZATION

Abstract

High-voltage transmission parts of energy-saturated machines are made of cemented steels subjected to chemical-thermal treatment. In low carbon steel, a strong high carbon surface layer is formed with a relatively soft and viscous core of the product. Non-destructive magnetic control of the depth of the hardened layer is based on the difference in the physical properties of the surface layer and the core of the product. The coercive force Hc has received the greatest application for quality control of surface hardening. One of the most common methods for controlling the properties of products made of ferromagnetic materials according to the results of the indirect determination of Hc is the “point pole” method. The modern implementation of the “point pole” method is implemented in the device “Magnetic Sorter MS-1”. The device measures the gradient of the normal component of the remanent magnetization field above the point of contact of the magnet pole with the surface of the product being monitored. The studis showed that there is a close correlation between the carburizing depth of the studied samples of 18KhGT steel and the readings of the MS-1 device. This is a prerequisite for the development of a non-destructive method for controlling the quality of cementation of gears of transmissions of mobile machines.