THE FORMATION OF THE FRICTION SURFACE OF MACHINE PARTS OF WEAR RESISTANT GRADIENT STRUCTURES BY MEANS OF COMBINED ELECTROMECHANICAL PROCESSING

The purpose of research in this work is to increase the wear resistance of friction surfaces of machine parts by implanting materials based on tungsten carbide, providing a modified surface layers with improved physical and mechanical properties in comparison with wear-resistant coatings obtained by traditional methods of processing.

The technology of implanting a combined Electromechanical treatment is implemented on a special installation, which is a technological complex consisting of: a universal machine (used for machining workpieces) with the appropriate tools and devices for fixing the workpiece and the supply of electric current of high power and low voltage; power unit for the conversion of industrial electric current; control unit processing modes; means of switching and supply of lubricating-cooling technological medium; unit interface with PC.

In the process of implanting tungsten carbide particles were introduced into the formed surface layer, reinforcing it. Then, on the same surface, Electromechanical treatment was carried out on the reinforcing modes.

It is experimentally established that in fact the surface layer of carbon steel 45 is a gradient structure similar to the structure of tool steel P18, and with a higher hardness as a consequence of the composite hardening of the released carbide phases of different morphology. The gradient structure is a cellular supercooled austenite stabilized by tungsten and reinforced with a carbide mesh consisting of aggregated highly dispersed (less than 1 µm) filamentous and rounded tungsten carbide particles. The presence of a gradient structure with a smooth transition to the main metal matrix of steel 45 provides monolithic adhesion of hardened layers that do not peel off from each other during wear.

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