FEATURES OF THE EFFECT OF COMBINING DIFFERENT KINDS OF PLASTIC DEFORMATION ON THE MICROSTRUCTURE GRINDING AND MECHANICAL PROPERTIES OF THE CARBON WIRE

Since the mechanical properties of metals and alloys with ultrafi negrained structure are very attractive from practical appliance one of the technology development approaches is the creation of continuous methods of severe plastic deformation. Implementation of current methods of nanostructuring to existing technological processes of metallurgical and steel wire production involves a number of limitations connected with the size of processed workpieces. The article shows the necessity of developing a method of continuous methods of severe plastic deformation which according to its technical and technological characteristics would be compatible with existing technological processes of metalware manufacture. Combining of diff erent kinds of plastic deformation is a perspective tendency. Carbon wire was chosen as an investigation object. Combination of external stress leads to enhancing the technological possibilities of drawing as the basic wire production operation to large extent. On the basis of combining drawing with bending and twisting new method for obtaining the ultra-fi ne grained structure in semi-product which is protected by the patent of the Russian Federation. The essence of the method is the simultaneous applying deformations of tension when drawing, bending when going through the system of rolls and torsional deformation on a conti nuously moving wire. Various hardware devices and tools already app lied for steel wire production can be used to implement this method thus simplifying its introduction to the current industrial equipment. Schematic diagram and description of the developed method are presented. Photographs of the carbon wire microstructure with diff erent carbon content after diff erent types of deformation eff ects are shown. It is proved that combining drawing with bending and twisting leads to carbon wire microstructure refi nement. It is shown that deformation combined eff ect on carbon wire allows to modify its mechanical pro per ties in a wide range, while matching its high strength and ductility.

combining, plastic deformation, carbon wire, drawing, bending, twisting, ultra-fi ne grained structure, mechanical properties

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