Особенности формирования ультрамелкозернистой структуры и механических свойств проволоки после непрерывного метода деформационного наноструктурирования

Abstract

The essence of developed approach concludes the simultaneous imposition on continuously moving wire the di-latational strain wire drawing, the bending strain in transit through system of rollers and twisting strain. Highly carbo-naceous wire was selected as the subject of studies, since it is the claimed form of metal wire production and the for-mation of ultrafinegrain structure in it is one of the directions of improving its performance properties. The results of conducted metallographic investigations showed that such deformation action combination on wire made of high-carbon steel 75 leads to crushing of its separate structural components, which size becomes less than 1000 nm, so it makes possible to classify the obtained structure as ultrafine-grain. As a result conducting mechanical tests it is estab-lished that the simultaneous action on high-carbon steel of dilatational strains and twisting leads to an increase of wire strength and plastic properties. The uniform microhardness distribution by wire section makes it possible to judge the uniformity of obtained structure and properties.