Abstract
The continuous method of deformational nanostructuring is presented. It consists of simultaneous applying of the tensile deformation by drawing, bending deformation while going via the rolls system and twisting deformation to the continuously moving wire. Combination of different kinds of deformation makes it possible to change in a wide range its mechanical properties matching high strength and ductility. The advantage of this scheme of deformational processing consists in arranging together tools which are used in metal ware manufacturing industrial processes as well as its simplicity and compatibility with rates at coarse and middle drawing processes. The scheme of the laboratory unit for the method implementation is considered. Wire from medium carbon steel of grade 50 was chosen as the object for investigation because it is considered to be the needed kind of metal ware product. Chemical composition and mechanical properties of this wire are described. Experiments on investigation of the possibility for ultrafine-grained structure formation effectiveness in carbon steel wire were conducted using the developed laboratory unit. Deformation modes and drawing route are given. Microstructure of the wire from medium carbon steel of grade 50 was studied after different kinds of deformational processing in longitudinal and transversal cross-sections. During experimental researches the effect of deformational processing on carbon steel wire microstructure was specified as well as its anisotropy in the cross section. The mechanical properties of the wire of grade 50 steel were studied after different kinds of deformational processing. The verification of these properties was carried out in accordance with the demands in current national wire standards. It was proved that carbon steel wire mechanical properties matches well with norms set in GOST17305-91. Investigation results of microstructure and mechanical properties of the wire from medium carbon steel of grade 50 after different kinds of deformational processing show the perceptiveness of the chosen direction for combination of different kinds of deformation for ultrafine-grained structure formation in carbon steel wire.
Highlights
Microstructure of the wire from medium carbon steel of grade 50 was studied after different kinds of deformational processing in longitudinal and transversal cross-sections
During experimental researches the effect of deformational processing on carbon steel wire microstructure was specified as well as its anisotropy in the cross section
The mechanical properties of the wire of grade 50 steel were studied after different kinds of deformational processing
Summary
0,47 – 0,55 0,17 – 0,37 0,50 – 0,80 до 0,250 до 0,040 до 0,035 до 0,250 до 0,250 до 0,080 наноструктурирования проволоки из высокоуглеродис тых марок стали основан на совмещении волочения с другими методами деформационного воздействия. Данный метод включает деформацию длинномерного металла волочением через две последовательно соосно расположенные и неподвижно закрепленные конусные волоки с дополнительным деформационным воздействием сдвигом за счет одновременного знакопеременного изгиба металла и его кручения вокруг своей продольной оси в зоне между волоками. Осуществление деформационного процесса длинномерных заготовок за счет одновременного знакопеременного изгиба металла и его вращения вокруг своей продольной оси в зоне между волоками позволяет обеспечить за цикл обработки значительные суммарные деформации. Что данный метод непрерывного деформационного наноструктурирования широко используется при лабораторных исследованиях по установлению влияния различных технологических факторов на формирование ультрамелкозернистой структуры в низко- и высокоуглеродистой проволоке различных марок и диаметров [24 – 25]. Исследование структуры и некоторых свойств проволоки из углеродистой стали 50 при волочении представлено в настоящей работе
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