Abstract
The structure of ultrafine-grained materials obtained by deformation methods under the influence of ultrasonic vibrations is investigated; new methods of intense plastic deformation have been developed with the imposition of ultrasonic vibrations, allowing the formation of an ultrafine-grained structure in extended materials; optimal modes of plastic deformation and heat treatment were determined, allowing one to achieve the highest thermal stability and ductility in combination with high strength of materials. The designs of ultrasonic oscillatory systems for obtaining extended bulk nanostructured materials were developed, and a technological scheme of producing an ultrafine-grained wire using ultrasonic processing with equal-channel angular broaching was tested. It is shown that this process of deformation processing is industrially applicable, and can be combined into a single technological cycle with wire drawing. The results can be used in engineering, instrument making and cable industry.
Highlights
The structure of ultrafine-grained materials obtained by deformation methods under the influence of ultrasonic vibrations is investigated; new methods of intense plastic deformation have been developed with the imposition of ultrasonic vibrations, allowing the formation of an ultrafine-grained structure in extended materials; optimal modes of plastic deformation and heat treatment were determined, allowing one to achieve the highest thermal stability and ductility in combination with high strength of materials
Что эффективность процесса измельчения исходной крупнозернистой структуры, следовательно, и уровень механических свойств обрабатываемой проволоки для каждого метода различны
Effect of ultrasonic treatment on the microstructure and properties of nanostructured nickel processed by high pressure torsion / A
Summary
The structure of ultrafine-grained materials obtained by deformation methods under the influence of ultrasonic vibrations is investigated; new methods of intense plastic deformation have been developed with the imposition of ultrasonic vibrations, allowing the formation of an ultrafine-grained structure in extended materials; optimal modes of plastic deformation and heat treatment were determined, allowing one to achieve the highest thermal stability and ductility in combination with high strength of materials. Целью данной работы является разработка метода деформационного измельчения структуры в протяженных материалах с использованием ультразвуковых колебаний, установление закономерностей изменения микроструктуры, механических свойств и термической стабильности протяженных ультрамелкозернистых материалов при воздействии ультразвуковой обработки. Что предлагаемые в настоящее время способы интенсивной пластической деформации (ИПД) не могут быть применены в массовом производстве для изготовления крупногабаритных изделий (например, при производстве проката или проволоки), поскольку размеры образцов, получаемых с использованием интенсивного кручения под высоким давлением, равноканального углового прессования и винтового прессования, невелики.
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