Можливість отримання листового прокату з білого чавуну з підвищеною пластичністю
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Date
2023
Authors
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Journal ISSN
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Publisher
Харківський національний автомобільно-дорожній університет, Харків
Abstract
UKR: У роботі проведено дослідження технології виготовлення листового прокату, товщиною до 2 мм із білого ледебуритного чавуну, легованого ванадієм. Визначено вплив параметрів гарячої прокатки на структуру чавуну. Після термічного оброблення рівень механічних властивостей чавунного листа відповідає властивостям високоміцних броньових сталей, а показники твердості навіть їх перевершують.
ENG: Рroblem. In the work, a study of the technology of manufacturing sheet metal up to 2 mm thick from white ledeburite cast iron alloyed with vanadium was carried out. Сast-iron purveyances forged preliminary. After forging purveyances were rolled with the different wringing out. At rolling a total degree of deformation was 70 %. The additional annealing helped to bring down hardness of sheet and moulding of pipes became possible. White cast-iron has high plasticity because there are phase transformations in a vanadium eutecticum cementite. Goal. The goal of work is a study of sheet rolling of white cast-iron’s bars to use for the armour and weld-fabricated pipes. Methodology. Experimental cast iron contains 2.7–2.85 % C and up to 2 % V. 30 kg of castings were melted. The total degree of deformation was 70 %. After forging, rolling was carried out on a two-roll laboratory mill on rolls with a smooth barrel. Results. The technological scheme for the production of white cast iron forgings is applied, which includes preliminary annealing, forging with a degree of deformation from 10 to 15 %, intermediate annealing and final forging with a total ε = 70 %. Оriginality The use of carbide transformation in vanadium-doped cementite made it possible to carry out combined pressure treatment and obtain sheets up to 2 mm thick from iron castings Preliminary hot forging greatly stimulates and accelerates the process of cementite disintegration into austenite and vanadium carbides during high-temperature exposure. Rolling of forging blanks was carried out and the influence of thermal and deformation parameters on the structure of cast iron was investigated. Рractical value. Application of final heat treatment after deformation of cast iron provides a level of mechanical properties that corresponds to the properties of high-strength armor steels, and the hardness indicators even exceed them. Thinner sheets of such cast iron can be used to create compositions of multilayer armor with increased ballistic resistance from several materials with different properties.
ENG: Рroblem. In the work, a study of the technology of manufacturing sheet metal up to 2 mm thick from white ledeburite cast iron alloyed with vanadium was carried out. Сast-iron purveyances forged preliminary. After forging purveyances were rolled with the different wringing out. At rolling a total degree of deformation was 70 %. The additional annealing helped to bring down hardness of sheet and moulding of pipes became possible. White cast-iron has high plasticity because there are phase transformations in a vanadium eutecticum cementite. Goal. The goal of work is a study of sheet rolling of white cast-iron’s bars to use for the armour and weld-fabricated pipes. Methodology. Experimental cast iron contains 2.7–2.85 % C and up to 2 % V. 30 kg of castings were melted. The total degree of deformation was 70 %. After forging, rolling was carried out on a two-roll laboratory mill on rolls with a smooth barrel. Results. The technological scheme for the production of white cast iron forgings is applied, which includes preliminary annealing, forging with a degree of deformation from 10 to 15 %, intermediate annealing and final forging with a total ε = 70 %. Оriginality The use of carbide transformation in vanadium-doped cementite made it possible to carry out combined pressure treatment and obtain sheets up to 2 mm thick from iron castings Preliminary hot forging greatly stimulates and accelerates the process of cementite disintegration into austenite and vanadium carbides during high-temperature exposure. Rolling of forging blanks was carried out and the influence of thermal and deformation parameters on the structure of cast iron was investigated. Рractical value. Application of final heat treatment after deformation of cast iron provides a level of mechanical properties that corresponds to the properties of high-strength armor steels, and the hardness indicators even exceed them. Thinner sheets of such cast iron can be used to create compositions of multilayer armor with increased ballistic resistance from several materials with different properties.
Description
Т. Миронова: ORCID 0000-0003-0105-5479
Keywords
білий чавун, легування, карбідне перетворення, кування, пластичність, прокатування, механічні властивості, white cast iron, alloying, carbide transformation, forging, plasticity, rolling, mechanical properties, КМТОМ
Citation
Миронова Т. М. Можливість отримання листового прокату з білого чавуну з підвищеною пластичністю. Вісник Харківського національного автомобільно-дорожнього університету. 2023. Т. 1, № 103. С. 53–57. DOI: 10.30977/BUL.2219-5548.2023.103.0.53.