cvmetИзвестия вузов. Цветная металлургияIzvestiya. Non-Ferrous Metallurgy0021-34382412-8783НИТУ МИСИС10.17073/0021-3438-2018-5-66-71cvmet-804Research ArticleМеталловедение и термическая обработкаPhysical Metallurgy and Heat TreatmentИССЛЕДОВАНИЕ ЭВОЛЮЦИИ СТРУКТУРЫ ДВУХФАЗНОГО ТИТАНОВОГО СПЛАВА В ПРОЦЕССЕ ТЕРМОДЕФОРМАЦИОННОЙ ОБРАБОТКИSTUDY INTO STRUCTURAL EVOLUTION OF TWO-PHASE TITANIUM ALLOY DURING THERMAL DEFORMATION PROCESSINGЧурюмовА. Ю.ChuryumovA. Yu.

канд. техн. наук, доцент кафедры металловедения цветных металлов (МЦМ),

119049, г. Москва, Ленинский пр-т, 4

Cand. Sci. (Tech.), associate prof. of the Department of physical metallurgy of non-ferrous metals (PMNFM), 

119049, Moscow, Leninkii pr., 4

churyumov@misis.ruСпасенкоВ. В.SpasenkoV. V.

студент кафедры металловедения цветных металлов (МЦМ),

119049, г. Москва, Ленинский пр-т, 4

student, Department of physical metallurgy of non-ferrous metals (PMNFM),

119049, Moscow, Leninkii pr., 4

ХажинаД. М.HazhinaD. M.

студентка кафедры металловедения цветных металлов (МЦМ),

119049, г. Москва, Ленинский пр-т, 4

student, Department of physical metallurgy of non-ferrous metals (PMNFM),

119049, Moscow, Leninkii pr., 4

МихайловскаяА. В.MikhaylovskayaA. V.

канд. техн. наук, доцент кафедры МЦМ,

119049, г. Москва, Ленинский пр-т, 4

Cand. Sci. (Tech.), associate prof. of the Department of PMNFM,

119049, Moscow, Leninkii pr., 4

mihaylovskaya@misis.ruСолонинА. Н.SoloninA. N.

канд. техн. наук, зав. кафедрой МЦМ,

119049, г. Москва, Ленинский пр-т, 4

Cand. Sci. (Tech.), head of the Department of the PMNFM,

119049, Moscow, Leninkii pr., 4

solonin@misis.ruПросвиряковА. С.ProsviryakovA. S.

канд. техн. наук, ст. науч. сотр. кафедры МЦМ,

119049, г. Москва, Ленинский пр-т, 4

Cand. Sci. (Tech.), senior researcher of the Department of PMNFM,

119049, Moscow, Leninkii pr., 4

pro.alex@mail.ruНациональный исследовательский технологический университет (НИТУ) «МИСиС»РоссияNational University of Science and Technology (NUST) «MISIS»Russian Federation201813102018056671Copyright © Чурюмов А.Ю., Спасенко В.В., Хажина Д.М., Михайловская А.В., Солонин А.Н., Просвиряков А.С., 20182018Чурюмов А.Ю., Спасенко В.В., Хажина Д.М., Михайловская А.В., Солонин А.Н., Просвиряков А.С.Churyumov A.Y., Spasenko V.V., Hazhina D.M., Mikhaylovskaya A.V., Solonin A.N., Prosviryakov A.S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://cvmet.misis.ru/jour/article/view/804

Исследовано поведение двухфазного титанового сплава Ti–3,5Fe–4Cu–0,2B в процессе термодеформационной обработки на одноосное сжатие. Бор вводили для получения в литом состоянии мелкозернистой структуры. Образцы сплавов диаметром 6 мм получали путем сплавления чистых компонентов в вакуумной индукционной печи и последующей ускоренной кристаллизации в массивной медной изложнице. Испытания на одноосное сжатие с истинной деформацией 0,9 проводили на комплексе физического моделирования термомеханических процессов «Gleeble 3800» при температурах 750, 800 и 900 °С и скоростях деформации 0,1; 1 и 10 с–1. Микроструктуру сплава в исходном и деформированном состояниях изучали с помощью сканирующей электронной микроскопии. В результате испытаний построена модель зависимости напряжения течения от температуры и скорости деформации. Показано, что в процессе обработки давлением происходит рекристаллизация исходной литой структуры, содержащей твердые растворы на основе α-Ti, β-Ti и колонии диборида титана. В процессе деформации с повышением температуры объемная доля зерен твердого раствора на основе α-титана уменьшается, а доля β-фазы, наоборот, возрастает. При этом средний размер зерен твердых растворов на основе α-Ti и β-Ti меняется незначительно после деформации почти по всем исследованным режимам. Показано, что предпочтительным режимом горячей обработки давлением для получения высокого комплекса механических свойств в изучаемом сплаве является диапазон температур 750–800 °С, так как размер зерен α-фазы увеличивается с 2,2 до 4,5 мкм при повышении температуры до 900 °С.

This paper studies Ti–3,5Fe–4Cu–0,2B two-phase titanium alloy behavior during its thermal deformation processing under uniaxial compression. Boron was added to obtain a fine-grained structure in the cast state. Samples of alloys 6 mm in diameter were obtained by melting pure components in a vacuum induction furnace with their subsequent crystallization into a solid copper mold. Uniaxial compression tests with a true strain of 0,9 were performed using the Gleeble 3800 thermal-mechanical physical simulation system at 750, 800 and 900 °C and strain rates of 0,1; 1 and 10 s–1. Scanning electron microscopy was used to study the microstructure of the alloy in its initial and deformed states. A model of flow stress dependence on temperature and strain rate was built as a result of the tests. It is shown that pressure treatment involves recrystallization of the initial cast structure containing solid solutions based on α-Ti, β-Ti and titanium diboride aggregates. During the deformation process, the volume fraction of α-titanium solid solution grains decreases with rising temperature, and the fraction of the β phase, on the contrary, increases. In this case, the average grain size of solid solutions based on α-Ti and β-Ti varies insignificantly after deformation in almost all of the studied modes. It is shown that the preferred mode of hot pressure treatment for obtaining a high complex of mechanical properties in the investigated alloy is a temperature range of 750– 800 °C, since α-phase grain sizes increase from 2,2 to 4,5 μm with an increase in temperature to 900 °C.

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The authors declare that there are no conflicts of interest present.