Different plastic deformation thermo-mechanical terms were tried out on Ni-Al-Co-based alloy in cast, prepressed and deformed conditions, and on Ti-Al-Nb-based alloy in cast and deformed conditions by yielding specimens with varying rate of deformation in interval between 10 and 70 % and varying deformation temperature in interval between 900 and 1200°С. Diagrams of tensile strength and elongation upon temperature dependence in Ni-Al-Co-based alloy in cast prepressed and deformed conditions and Ti-Al-Nb-based alloy in cast and deformed conditions are designed. Application features of protective technological coating based on glass enamel in isothermal forging of workpiece are examined. The results of heatresistance tests on Ni-Al-Co and Ti-Al-Nb-based alloys coated with different compositions of protection technological coating are shown. During the deformation these technological coatings have to be high temperature lubricant, that reduce force up to two times, necessary to deform workpiece. These protection technological coatings can be used at temperatures under 1250°С. The results of the work show, that optimal temperature for deformation intermetallic Ni-Al-Co-based superaloy workpiece were between 1140 and 1160°С. Dropping temperature below 1140°С leads to crack growing because of significant reduction of ductility. The results of the work show, that optimal temperature for deformation intermetallic Ti-Al-Nb-based workpiece were between 1150 and 1200°С.Keywords: intermetallic superalloy, Ni-Al-Co-based alloy, Ti-Al-Nb-based alloy, rheology, mechanical properties, gas turbine engines, technological coating, rheological properties. В ходе работы были опробованы режимы деформации методом прямой осадки образцов из интерметаллидного жаропрочного сплава системы Ni-Al-Co в литом, подпрессованном и деформированном состояниях и образцов из интерметаллидного жаропрочного сплава системы Ti-Al-Nb в литом и деформированном состояниях со степеня-ми деформации от 10 до 70 % в интервале температур от 900 до 1200°С. Построены графики зависимостей предела прочности и относительного удлинения от температуры в литом, подпрессованном и деформированном состояниях для сплава системы Ni-Al-Co и в литом и деформированном состояниях для сплава системы Ti-Al-Nb. Рассмотрены особенности применения защитных технологических покрытий на основе стеклоэмалей при изотермической штам-повке заготовок из сплавов систем Ti-Al-Nb и Ni-Al-Co. Приведены результаты испытаний на жаростойкость интер-металлидных сплавов систем Ni-Al-Co и Ti-Al-Nb с оптимальными составами защитных технологических покры-тий. В процессе деформации данные защитные технологические покрытия являются высокотемпературной смазкой, которая обеспечивает снижение усилия, необходимого для деформирования заготовок в 1,5 -2 раза, также при-менение защитных технологических покрытий обеспечивает достаточно легкое извлечение заготовки из штампа.
Термомеханическое поведение интерметаллидных сплавов систем Ni-Al-Co и Ti-Al-Nb при изотермической деформации
The work is devoted to the study of the processes of hot and cold plastic deformation of hard-to-deform shape memory alloys of the Ni–Ti–Nb and Ni–Ti–Nb–Zr systems. The optimal modes of deformation treatment of these alloys, which ensure the production of semi-finished products without surface defects, have been determined. Investigations of the mechanical properties of hot-deformed and cold-deformed semi-finished products from alloys of the Ni–Ti–Nb and Ni–Ti–Nb–Zr systems have been carried out. It is shown that the selected treatment modes of these alloys provide a high level of mechanical properties of materials.
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