Исследованы закономерности формирования гетерофазной структуры в дисперсноупрочнённых ванадие вых сплавах V-Me(Cr, W)-Zr-C в зависимости от режимов их термомеханической обработки. Найдены режимы обработки, обесп ечивающие значительное повышение дисперсности и однородности пространственного распределения частиц ZrC, темп ературы рекристаллизации и высокотемпературной (при Т = 800 ºС) кратковременной прочности по сравнению с традиционными режимами обработки. Ключевые слова: сплавы ванадия, термомеханическая обработка, электронная микроскопия, микроструктура, дисперсное упрочнение, механические свойства.
a b s t r a c tFormation of regularities of the nanometric oxide precipitates and defect microstructure in vanadium-based low activation alloys V-Cr-Zr-(C,N,O) and V-Cr-W-Zr-(C,N,O) as a function of the regimes of their thermochemical treatment was investigated. Several methods of internal oxidation which provide formation of the nanosized ZrO 2 particles of controllable dispersion, ensure the nanometric size of the heterophase structure to be maintained up to the temperatures as high as 1300-1400°С, and allow the recrystallization temperature to be increased up to ≥1400°С were proposed. Formation of such microstructure contributes to dispersionand substructural hardening and results in more than twofold increase in the yield stress of these alloys both at room and elevated (800°С) temperatures, compared to the conventional thermo-mechanical treatment.
Substrate materials are the key element of the coated conductors. There are two types of substrates-nontextured (stainless steel (SS) or Hastelloy alloys) and textured ones which are based on the Ni-W alloys. The main requirements for the textured tapes (RABiTS) are the presence of the highly pronounced biaxial cubic texture {100} < 100 > and low values of magnetic susceptibility. To realize these requirements RABiTS tapes of various kinds were developed-homogenous tapes from Ni-W alloys with W content 5.5-9 at.% and composite ones. Composite tapes consist of three layers-one of SS and two of Ni-W alloy with W content 6 at.%. Mechanical and magnetic properties of the tapes were investigated and the dependence of tapes texture quality from total accumulated deformations was studied. The ultimate tensile strength value of composite tapes was 750 ± 10 MPa. The conditions necessary to form the required {100} < 100 > texture are different for the homogeneous and composite tapes. According to the magnetic measurements saturation magnetization of composite tapes is about a factor of two lower than for similar homogeneous tapes.
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