Vanadium alloy is an alloy composed of vanadium and other alloying elements. Vanadium alloy has small fast neutron absorption cross section, good corrosion resistance to liquid metal lithium, sodium, potassium and so on, good strength and plasticity, good processing performance, can resist radiation embrittlement, anti-radiation swelling, has good dimensional stability under irradiation, is an important reactor structural material. Typical vanadium alloys include v-15ti-7.5 Ct, v-15cr-5ti, v-10ti, v-20ti, v-9cr-3fe-1.5zr-0.05c. These vanadium alloys are used as fuel cladding and structural components for liquid-metal-cooled fast breeder reactors.
Pure metal is used for smelting alloys in magnetic levitation furnace. The purity of other raw materials are all greater than 99.5%. Raw materials are evenly mixed, and cold pressing into Φ 50 mm spindle, into the magnetic suspension in the water cooled copper crucible furnace. Under the heating of high frequency induction current, the spindle melts rapidly from the surface to the inside, and further homogenizes under the stirring of magnetic force. Ar gas is used to protect the alloy from oxidation. Each spindle is smelted three times to ensure even composition of alloy. After forging, hot rolling and cold rolling, the alloy ingot becomes 0.5-1mm thin plate. Finally, it is vacuum annealed at 1100℃ for 1 h, the vacuum degree is better than 4 × 10-4pa, and uniform recrystallization structure is obtained. Forging temperature 950 ~ 1150 ℃, hot rolling temperature 850 ℃. All hot processing is done in air, with techniques such as surface coating and copper cladding used to prevent the alloy from absorbing oxygen, nitrogen and other impurities from the air.
Hardness test sample (HT) and tensile sample (TT) were cut from alloy plate by electric spark cutting. The TEM sample is flushed out from the sheet with thickness of 0.25mm by stamping method. The size of the three samples respectively: 10 mm x 5 mm x 1 mm (HT), 8 mm * 3 mm * 0. 5 mm range of sample (TT) and Φ 3 mm. The length of the tensile specimen is parallel to the rolling direction of the plate.
