A processing technology for a new type of high-temperature and high-specific-strength niobium alloy wire material can significantly improve the high-temperature mechanical properties of metallic niobium. Moreover, it has stable performance and uniform composition, and the tensile strength can reach 190MPa at 1400℃.
The processing technology of a new type of high-temperature and high-specific-strength niobium alloy wire material is special in that it includes the following steps:
(1) Billet rotary forging: Niobium alloy ingots are processed by extrusion or forging to obtain billets with a diameter of mm. After multiple rounds of rotary forging and heat treatment, they are processed into billets with a diameter of mm. The processing rate of each pass of rotary forging is controlled between 10% and 25%.
After each rotary forging process, a pickling and degreasing operation is carried out: a mixed acid is prepared, and then the adhering substances on the obtained billet are removed by pickling.
Among them, an intermediate heat treatment is carried out after each rotary forging process: the heat treatment temperature is 1400-1550℃, and the holding time is 60-120 minutes; The total processing rate between the two heat treatments is controlled between 50% and 85%.
(2) Surface oxidation film coating: Film coating is carried out in a resistance furnace under atmospheric or aerobic atmosphere, with the coating temperature controlled at 400-600℃ and the coating time at 5-20 minutes.
(3) Wire drawing: The obtained diameter wire blank undergoes multiple drawing processes and two heat treatments to produce finished wire with a certain diameter. The processing rate of each drawing pass is controlled between 10% and 30%, and the total processing rate between two heat treatments is controlled between 50% and 90%.
(4) Pickling: Prepare the mixed acid and then pickling to remove the adhering substances on the finished silk material obtained in step (5).
(5) Heat treatment of finished products: The heat treatment temperature is 1300 to 1450℃, and the holding time is 60 to 120 minutes.
