The tantalum alloy Ta-4Mo-4Re prepared by the above embodiment 2 is heated in the Muffle furnace to 1180℃, held for 30min, and the heated aluminum alloy ingot is moved to the electric screw press for rapid multi-direction mold opening, ensuring the cumulative deformation rate of 52%, and the first tantalum alloy is obtained.
The first tantalum alloy is annealed by vacuum recrystallization (first annealing treatment) through vacuum annealing furnace, and the first tantalum alloy after vacuum recrystallization annealing is cooled to obtain the second tantalum alloy. The vacuum degree of vacuum annealing furnace during the first annealing treatment is controlled to be 2.5x10-3Pa, the furnace temperature is 1450℃, and the annealing holding time is 100min.
The second tantalum alloy is obtained through two cycles according to the forging preforming and vacuum recrystallization annealing process. The grain size of the tantalum alloy inspected by sampling is 260um.
Select a suitable drill bit to punch holes in the third tantalum alloy, and then polish the inner wall of the hole, heat the third tantalum alloy after punching holes to 760℃ through Muffle furnace, and keep it warm for 20 minutes, select a suitable spinning mandrel to lubricate, put on the heated third tantalum alloy, and spin it one by one with a die on a hydraulic press. Control the deformation of each spinning pass ≤ 10%, and the total deformation of spinning ≥ 50%, until the third tantalum alloy is suitable for rolling pipes, the mandrel can be pulled out and the first tube blank can be obtained.
The first tube blank is annealed by vacuum annealing furnace (the second annealing treatment), the vacuum is cooled by vacuum annealing furnace, and the vacuum degree of vacuum annealing furnace during the second annealing treatment is controlled to 2.5x10-3Pa, the furnace temperature is controlled to 900℃, and the annealing and holding time is 100min, and the second tube blank is obtained.
Polish the internal and external defects of the second tube blank clean, polish the internal and external scratches, folds, cracks and other defects of the second tube blank clean to ensure that there is no defect residue, and obtain the third tube blank.
Select the appropriate roll and cold rolling mandrel, and carry out multi-pass cold rolling on the three-high mill to ensure that the deformation of each pass is 20-30%, the total deformation of cold rolling is ≥ 80%, and roll the third tube billet to the finished size to obtain tantalum alloy tube.
The rolled tantalum tube was cleaned and processed by wire-cutting machine to obtain semi-finished pipe with each tube length of 12000mm.
The semi-finished pipe is annealed by vacuum annealing furnace (the third annealing treatment), and the control vacuum degree of the vacuum annealing furnace during the third annealing treatment is controlled to be 5x10-3Pa, the furnace temperature is 1450℃, and the holding time is 100min. The semi-finished pipe after annealing is cooled to obtain tantalum alloy seamless pipe. The final result is Ta-4Mo-4Re seamless tantalum alloy tube.
