Effect of Annealing Method on the Performance of Titanium Coil
Titanium Coil annealing the entire volume can get uniform organization and performance are troubling everyone's problems. Annealing temperature is set too high, there will be cool bonding, a slight impact on the product surface quality, the serious will cause the entire volume of the adhesive cannot be opened, resulting in waste. Annealing temperature is set too low, it will produce the phenomenon of retreat impervious, although the inner and outer layers of titanium plate to achieve the performance requirements, but with the core product does not reach the purpose of recrystallization annealing, there will be excessive strength, obvious grain Smaller than the inner and outer phenomenon. This will lead to large fluctuations in the entire volume of performance, cannot be safe to use. In view of this situation, to develop a reasonable annealing system, to avoid bending at the same time, it is particularly important not to produce pinching phenomenon. Researchers through a large number of titanium coil test and explore, come to guide the technical data.
The materials for the test were melted, forged, and slab were prepared, hot rolled to 4.0-7.0mm hot rolled and cold rolled to 0.3-4.75mm, single rolled 720 ° C / 30min for titanium coated plates and 720 ° C / 6h heat treatment test, and then the heart of the plate, titanium band, external and internal sampling, contrast plate and titanium tissue at different locations and performance.
The results showed that the tensile strength and yield strength of the same volume of titanium roll with the thickness of 2.945mm, the whole roll of 720 ℃ / 6h and the single piece of 720 ℃ / 30min were the same, and the elongation was not significantly different. The same composition, 1.0mm titanium coil, the whole volume of 720 / 6h, single 720 / 30min heat treatment, tensile strength, yield strength are about 10MPa difference, the same elongation. The same composition, 0.5mm titanium coil, the whole volume 720 / 6h, single 720 / 30min heat treatments, tensile strength, yield strength, elongation is quiet.
Microstructure observation shows that after the 0.5mm strip and the whole roll of titanium strip are heat-treated at 720 C / 6h, the longitudinal, transverse and transverse structures can be obtained in the head, the middle and the tail. In order to compare the difference between the annealed coil and monolithic plate, the similar composition was selected at the same time, and the same annealing system was used to sample the plate. It was found that in the same annealing regime. , can get vertical and horizontal consistent organization.
The results show that the reasonable annual system can make the whole volume of annealed titanium strip get the same microstructure and properties. It is found that controlling the temperature and time of the heat treatment can make the whole volume of annealed titanium strip get the same uniformity as the annealed single sheet Organization and Performance.
