Preparation method of oversize width alloy plate

Abstract

The invention discloses a preparation method of an oversize width alloy plate. The preparation method comprises the following steps that a TA15 titanium alloy plate blank is taken as a raw material, the phase change temperature is 990 DEG C, the chemical components (in percentage by mass): 6.66% of Al, 1.66% of Mo, 2.20% of V, 2.08% of Zr and the balance of Ti are adopted, firstly, the plate blankis subjected to two heating numbers of hot rolling on a 2800 mm four-roller reversible hot mill, thus a semi-finished plate blank with the thickness being 20 mm is obtained, the deformation amount ofthe two heating numbers is 71% and 69% correspondingly, then one part of the semi-finished plate blank is subjected to beta quenching, and the other part is not treated; then two types of semi-finished plate blank are subjected to unidirectional rolling and reversing rolling correspondingly to obtain a semi-finished plate blank with the thickness being 4 mm, then pack ply-rolling is conducted, and after annealing and surface treatment are conducted, the oversize width TA15 titanium alloy plate with the size being 1.2 mm*1200mm*2500mm is obtained. The superplastic forming temperature is decreased, thus the mold cost is greatly lowered, the overheating risk of parts is reduced, the machining period is shortened, and the production efficiency and the production quality are improved.

Description

technical field [0001] The invention relates to the field of alloy plate preparation, in particular to a method for preparing an ultra-large and wide alloy plate. Background technique [0002] Superplastic forming / diffusion bonding (SPF / DB) technology has rapidly developed into an advanced titanium alloy forming technology widely used in the world due to its unique advantages. It plays a decisive role in reducing the weight of the structure. The quality of fine-grained titanium alloy plates is the key to determine whether SPF / DB titanium alloy parts can be maturely applied. The fine-grained plate preparation technology is also the most concerned cutting-edge technology in titanium alloy processing in the world. At present, it can stably produce wide-width superplastic The only countries with titanium alloy plates are the United States and Russia. TA15 titanium alloy has good processing performance, good comprehensive mechanical properties and process performance. Compared ...

AI Technical Summary

Problems solved by technology

However, the grain size and anisotropy control level of fine-grained TA15 titanium alloy sheets produced in China are still relatively poor.

This is mainly due to the difficulty in controlling the stability of the superplastic forming process, resulting in extremely unstable performance of superplastic forming parts and low yield, which greatly limits the wide application of fine-grained titanium alloy sheets.