Cold rolling method for beta titanium alloy thin plate

Abstract

The invention discloses a cold rolling method for a beta titanium alloy thin plate. The method includes the first step of placing a beta titanium alloy thin plate blank into a vacuum annealing furnacefor vacuum annealing at the temperature of 10 DEG C to 20 DEG C below the beta phase transformation point and then controlling the cooling rate and cooling to the room temperature; the second step ofconducting segment rolling on the cooled beta titanium alloy thin plate blank with a small-convexity cold rolling roll to obtain the beta titanium alloy thin plate in the target size. According to the method, the beta titanium alloy thin plate blank is subjected to vacuum annealing at the temperature of 10 DEG C to 20 DEG C below the beta phase transformation point, and the cooling rate is controlled, so that the primary alpha phase is sufficiently grown, and the residual beta phase volume content is reduced. The fact that the second phase precipitates too much and strengthens the alloy whichis then not easy to machine in the process of cooling to the room temperature with the furnace is avoided. By segment rolling, the orientation of most alpha phases tends to be uniform, and the defectlike cracking caused by uncoordinated deformation during the subsequent rolling process is overcome. The problem that the beta titanium alloy is difficult roll after the vacuum annealing is solved.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal processing, and in particular relates to a cold-rolling processing method for a β-titanium alloy thin plate. Background technique [0002] Titanium alloys have the advantages of low density, high specific strength, and good corrosion resistance, and have been widely used in industrial fields such as aerospace and automobiles. β-titanium alloy sheets and foils have received increasing attention due to their high specific strength and the ability to effectively reduce structural weight. [0003] The cold rolling process is the key technology for the preparation of titanium and titanium alloy sheets and foils. Although β-titanium alloy has good cold working ability, when it is rolled to a certain deformation, due to the work hardening effect of the material, the deformation resistance of the material increases sharply and the processing difficulty is greatly increased due to the easy cracki...

AI Technical Summary

Problems solved by technology

In this method, the β-titanium alloy sheet blank is vacuum annealed at 10°C to 20°C below the β-transition temperature and the cooling rate is controlled, so that the primary α-phase grows sufficiently, and at the same time reduces the volume content of the residual β-phase. In the process of cooling the furnace to room temperature, the precipitation of secondary phases is too much, which makes the β titanium alloy strengthen and difficult to process. The orientation of most α phases tends to be consistent through segmental rolling, which improves the deformation inconsistency in the subsequent rolling process. The cracking and other processing defects caused by it solve the problem of difficult rolling processing of β titanium alloy after vacuum annealing