Method for processing metastable beta-type titanium alloy plate

Abstract

The invention relates to a method for processing a metastable beta-type titanium alloy plate and belongs to the technical field of titanium alloy processing. The invention aims to overcome defects in the prior art, provides technology for processing a Ti-15-3 alloy plate and improves the cold working performance of alloy. The method for processing the metastable beta-type titanium alloy plate comprises the following steps of: smelting the titanium alloy plate into an ingot, charging at the temperature of between 800 and 850 DEG C and keeping the temperature for 100 to 150 minutes, raising the temperature to between 1,100 and 1,150 DEG C and keeping the temperature for 240 to 360 minutes, and finishing the first fire by repeatedly upsetting and drawing; drawing unidirectionally until cogging is finished so as to obtain a blank; sawing and rolling the plate blank into a hot-rolled plate blank with the thickness of 4 to 10 mm at the temperature of between 850 and 1,000 DEG C; and cold rolling to obtain a plate with the thickness of 1 to 3 mm after annealing and alkaline and acid washing. By controlling the rolling temperature, the deformation degree and the cooling speed after deformation, the method controls the structure of a forging stock to fully break the forging stock, and effectively suppresses phase precipitation resulting in a brittle alloy. Therefore, the cold working plasticity and cold working performance are improved.

Description

technical field

[0001] The invention relates to a method for processing a metastable β-type titanium alloy plate, belonging to the technical field of titanium alloy processing. Background technique

[0002] Titanium and titanium alloys are metal materials with excellent performance, which are widely used in aerospace, petrochemical, thermal and atomic power generation, seawater desalination, naval ships, automobiles, sports and leisure, etc. Among them, titanium and titanium alloy plates are important product forms, accounting for more than 80% of the total output.

[0003] In general, β-type titanium alloys have high strength and excellent cold workability, but due to the precipitation of intermetallic compounds, the alloy is brittle (such as Ti-13V-11Cr-3Al) or has segregation (such as Ti-11.5Mo-6Zr- 4.5Sn) and other unfavorable factors hinder the application of β-type titanium alloys. In 1981, the American TIMET Company developed the Ti-15-3 alloy, which contains isomor...