Preparation method of titanium alloy slab

Abstract

The invention discloses a preparation method for a titanium alloy plate blank. The method comprises the following steps: providing a titanium alloy cast ingot and a vacuum consumable electro-arc furnace, and smelting the titanium alloy cast ingot in the vacuum consumable electro-arc furnace; forming a cast ingot to be subjected to cogging, a primary forging blank and a to-be-forged forging blank in sequence, heating the to-be-forged forging blank below a beta-phase transformation point, rotating the to-be-forged forging blank along an axial plane by 90 degrees and then forming a to-be-forged plate blank by carrying out transverse extension deformation forging on a quick forging press; and heating the to-be-forged plate blank below the beta-phase transformation point, rotating the to-be-forged plate blank along the axial plane by 90 degrees and then forming a finished product plat blank by carrying out longitudinal extension deformation forging on the quick forging press. Compared with a small-specification plate blank produced by a conventional small-specification plate blank forging technology, a large-specification high-performance titanium alloy plate blank produced by the method disclosed by the invention is greatly improved in unit weight and width, good in structural homogeneity and capable of meeting rolling requirements of a high-performance thick plate.

Description

technical field [0001] The invention relates to the field of titanium and titanium alloy processing, in particular to a method for preparing a medium-strength titanium alloy ultra-wide and high-performance thick slab. Background technique [0002] TC4 ELI titanium alloy has been widely used in aviation, aerospace, ships and other fields. At present, most of the slabs used in the industrial production of TC4 ELI titanium alloy plates are only billeted in the single-phase area or partially deformed in the two-phase area, and then rolled in multiple fires in the two-phase area to produce plates. The forging method of the slab is only produced by a simple axially elongated forging method, and its purpose is only to initially break the as-cast structure. [0003] The process of producing slab in the prior art is to forge the ingot by axial elongation after heating. Since the diameter of the largest ingot produced in China is Ф1000mm, the slab produced is limited by the specifica...

AI Technical Summary

Problems solved by technology

[0003] The process of producing slab in the prior art is to forge the ingot by axial elongation after heating. Since the diameter of the largest ingot produced in China is Ф1000mm, the slab produced is limited by the specification of the ingot. The width of the slab is limited, and the width of the slab that can be produced is not greater than 1200mm, which restricts the maximum production width of the finished plate

[0004] Moreover, the existing production method has relatively low requirements on the microstructure of the slab, and no deformation in the two-phase region is performed during the production process, or there is only a small amount of deformation in the two-phase region, and the deformation amount is not more than 50%.

Insufficient crushing of the original β grain boundary and uneven structure of the slab

It cannot meet the rolling requirements of high-quality thick plates with a thickness greater than 70mm