Method for preparing large-specification TC4 titanium alloy cast ingot through high-proportion defective titanium materials

Abstract

The invention discloses a method for preparing a large-specification TC4 titanium alloy cast ingot through high-proportion defective titanium materials. The method comprises the steps that 1, the block-shaped and sheet defective TC4 materials are tied into defective material electrodes; 2, the defective material electrodes are welded and cleaned; 3, the cleaned defective material electrodes are smelted to obtain an intermediate cast ingot; 4, the intermediate cast ingot is subjected to one heating number forging, and a long-strip-shaped electrode is obtained and subjected to coping and pickling; 5, the long-strip-shaped electrode subjected to pickling and a sponge titanium electrode block are assembled and welded, and a consumable electrode is obtained and cleaned; and 6, the cleaned consumable electrode is smelted, and the TC4 titanium alloy cast ingot is obtained. According to the method, through reasonable material distribution and multiple times of vacuum consumable electric arc smelting, the large-specification TC4 titanium alloy cast ingot is obtained, the adding proportion of the defective TC4 titanium materials is increased, the content nonuniformity of the defective TC4 titanium materials is reduced, the cleanliness of the TC4 cast ingot is ensured, and the yield and the production efficiency of the TC4 cast ingot are improved.

Description

technical field [0001] The invention belongs to the technical field of titanium material production engineering, and in particular relates to a method for preparing large-scale TC4 titanium alloy ingots by using high-proportion titanium residues. Background technique [0002] The processing cost of titanium material is high, and the finished product rate is low. After smelting and deep processing of raw material sponge titanium, there will be about 30% to 35% residues, most of which can be recycled. According to statistics, the profit of residual titanium recycling reaches more than 60%, which produces huge economic benefits. Therefore, in order to reduce costs, reduce waste of resources, and provide raw material security, it is necessary to make full use of residual materials. [0003] TC4 is the most widely used titanium alloy and occupies a pivotal position in today's international titanium alloy market. A large number of residual waste materials will be produced in the...

AI Technical Summary

Problems solved by technology

A traditional method is to mix swarf-like TC4 titanium residues with sponge titanium (including intermediate alloys) to press electrode supports, and melt them into ingots. The addition of residues in this method is low, generally below 30%, and during the smelting process Easy to drop; the other is to use all block or sheet-like residues to bundle and weld the residue electrode. Due to the uneven shape of the residue, there is a possibility of foreign matter entering during the welding process of consumable electrodes, and during the smelting process The melting pool is unstable, which affects the composition and surface quality of the ingot. The TC4 recycled ingot produced often has shortcomings such as high impurity content, uneven composition, poor surface quality and large amount of peeling.

In addition, using the bundling method to make the block and flake residue into the residue electrode, the ingot shape is limited, and the diameter of the recycled ingot is generally less than Φ720mm, and the production efficiency is low.

Images