Production process for large-diameter fine isometric crystal tissue titanium alloy bar

Abstract

The invention provides a production process for a large-diameter fine isometric crystal tissue titanium alloy bar. The production process comprises the following steps of: repeatedly performing substituting forging on a titanium cast ingot which comprises the following raw materials in parts by weight: 6.0-6.2 parts of aluminum, 3.8-4.1 parts of vanadium, less than or equal to 0.10 part of iron, 0.18-0.15 part of oxygen, 0.01 part of carbon, 0.01 part of nitrogen, 0.005 part of hydrogen and the balance of titanium to obtain a bar blank, wherein the macrostructure of the bar blank meets the requirement of lower than grade 3; putting the bar blank into a rolling machine to be rolled into a bar; and annealing the bar.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a production process of a titanium alloy rod with a large diameter and a fine equiaxed grain structure. Background technique [0002] Among titanium alloys of different grades and alloy compositions, Ti-6Al-4V is the most representative of production technology, the most widely used, and the largest amount of titanium alloy. Its comprehensive performance and cost are more cost-effective among all titanium alloys. Highest. In recent years, the research on the development of various grades of titanium alloy bar products has gradually tended to: how to improve and stabilize its intrinsic performance and quality in the production practice process, and expand its use range and conditions to meet the needs of aviation, aerospace, ships, etc. And the higher-level requirements and increasing demand for this alloy in the military. Among them, the demand for...

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Problems solved by technology

For small-sized (below Φ50) rods and wires, Φ470mm titanium ingots are used for forging and rolling according to the normal processing heat and deformation. Basically, small-sized titanium rods that meet the standard requirements can be produced, but for large-diameter specifications ( Φ60~Φ120mm) titanium rods have difficulties in the production and processing process: one is to use titanium ingots with a single weight of less than 2 tons to produce titanium rods of this specification range, and carry out billet opening, several fires and forgings according to the traditional process. Press or electro-hydraulic hammer can meet the standard requirements, but the production efficiency is too low, and the output cannot meet the demand of large quantities; the second is to directly use titanium ingots of less than 2 tons to open billets and enter them into large rolling mills for rolling. Although the efficiency has been improved, the overall deformation rate is not enough to meet the requirements of a good microstructure; the third is to use titanium ingots with a single weight and a larger diameter to carry out blanking, square drawing, and lengthening to the size of the entrance of a large rolling mill. Although re-rolling can improve the final microstructure, the requirements for oversized equipment and intermediate processes are more stringent during billet opening and processing, and there are still relatively few oversized equipment capable of processing large-sized titanium ingots in China.

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