Preparation method of high-strength titanium alloy wire

Abstract

The invention belongs to the technical field of material science, and relates to a preparation method of a high-strength titanium alloy wire. The adopted titanium alloy is prepared from the followingcomponents in percentage by mass: 6.3 to 7 percent of Al; 3.5 to 4.5 percent of Mo; 5.5 to 6.5 percent of V; 1.5 to 2.5 percent of Nb; 0.5 to 1.5 percent of Fe; less than or equal to 0.05 percent of C; less than or equal to 0.13 percent of O; less than or equal to 0.05 percent of N; less than or equal to 0.015 percent of H; and the balance of Ti. According to the invention, the alloy which keeps higher plasticity and toughness while having higher strength is adopted, temperatures above and below the phase transformation point are alternately used in the process of ingot cogging and rolling, consequently, original grains are sufficiently crushed, the microstructure is more uniform and finer, and a high-performance wire can be more easily obtained. In the whole process of processing, a special annealing process is not used, moreover, continuous rolling or furnace rerolling can be adopted below the phase transformation point, the process is simplified, the period is shortened, and the cost is reduced. In addition, by undergoing specified heat treatment, the processed wire can obtain excellent comprehensive property in which the tensile strength is higher than 1,500MPa, the elongationis higher than 8 percent and the shear property is higher than 950MPa.

Description

technical field [0001] The invention belongs to the technical field of material science and relates to a preparation method of high-strength titanium alloy wire. Background technique [0002] In order to meet the needs of reducing aircraft weight, reducing energy consumption, improving corrosion resistance, and excellent matching with carbon fiber composite materials, titanium alloy fasteners have become an indispensable key connection for advanced civil airliners and military aircraft. Under the same strength index, titanium alloy fasteners are 30% to 40% lighter than steel fasteners. The amount of fasteners used in an aircraft is hundreds of thousands or even millions, and the weight reduction effect is considerable. At present, TC4 titanium alloy fasteners are the most widely used, most used and most reliable titanium alloy fasteners on military and civilian aircraft at home and abroad. With the successful development and operation of large aircraft such as Boeing 787 an...

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Problems solved by technology

It can be seen from the table that at present, the strength of widely used fasteners is mainly at the level of 1100MPa, and the TB8 titanium alloy fastener is a typical representative of the developed high-strength titanium alloy fastener, reaching the level of 1250MPa. The need for high load carrying capacity

In the preparation of titanium alloy wire, with the increase of strength, the plasticity of titanium alloy will decrease obviously, and the subsequent fastener forming will be more difficult. Defects such as burrs are easy to form on the thread surface, and the surface integrity is difficult to guarantee.

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