Multi-component alloy composite reinforced high-strength titanium alloy and preparation method thereof

Abstract

The invention relates to a multi-component alloy composite reinforced high-strength titanium alloy and preparation thereof. The alloy comprises the following components in percentage by weight: 7-9% of vanadium, 3-5% of molybdenum, 2.5-3.5% of aluminum, 1.5-4.5% of chromium, 0.5-4.5% of zirconium, 0.5-3.5% of niobium and the balance of titanium and inevitable impurities. The preparation method comprises the following steps: melting in a vacuum arc remelting furnace; and peeling a melted titanium alloy ingot blank, performing hot forging, performing hot rolling, performing solution treatment, and aging to obtain the high-strength titanium alloy material. The titanium alloy prepared by the invention has excellent strength and plasticity matching; and the tensile properties at room temperature are as follows: sigma b is no less than 1300MPa, delta is no less than 10%, and psi is no less than 30%. The alloy material provided by the invention can be prepared into rods and plates, is applicable to high-strength fasteners, high-strength load-carrying structural parts, high-elasticity springs and the like, and has wide application prospects.

Description

technical field [0001] The invention belongs to a beta titanium alloy and a preparation method thereof, in particular to a multi-component alloy composite strengthened high-strength titanium alloy and a preparation method thereof, as well as forging, rolling and heat treatment methods. Background technique [0002] Since a large amount of titanium was produced by the Kroll method in 1932, titanium alloys have quickly become key materials in the aerospace field. However, with the increasing performance requirements of modern aerospace vehicles, the existing structural titanium alloys (generally less than 1300MPa in strength) are difficult to meet the needs. In order to further reduce the structural weight, the research and development of high-strength titanium alloys is urgently needed. [0003] In the high strengthening process of titanium alloys, β-type titanium alloys have good cold and hot processing properties, are easy to forge, can be rolled and welded, and can obtain ...

AI Technical Summary

Problems solved by technology

However, many titanium alloys bring about the loss of plasticity while increasing the strength. The American TIMETAL company has developed Ti-555 and Ti-55531 high-strength near-β-type titanium alloys, and their tensile strengths have reached the level of 1250-1400MPa, but their The plasticity does not meet the requirements of use

In short, the strength of existing titanium alloys, especially the matching of strength and toughness cannot meet the aviation requirements, and the cost of the alloy is too high, and the performance of the alloy is sensitive to process parameters, which limits its application to a certain extent.