1500MPa-grade titanium alloy bar and preparation method thereof

By employing specific chemical compositions and multi-step processing techniques, the high cost of existing titanium alloy manufacturing processes has been resolved, resulting in the production of 1500MPa grade titanium alloy bars with high strength and good plasticity, meeting the performance requirements of the aerospace field.

CN120989434APending Publication Date: 2025-11-21CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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Patent Information

Application Number
CN202511222197.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-29
Publication Date
2025-11-21

AI Technical Summary

Technical Problem

Existing methods for preparing ultra-high strength titanium alloys have high production costs and cannot simultaneously achieve both ultra-high strength and good plasticity, thus failing to meet the high-performance requirements of the aerospace field.

Method used

By employing a specific chemical composition design and a multi-step processing technology, including vacuum consumable melting, multi-fire upsetting and drawing, two-phase forging, and multiple solution aging heat treatments, 1500MPa grade titanium alloy bars are prepared. By controlling the precipitation of β and α phases, the grain size is refined and the stability of the microstructure is improved.

Benefits of technology

It achieves high strength and good plasticity of 1500MPa grade titanium alloy bars, with tensile strength exceeding 1500MPa and elongation exceeding 6%, meeting the application requirements of the aerospace field and possessing cost advantages.

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Abstract

The invention discloses a 1500MPa-grade titanium alloy bar and a preparation method thereof, and belongs to the field of titanium alloy preparation. The 1500MPa-grade titanium alloy bar comprises the following chemical components in percentage by mass: 5.5 to 6.5 percent of V, 4.5 to 5.5 percent of Mo, 3.0 to 4.0 percent of Al, 2.5 to 3.5 percent of Zr, 1.5 to 2.5 percent of Cr, 1.5 to 2.5 percent of Nb, 0.9 to 1.1 percent of Fe and the balance of Ti and impurities. The preparation method comprises the following steps: preparing raw materials according to the components, pressing the raw materials into electrode blocks, welding to obtain consumable electrodes, and performing multi-vacuum consumable smelting to obtain cast ingots; the cast ingot is subjected to cogging forging in a beta area, multi-heating-number upsetting and drawing deformation in the beta area and forged into a bar in a two-phase area; and through multi-pass rolling and multiple solid solution aging heat treatment, the 1500MPa-grade titanium alloy bar is obtained, meanwhile, the ductility is kept to be 6% or above, and the requirement of future aerospace for high-performance titanium alloy is met.
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