High-strength and high-plasticity alpha-beta titanium alloy and preparation method thereof

A titanium alloy and high-strength technology, which is applied in the field of high-strength and high-plastic α+β-type titanium alloy and its preparation, can solve the problems of reducing the specific strength, strength, and plastic variation of secondary alloys, and is not suitable for practical applications, and achieves a reduction in Grain size, effect of improving tensile strength
CN107746993AInactive Publication Date: 2018-03-02CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2018-03-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention discloses a high-strength and high-plasticity alpha-beta titanium alloy and a preparation method thereof, wherein the titanium alloy comprises, by weight, 20-30% of Zr, 4.5-7.5%of Al, 3-5% of V, less than or equal to 0.2% of O, less than or equal to 0.08% of C, less than or equal to 0.05% of N, and the balance of titanium and unavoidable impurities. The preparation method comprises: mixing titanium sponge, an Al-V intermediate alloy, pure Al and pure Zr according to a certain ratio, and pressing to form an electrode; carrying out two smelting to prepare a Ti-Al-Zr-V alloy casting ingot; cogging, and carrying out first forging to obtain a large-size forging member; carrying out second forging to obtain a large-size bar; carrying out third forging to obtain a small size bar; carrying out solid solution treatment, and carrying out air cooling; and carrying out aging treatment, and carrying out air cooling. According to the present invention, the obtained high-strength and high-plasticity alpha-beta titanium alloy has advantages of low cost, high strength, high plasticity and the like.
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Description

technical field

[0001] The invention relates to the technical field of metal material preparation and processing, and in particular relates to a high-strength and high-plasticity α+β-type titanium alloy and a preparation method thereof. Background technique

[0002] At present, the widely used commercial high-strength α+β-type titanium alloy mainly composed of titanium is Ti62222S (Ti 6 Al 2 sn 2 Mo 2 Cr 2 Zr 0.25 Si)Ti-6242(Ti 6 Al 2 sn 4 Zr 6 Mo) and BT23 (Ti 5 Al 4.5 V 2 Mo 1 Cr 0.6 Fe) The strength of these alloys is mainly 1100-1200Mpa, and the alloy strength is low; in addition, the α+β-type titanium alloy mainly composed of double alloy elements under development has extremely high cost, such as the patent No. 201310541532.1, "a titanium-zirconium-based Alloy preparation method "the weight percent of alloying elements contained in the titanium alloy is: Al: 5%; V: 3%; Zr: 30%-51%; although the tensile strength of its alloy (micron size detection) has rea...

Claims

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