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Ultrahigh-strength titanium alloy and preparation method thereof

An ultra-high-strength, titanium alloy technology, applied in the field of ultra-high-strength titanium alloys and their preparation

Inactive Publication Date: 2013-09-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem that existing high-strength titanium alloys do not have high strength and high plasticity at the same time, and provides an ultra-high-strength titanium alloy and its preparation method

Method used

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  • Ultrahigh-strength titanium alloy and preparation method thereof
  • Ultrahigh-strength titanium alloy and preparation method thereof
  • Ultrahigh-strength titanium alloy and preparation method thereof

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specific Embodiment approach 1

[0010] Specific Embodiment 1: In this embodiment, an ultra-high-strength titanium alloy consists of 3.0% to 5.0% Al, 4% to 6% Mo, 5% to 7% V, and 2% to 4% Cr in this embodiment , 1% to 3% of Sn, 0.5% to 1% of Fe, the balance being Ti and unavoidable impurities.

[0011] The unavoidable impurities mentioned in this embodiment are O, H, N, C, Si, etc., wherein O≤0.1%, C≤0.08%, H≤0.0005%, N≤0.02%.

[0012] The ultra-high-strength titanium alloy described in this embodiment is a Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe alloy, which belongs to a nearly β-type titanium alloy. The nominal Mo equivalent of the alloy is 11.43, and the β stability coefficient is 1.43.

[0013] The ultra-high-strength titanium alloy described in this embodiment can achieve a tensile strength of 1496 MPa, an elongation of 14.5%, and a reduction of area of ​​20.77% after solid solution and aging.

[0014] The ultra-high-strength titanium alloy described in this embodiment has a maximum tensile strength of 1829MPa a...

specific Embodiment approach 2

[0015] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the ultra-high strength titanium alloy consists of 4.0% to 5.0% of Al, 4.5% to 6% of Mo, 6% to 7% of V, 3% to 4% of Cr, 2% to 3% of Sn, 0.5% to 1% of Fe, the balance being Ti and unavoidable impurities. Others are the same as in the first embodiment.

[0016] The unavoidable impurities mentioned in this embodiment are O, H, N, C, Si, etc., wherein O≤0.1%, C≤0.08%, H≤0.0005%, N≤0.02%.

specific Embodiment approach 3

[0017] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the ultra-high strength titanium alloy consists of 4.0% Al, 5% Mo, 6% V, 3% Cr, 2% Sn, 0.5% Fe, the balance is Ti and unavoidable impurities. Others are the same as in the first or second embodiment.

[0018] The unavoidable impurities mentioned in this embodiment are O, H, N, C, Si, etc., wherein O≤0.1%, C≤0.08%, H≤0.0005%, N≤0.02%.

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Abstract

The invention relates to an ultrahigh-strength titanium alloy and a preparation method thereof, and aims to solve the problem that the existing high-strength titanium alloy can not have high strength and high ductility simultaneously. The ultrahigh-strength titanium alloy comprises Al, Mo, V, Cr, Sn, Fe and the balance of Ti and inevitable impurities in certain percentage by weight. The preparation method comprises the following steps: 1, weighing all the components; 2, preparing a monoblock electrode; 3, preparing a consumable electrode; 4, preparing a cast ingot; 5, preparing a forging blank; and 6, performing upsetting and finish-forging to obtain the ultrahigh-strength titanium alloy. According to the invention, after the ultrahigh-strength titanium alloy is subjected to solid solution and aging, the strength and ductility can be as follows: the tensile strength is up to 1496 MPa, the elongation percentage is 14.5%, and the percentage reduction in area is 20.77%. The invention can be used for preparation of the ultrahigh-strength titanium alloy.

Description

technical field [0001] The invention relates to an ultra-high-strength titanium alloy and a preparation method thereof. Background technique [0002] High-strength titanium alloy refers to a titanium alloy with room temperature strength greater than 1100MPa after heat treatment. It not only has high strength, but also has good plasticity, toughness, and good corrosion resistance. It is mainly used to replace high-strength steel as aerospace vehicles. Structural materials, as well as spring materials, have become one of the main research directions of titanium alloys in various countries, especially the United States and Russia developed earlier in this regard. In recent years, the application proportion of titanium alloys in the aerospace field has gradually increased, and high-strength titanium alloys have also been developed and applied rapidly. For example, Ti-1023 high-strength titanium alloys have been used successively on 737, 747 and 757 of Boeing Company of the Unite...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/02C22F1/18
Inventor 陈玉勇杜赵新肖树龙徐丽娟孔凡涛田竞
Owner HARBIN INST OF TECH
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