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High-strength plastic titanium alloy suitable for cold deformation processing and preparation method thereof

A cold deformation, titanium alloy technology, applied in the field of titanium alloy materials, can solve the problems of difficult cold deformation processing, large material loss, and high production cost, and achieves the problem of overcoming large deformation cold working, excellent strong plastic matching, and excellent cold deformation ability. Effect

Active Publication Date: 2022-06-24
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, α+β two-phase titanium alloy is the most used type of titanium alloy, but the strength of this type of alloy is usually lower than 1000MPa, such as TC4, TA15, etc., and it is difficult to process cold deformation
Although metastable β titanium alloys can obtain higher strength after solution aging heat treatment, such as TB5, TB6, Ti-15-3, Ti-5553, β21s, etc., these alloys have low plasticity when the strength is greater than 1250MPa. Problem, taking Ti-5553 (Ti-5Al-5Mo-5V-3Cr, US patent) as an example, when its tensile strength is 1500MPa, it has almost no plasticity
In addition, the commonly used metastable β high-strength titanium alloys are added with high content of expensive alloying elements such as V, Nb, Zr, and most of the alloys need to be plastically processed by hot deformation, which has long process, large material loss, and high production cost. High, large-scale industrial application is limited
At the same time, compared with the α+β two-phase titanium alloy, the single-phase metastable β titanium alloy has the problem of low yield strength, which makes it difficult to meet the needs of some industrial applications.

Method used

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  • High-strength plastic titanium alloy suitable for cold deformation processing and preparation method thereof
  • High-strength plastic titanium alloy suitable for cold deformation processing and preparation method thereof
  • High-strength plastic titanium alloy suitable for cold deformation processing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The high-strength and high-plastic titanium alloy in this embodiment is composed of the following components by weight: Mo 4.23%, Cr 2.90%, Fe 0.80%, O<0.18%, and the balance is Ti and inevitable impurities. In this example, through reasonable component design, only five elements including Ti, Mo, Cr, Fe and O are included, and the addition of α-stabilizing elements such as Al and Sn is avoided. The content of α phase and the distribution of alloying elements in α and β phases obtain α+β two-phase titanium alloy, which can reduce the cost and improve the plastic workability of the alloy, so that the alloy has excellent strong-plastic matching.

[0046] The preparation method of the high-strength and high-plastic titanium alloy in this embodiment comprises the following steps:

[0047] S1 prefabricated electrode: 1.32kg Ti-32Mo master alloy, 0.3kg chromium flakes and 0.09kg iron particles are evenly mixed, and the mixture is placed in the middle of 8.29kg titanium sponge...

Embodiment 2

[0055] The ingot obtained in step S2 in Example 1 was opened and forged into a square billet, then placed in a resistance furnace and heated to 740° C. for 1 hour, and then multi-pass rolling was performed to remove the surface oxide layer and clean it to obtain a titanium alloy rolled. plate; in the multi-pass rolling process, after each pass, the titanium alloy forging billet is placed in a resistance furnace and heated to 740 ° C and kept for 10 minutes; the total deformation of the multi-pass rolling is 80 %.

[0056] The as-rolled alloy was solution-treated at 750°C / 30min, and then water-cooled to room temperature. The obtained solid-solution microstructure contained about 10% equiaxed α phase, with a tensile strength of 1168MPa and an elongation of 36.2%. .

[0057] The solid-solution alloy was artificially aged at 480 °C for 4 hours, and the aging microstructure obtained was a dual-state microstructure, such as image 3 As shown, it contains a primary equiaxed α phase...

Embodiment 3

[0059] The present embodiment is a preparation method of a cold-rolled sheet, and the specific steps are:

[0060] S1: The solid solution forging billet obtained in step S4 of Example 1 is machined into a slab.

[0061] S2: The slab in step S1 is kept at 650°C for 30 minutes to adjust the content and element distribution of α and β phases in the structure, and then water-cooled and quenched to room temperature; rolling is directly heat-treated at 650°C in the forged state.

[0062] S3: removing the oxide scale from the slab in step S2 and cleaning, and performing multiple passes of cold rolling deformation at room temperature, the total deformation is greater than 85%, and a plate with a thickness of 1.5mm is obtained; Figure 5 a is the appearance of the cold-rolled sheet, and it can be seen that the surface quality is good.

[0063] S4: Aged the S3 cold-rolled sheet at 460° C. for 1 h, the tensile strength is 1460 MPa, and the elongation is 8.3%.

[0064] S5: The S3 cold-r...

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Abstract

The invention discloses a high-strength and high-plasticity titanium alloy suitable for cold deformation processing and a preparation method thereof, and the high-strength and high-plasticity titanium alloy comprises the following components in percentage by mass: 3.5-4.5% of Mo, 2.5-3.5% of Cr, 0.7-1.5% of Fe, and Olt. 0.35%, and the balance being Ti; the preparation method comprises the following steps: preparing a titanium alloy ingot through raw material proportioning and vacuum melting; carrying out hot processing at the temperature of 1150-720 DEG C; and carrying out solution treatment at 790-730 DEG C to obtain a finished product of the high-strength plastic titanium alloy, or further carrying out aging treatment at 430-530 DEG C to obtain the finished product of the high-strength plastic titanium alloy, or carrying out cold rolling and aging heat treatment after heat treatment to obtain the finished product of the high-strength plastic titanium alloy. Strong beta stable elements of Mo, Cr and Fe are added, no alpha stable element is added to improve the plastic deformation capacity of an alpha phase at the room temperature and the high temperature, the content and element distribution of the alpha phase and the beta phase are regulated and controlled through thermomechanical treatment, the cold deformation machining performance and strength and plasticity matching of the titanium alloy are improved, and the mechanical property of the titanium alloy is improved. The alloy has the characteristics of low cost, easiness in cold processing and excellent strength and plasticity matching.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy materials, in particular to a high-strength plastic titanium alloy suitable for cold deformation processing and a preparation method thereof. Background technique [0002] Titanium alloys have the advantages of low density, high specific strength, corrosion resistance and non-magnetic properties. As structural materials, they are widely used in aerospace, petrochemical, marine engineering and weaponry and other fields. At present, α+β two-phase titanium alloy is the most widely used type of titanium alloy, but the strength of this type of alloy is usually lower than 1000MPa, such as TC4, TA15, etc., and cold deformation processing is difficult. Although metastable β-titanium alloys can obtain high strength after solution aging heat treatment, such as TB5, TB6, Ti-15-3, Ti-5553, β21s, etc., these alloys have low plasticity when the strength is greater than 1250MPa. The problem, taking Ti-55...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/00C22F1/18B21J5/00
CPCC22C14/00C22F1/183C22F1/002B21J5/002
Inventor 肖文龙任磊付雨马朝利
Owner BEIHANG UNIV
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