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Low-temperature rolling and heat treatment process of near-alpha type high-temperature titanium alloy

A high-temperature titanium alloy and low-temperature rolling technology, which is applied to the preparation of high-temperature titanium alloy sheets with micro-nano layered structure and the low-temperature rolling and heat treatment technology fields, can solve the problem of insufficient strength, poor creep resistance, and mesh basket structure creep. Insufficient strength and plasticity to achieve the effect of improving comprehensive mechanical properties and reducing stress concentration

Active Publication Date: 2022-06-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Among the four traditional microstructures of titanium alloys, the Widmanstatten microstructure has good high-temperature mechanical properties but poor plasticity, the equiaxed microstructure has good plasticity but insufficient strength, the bimodal microstructure has improved plastic strength but poor creep resistance, and the basket microstructure has poor creep resistance. Good strength but lack of plasticity

Method used

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  • Low-temperature rolling and heat treatment process of near-alpha type high-temperature titanium alloy
  • Low-temperature rolling and heat treatment process of near-alpha type high-temperature titanium alloy
  • Low-temperature rolling and heat treatment process of near-alpha type high-temperature titanium alloy

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Embodiment 1

[0032] In the near-α type high-temperature titanium alloy of this embodiment, the composition elements of the high-temperature titanium alloy are: Al: 6.1%, Sn: 3.0%, Zr: 5.1%, Mo: 0.5%, Nb: 1.1%, Ta: 0.9 %, Si: 0.4%, Er: 0.2%, and the remainder is Ti. A high-temperature titanium alloy ingot is obtained by a conventional casting method, and then the β / (α+β) phase transition point of the alloy is obtained by DSC (differential scanning calorimeter) test to be 1001°C. The first step is to open and forge through the β single-phase zone at 1150°C, and then finish forging at 980°C to obtain a bar with Widmanscher structure. The second step is to carry out double-stage spheroidization at 980°C / 1h-880°C / 2h to obtain the following figure 2 Isometric organization shown. In the third step, heat treatment at 990°C / 1h to obtain a dual-state structure with a primary α phase content of 13%, such as image 3 shown. In the fourth step, the two-state structure obtained in the previous step...

Embodiment 2

[0033] Example 2 (comparative example)

[0034] The near-α-type high-temperature titanium alloy of this example has the same alloy composition as that of Example 1. A high-temperature titanium alloy ingot was obtained by a conventional casting method, and then the β / (α+β) phase transition point of the alloy was obtained by DSC (differential scanning calorimeter) test to be 1001°C. In the first step, the 1150°C beta single-phase zone will be billet forged, followed by precision forging at 980°C to obtain a bar with Widmanners structure. The second step is to carry out double-stage spheroidization at 980°C / 1h-880°C / 2h to obtain the following figure 2 Isometric organization shown. In the third step, heat treatment at 990°C / 1h to obtain a dual-state structure with a primary α phase content of 13%, such as image 3 shown. In the fourth step, the two-state structure obtained in the previous step was kept at 880 ° C for 20 minutes, and the first hot rolling with a deformation am...

Embodiment 3

[0036]The near-α-type high-temperature titanium alloy of this example has the same alloy composition as that of Example 1. A high-temperature titanium alloy ingot is obtained by a conventional casting method, and then the β / (α+β) phase transition point of the alloy is obtained by DSC (differential scanning calorimeter) test to be 1001°C. The first step is to open and forge through the β single-phase zone at 1150 °C, and then finish forging at 980 °C to obtain a bar with Widmanners structure. The second step is to carry out double-stage spheroidization at 980°C / 1h-880°C / 2h to obtain the following figure 2 Isometric organization shown. In the third step, heat treatment at 990°C / 1h to obtain a dual-state structure with a primary α phase content of 13%, such as image 3 shown. In the fourth step, the dual-state structure obtained in the previous step was kept at 880 ° C for 20 minutes, and the first hot rolling was performed with a deformation amount of 10%; Hot rolling, cont...

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Abstract

The invention discloses a low-temperature rolling and heat treatment process of a near-alpha type high-temperature titanium alloy, and belongs to the technical field of titanium alloy preparation. The alloy comprises the following elements in percentage by weight: 6.1% of Al, 3.0% of Sn, 5.1% of Zr, 0.5% of Mo, 1.1% of Nb, 0.9% of Ta, 0.4% of Si, 0.2% of Er and the balance of Ti. The method comprises the following steps: firstly, carrying out two-stage spheroidizing treatment on a near-alpha type high-temperature titanium alloy forged in a beta-phase region, carrying out heat preservation at 10-15 DEG C below a beta / (alpha + beta) phase transformation point for 55-65 minutes, and then carrying out air cooling to obtain a double-state structure; then hot rolling with the total deformation of 60%-70% is carried out in an alpha single-phase region 10-20 DEG C below the alpha / (alpha + beta) phase transformation point; and finally, stabilization, inverse phase change and aging treatment are conducted in sequence. According to the method, the strength and the elongation of the high-temperature titanium alloy under room-temperature stretching are improved, and the high-temperature strength is improved under the condition that the high-temperature elongation is not reduced.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy preparation (the field of thermomechanical deformation controlled by deformation and phase change), and in particular relates to a high-temperature titanium alloy sheet for preparing a micro-nano layered structure and a low-temperature rolling and heat treatment process thereof. The high-temperature titanium alloy sheet with a similar structure has excellent comprehensive properties and will have important applications in the aerospace field. Background technique [0002] High-temperature titanium alloy is the key material for aero-engine to achieve weight reduction and increase thrust-to-weight ratio. It is mainly used in aero-engine compressor rotor blades and compressor discs. It reduces weight and improves structural efficiency. Good match of variable properties, thermal stability and fatigue properties. As an important field of titanium alloy research, high temperature titanium alloy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/183
Inventor 李伯龙胡继飞汤庆辉亓鹏
Owner BEIJING UNIV OF TECH
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