阅读说明：本技术 一种高温钛合金板材及其制备方法和应用 (High-temperature titanium alloy plate and preparation method and application thereof ) 是由 葛鹏 王瑞琴 廖强 侯鹏 刘宇 席锦会 于 2019-11-22 设计创作，主要内容包括：本发明涉及钛合金材料制备技术领域,具体涉及一种高温钛合金板材及其制备方法和应用。本发明提供的高温钛合金板材的制备方法,包括以下步骤：(1)将钛合金板坯依次进行第一加热处理和第一轧制,得到第一半成品板坯；所述第一轧制为单向轧制；(2)将步骤(1)所述第一半成品板坯进行切割,得到第二半成品板坯；(3)将步骤(2)所述第二半成品板坯依次进行第二加热处理第二轧制,得到第三半成品板坯；所述第二轧制为单向轧制；(4)将步骤(3)所述第三半成品板坯进行热处理,得到高温钛合金板材。本发明改变了高温钛合金叶片用锻坯的产品型式,用板材替代传统的棒材,具有较高的室温力学性能、高温力学性能和持久性能。(The invention relates to the technical field of titanium alloy material preparation, in particular to a high-temperature titanium alloy plate and a preparation method and application thereof. The preparation method of the high-temperature titanium alloy plate provided by the invention comprises the following steps: (1) sequentially carrying out first heating treatment and first rolling on the titanium alloy plate blank to obtain a first semi-finished plate blank; the first rolling is unidirectional rolling; (2) cutting the first semi-finished plate blank in the step (1) to obtain a second semi-finished plate blank; (3) sequentially carrying out second heating treatment and second rolling on the second semi-finished plate blanks in the step (2) to obtain third semi-finished plate blanks; the second rolling is unidirectional rolling; (4) and (4) carrying out heat treatment on the third semi-finished plate blank obtained in the step (3) to obtain the high-temperature titanium alloy plate. The invention changes the product type of the forging stock for the high-temperature titanium alloy blade, uses the sheet material to replace the traditional bar material, and has higher room-temperature mechanical property, high-temperature mechanical property and durability.)

1. The preparation method of the high-temperature titanium alloy plate is characterized by comprising the following steps of:

(1) sequentially carrying out first heating treatment and first rolling on the titanium alloy plate blank to obtain a first semi-finished plate blank; the first rolling is unidirectional rolling;

(2) cutting the first semi-finished plate blank in the step (1) to obtain a second semi-finished plate blank;

(3) sequentially carrying out second heating treatment and second rolling on the second semi-finished plate blank in the step (2) to obtain a third semi-finished plate blank; the second rolling is unidirectional rolling;

(4) and (4) carrying out heat treatment on the third semi-finished plate blank obtained in the step (3) to obtain the high-temperature titanium alloy plate.

2. The preparation method according to claim 1, wherein the temperature of the first heating treatment in the step (1) is 10-20 ℃ below the transformation point of the titanium alloy slab; time t of the first heat treatment₁(H +30) min, wherein H is the thickness of the titanium alloy slab, and H has units of mm;

the total deformation amount of the first rolling is 60-70%.

3. The method of claim 1, wherein the cutting of step (2) is performed along the length of the first semi-finished slab.

4. The preparation method according to claim 1, wherein the temperature of the second heating treatment in the step (3) is 10-20 ℃ below the transformation point of the titanium alloy slab; time t of the second heat treatment₂(H +20) min, wherein H is the titanium alloy slabIn mm, H;

and the total deformation amount of the second rolling is 50-60%.

5. The production method according to claim 1 or 4, characterized in that the rolling direction of the second rolling is the same as the rolling direction of the first rolling.

6. The manufacturing method according to claim 1, wherein after the second rolling in the step (3) is finished, the obtained slab is subjected to a furnace returning heat treatment and water cooling in sequence to obtain a third semi-finished slab; the temperature of the furnace returning heat treatment is the same as that of the second heat treatment; time t of the heat treatment of the melting furnace₃(H +10) min, where H is the thickness of the titanium alloy slab and H is in mm.

7. The method according to claim 1, wherein the heat treatment in step (4) is carried out at a temperature of 500 to 750 ℃ for 2 to 6 hours.

8. The production method according to claim 7, wherein after the heat treatment in the step (4) is completed, the third semi-finished plate blank is cut in the width direction thereof to obtain the high-temperature titanium alloy plate.

9. The high-temperature titanium alloy plate prepared by the preparation method of any one of claims 1 to 8, wherein the structure of the high-temperature titanium alloy plate is a lamellar beta-transformation structure and 10-15% of primary alpha phase.

10. Use of the high temperature titanium alloy sheet according to claim 9 for the manufacture of a high temperature titanium alloy blade.

Technical Field

The invention relates to the technical field of titanium alloy material preparation, in particular to a high-temperature titanium alloy plate and a preparation method and application thereof.

Background

In recent years, with the development of the aerospace industry, high thrust-weight ratio is the trend of the development of aero-engines, and the development of the high thrust-weight ratio aero-engines is closely related to the mass application of high-temperature titanium alloy. The high-temperature titanium alloy is mainly a near-alpha type titanium alloy, has good creep deformation, durability and welding performance, is suitable for being used in a high-temperature environment, and is used for manufacturing various parts such as blades, blisks, drums and the like of aircraft engines. The blade is a key part of an aeroengine, and the failure of the blade is mainly caused by damage caused by creep and high-low cycle fatigue, so that the creep performance or fatigue performance of the material for the blade is improved, and the service life of the blade is prolonged.

At present, a forging stock for a high-temperature titanium alloy blade is a hot-rolled bar, the performance of the hot-rolled titanium alloy bar is influenced by the texture besides the microstructure (the structure form, the phase size, the volume fraction of alpha phase and beta phase), and the texture formed in the bar rolling process of the near-alpha type high-temperature titanium alloy mainly containing the close-packed hexagonal alpha phase has more obvious influence on the performance of the bar. The deformation mode of the hot-rolled bar is mainly axial deformation, and the texture generated by the deformation mode is not beneficial to improving the creep property of the blade. Although the processing mode of the blade is to carry out die forging on a hot rolled bar in the radial direction, the texture formed by the radial deformation is beneficial to improving the creep property of the blade, but the blade only carries out small deformation in the radial direction of the bar, so the effect of improving the creep property of the blade is not great, the contradiction between the high-temperature creep property and the thermal stability of the high-temperature titanium alloy at the present stage is difficult to coordinate, the Al-Sn-Zr-Mo-Si alloy system reaches the limit, the potential of greatly improving the high-temperature property of the alloy from the alloying angle is very small, and the harsh requirements of the rapid development of the aviation and aerospace industries in China on the high-temperature titanium alloy are difficult to meet.

Disclosure of Invention

The invention aims to provide a preparation method of a high-temperature titanium alloy plate, the titanium alloy plate is adopted to replace a traditional forged blank hot-rolled bar for a blade, the type of the forged blank for the blade is changed, the residual deformation generated during the creep deformation of the forged blank for the blade is greatly reduced, the high-temperature mechanical property and the high-temperature creep property are improved, and the service life of the blade is prolonged.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a preparation method of a high-temperature titanium alloy plate, which comprises the following steps:

(1) sequentially carrying out first heating treatment and first rolling on the titanium alloy plate blank to obtain a first semi-finished plate blank; the first rolling is unidirectional rolling;

(2) cutting the first semi-finished plate blank in the step (1) to obtain a second semi-finished plate blank;

(3) sequentially carrying out second heating treatment and second rolling on the second semi-finished plate blank in the step (2) to obtain a third semi-finished plate blank; the second rolling is unidirectional rolling;

(4) and (4) carrying out heat treatment on the third semi-finished plate blank obtained in the step (3) to obtain the high-temperature titanium alloy plate.

Preferably, the temperature of the first heating treatment in the step (1) is 10-20 ℃ below the transformation point of the titanium alloy plate blank; time t of the first heat treatment₁(H +30) min, wherein H is the thickness of the titanium alloy slab, and H has units of mm;

the total deformation amount of the first rolling is 60-70%.

Preferably, the cutting direction in the step (2) is cutting along the length direction of the first semi-finished blank.

Preferably, the temperature of the second heating treatment in the step (3) is 10-20 ℃ below the transformation point of the titanium alloy plate blank; time t of the second heat treatment₂(H +20) min, wherein H is the thickness of the titanium alloy slab, and H has units of mm;

and the total deformation amount of the second rolling is 50-60%.

Preferably, the rolling direction of the second rolling is the same as the rolling direction of the first rolling.

Preferably, after the second rolling in the step (3) is finished, performing furnace returning heat treatment and water cooling on the obtained plate blank in sequence to obtain a third semi-finished plate blank; the temperature of the furnace returning heat treatment is the same as that of the second heat treatment; time t of the heat treatment of the melting furnace₃(H +10) min, where H is the thickness of the titanium alloy slab and H is in mm.

Preferably, the temperature of the heat treatment in the step (4) is 500-750 ℃ and the time is 2-6 h.

Preferably, after the heat treatment in the step (4) is finished, cutting is performed along the width direction of the third semi-finished plate blank to obtain the high-temperature titanium alloy plate.

The invention provides a high-temperature titanium alloy plate prepared by the preparation method, and the structure of the high-temperature titanium alloy plate is a thin-sheet layered beta transformation structure and 10-15% of primary alpha phase.

The invention also provides application of the high-temperature titanium alloy plate in the technical scheme in preparation of the high-temperature titanium alloy blade.

The invention provides a preparation method of a high-temperature titanium alloy plate, which comprises the following steps: (1) sequentially carrying out first heating treatment and first rolling on the titanium alloy plate blank to obtain a first semi-finished plate blank; the first rolling is unidirectional rolling; (2) cutting the first semi-finished plate blank in the step (1) to obtain a second semi-finished plate blank; (3) sequentially carrying out second heating treatment and second rolling on the second semi-finished plate blank in the step (2) to obtain a third semi-finished plate blank; the second rolling is unidirectional rolling; (4) and (4) carrying out heat treatment on the third semi-finished plate blank obtained in the step (3) to obtain the high-temperature titanium alloy plate. The invention adopts unidirectional rolling, is beneficial to the control of the size precision and the plate shape of the plate, and improves the yield of the high-temperature titanium alloy plate; the high-temperature titanium alloy plate obtained by the preparation method provided by the invention has excellent room-temperature mechanical property, high-temperature mechanical property and durability in the direction (namely transverse direction) vertical to the rolling direction.

The embodiment result shows that the TC11 high-temperature titanium alloy plate for the blade forging stock has the transverse 500 ℃ tensile strength of more than 780MPa, the yield strength of more than 600MPa, the elongation after fracture of more than 15%, the reduction of area of more than 30%, the transverse endurance life of the plate is more than 55h under the condition of 500 ℃/640MPa, and the creep plastic elongation of less than 0.10% under the condition of 500 ℃/300MPa/50 h; according to the Ti6242S high-temperature titanium alloy plate for the blade forging stock, the tensile strength of the plate at 525 ℃ in the transverse direction is more than 635MPa, the yield strength is more than 565MPa, the elongation after fracture is more than 20%, the reduction of area is more than 35%, the transverse endurance life of the plate is more than 75h under the condition of 525 ℃/480MPa, and the creep plastic elongation is less than 0.10% under the condition of 510 ℃/240MPa/35 h; according to the BT25 high-temperature titanium alloy plate for the blade forging stock, the transverse 550-DEG C tensile strength of the plate is more than 830MPa, the yield strength is more than 660MPa, the elongation after fracture is more than 15%, the reduction of area is more than 30%, the transverse endurance life of the plate is more than 80h under the condition of 550 ℃/441MPa, and the creep plastic elongation is less than 0.10% under the condition of 550 ℃/430MPa/100 h; the Ti1100 high-temperature titanium alloy plate for the blade forging stock, which is prepared by the invention, has the transverse 600 ℃ tensile strength of more than 680MPa, the yield strength of more than 570MPa, the elongation after fracture of more than 13 percent, the reduction of area of more than 28 percent, the transverse lasting life of the plate is more than 175h under the condition of 600 ℃/200MPa, and the creep plastic elongation of less than 0.10 percent under the condition of 600 ℃/300MPa/100 h; the IMI834 high-temperature titanium alloy plate for the blade forging stock, which is prepared by the invention, has the transverse 600 ℃ tensile strength of more than 700MPa, the yield strength of more than 580MPa, the elongation after fracture of more than 15 percent, the reduction of area of more than 30 percent, the transverse lasting life of the plate is more than 15 hours under the condition of 600 ℃/450MPa, and the creep plastic elongation of less than 0.10 percent under the condition of 600 ℃/150MPa/100 hours. Therefore, the high-temperature titanium alloy plate of the blade forging stock prepared by the invention can meet the industrial requirements, solves the problem of difficult production of the high-temperature titanium alloy plate in China, and can meet the severe requirements of aviation and aerospace industries in China on the high-temperature titanium alloy.

The invention also provides application of the high-temperature titanium alloy plate in the technical scheme in preparation of the high-temperature titanium alloy blade. The invention changes the product type of the forging stock for the high-temperature titanium alloy blade, and uses the sheet material to replace the traditional bar material; compared with a bar processing mode, the processing mode of the high-temperature titanium alloy plate is to perform large deformation rolling on the titanium alloy plate blank along the length direction of the plate blank in a single direction, so that a strong texture which is beneficial to improving the transverse creep and the endurance performance of the plate is formed, the residual deformation generated during the creep of the blade forging stock can be greatly reduced to 1/4-1/2 of the bar, and the endurance life is prolonged by 30-50%.