阅读说明：本技术 一种细晶ta15钛合金箔材的制备方法 (Preparation method of fine-grain TA15 titanium alloy foil ) 是由 陈志勇 王清江 朱绍祥 刘建荣 于 2021-06-27 设计创作，主要内容包括：一种细晶TA15钛合金箔材的制备方法,具体为：(1)将TA15钛合金铸锭在1000℃～1100℃加热后开坯锻造,获得板坯；(2)在900℃～960℃保温后进行轧制；(3)在β相变点之上30℃～50℃热处理后水淬冷却；(4)在900℃～940℃加热后进行轧制；(5)将所得坯料进行组焊,获得包覆叠轧包；(6)在900℃～940℃加热后,进行第四次轧制；(7)拆开叠轧包后,对坯料进行组焊,获得包覆叠轧包；(8)在920℃～940℃加热后,垂直于上次轧制方向进行轧制；(9)对坯料进行退火、蠕变校形、碱酸洗和砂光后,获得厚度为0.6mm的板材；(10)将板材剪切后进行多次冷轧,得到厚度为0.1mm～0.2mm的轧制态箔材；(11)进行真空退火热处理,获得厚度为0.1mm～0.2mm的成品箔材。(A preparation method of a fine-grain TA15 titanium alloy foil comprises the following steps: (1) heating a TA15 titanium alloy ingot at 1000-1100 ℃, cogging and forging to obtain a plate blank; (2) rolling after heat preservation at 900-960 ℃; (3) performing heat treatment at 30-50 ℃ above the beta transformation point, and then performing water quenching and cooling; (4) heating at 900-940 ℃ and then rolling; (5) assembling and welding the obtained blank to obtain a cladding and rolling package; (6) heating at 900-940 deg.c and rolling for the fourth time; (7) after the pack is disassembled, the blank is subjected to assembly welding to obtain a coated pack; (8) heating at 920-940 ℃, and then rolling in a direction perpendicular to the last rolling direction; (9) annealing, creep deformation correcting, alkali acid washing and sanding are carried out on the blank to obtain a plate with the thickness of 0.6 mm; (10) shearing the plate and then carrying out cold rolling for multiple times to obtain a rolled foil with the thickness of 0.1-0.2 mm; (11) and carrying out vacuum annealing heat treatment to obtain a finished foil with the thickness of 0.1-0.2 mm.)

1. A preparation method of a fine-grain TA15 titanium alloy foil is characterized by comprising the following steps:

step one, keeping the temperature of a titanium alloy ingot in a heating furnace at 1000-1100 ℃ for 200-240 min, and forging a plate blank on a forging machine, wherein the final forging temperature is not lower than 940 ℃ to obtain a plate blank for rolling;

secondly, preserving the temperature of the obtained plate blank in a heating furnace at 900-940 ℃ for 100-150 min, and cogging and rolling on a rolling mill to obtain a blank with the thickness of 10 +/-2 mm;

shearing the obtained blank, keeping the temperature of the cut blank in a heating furnace with the temperature of 30-50 ℃ above the beta transformation point of the TA15 titanium alloy for 60-90 min, and performing water quenching to the temperature below 100 ℃;

grinding the surface of the obtained blank, keeping the temperature of the ground blank in a heating furnace at 900-940 ℃ for 60-90 min, and rolling the ground blank to obtain a blank with the thickness of 4 +/-0.5 mm;

cutting the obtained blank into 4 pieces, and coating the surface of the blank with a steel plate after assembly welding to prepare a coated rolling package;

sixthly, keeping the temperature of the obtained coated rolling bag in a heating furnace at 900-940 ℃ for 60-90 min, and rolling to obtain a blank with the thickness of 1.5 +/-0.2 mm;

cutting the obtained blank into 4 pieces, combining and welding the 4 pieces, and coating the surface of the blank with a steel plate to prepare a coated rolling package;

step eight, keeping the obtained coated rolling packet in a heating furnace at the temperature of 920-940 ℃ for 80-100 min, and rolling the coated rolling packet to obtain a blank with the thickness of 0.65 +/-0.03 mm, wherein the temperature is perpendicular to the rolling direction in the step six;

step nine, annealing the obtained blank, creep deformation correcting, alkali acid washing and sanding to obtain a plate with the thickness of 0.6 mm;

cutting the obtained plate, then sending the plate into a six-roller reversible rolling mill for cold rolling for 5-7 times, and carrying out vacuum annealing heat treatment between each rolling pass in the intermediate process to finally obtain a rolled foil with the thickness of 0.1-0.2 mm;

step eleven, putting the rolled foil into a vacuum furnace for vacuum annealing heat treatment to obtain a finished foil with the thickness of 0.08-0.2 mm.

2. The method of making a fine crystalline TA15 titanium alloy foil according to claim 1 wherein: the size of the slab obtained in the step one is 120 +/-5 mm multiplied by 465mm multiplied by 515mm, and the total deformation of the slab in the thickness direction is not less than 80%.

3. The method of making a fine crystalline TA15 titanium alloy foil according to claim 1 wherein: and step two, cogging and rolling, wherein the number of rolling passes is one, and the deformation is not less than 90%.

4. The method of making a fine crystalline TA15 titanium alloy foil according to claim 1 wherein: in the rolling in the fourth step, the rolling process is once, and the deformation is not less than 50%.

5. The method of making a fine crystalline TA15 titanium alloy foil according to claim 1 wherein: in the fifth step or the seventh step, the thickness ratio of the steel plate to each titanium alloy blank in the clad-rolled package is 1-20: 1.

6. The method of making a fine crystalline TA15 titanium alloy foil according to claim 1 wherein: and step six, rolling, wherein the number of rolling passes is one, and the deformation is not less than 50%.

7. The method of making a fine crystalline TA15 titanium alloy foil according to claim 1 wherein: and step eight, rolling, wherein the number of rolling passes is one, and the deformation is not less than 40%.

8. The method of making a fine crystalline TA15 titanium alloy foil according to claim 1 wherein: annealing treatment in the ninth step, wherein the temperature is 800-850 ℃, the annealing time is 60-120 min, and furnace cooling is carried out; the thickness deviation of the prepared 0.6mm plate is not more than +/-0.05 mm.

9. The method of making a fine crystalline TA15 titanium alloy foil according to claim 1 wherein: cold rolling in the step ten, wherein the total deformation of each rolling process is 15-25 percent, and the vacuum annealing heat treatment is carried out, wherein the vacuum degree is 10^-3～10^-2Pa, heat treatment in the intermediate process, wherein the temperature is 780-830 ℃, and the heat preservation time is 30-90 min; step by stepStep eleven, carrying out vacuum annealing heat treatment on the finished foil in a vacuum degree of 10^-3～10^-2Pa, the heat treatment temperature is 750-850 ℃, the heat preservation time is 60-90 min, and the furnace cooling is carried out.

10. A fine crystalline TA15 titanium alloy foil prepared according to the method of claim 1 wherein: the average grain size of the fine-grain TA15 titanium alloy foil is 3-8 mu m, the room-temperature tensile strength is 950-1100 MPa, the elongation is more than or equal to 9%, the 500-DEG C tensile strength is 635-750 MPa, and the thickness deviation of the foil is not more than +/-0.015 mm.

Technical Field

The invention belongs to the technical field of titanium alloy material processing, and particularly relates to a preparation method of a fine-grain TA15 titanium alloy foil.

Background

The TA15 titanium alloy is a high-temperature titanium alloy with long-term use temperature of 500 ℃, and the main semi-finished product of the alloy is a plate material and is widely applied to high-temperature structural members in the fields of aviation and aerospace. In order to achieve the purposes of high temperature resistance and weight reduction, the foil of the high-temperature titanium alloy becomes a main titanium alloy semi-finished product with a honeycomb structure in aerospace planes and hypersonic aircrafts. Under the high-temperature use environment of 400-500 ℃, the strength and the plasticity of the TC4 titanium alloy foil can not meet the requirement of high temperature resistance.

In the invention patents with the publication numbers of CN103464461B and CN102941228B, a preparation method of a TB8 titanium alloy foil and a preparation method of a titanium alloy foil (TC4, TB8 and TB5) are respectively provided, the foils related in the patents are alpha + beta type two-phase alloys, the preparation blanks of the foils are all plates purchased in the market as raw materials, and the microstructures and the mechanical properties of the foils are not concerned. At present, the research and processing preparation work of TA15 titanium alloy foil is not carried out in China, so the research on the processing technology, the heat treatment technology and the like of the foil is needed to meet the requirement of the aerospace field on the TA15 titanium alloy foil.

The TA15 titanium alloy foil is mainly applied to high-temperature honeycomb structural members in aerospace hypersonic aircrafts, and not only is the foil required to have good forming performance, but also the foil is required to have higher room-temperature tensile strength (not less than 950 MPa). Because the rolling resistance of the TA15 titanium alloy is high, the tissue control, the thickness tolerance control and the like of the foil are all the problems which need to be considered in the preparation of the foil.

Disclosure of Invention

The invention provides a preparation method of a fine-grain TA15 titanium alloy foil, aiming at the blank of a TA15 titanium alloy fine-grain foil preparation technology, and aims to provide a fine-grain TA15 titanium alloy foil, wherein the average grain size of the foil is 3-8 mu m, the room-temperature tensile strength can reach 950-1100 MPa, the elongation is more than or equal to 9%, the 500-DEG C tensile strength is 635-750 MPa, and the thickness deviation of the foil is not more than +/-0.015 mm.

The technical scheme of the invention is as follows:

a preparation method of a fine-grain TA15 titanium alloy foil is characterized by comprising the following steps:

step one, keeping the temperature of a titanium alloy ingot in a heating furnace at 1000-1100 ℃ for 200-240 min, and forging a plate blank on a forging machine, wherein the final forging temperature is not lower than 940 ℃ to obtain a plate blank for rolling;

secondly, preserving the temperature of the obtained plate blank in a heating furnace at 900-940 ℃ for 100-150 min, and cogging and rolling on a rolling mill to obtain a blank with the thickness of 10 +/-2 mm;

shearing the obtained blank, keeping the temperature of the cut blank in a heating furnace with the temperature of 30-50 ℃ above the beta transformation point of the TA15 titanium alloy for 60-90 min, and performing water quenching to the temperature below 100 ℃;

grinding the surface of the obtained blank, keeping the temperature of the ground blank in a heating furnace at 900-940 ℃ for 60-90 min, and rolling the ground blank to obtain a blank with the thickness of 4 +/-0.5 mm;

cutting the obtained semi-finished plate blanks into 4 pieces, and coating the surfaces of the 4 pieces by using a steel plate after assembly welding to prepare a coated rolling package;

sixthly, keeping the temperature of the obtained coated rolling bag in a heating furnace at 900-940 ℃ for 60-90 min, and rolling to obtain a blank with the thickness of 1.5 +/-0.2 mm;

cutting the obtained blank into 4 pieces, combining and welding the 4 pieces, and coating the surface of the blank with a steel plate to prepare a coated rolling package;

step eight, keeping the obtained coated rolling packet in a heating furnace at the temperature of 920-940 ℃ for 80-100 min, and rolling the coated rolling packet to obtain a blank with the thickness of 0.65 +/-0.03 mm, wherein the temperature is perpendicular to the rolling direction in the step six;

step nine, annealing the obtained semi-finished plate, creep deformation and correction, alkali acid washing and sanding to obtain a plate with the thickness of 0.6 mm;

cutting the obtained plate, then sending the plate into a six-roller reversible rolling mill for cold rolling for 5-7 times, and carrying out vacuum annealing heat treatment between each rolling pass in the intermediate process to finally obtain a rolled foil with the thickness of 0.1-0.2 mm;

step eleven, putting the rolled foil into a vacuum furnace for vacuum annealing heat treatment to obtain a finished foil with the thickness of 0.1-0.2 mm.

As a preferred technical scheme:

the size of the slab obtained in the step one is 120 +/-5 mm multiplied by 465mm multiplied by 515mm, and the total deformation of the slab in the thickness direction is not less than 80%.

And step two, cogging and rolling, wherein the number of rolling passes is one, and the deformation is not less than 90%.

In the rolling in the fourth step, the rolling process is once, and the deformation is not less than 50%.

In the fifth step or the seventh step, the thickness ratio of the steel plate in the clad-rolled package to each titanium alloy plate is 1-20: 1.

And step six, rolling, wherein the number of rolling passes is one, and the deformation is not less than 50%.

And step eight, rolling, wherein the number of rolling passes is one, and the deformation is not less than 40%.

Annealing treatment in the ninth step, wherein the temperature is 800-850 ℃, the annealing time is 60-120 min, and furnace cooling is carried out; the thickness deviation of the prepared 0.6mm plate is not more than +/-0.05 mm.

Cold rolling in the step ten, wherein the total deformation of each rolling process is 15-25 percent, and the vacuum annealing heat treatment is carried out, wherein the vacuum degree is 10^-3～10^-2Pa, heat treatment in the intermediate process, wherein the temperature is 780-830 ℃, and the heat preservation time is 30-90 min;

step eleven, carrying out vacuum annealing heat treatment on the finished foil material, wherein the vacuum degree is 10^-3～10^-2Pa, the heat treatment temperature is 750-850 ℃, the heat preservation time is 60-90 min, and the furnace cooling is carried out.

Compared with the prior art, the invention has the following advantages:

1. the invention covers the full-flow preparation process and method of plate blank preparation, plate rolling, foil preparation and foil heat treatment in TA15 titanium alloy foil preparation, and can effectively control the microstructure and mechanical property of the foil.

2. According to the invention, a beta phase region quenching process is adopted in the plate blank preparation process to form needle-like disordered martensite alpha' phase laths and a small amount of beta phase, so that the phase change texture of the final product foil can be effectively weakened, and the grain size of the foil is refined.

3. According to the invention, the 0.6mm plate undergoes two times of coating and one time of reversing rolling, so that the rolling texture of the final foil can be effectively weakened.

4. The fine-grain TA15 titanium alloy foil prepared by the method has the average grain size of 3-8 mu m, the room-temperature tensile strength of 950-1100 MPa, the elongation of more than or equal to 9 percent, the 500-DEG C tensile strength of 635-750 MPa, and the thickness deviation of the foil is not more than +/-0.015 mm.

Detailed Description

The present invention will be described in further detail with reference to examples, in which the degree of vacuum of the vacuum annealing heat treatment of the present invention is 10, unless otherwise specified^-3～10^-2Pa。

Example 1

Preparation of TA15 titanium alloy foil with thickness of 0.1mm

Smelting a TA15 titanium alloy cast ingot with a target component of Ti-6.5Al-1.4Mo-1.4V-2.0Zr-0.05O, preserving the temperature of the titanium alloy cast ingot in a heating furnace at 1100 ℃ for 200min, forging a plate blank on a forging machine, wherein the finish forging temperature is not lower than 980 ℃, obtaining a plate blank for rolling, the size of the obtained plate blank is 120mm multiplied by 465mm multiplied by 515mm, and the total deformation in the thickness direction of the plate blank is not less than 80%;

step two, keeping the temperature of the obtained plate blank in a heating furnace at 960 ℃ for 100min, and cogging and rolling on a rolling mill to obtain a blank with the thickness of 10mm, wherein the number of rolling passes is one, and the deformation is 92%;

shearing the obtained blank, keeping the temperature of the cut blank in a heating furnace at the temperature of 30 ℃ above the beta transformation point for 60min, and performing water quenching to the temperature below 100 ℃;

grinding the surface of the obtained blank, keeping the temperature of the ground blank in a heating furnace at 940 ℃ for 90min, and rolling the ground blank to obtain a blank with the thickness of 4mm, wherein the number of rolling passes is one, and the deformation is 60%;

cutting the obtained blanks into 4 pieces, combining and welding the 4 pieces, and coating the surfaces of the 4 pieces by using a steel plate to prepare a coated rolling package, wherein the thickness ratio of the steel plate to each titanium alloy blank is 15: 1;

step six, keeping the temperature of the obtained coated rolling bag in a heating furnace at 940 ℃ for 90min, and rolling to obtain a blank with the thickness of 1.5mm, wherein the number of rolling passes is one, and the deformation is 63%;

seventhly, cutting the obtained 1.5mm blanks into 4 pieces, combining and welding the 4 pieces, and then coating the surfaces of the 4 pieces by using a steel plate to prepare a coated rolling package, wherein the thickness ratio of the steel plate to each titanium alloy blank is 15: 1;

step eight, keeping the obtained coated rolling package in a heating furnace at the temperature of 940 ℃ for 100min, and rolling the coated rolling package in a direction perpendicular to the rolling direction in the step six to obtain a blank with the thickness of 0.65mm, wherein the number of rolling passes is one, and the total deformation is 57%;

step nine, carrying out furnace-cooling annealing heat treatment on the obtained blank at 800 ℃ for 120min, and carrying out creep deformation correction, alkali acid washing and sanding to obtain a plate with the thickness of 0.6 mm;

cutting the obtained 0.6mm plate, and then sending the plate into a six-roller reversible rolling mill for cold rolling for 6 times, wherein the total deformation of each rolling process is 25%, and the vacuum annealing heat treatment at 830 ℃ for 60min is carried out after each rolling in the intermediate process, so as to finally obtain the rolled foil with the thickness of 0.1 mm;

step eleven, putting the rolled foil into a vacuum furnace for vacuum annealing heat treatment at 800 ℃ for 60min to obtain a finished foil with the thickness of 0.1 mm.

The TA15 titanium alloy foil with a thickness of 0.1mm prepared in this example had an average grain size of 3 μm, room temperature tensile strength: 1000MPa, elongation of 10 percent, tensile strength of 650MPa at 500 ℃, and thickness deviation of the foil material is +/-0.012 mm.

Example 2

Preparation of TA15 titanium alloy foil with thickness of 0.2mm

Smelting a TA15 titanium alloy cast ingot with a target component of Ti-6.5Al-1.2Mo-1.2V-2.0Zr-0.1O, preserving the temperature of the titanium alloy cast ingot in a heating furnace at 1050 ℃ for 240min, forging a slab on a forging machine, wherein the finish forging temperature is not lower than 980 ℃, obtaining a rolling slab, the size of the obtained slab is 115mm multiplied by 465mm multiplied by 515mm, and the total deformation in the thickness direction of the slab is not less than 80%;

step two, keeping the obtained plate blank at the temperature of 900 ℃ in a heating furnace for 150min, and cogging and rolling on a rolling mill to obtain a blank with the thickness of 12mm, wherein the number of rolling passes is one, and the deformation is 90%;

shearing the obtained blank, keeping the temperature of the cut blank in a heating furnace at 50 ℃ above the beta transformation point for 90min, and performing water quenching to the temperature below 100 ℃;

grinding the surface of the obtained blank, keeping the temperature of the ground blank in a heating furnace at 900 ℃ for 60min, and rolling the ground blank to obtain a blank with the thickness of 4.5mm, wherein the number of rolling passes is one, and the deformation is 63%;

cutting the obtained blanks into 4 pieces, combining and welding the 4 pieces, and coating the surfaces of the 4 pieces by using a steel plate to prepare a coated rolling package, wherein the thickness ratio of the steel plate to each titanium alloy blank is 10: 1;

step six, keeping the temperature of the obtained coated rolling bag in a heating furnace at 900 ℃ for 60min, and rolling to obtain a blank with the thickness of 1.7mm, wherein the number of rolling passes is one, and the deformation is 62%;

cutting the obtained blanks into 4 pieces, combining and welding the 4 pieces, and coating the surfaces of the 4 pieces by using a steel plate to prepare a coated rolling package, wherein the thickness ratio of the steel plate to each titanium alloy blank is 10: 1;

step eight, keeping the obtained coated rolling package in a heating furnace at the temperature of 920 ℃ for 80min, and rolling the coated rolling package in a direction perpendicular to the rolling direction in the step six to obtain a blank with the thickness of 0.68mm, wherein the number of rolling passes is one, and the total deformation is 60%;

and step nine, annealing the obtained blank at 850 ℃ for 60min in a furnace cooling mode, creep deformation correction, alkali acid washing and sanding to obtain a plate with the thickness of 0.6 mm.

Cutting the obtained plate, and then sending the plate into a six-roller reversible rolling mill for cold rolling for 6 times, wherein the total deformation of each rolling process is 15-20%, and after each rolling in the intermediate process, carrying out vacuum annealing heat treatment at 780 ℃ for 90min to finally obtain a rolled foil with the thickness of 0.2 mm;

step eleven, putting the rolled foil into a vacuum furnace for vacuum annealing heat treatment at 750 ℃ for 60min to obtain a finished foil with the thickness of 0.2 mm.

The TA15 titanium alloy foil with a thickness of 0.2mm prepared in this example had an average grain size of 5 μm, room temperature tensile strength: 1050MPa, elongation of 10 percent, tensile strength of 710MPa at 500 ℃ and thickness deviation of +/-0.015 mm of the foil.

Example 3

Preparation of TA15 titanium alloy foil with thickness of 0.15mm

Smelting a TA15 titanium alloy cast ingot with a target component of Ti-6.5Al-1.6Mo-2.2V-2.1Zr-0.06O, preserving the temperature of the titanium alloy cast ingot in a heating furnace at 1050 ℃ for 220min, forging a slab on a forging machine, wherein the finish forging temperature is not lower than 980 ℃, obtaining a rolling slab, the size of the obtained slab is 125mm multiplied by 465mm multiplied by 515mm, and the total deformation in the thickness direction of the slab is not less than 80%;

step two, keeping the temperature of the obtained plate blank in a heating furnace at the temperature of 920 ℃ for 120min, and performing cogging rolling on a rolling mill to obtain a blank with the thickness of 8mm, wherein the number of rolling passes is one, and the deformation is 93%;

shearing the obtained blank, keeping the temperature of the cut blank in a heating furnace at 40 ℃ above the beta transformation point for 80min, and performing water quenching to the temperature below 100 ℃;

grinding the surface of the obtained blank, keeping the temperature of the ground blank in a heating furnace at the temperature of 920 ℃ for 80min, and rolling the ground blank to obtain a blank with the thickness of 3.5mm, wherein the number of rolling passes is one, and the deformation is 56%;

cutting the obtained blanks into 4 pieces, combining and welding the 4 pieces, and coating the surfaces of the 4 pieces by using a steel plate to prepare a coated rolling package, wherein the thickness ratio of the steel plate to each titanium alloy blank is 5: 1;

step six, keeping the temperature of the obtained coated rolling bag in a heating furnace at 920 ℃ for 80min, and rolling to obtain a semi-finished blank with the thickness of 1.3mm, wherein the number of rolling passes is one, and the deformation is 63%;

cutting the obtained blanks into 4 pieces, combining and welding the 4 pieces, and coating the surfaces of the 4 pieces by using a steel plate to prepare a coated rolling package, wherein the thickness ratio of the steel plate to each titanium alloy blank is 5: 1;

step eight, keeping the temperature of the obtained coated rolling package in a heating furnace at 930 ℃ for 90min, and rolling the coated rolling package in a direction perpendicular to the rolling direction in the step six to obtain a blank with the thickness of 0.62mm, wherein the number of rolling passes is one, and the deformation is 52%;

and step nine, annealing the obtained blank at 820 ℃ for 60min in a furnace cooling mode, creep deformation correction, alkali acid washing and sanding to obtain a plate with the thickness of 0.6 mm.

Cutting the obtained plate, and then sending the cut plate into a six-roller reversible rolling mill for cold rolling for 6 times, wherein the total deformation of each rolling process is 20-25%, and the vacuum annealing heat treatment at 700 ℃ for 90min must be carried out between each rolling process in the intermediate process, so as to finally obtain the rolled foil with the thickness of 0.15 mm;

step eleven, putting the rolled foil into a vacuum furnace for vacuum annealing heat treatment at 850 ℃ for 90min to obtain a finished foil with the thickness of 0.15 mm.

The TA15 titanium alloy foil with a thickness of 0.15mm prepared in this example had an average grain size of 2.5 μm, room temperature tensile strength: 980MPa, the elongation rate is 13.0 percent, and the 500 ℃ tensile strength is 680MPa, and the thickness deviation of the foil is +/-0.01 mm.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.