CN114717496A - Boeing hot rolling combined pulse current annealing method for titanium alloy plate - Google Patents
Boeing hot rolling combined pulse current annealing method for titanium alloy plate Download PDFInfo
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000000137 annealing Methods 0.000 title claims abstract description 30
- 238000005098 hot rolling Methods 0.000 title claims description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims description 31
- 238000004321 preservation Methods 0.000 claims description 21
- 239000000956 alloy Substances 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 10
- 230000000171 quenching effect Effects 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 4
- 239000005457 ice water Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 8
- 239000013078 crystal Substances 0.000 abstract description 5
- 239000007769 metal material Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000001953 recrystallisation Methods 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 9
- 238000002441 X-ray diffraction Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/38—Heating by cathodic discharges
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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Abstract
The invention discloses a corrugated roller and flat roller rolling combined pulse current annealing method, belongs to the technical field of new materials, and aims to solve the problems that the plasticity and toughness of titanium alloy prepared by the existing process cannot meet the use requirement and the existing thermal mechanical processing process has complex steps and high cost. The invention applies step load to the titanium alloy plate by rolling of the corrugated roller, obtains an ultrafine crystal and coarse crystal mixed heterogeneous structure in the titanium alloy plate through the difference of deformation at wave crests and wave troughs, and promotes the recovery recrystallization in the microstructure of the titanium alloy plate by using the electrical effect of pulse current through pulse current annealing, thereby preparing the titanium alloy plate with high strength and good plasticity and toughness. The titanium alloy sheet material prepared by the invention is a metal material with high strength and good plasticity.
Description
Technical Field
The invention belongs to the technical field of new materials, and particularly relates to a wave-flat hot rolling combined pulse current annealing method for a titanium alloy plate.
Background
Titanium alloys have high specific strength and excellent corrosion resistance, and have a low density, only about half that of steel and nickel-based superalloys. The titanium alloy with the excellent properties can be widely applied to industries such as aerospace, chemical engineering, biomedicine, ocean engineering, high-end sports goods and the like. In these particular fields of application, titanium alloys are required which have both high strength and good plasticity and toughness. The conventional process for improving the strength of the titanium alloy is to refine the structure of the titanium alloy through thermal deformation by a large plastic deformation method so as to improve the strength of the alloy, and the strengthening of the titanium alloy through the large plastic deformation method is generally accompanied with the loss of toughness and plasticity of the material. The ultra-fine grain titanium alloy material prepared by the large plastic deformation process has the defects of low plasticity and poor toughness, so that the application of the ultra-fine grain titanium alloy material in practical engineering is influenced.
The plasticizing and toughening method for the high-strength titanium alloy reported at present generally adopts a flat roll asynchronous rolling method, and the method needs larger rolling force to form a rolling area and has higher requirements on equipment.
Disclosure of Invention
Aiming at the problems that the toughness and plasticity of the high-strength titanium alloy prepared by the prior art can not meet the use requirement and the prior thermal mechanical processing process has complex steps and high cost, the invention provides a wave-flat hot rolling combined pulse current annealing method for a titanium alloy plate
In order to achieve the purpose, the invention adopts the following technical scheme:
a flat hot rolling combined pulse current annealing method for a titanium alloy plate comprises the following steps:
step 1: the titanium alloy plate is subjected to heat preservation in a beta phase region and then is rapidly quenched in a cooling medium, which is called heat treatment for short;
step 2: rapidly heating and preserving heat of the titanium alloy plate after heat treatment, and then carrying out primary corrugation rolling on the titanium alloy plate to prepare corrugation surfaces on two end surfaces of the titanium alloy;
and step 3: rapidly heating and preserving heat of the titanium alloy plate subjected to corrugated rolling in the step 2, and then performing multi-pass flat rolling;
and 4, step 4: and (3) carrying out pulse current treatment on the rolled titanium alloy plate to obtain the high-strength and high-toughness titanium alloy plate.
Further, the heat preservation temperature of the beta phase region in the step 1 is 1000-1100 ℃ higher than the beta transformation temperature of the titanium alloy; the heat preservation time is 30 min-120 min. The temperature is kept in a temperature range of a beta phase region, so that the atomic components of the titanium alloy are fully and uniformly diffused, but the titanium alloy grains are too large due to overhigh temperature and are not beneficial to subsequent processing, and therefore, the temperature range of 1000-1100 ℃ is selected; meanwhile, the too short heat preservation time is not beneficial to the homogenization of the temperature and the components of the titanium alloy, and the too large time can cause the too coarse grains, so that 30-120 min is selected.
Further, the titanium alloy is subjected to heat treatment in the step 1, wherein the heat treatment needs to be carried out under vacuum, or the titanium alloy material needs to be coated with glass flake high-temperature oxidation-resistant coating.
Further, the rapid quenching in the cooling medium in the step 1 is specifically water quenching or ice water mixture quenching.
Further, the corrugation rolling in the step 2 is corrugation roller rolling, and the upper working roller and the lower working roller are corrugation rollers or any working roller is a corrugation roller. The corrugated roller shape is beneficial to realizing local strong plastic deformation of the material in the rolling process, and by applying uneven load, an isomeric structure with coarse grains and fine grains in mixed distribution is formed in the material, thereby being beneficial to realizing the strengthening and toughening of the material.
Further, the corrugated roller profile curve in the step 2 is any one of a sine curve, a cosine curve or a high-order function curve.
Further, the heating temperature for heating and heat preservation in the step 2 and the step 3 is 500-800 ℃, and the heat preservation is carried out for 30-120 min at the temperature. The heating temperature is too low or the heat preservation time is too short, which is not beneficial to the temperature homogenization in the titanium alloy, and the heating temperature is too high or the heat preservation time is too long, which can cause the crystal grains to grow too much, which is not beneficial to the subsequent processing, so the heating temperature is selected to be 500-800 ℃, and the heat preservation time is selected to be 30-120 min.
Further, the reduction amount in the step 2 is 15-30%. The corrugated roller type can realize strong plastic deformation in materials and can realize grain refinement under smaller rolling reduction, so the rolling reduction can be selected from 15-30 percent, which is one of the advantages of the process.
Further, in the step 3, the single-pass reduction is 5-15%, and the total reduction is 10-40%.
Further, the pulse current parameters of the pulse current processing in the step 4 are pulse frequency 140 Hz-260 Hz, current 25A-30A, voltage 20V-30V and duty ratio 10% -15%.
Compared with the prior art, the invention has the following advantages:
the invention applies step load to the titanium alloy plate by rolling of the corrugated roller, obtains an ultrafine crystal and coarse crystal mixed heterogeneous structure in the titanium alloy plate through the difference of deformation at wave crests and wave troughs, and promotes the recovery recrystallization in the microstructure of the titanium alloy plate by using the electrical effect of pulse current through pulse current annealing, thereby preparing the titanium alloy plate with high strength and good plasticity and toughness.
The method is suitable for titanium alloy, aluminum alloy, magnesium alloy and other metal materials, the prepared sample has high strength and plasticity and toughness, the comprehensive mechanical property of the metal material can be greatly improved, and the metal material with low cost and high performance is prepared.
Drawings
FIG. 1 is a drawing of a corrugated roller plus flat roller rolling process;
FIG. 2 is a drawing of a sample of titanium alloy prepared by the method of example 1 of the present invention;
FIG. 3 is a graph of a sample of titanium alloy prepared using example 2 of the present invention;
FIG. 4 is a drawing of a sample of titanium alloy prepared by the method of example 3 of the present invention;
FIG. 5 is a graph of a sample of titanium alloy prepared using example 4 of the present invention.
Detailed Description
Example 1
Boeing hot rolling combined pulse current annealing method for titanium alloy plate
The titanium alloy comprises the following components in percentage by mass: al: 6.08%, V: 4.03%, Fe: 0.14%, Si: 0.013%, C: 0.018%, O: 0.11%, N: 0.0047%, H: 0.0008% of this alloy TβAbout 975 ℃. The titanium alloy plate is 10mm in thickness, 100mm in length and 50mm in width.
Step 1: the titanium alloy plate is coated with glass flake high-temperature oxidation-resistant coating, water quenching is performed immediately after heat preservation is performed for 1 hour at 1100 ℃, and XRD and TEM analysis of a product of the coating shows that the quenched alloy mainly consists of alpha' hexagonal martensite.
And 2, step: and (3) rapidly heating the sample subjected to heat treatment to 800 ℃, preserving the heat at the temperature for 30 minutes, and then performing primary corrugated roller rolling on the sample, wherein the rolling reduction is 16%.
And step 3: and (3) carrying out 4-pass flat roll rolling on the corrugated surface plate rolled in the step (1), wherein the heating temperature is 700 ℃, the heat preservation time is 30 minutes, and the rolling reduction is 12%, 14%, 48% and 27% respectively. The thickness after rolling was 2.4 mm.
And 4, step 4: and (3) carrying out pulse current treatment on the rolled plate, wherein the pulse frequency is 150Hz, the current is 25A, the voltage is 30V, and the duty ratio is 15%.
Example 1 a titanium alloy sheet was prepared as shown in fig. 2, and the measured mechanical properties are shown in table 1. It can be seen that the prepared titanium alloy sample has higher strength and good plasticity.
Table 1 example 1 mechanical property values
| Status of state | Tensile strength, MPa | Elongation after fracture |
| Example 1 | 1211 | 16％ |
| Original plate | 1053 | 8％ |
Example 2
Boeing hot rolling combined pulse current annealing method for titanium alloy plate
The titanium alloy comprises the following components in percentage by mass: al: 6.08%, V: 4.03%, Fe: 0.14%, Si: 0.013%, C: 0.018%, O: 0.11%, N: 0.0047%, H: 0.0008% of this alloy TβAbout 975 ℃. Thickness of titanium alloy plate10mm, 100mm in length and 50mm in width.
Step 1: coating glass flake high-temperature oxidation-resistant coating on a titanium alloy plate, immediately performing water quenching after heat preservation for 1h at 1100 ℃, and performing XRD (X-ray diffraction) and TEM (transmission electron microscope) analysis on a product of the titanium alloy plate to show that the quenched alloy mainly consists of alpha' hexagonal martensite.
Step 2: and (3) rapidly heating the sample subjected to heat treatment to 800 ℃, preserving the heat at the temperature for 30 minutes, and then performing primary corrugated roller rolling on the sample, wherein the rolling reduction is 15%.
And step 3: and (3) carrying out 4-pass flat roll rolling on the corrugated surface plate rolled in the step (1), wherein the heating temperature is 600 ℃, the heat preservation time is 30 minutes, and the rolling reduction is respectively 8%, 24%, 30% and 36%. The thickness after rolling was 2.8 mm.
And 4, step 4: and (3) carrying out pulse current treatment on the rolled plate, wherein the pulse frequency is 150Hz, the current is 25A, the voltage is 30V, and the duty ratio is 15%.
Example 2 a titanium alloy sheet was prepared as shown in fig. 3, and the measured mechanical properties are shown in table 2. It can be seen that the prepared titanium alloy sample has higher strength and good plasticity.
Table 2 example 2 mechanical property values
| Status of state | Tensile strength, MPa | Elongation after fracture |
| Example 2 | 1225 | 14％ |
| Original plate | 1053 | 8 |
Example 3
Boeing hot rolling combined pulse current annealing method for titanium alloy plate
The titanium alloy comprises the following components in percentage by mass: al: 6.08%, V: 4.03%, Fe: 0.14%, Si: 0.013%, C: 0.018%, O: 0.11%, N: 0.0047%, H: 0.0008% of this alloy TβAnd is about 975 deg.c. The titanium alloy plate is 5mm in thickness, 100mm in length and 50mm in width.
Step 1: coating glass flake high-temperature oxidation-resistant coating on a titanium alloy plate, immediately performing water quenching after heat preservation for 1h at 1100 ℃, and performing XRD (X-ray diffraction) and TEM (transmission electron microscope) analysis on a product of the titanium alloy plate to show that the quenched alloy mainly consists of alpha' hexagonal martensite.
Step 2: and (3) rapidly heating the sample subjected to heat treatment to 800 ℃, preserving the heat at the temperature for 30 minutes, and then performing primary corrugated roller rolling on the sample with the rolling reduction of 14%.
And step 3: and (2) carrying out 2-pass flat roll rolling on the corrugated surface plate rolled in the step (1), wherein the heating temperature is 700 ℃, the heat preservation time is 30 minutes, and the rolling reduction is respectively 13% and 27%. The thickness after rolling was 3.2 mm.
And 4, step 4: and (3) carrying out pulse current treatment on the rolled plate, wherein the pulse frequency is 150Hz, the current is 25A, the voltage is 30V, and the duty ratio is 15%.
Example 3 a titanium alloy sheet was prepared as shown in fig. 4, and the measured mechanical properties are shown in table 3. It can be seen that the prepared titanium alloy sample has higher strength and good plasticity.
Table 3 example 3 mechanical property values
| Status of state | Tensile strength, MPa | Elongation after fracture |
| Example 3 | 1180 | 15％ |
| Original plate | 1042 | 7％ |
Example 4
Wave-flat hot rolling combined pulse current annealing method for titanium alloy plate
The titanium alloy comprises the following components in percentage by mass: al: 6.08%, V: 4.03%, Fe: 0.14%, Si: 0.013%, C: 0.018%, O: 0.11%, N: 0.0047%, H: 0.0008% of this alloy TβAnd is about 975 deg.c. The titanium alloy plate is 5mm in thickness, 100mm in length and 50mm in width.
Step 1: coating glass flake high-temperature oxidation-resistant coating on a titanium alloy plate, immediately performing water quenching after heat preservation for 1h at 1100 ℃, and performing XRD (X-ray diffraction) and TEM (transmission electron microscope) analysis on a product of the titanium alloy plate to show that the quenched alloy mainly consists of alpha' hexagonal martensite.
Step 2: and (3) rapidly heating the sample subjected to heat treatment to 800 ℃, preserving the heat at the temperature for 30 minutes, and then performing primary corrugated roller rolling on the sample, wherein the rolling reduction is 15%.
And step 3: and (3) carrying out 2-pass flat roll rolling on the corrugated surface plate rolled in the step (1), wherein the heating temperature is 600 ℃, the heat preservation time is 30 minutes, and the rolling reduction is 11% and 29% respectively. The thickness after rolling was 3.2 mm.
And 4, step 4: and (3) carrying out pulse current treatment on the rolled plate, wherein the pulse frequency is 150Hz, the current is 25A, the voltage is 30V, and the duty ratio is 15%.
Example 4 a titanium alloy sheet was prepared as shown in fig. 4, and the measured mechanical property parameters are shown in table 4. It can be seen that the prepared titanium alloy sample has higher strength and good plasticity.
Table 4 example 4 mechanical property values
| Status of state | Tensile strength, MPa | Elongation after fracture |
| Example 4 | 1190 | 13％ |
| Original plate | 1042 | 7％ |
Those skilled in the art will appreciate that the invention may be practiced without these specific details. Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (10)
1. A wave-flat hot rolling combined pulse current annealing method for a titanium alloy plate is characterized by comprising the following steps: the method comprises the following steps:
step 1: the titanium alloy plate is subjected to heat preservation in a beta phase region and then is rapidly quenched in a cooling medium, and the step is simply referred to as heat treatment;
step 2: rapidly heating and preserving heat of the titanium alloy plate after heat treatment, and then carrying out primary corrugation rolling on the titanium alloy plate to prepare corrugation surfaces on two end surfaces of the titanium alloy;
and step 3: rapidly heating and preserving heat of the titanium alloy plate subjected to corrugated rolling in the step 2, and then performing multi-pass flat rolling;
and 4, step 4: and (3) carrying out pulse current treatment on the rolled titanium alloy plate to obtain the high-strength and high-toughness titanium alloy plate.
2. The method of claim 1, wherein the steps of hot rolling and pulse current annealing are performed in combination with the wave-flattening and pulse current annealing of the titanium alloy sheet: the temperature of the beta phase region in the step 1 is 1000-1100 ℃; the heat preservation time is 30 min-120 min.
3. The method of claim 1, wherein the steps of hot rolling and pulse current annealing are performed in combination with the wave-flattening and pulse current annealing of the titanium alloy sheet: the step 1 is to carry out heat treatment on the titanium alloy, wherein the heat treatment needs to be carried out under vacuum, or the titanium alloy material needs to be coated with glass flake high-temperature oxidation-resistant coating.
4. The method of claim 1, wherein the steps of hot rolling and pulse current annealing are performed in combination with the wave-flattening and pulse current annealing of the titanium alloy sheet: the rapid quenching in the cooling medium in the step 1 is water quenching or ice-water mixture quenching.
5. The method of claim 1, wherein the steps of hot rolling and pulse current annealing are performed in combination with the wave-flattening and pulse current annealing of the titanium alloy sheet: and 2, rolling by using corrugated rollers as the corrugation rolling in the step 2, wherein the upper working roller and the lower working roller are corrugated rollers or any working roller is a corrugated roller.
6. The method of claim 1, wherein the steps of hot rolling and pulse current annealing are performed in combination with the wave-flattening and pulse current annealing of the titanium alloy sheet: and in the step 2, the corrugated roller profile curve is any one of sine, cosine or high-order function curves.
7. The method of claim 1, wherein the steps of hot rolling and pulse current annealing are performed in combination with the wave-flattening and pulse current annealing of the titanium alloy sheet: the heating temperature for heating and heat preservation in the step 2 and the step 3 is 500-800 ℃, and the heat preservation is carried out for 30-120 min at the temperature.
8. The method of claim 1, wherein the steps of hot rolling and pulse current annealing are performed in combination with the wave-flattening and pulse current annealing of the titanium alloy sheet: the reduction amount of the step 2 is 15-30%.
9. The method of claim 1, wherein the steps of hot rolling and pulse current annealing are performed in combination with the wave-flattening and pulse current annealing of the titanium alloy sheet: in the step 3, the single-pass reduction is 5-15%, and the total reduction is 10-40%.
10. The method for wave-flat hot rolling combined pulse current annealing of the titanium alloy sheet according to claim 1, wherein: the pulse current parameters of the pulse current processing in the step 4 are pulse frequency of 140 Hz-260 Hz, current of 25A-30A, voltage of 20V-30V and duty ratio of 10% -15%.
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