CN114150139A - Heat treatment process for 7050 aluminum alloy forged ring - Google Patents
Heat treatment process for 7050 aluminum alloy forged ring Download PDFInfo
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- CN114150139A CN114150139A CN202111489556.8A CN202111489556A CN114150139A CN 114150139 A CN114150139 A CN 114150139A CN 202111489556 A CN202111489556 A CN 202111489556A CN 114150139 A CN114150139 A CN 114150139A
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- C—CHEMISTRY; METALLURGY
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
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- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
Abstract
The invention discloses a heat treatment process of a 7050 aluminum alloy forged ring, which adopts the technical scheme that the heat treatment process comprises the following steps: step S1: preparing a blank, carrying out heat treatment on the blank, and then carrying out ring rolling on the blank to a designed size to obtain a forged piece; step S2: heating the forge piece to 455-465 ℃ at a fixed temperature, then preserving heat for a period of time, and finally quenching; step S3: carrying out compression cold deformation on the ring piece in the radial direction by using a horse; step S4: carrying out three-level artificial aging treatment on the forged piece, wherein the first-level aging treatment comprises the following steps: keeping the temperature at 117-123 ℃, and then preserving the heat; secondary aging: keeping the temperature at 173-185 ℃, and then discharging from the furnace and cooling by water; and (3) tertiary aging: the method has the advantages that the anisotropy of the material is weakened, the material meets the index requirements of super-strength and super-toughness, and the strength and the toughness of the material are improved.
Description
Technical Field
The invention relates to the field of aluminum alloy material treatment, in particular to a heat treatment process for a 7050 aluminum alloy forged ring.
Background
The 7050 aluminum alloy is a high-strength wrought aluminum alloy which is strengthened by heat treatment of aluminum-zinc-magnesium-copper series, has high alloying degree of the alloy, extremely high strength, good fracture resistance, excellent fatigue resistance, and is widely applied to the aerospace field for manufacturing high-strength parts based on the excellent performance of the alloy. However, with the development of aerospace technology, the requirements for related materials are more and more strict, and the existing 7050 aluminum alloy cannot meet the requirement that the three-dimensional elongation rate reaches more than 4.5% because the mechanical property anisotropy is large, the longitudinal elongation rate can reach more than 10%, the long transverse direction is only 4%, and the short transverse direction is only 3%, so that the use requirement of ultra-strength and ultra-toughness cannot be met at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a heat treatment process for a 7050 aluminum alloy forged ring, which has the advantages of weakening the anisotropy of the material, enabling the material to meet the index requirements of ultra-strength and ultra-toughness, and improving the strength and toughness of the material.
The technical purpose of the invention is realized by the following technical scheme:
a heat treatment process for a 7050 aluminum alloy forged ring comprises the following steps:
step S1: preparing a blank, carrying out heat treatment on the blank, and then carrying out ring rolling on the blank to a designed size to obtain a forged piece;
step S2: heating the forge piece to 455-465 ℃ at a fixed temperature, then preserving heat for a period of time, and finally quenching;
step S3: carrying out compression cold deformation on the ring piece in the radial direction by using a horse;
step S4: carrying out three-level artificial aging treatment on the forged piece, wherein the first-level aging treatment comprises the following steps: keeping the temperature at 117-123 ℃, and then preserving the heat; secondary aging: keeping the temperature at 173-185 ℃, and then discharging from the furnace and cooling by water; and (3) tertiary aging: and (4) keeping the temperature at 115-122 ℃, and then discharging from the furnace for air cooling.
Further, in step S2, the heat retention time is 5 hours.
Further, in step S2, the quenching water temperature is in the range of 35-45 ℃.
Further, in step S3, the cold deformation ratio is controlled to be 1.5% to 2.5%, and the wall thickness reduction is 1 to 2 mm.
Further, in step S3, the cold deformation ratio is controlled to be 1.5% to 2.5%, and the wall thickness reduction is 1 to 2 mm.
Further, in step S4, the primary aging holding time is 20 hours.
Further, in step S4, the secondary aging heat preservation time is 4 hours, and the water cooling time is 6-10 min.
Further, in step S4, the tertiary aging holding time is 24 h.
Further, in step S1, the ring rolling includes: (1) expanding the ring at a high speed; (2) uniformly grinding the ring; (3) and (5) shaping the ring blank.
Furthermore, the percentage of the components of each chemical element in the alloy is that Cr is less than or equal to 0.06; zr: 0.06 to 0.18; mg: 1.7 to 3.1; zn: 5.3 to 6.8; ti: 0.01 to 0.07; mn: 0.05 to 0.01; si: 0.07 to 0.013; the balance being Al.
In conclusion, the invention has the following beneficial effects:
1. according to the invention, through high-temperature solid solution matched with three-stage aging treatment, a strengthening phase is precipitated in the alloy, the precipitated strengthening phase can block dislocation movement, the toughness and strength of the alloy are enhanced when the reaction is carried out to a macroscopic level, and the strengthening phase is uniform and compact, so that the anisotropy of the material is weakened, and the alloy anisotropy meets the use requirements of ultra-strength and ultra-toughness.
2. The optimal alloy formula is selected, different metal strengthening phases can be separated out, dislocation movement can be blocked, and the comprehensive mechanical property of the alloy is improved.
Drawings
FIG. 1 is a schematic illustration of a heat treatment process for a 7050 aluminum alloy forged ring;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
Example 1:
a heat treatment process of a 7050 aluminum alloy forged ring is shown in figure 1 and comprises the following steps:
step S1:
(1) preparing a blank, wherein the percentage of Cr in each chemical element in the alloy is less than or equal to 0.06; zr: 0.06 to 0.18; mg: 1.7 to 3.1; zn: 5.3 to 6.8; ti: 0.01 to 0.07; mn: 0.05 to 0.01; si: 0.07 to 0.013; the balance being Al.
(2) Blank heat treatment: a. isothermal treatment: the blank is heated to 426 ℃ and kept warm for 10 h. b. Secondary isothermal treatment: after the primary isothermal treatment and heat preservation are finished, the blank is heated to 465 ℃ and heat preservation is carried out for 12 hours.
(3) Ring rolling the billet to design dimensions comprises: a. expanding the ring at a high speed; b. uniformly grinding the ring; c, shaping the ring blank. The rolling size of the forging is phi 2290 +/-5 multiplied by phi 2128 +/-5 multiplied by 1360 +/-5 mm.
Step S2:
heating the forging piece to 455 ℃ at a fixed temperature, then preserving heat for a period of time, wherein the heat preservation time is 5 hours, and finally quenching, wherein the quenching water temperature range is 35 ℃.
Step S3:
and (3) carrying out radial compression cold deformation on the ring piece by using a saddle, wherein the cold deformation rate of the forged piece is controlled to be 1.5-2.5%, and the wall thickness reduction is 1-2 mm.
Step S4: carrying out three-level artificial aging treatment on the forged piece, and specifically comprising the following steps:
primary aging: the temperature is kept constant at 117 ℃, and then the temperature is kept for 20 h.
Secondary aging: and (5) keeping the temperature at 173 ℃, preserving the heat for 4 hours, then discharging from the furnace, and cooling by water for 6-10 min.
And (3) tertiary aging: the temperature is fixed at 115 ℃, the temperature is kept for 24 hours, and then the mixture is discharged from the furnace and cooled to the room temperature.
Step S5: and (4) taking the forge piece to test the mechanical properties in the circumferential direction, the axial direction and the radial direction.
Example 2:
the procedure differs from example 1 in that:
step S1:
(2) blank heat treatment: a. isothermal treatment: the blank is heated to 431 ℃ and kept warm for 10 h. b. Secondary isothermal treatment: after the primary isothermal treatment and heat preservation are finished, the blank is heated to 469 ℃ and heat preservation is carried out for 12 hours.
Step S2:
heating the forging piece to 460 ℃ at a constant temperature, then preserving heat for a period of time, wherein the heat preservation time is 5 hours, and finally quenching, wherein the quenching water temperature range is 40 ℃.
Step S4: carrying out three-level artificial aging treatment on the forged piece, and specifically comprising the following steps:
primary aging: the temperature is fixed at 121 ℃, and then the temperature is kept for 20 h.
Secondary aging: and (4) keeping the temperature at 177 ℃, preserving the heat for 4 hours, and then discharging from the furnace and cooling by water for 6-10 min.
And (3) tertiary aging: and keeping the temperature at 121 ℃ for 24 hours, and then discharging from the furnace and cooling to room temperature in air.
Example 3:
the procedure differs from example 1 in that:
step S1:
(2) blank heat treatment: a. isothermal treatment: the blank was heated to 435 ℃ and held for 10 h. b. Secondary isothermal treatment: and after the primary isothermal treatment and heat preservation are finished, heating the blank to 477 ℃, and preserving heat for 12 hours.
Step S2:
heating the forging piece to 465 ℃ at a fixed temperature, then preserving heat for a period of time, wherein the preserving heat is 5 hours, and finally quenching, wherein the quenching water temperature range is 45 ℃.
Step S4: carrying out three-level artificial aging treatment on the forged piece, and specifically comprising the following steps:
primary aging: the temperature is fixed to 123 ℃, and then the temperature is kept for 20 h.
Secondary aging: keeping the temperature at 185 ℃ for 4h, taking the product out of the furnace, and cooling the product for 6-10 min.
And (3) tertiary aging: the temperature is fixed at 122 ℃, the temperature is kept for 24 hours, and then the mixture is discharged from the furnace and cooled to the room temperature.
Detecting the three-dimensional mechanical property of the forged piece:
one forging was randomly selected from examples 1-3 for testing, and another was selected from forgings produced in the same batch for testing.
The results are shown in Table 1.
TABLE 1
And (3) analyzing an experimental structure:
1. the average longitudinal tensile strength of the forge piece is 564.25 MPa; the average transverse tensile strength of the forge piece is 553.75 MPa; the average high tensile strength of the forging is 555.5 MPa. The three-dimensional mechanical property index can meet the technical requirement that the tensile strength is more than or equal to 550 Mpa.
2. The average longitudinal yield strength of the forge piece is 513.75 Mpa; the average transverse yield strength of the forging is 507.5 MPa; the average high yield strength of the forging is 506.5 MPa. The three-dimensional mechanical property indexes meet the technical requirement that the yield strength is more than or equal to 500 Mpa.
3. The longitudinal elongation of the forging is 10.875% on average; the transverse elongation of the forging is averagely 7.625%; the high-direction elongation of the forging piece is 7.25% on average. The three-dimensional mechanical property index can meet the technical requirement that the elongation is more than or equal to 4.5 percent.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A heat treatment process for a 7050 aluminum alloy forged ring is characterized by comprising the following steps:
step S1: preparing a blank, carrying out heat treatment on the blank, and then carrying out ring rolling on the blank to a designed size to obtain a forged piece;
step S2: heating the forge piece to 455-465 ℃ at a fixed temperature, then preserving heat for a period of time, and finally quenching;
step S3: carrying out compression cold deformation on the ring piece in the radial direction by using a horse;
step S4: carrying out three-level artificial aging treatment on the forged piece, wherein the first-level aging treatment comprises the following steps: keeping the temperature at 117-123 ℃, and then preserving the heat; secondary aging: keeping the temperature at 173-185 ℃, and then discharging from the furnace and cooling by water; and (3) tertiary aging: and (4) keeping the temperature at 115-122 ℃, and then discharging from the furnace for air cooling.
2. The heat treatment process of the 7050 aluminum alloy forged ring according to claim 1, wherein: in step S2, the heat retention time is 5 hours.
3. The heat treatment process of the 7050 aluminum alloy forged ring according to claim 2, wherein: in step S2, the quenching water temperature is in the range of 35-45 ℃.
4. The heat treatment process of the 7050 aluminum alloy forged ring according to claim 1, wherein: in step S3, the cold deformation rate is controlled to 1.5% -2.5%, and the wall thickness reduction is 1-2 mm.
5. The heat treatment process of the 7050 aluminum alloy forged ring according to claim 1, wherein: in step S4, the primary aging holding time is 20 h.
6. The heat treatment process of the 7050 aluminum alloy forged ring according to claim 1, wherein: in step S4, the secondary aging heat preservation time is 4 hours, and the water cooling time is 6-10 min.
7. The heat treatment process of the 7050 aluminum alloy forged ring according to claim 1, wherein: in step S4, the three-stage aging heat preservation time is 24 h.
8. The heat treatment process of the 7050 aluminum alloy forged ring according to claim 1, wherein: in step S1, the ring rolling includes: (1) expanding the ring at a high speed; (2) uniformly grinding the ring; (3) and (5) shaping the ring blank.
9. A 7050 aluminum alloy produced by the heat treatment process of a 7050 aluminum alloy forged ring according to any one of claims 1 to 8, wherein: the percentage of the components of each chemical element in the alloy is that Cr is less than or equal to 0.06; zr: 0.06 to 0.18; mg: 1.7 to 3.1; zn: 5.3 to 6.8; ti: 0.01 to 0.07; mn: 0.05 to 0.01; si: 0.07 to 0.013; the balance being Al.
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| CN202111489556.8A CN114150139A (en) | 2021-12-08 | 2021-12-08 | Heat treatment process for 7050 aluminum alloy forged ring |
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| CN202111489556.8A CN114150139A (en) | 2021-12-08 | 2021-12-08 | Heat treatment process for 7050 aluminum alloy forged ring |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5785777A (en) * | 1996-11-22 | 1998-07-28 | Reynolds Metals Company | Method of making an AA7000 series aluminum wrought product having a modified solution heat treating process for improved exfoliation corrosion resistance |
| CN106244959A (en) * | 2016-08-31 | 2016-12-21 | 无锡派克新材料科技股份有限公司 | The forging of a kind of 7085 aluminium alloys and Technology for Heating Processing |
| CN107675113A (en) * | 2017-11-23 | 2018-02-09 | 张永 | A kind of forging of 7085 aluminium alloy and Technology for Heating Processing |
| CN107937842A (en) * | 2017-12-01 | 2018-04-20 | 中南大学 | A kind of heat treatment method of Al Zn Mg Cu aluminium alloys |
-
2021
- 2021-12-08 CN CN202111489556.8A patent/CN114150139A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5785777A (en) * | 1996-11-22 | 1998-07-28 | Reynolds Metals Company | Method of making an AA7000 series aluminum wrought product having a modified solution heat treating process for improved exfoliation corrosion resistance |
| CN106244959A (en) * | 2016-08-31 | 2016-12-21 | 无锡派克新材料科技股份有限公司 | The forging of a kind of 7085 aluminium alloys and Technology for Heating Processing |
| CN107675113A (en) * | 2017-11-23 | 2018-02-09 | 张永 | A kind of forging of 7085 aluminium alloy and Technology for Heating Processing |
| CN107937842A (en) * | 2017-12-01 | 2018-04-20 | 中南大学 | A kind of heat treatment method of Al Zn Mg Cu aluminium alloys |
Non-Patent Citations (1)
| Title |
|---|
| 周鸿章等 * |
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