CN109897999B - Production process of high-strength high-toughness 2XXX aluminum alloy forge piece - Google Patents
Production process of high-strength high-toughness 2XXX aluminum alloy forge piece Download PDFInfo
- Publication number
- CN109897999B CN109897999B CN201910342195.0A CN201910342195A CN109897999B CN 109897999 B CN109897999 B CN 109897999B CN 201910342195 A CN201910342195 A CN 201910342195A CN 109897999 B CN109897999 B CN 109897999B
- Authority
- CN
- China
- Prior art keywords
- aluminum alloy
- extrusion
- forging
- temperature
- toughness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Forging (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to a production process of a high-strength high-toughness 2XXX aluminum alloy forging, which is characterized in that ingredients for processing an aluminum alloy ingot are sequentially subjected to smelting, two-stage homogenization treatment, extrusion blank forming, extrusion blank annealing, forging forming and rapid T6 heat treatment to be processed into the high-strength high-toughness 2XXX aluminum alloy forging. When the solid solution aging is carried out, high temperature is adopted at a certain temperature point above a heat absorption point, and short time is ensured. The heat is not enough to melt the intercrystalline metal but enough to refine the intercrystalline compounds into the matrix, thereby improving the strength and plasticity of the alloy.
Description
Technical Field
The invention relates to a production process of a high-strength high-toughness 2XXX aluminum alloy forging, and belongs to the technical field of aluminum alloy processing.
Background
The 2XXX aluminum alloy belongs to heat-treatable strengthened alloy and has the excellent performances of high strength, high toughness, corrosion resistance and the like. The 2XXX aluminum alloy is widely applied to the fields of aerospace, military equipment and related civil industry. The properties of the alloy mainly depend on the streamline direction, the types, sizes and forms of the precipitated phases in and among the crystal grains. Therefore, the aluminum alloy structure is adjusted through heat treatment, the potential of the 2XXX aluminum alloy is fully excavated, the requirement of high-tech fields such as aerospace on the high performance of the aluminum alloy is met, and the method has strong practical significance and use value.
The conventional 2XXX alloy has the phenomena that secondary particles precipitated among crystals are coarse during heat treatment, no precipitation zone exists in the crystal boundary, and the crystal boundary segregation and the like occur among Mg, Si and a small amount of Cu elements. And the conventional domestic T6 heat treatment process has long time, high energy consumption and poor stability. In order to solve the problems, the invention provides a novel heat treatment method which can form a compact structure and improve the alloy performance through systematic research.
Disclosure of Invention
The invention provides a production process of a high-strength high-toughness 2XXX aluminum alloy forging, aiming at the problems of low strength, plasticity, fatigue life, poor corrosion resistance and the like of the 2XXX aluminum alloy forging in the prior art.
The technical scheme for solving the technical problems is as follows: a production process of a high-strength high-toughness 2XXX aluminum alloy forging is characterized in that ingredients for processing an aluminum alloy ingot are sequentially subjected to smelting, two-stage homogenization treatment, extrusion blank forming, extrusion blank annealing, forging forming and rapid T6 heat treatment to be processed into the high-strength high-toughness 2XXX aluminum alloy forging;
step 1, the smelting is to place the prepared aluminum alloy raw material into a smelting furnace to be smelted into liquid aluminum alloy, and the liquid aluminum alloy is cast into an aluminum alloy ingot;
step 2, performing two-stage homogenization treatment on the aluminum alloy ingot casting in the step 1 to eliminate component segregation in the aluminum ingot;
step 3, the extrusion blank is formed by putting the cast ingot subjected to the two-stage homogenization treatment in the step 2 into an extrusion die for uniform extrusion to obtain an extrusion bar material with the size and tolerance meeting the requirements; wherein the temperature of the extrusion cylinder is 450 deg.C
At 470 deg.C, the extrusion speed is 1.0
2.0m/min；
Step 4, the extrusion blank annealing is to carry out secondary homogenization annealing on the extrusion bar in the step 3, and further eliminate cast ecological original phase and secondary phase precipitated in the extrusion process;
step 5, the forging forming is to saw the extrusion blank obtained in the step 4 into required size, heat the extrusion blank to 450 to 480 ℃, and process the extrusion blank into a forging blank by utilizing a die and equipment;
step 6, the rapid T6 heat treatment is to perform heat treatment on the forged blank obtained after the forging forming in the step 5; the treatment method is solid solution and aging, and the solid solution temperature is 510
Heating at 525 deg.C for 15 deg.C
30min, strictly controlling the water inlet time, wherein the time from discharging to water inlet is not more than 5 seconds, and then carrying out artificial aging treatment at the artificial aging temperature of 130
At 160 ℃ for 15
20h。。
On the basis of the technical scheme, in order to achieve the convenience of use and the stability of equipment, the invention can also make the following improvements on the technical scheme:
further, the ingredients for the aluminum alloy ingot casting are prepared according to the following mass percentages:
Si:0.6
1.2、Fe:≤0.7、Cu：3.9
4.8、Mn：0.4
1.0、Mg：0.40
0.8, Ni is less than or equal to 0.1, Zn: less than or equal to 0.3 percent, less than or equal to 0.15 percent of Ti, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al.
Further, the temperature of the liquid aluminum alloy smelted in the step 1 is 700 DEG
The cast ingot temperature of the aluminum alloy after casting is 200 ℃ at 750 DEG C
Cooling rate of liquid aluminum alloy at 250 ℃ of 40
50℃/min。、
Further, the double-stage homogenization annealing process in the step 2 is 395 ℃ for 24h +490 ℃ for 10 h.
Further, the two-stage annealing process in the step 4 is 485 ℃ for 24h +510 ℃ for 15 h.
Further, in the forging step 5, the press down speed 10 is set
15mm/s, the mold temperature was constant throughout the forming process.
The invention has the advantages that: 1. in the production process of the 2XXX aluminum alloy forging disclosed by the invention, the as-cast alloy mainly comprises dendritic Al, a dendritic eutectic structure, a skeletal black phase and a high-density and fine precipitated phase distributed in an Al matrix. Scanning electron microscope results show that gray and bright white coarse second phases exist among the crystals, energy spectrum analysis shows that the phases are Al2Cu phases, AlCuMgSi phases and iron-rich phases, and composition surface scanning results also clearly show the contained composition information of the intergranular second phases with different colors and shapes. As can be seen, the alloy cast rod contains a large amount of coarse intermetallic compound phases, and the phases and the morphology thereof need to be partially dissolved or regulated through homogenization treatment so as to reduce the influence on subsequent deformation processing and final performance.
2. The Fe and Mn elements mainly form iron-rich phases, exist among dendrites, are difficult to dissolve in the homogenization process, and are fractured and spheroidized. Meanwhile, the iron-rich phases contain Cu, so that the solid solution amount of the Cu is indirectly weakened, and the content of alloy precipitated phases and the final precipitation strengthening effect are influenced, but the effect cannot be avoided. A large amount of Cu element forms an Al2Cu phase between dendrites, which gradually dissolves during homogenization, but the above homogenization results show that it is difficult to completely dissolve the Al2Cu phase, and finally a small amount of Al2Cu phase still exists between dendrites.
Drawings
FIG. 1 is a DSC curve of 2A 50;
FIG. 2 is a DSC curve of 2A 14;
FIG. 3 is a schematic diagram of the casting parts required to be detected by GJB 2351-95.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
A production process of a high-strength high-toughness 2XXX aluminum alloy forging is characterized in that ingredients for processing an aluminum alloy ingot are sequentially subjected to smelting, two-stage homogenization treatment, extrusion blank forming, extrusion blank annealing, forging forming and rapid T6 heat treatment to be processed into the high-strength high-toughness 2XXX aluminum alloy forging;
step 1, the smelting is to place the prepared aluminum alloy raw material into a smelting furnace to be smelted into liquid aluminum alloy, and the liquid aluminum alloy is cast into an aluminum alloy ingot;
step 2, performing two-stage homogenization treatment on the aluminum alloy ingot casting in the step 1 to eliminate component segregation in the aluminum ingot;
step 3, the extrusion blank is formed by putting the cast ingot subjected to the two-stage homogenization treatment in the step 2 into an extrusion die for uniform extrusion to obtain an extrusion bar material with the size and tolerance meeting the requirements; wherein the temperature of the extrusion cylinder is 450 deg.C
At 470 deg.C, the extrusion speed is 1.0
2.0m/min；
Step 4, the extrusion blank annealing is to carry out secondary homogenization annealing on the extrusion bar in the step 3, and further eliminate cast ecological original phase and secondary phase precipitated in the extrusion process;
step 5, the forging forming is to saw the extrusion blank obtained in the step 4 into required size, heat the extrusion blank to 450 to 480 ℃, and process the extrusion blank into a forging blank by utilizing a die and equipment;
step 6, the rapid T6 heat treatment is to perform heat treatment on the forged blank obtained after the forging forming in the step 5; the treatment method is solid solution and aging, and the solid solution temperature is 510
Heating at 525 deg.C for 15 deg.C
30min, strictly controlling the water inlet time, wherein the time from discharging to water inlet is not more than 5 seconds, and then carrying out artificial aging treatment at the artificial aging temperature of 130
At 160 ℃ for 15
20h。
In the 2A50 aluminum alloy forging (see figure 1), the initial temperature of the endothermic peak of the material is 530 ℃, the finishing time is 536 ℃, the solid solution temperature of the traditional heat treatment is generally 525 ℃ plus 2h, and in the application, the heat treatment temperature is generally 545 ℃ plus 30 min. In FIG. 1, only one endothermic peak is shown, which has an initial temperature of 530 ℃ and a peak temperature of 536 ℃, and thus it can be seen that the initial melting temperature of the nonequilibrium low melting point eutectic structure in the alloy is 530 ℃ and the conventional heat treatment specifies that the solid solution temperature does not exceed 530 ℃. A large number of experiments prove that after the temperature of the endothermic peak is exceeded, the intercrystalline compound is quickly dissolved except a small amount of AlCuMgSi phase, and the grain boundary of the edge part is slightly thickened along with the extension of the heat preservation time, but the metallographic structure is not obvious.
The forging is made of 2A14 aluminum alloy (see figure 2), the initial temperature of the endothermic peak of the material is 510 ℃, the finishing time is 515.1 ℃, the solution temperature of the traditional heat treatment is generally 505 ℃ plus 2h, and the heat treatment temperature in the application is generally 525 ℃ plus 20 min. In FIG. 2, only one endothermic peak is shown, which has an onset temperature of 510.7 ℃ and a peak temperature of 515.1 ℃, and thus it can be seen that the alloy has an onset melting temperature of 510 ℃ for the non-equilibrium low melting point eutectic structure and that conventional heat treatment specifies a solid solution temperature of not more than 510 ℃. A large number of experiments prove that after the temperature of the endothermic peak is exceeded, the intercrystalline compound is quickly dissolved except a small amount of AlCuMgSi phase, and the grain boundary of the edge part is slightly thickened along with the extension of the heat preservation time, but the metallographic structure is not obvious.
Tests prove that the heating process can save the solid solution time, reduce the energy consumption, refine the size of the strengthening phase and greatly improve the plasticity and the strength of the alloy at the same time.
The performance requirements of the following parts according to the requirements of GJB2351-95 are as follows (see FIG. 3):
actual value (2a 50):
actual value (2A14)
As can be seen from the actual detection values, the 2XXX aluminum alloy forging produced by the process has the elongation rate obviously higher than that required by the GJB2351-95 parts.
The strength of the tensile sample of the same part of the aluminum alloy forging produced by rapid T6 heat treatment can be improved by 20%, and meanwhile, the plasticity is improved by 50%.
The processing steps of the above embodiment are specifically described as follows:
the ingredients for the aluminum alloy ingot casting are prepared according to the following mass percentages: si 0.6
1.2、Fe:≤0.7、Cu：3.9
4.8、Mn：0.4
1.0、Mg：0.40
0.8, Ni is less than or equal to 0.1, Zn: less than or equal to 0.3 percent, less than or equal to 0.15 percent of Ti, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al.
The temperature of the liquid aluminum alloy smelted in the step 1 is 700 DEG
The cast ingot temperature of the aluminum alloy after casting is 200 ℃ at 750 DEG C
Cooling rate of liquid aluminum alloy at 250 ℃ of 40
50℃/min。
The double-stage homogenizing annealing process in the step 2 is carried out at 395 ℃ for 24h +490 ℃ for 10 h.
The two-stage annealing process in the step 4 is carried out at 485 ℃ for 24h +510 ℃ for 15 h.
Pressing speed of press 10 during forging forming in step 5
15mm/s, the mold temperature was constant throughout the forming process.
In order to improve the strength and plasticity of the alloy, the heat treatment method different from the traditional T6 heat treatment method is invented.
Conventional T6 heat treatments generally have a solution temperature less than the temperature of the endothermic front in the DSC curve of the material, since the endothermic point is the point at which the intercrystalline compounds of the aluminum alloy material melt. However, it has been shown in a number of tests that the material does not melt immediately at the temperature of the heat absorption front, but only after a certain time. When the solid solution aging is carried out, high temperature is adopted at a certain temperature point above a heat absorption point, and short time is ensured. The heat is not enough to melt the intercrystalline metal but enough to refine the intercrystalline compounds into the matrix, thereby improving the strength and plasticity of the alloy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A production process of a high-strength high-toughness 2XXX aluminum alloy forging is characterized in that ingredients for processing an aluminum alloy ingot are sequentially subjected to smelting, two-stage homogenization treatment, extrusion blank forming, extrusion blank annealing, forging forming and rapid T6 heat treatment to be processed into the high-strength high-toughness 2XXX aluminum alloy forging;
step 1, the smelting is to place the prepared aluminum alloy raw material into a smelting furnace to be smelted into liquid aluminum alloy, and the liquid aluminum alloy is cast into an aluminum alloy ingot; the ingredients for the aluminum alloy ingot casting are prepared according to the following mass percentages: si:
Fe:≤0.7、Cu：
Mn：
Mg：
ni is less than or equal to 0.1, Zn: less than or equal to 0.3 percent, less than or equal to 0.15 percent of Ti, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al
Step 2, performing two-stage homogenization treatment on the aluminum alloy ingot casting in the step 1 to eliminate component segregation in the aluminum ingot; the double-stage homogenizing annealing process is carried out for 24h at 395 ℃ and 10h at 490 ℃;
step 3, the extrusion blank is formed by putting the cast ingot subjected to the two-stage homogenization treatment in the step 2 into an extrusion die for uniform extrusion to obtain an extrusion bar material with the size and tolerance meeting the requirements; wherein the temperature of the extrusion container is
An extrusion speed of
Step 4, the extrusion blank annealing is to carry out secondary homogenization annealing on the extrusion bar in the step 3, and further eliminate cast ecological original phase and secondary phase precipitated in the extrusion process; the two-stage annealing process is carried out at 485 ℃ for 24h +510 ℃ for 15 h;
step 5, the forging forming is to saw the extrusion blank obtained in the step 4 into required size, heat the extrusion blank to 450 to 480 ℃, and process the extrusion blank into a forging blank by utilizing a die and equipment;
step 6, the rapid T6 heat treatment is to heat treat the forged blank after the forging forming in the step 5, and is a treatment mode of solution and aging, wherein the solution temperature is
Heating and heat preservationAt a time of
Controlling the water inlet time, wherein the time from discharging to water inlet is not more than 5 seconds, and then carrying out artificial aging treatment at the artificial aging temperature
At a time of
2. The production process of the high-strength high-toughness 2XXX aluminum alloy forging piece according to claim 1, wherein the temperature of the liquid aluminum alloy smelted in the step 1 is
The cast aluminum alloy ingot has the temperature of
The cooling rate of the liquid aluminum alloy is
3. The production process of the high-strength high-toughness 2XXX aluminum alloy forging piece according to claim 1, wherein the pressing speed of a press is increased during forging forming in step 5
The mold temperature was constant throughout the forming process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910342195.0A CN109897999B (en) | 2019-04-26 | 2019-04-26 | Production process of high-strength high-toughness 2XXX aluminum alloy forge piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910342195.0A CN109897999B (en) | 2019-04-26 | 2019-04-26 | Production process of high-strength high-toughness 2XXX aluminum alloy forge piece |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109897999A CN109897999A (en) | 2019-06-18 |
| CN109897999B true CN109897999B (en) | 2020-04-21 |
Family
ID=66956455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910342195.0A Expired - Fee Related CN109897999B (en) | 2019-04-26 | 2019-04-26 | Production process of high-strength high-toughness 2XXX aluminum alloy forge piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109897999B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111004950B (en) * | 2019-12-30 | 2021-07-20 | 辽宁忠旺集团有限公司 | 2000 aluminium alloy section bar and its manufacturing method |
| CN113293273B (en) * | 2021-04-13 | 2023-03-31 | 中铝材料应用研究院有限公司 | Processing method of 2xxx series aluminum alloy bar and wire for fastener |
| CN113857401B (en) * | 2021-09-05 | 2023-05-05 | 桂林理工大学 | Isothermal extrusion process for Al-Zn-Mg-Sc alloy hard disk cartridge body |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831135A (en) * | 2015-05-08 | 2015-08-12 | 福建省闽发铝业股份有限公司 | Method for producing thermal-resistant aluminum alloy |
| CN105441839A (en) * | 2016-01-12 | 2016-03-30 | 苏州有色金属研究院有限公司 | Processing technology for improving fatigue damage resistance of 2xxx series aluminium alloy plate |
| CN106048344A (en) * | 2016-06-30 | 2016-10-26 | 合肥慧林建材有限公司 | High-strength aluminum alloy profile and production process thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070102071A1 (en) * | 2005-11-09 | 2007-05-10 | Bac Of Virginia, Llc | High strength, high toughness, weldable, ballistic quality, castable aluminum alloy, heat treatment for same and articles produced from same |
-
2019
- 2019-04-26 CN CN201910342195.0A patent/CN109897999B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831135A (en) * | 2015-05-08 | 2015-08-12 | 福建省闽发铝业股份有限公司 | Method for producing thermal-resistant aluminum alloy |
| CN105441839A (en) * | 2016-01-12 | 2016-03-30 | 苏州有色金属研究院有限公司 | Processing technology for improving fatigue damage resistance of 2xxx series aluminium alloy plate |
| CN106048344A (en) * | 2016-06-30 | 2016-10-26 | 合肥慧林建材有限公司 | High-strength aluminum alloy profile and production process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109897999A (en) | 2019-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108823472B (en) | High-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy and heat treatment method thereof | |
| CN109136669B (en) | Aluminum alloy forging and preparation method and application thereof | |
| CN107130156B (en) | A kind of founding and heat treatment process of high Zn constituent content aluminium alloy | |
| WO2015109893A1 (en) | Al-mg-si-cu-zn series alloy of fast ageing response type and preparation method therefor | |
| CN109881062B (en) | High-strength, high-toughness and high-modulus extrusion casting magnesium alloy and preparation method thereof | |
| CN109897999B (en) | Production process of high-strength high-toughness 2XXX aluminum alloy forge piece | |
| CN108977710B (en) | Extrusion casting magnesium alloy material and preparation method thereof | |
| WO2012051074A2 (en) | Hot thermo-mechanical processing of heat-treatable aluminum alloys | |
| CN112553511B (en) | 6082 aluminum alloy material and preparation method thereof | |
| CN105568082A (en) | Heat treatment method for Al-Si-Cu-Mg casting alloy | |
| CN115852214B (en) | High-strength and high-toughness aluminum alloy capable of being strengthened by heat treatment and preparation method thereof | |
| CN115233046A (en) | Al-Si-Mg-Fe aluminum alloy with high iron content based on non-heat treatment of secondary aluminum and preparation method thereof | |
| US10604828B2 (en) | Al—Zn alloy comprising precipitates with improved strength and elongation and method of manufacturing the same | |
| CN109735731A (en) | A kind of process preparing Ultra-fine Grained high strength alumin ium alloy | |
| CN113234974A (en) | Method for reducing thermoplastic deformation resistance of Er microalloyed 7000 series aluminum alloy | |
| CN111074121B (en) | Aluminum alloy and preparation method thereof | |
| CN109722572A (en) | A kind of power transmission and transforming equipment high-performance aluminium alloy and preparation method thereof | |
| CN114369776B (en) | Method for improving strength of (Ce + Yb) composite modified hypoeutectic Al-Si-Mg-Cu-Cr alloy | |
| CN114107757B (en) | Cast aluminum alloy for automobile metal casting and processing technology thereof | |
| CN112501482B (en) | Si microalloyed AlZnMgCu alloy and preparation method thereof | |
| CN114457266A (en) | Ultrahigh-strength and toughness cast aluminum alloy and forming method thereof | |
| WO2002097148A2 (en) | Aluminum alloys and methods of making the same | |
| CN106756342B (en) | A kind of heat-treatable strengthened high strength high toughness casting aluminum alloy and preparation method | |
| CN105671376B (en) | High-strength and high-plasticity hypoeutectic aluminium-silicon alloy material manufactured through gravity casting and room-temperature cold rolling, and manufacturing method thereof | |
| CN113755769B (en) | High-strength high-toughness aluminum-based composite material and heat treatment method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200421 Termination date: 20210426 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |