CN103422035B - A kind of creep age forming method for Al-Cu-Mg alloy sheet material - Google Patents
A kind of creep age forming method for Al-Cu-Mg alloy sheet material Download PDFInfo
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Abstract
The invention discloses a kind of creep age forming method of Al-Cu-Mg alloy sheet material, be mainly used in weakening Al-Cu-Mg alloy sheet material creep ageing anisotropy, improve the heat treating method of alloy property.Adopt shrend after 490 ~ 505 DEG C of solid solution 30min ~ 70min, after quenching, sheet material carries out the pre-treatment of 2-10%, and carry out creep ageing subsequently, wherein creep temperature chooses 150 DEG C ~ 200 DEG C, and creep time is 0 ~ 12h, and creep stress is 150MPa ~ 300MPa.Pre-treatment time controling is within 4h.Utilize process Al-Cu-Mg alloy of the present invention, by the precipitation of regulation and control alloy creep ageing strengthening phase, the mechanical property of sheet alloy can be improved, reduce the anisotropic degree of sheet material.Adopt process Al-Cu-Mg alloy of the present invention, compared with normative heat treatment, mechanical properties at least improves 10%, and anisotropy at least reduces by 10%.This processing method is easy and simple to handle, Be very effective, compares and uses microalloying to improve alloy microtexture composition, cost-saving, and is easy to realize in the industrial production.Comprehensive benefit is apparently higher than the treatment process reported.
Description
Technical field
The present invention relates to a kind of heat treating method improving creep forming aluminum alloy plate materials performance and anisotropic degree, be applicable to the creep forming of aerospace Al-Cu-Mg alloy plate members, nonferrous materials processing engineering technology field.
Background technology
The plurality of advantages such as Al-Cu-Mg alloy belongs to ageing strengthening aluminium alloy, has intensity high, and fracture toughness property is good, thermotolerance, solidity to corrosion, and fatigue crack extendability is strong, are widely used as aerospace wallboard, covering class A of geometric unitA material.Research shows, the main strengthening phase Al of Al-Cu-Mg alloy
2cuMg, Al
2cu is in conventional creep ag(e)ing process, and pick-up behavior can be subject to the impact of applied stress action direction, causes S ', θ ' at the <100> of action of pulling stress
alon direction, be parallel to stress direction and preferentially separate out, preferentially separate out under action of compressive stress perpendicular to stress direction, namely occur that so-called position of separating out is to effect, this phenomenon causes sheet alloy anisotropic degree to increase, and causes the ununiformity of component performance.The comparatively serious Al-Cu-Mg alloy component of anisotropic degree is difficult to the service requirements meeting the high-end equipments such as aerospace.
Summary of the invention
The object of the present invention is to provide a kind of novel Al-Cu-Mg alloy creep age forming method, the object of the method is: separated out in creep ageing process by the main strengthening phase S ', the θ ' that regulate and control Al-Cu-Mg alloy, weaken the position of precipitated phase to effect, effectively reduce the anisotropic degree of sheet alloy after creep forming, improve the mechanical property of Al-Cu-Mg alloy.
Object of the present invention realizes by the following method.
A creep age forming method for Al-Cu-Mg alloy sheet material, during the thermal treatment of Al-Cu-Mg alloy sheet material, shrend after solid solution, after quenching, sheet material carries out the pre-treatment of 2-10%, then creep; Pre-treatment time controling is within 4h, and this is the impact in order to reduce the rear natural aging alloy structure property of sheet material quenching as much as possible.
Require that the pre-treatment time is more short better.
Described method, described pre-treatment is preliminary draft or precompression.
Described method, the mode of solid solution, shrend comprises: adopt shrend after 490 ~ 505 DEG C of solid solution 50min ~ 70min, or adopt shrend after 490 ~ 505 DEG C of salt bath furnace solid solution 40min ~ 60min, or adopt roll body stove spray shrend after 490 ~ 505 DEG C of solid solution 50min ~ 70min.
Described method, creep ageing temperature chooses 150 DEG C ~ 200 DEG C, and creep time is 2 ~ 12h, and creep stress is 150MPa ~ 300MPa.
Described method, Al-Cu-Mg alloy sheet metal thickness is 2mm ~ 80mm.
The present invention has following consideration in thermal treatment: by the pre-treatment after alloy solid solution-quenching and before creep ageing, introduce a large amount of dislocations and dislocation configuration in the alloy, main strengthening phase S ', θ ' preferential Nucleation Mechanism in dislocation structure is started, cause alloy at creep initial stage just preferential forming core on different precipitation faces, thus also just inhibit the precipitation position phase effect of main strengthening phase S ', θ '.Preferentially separate out due to main strengthening phase and be eliminated, the mechanical property difference of all directions is reduced, reduces the anisotropic degree of sheet material, and improve the mechanical property of sheet alloy.
After the invention has the advantages that the solid solution-quenching of Al-Cu-Mg alloy sheet material, carry out a small amount of predeformation to it, regulation and control precipitated phase pick-up behavior, puies forward heavy alloyed mechanical property, reduces the anisotropic degree of sheet material.This processing method is easy and simple to handle, Be very effective, compares and uses interpolation precious metal element such as the elements such as Ag, Sc to improve alloy microtexture composition and mechanical property, cost-saving, is easy to realize in the industrial production.
Adopt process Al-Cu-Mg alloy of the present invention, compared with normative heat treatment, mechanical properties at least improves 10%, and anisotropy at least reduces by 10%.
The present invention is applicable to 2x24 aluminium alloy, the conventional Al-Cu-Mg alloy such as 2x22.Wherein Cu content 1.0-6.5%, Mg content 0.5-3.5%, micro-total amount is no more than 1.0%, and impurity element is comprehensively no more than 1.0%, and surplus is Al, the Al-Cu-Mg series alloys such as such as 2024,2124,2022.
Indication aluminium alloy of the present invention can adopt diverse ways to prepare material requested and (or) parts.Creep ageing adopts Chinese patent 2011110209737.0: a kind of metal creep forming die, and this mould is tested.Tensile tests at room makes standard tensile specimen according to GB GB/T228-2002, and stretching experiment carries out on CSS-44100 universal material mechanical stretch machine, and draw speed is 2mm/min.
Below in conjunction with accompanying drawing, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is processing sample schema of the present invention;
Fig. 2 be after process of the present invention after sample optics metallograph, wherein a be sheet material thick to, b be sheet material roll to;
Fig. 3 is alloy <100> zone axis TEM bright field image and electron diffraction pattern photo after different treatment, and wherein a is without process of the present invention, and b is through process of the present invention;
Fig. 4 is alloy <112> zone axis TEM bright field image photo after different treatment, and wherein a is without process of the present invention, through process contrast of the present invention, b is for obviously finding out that strengthening phase S ' precipitation position is mutually different;
Fig. 5 through process alloy different orientation fracture apperance of the present invention, wherein a be sheet material thick to, b be sheet material roll to, c be sheet material wide to.
Embodiment
Be intended to further illustrate the present invention below in conjunction with embodiment, and unrestricted the present invention.
In each embodiment, tensile test at room temperature adopts GB/T228-2002, respectively along sheet material roll to, laterally, thickly carry out application claims process to extracting sample, carry out Mechanics Performance Testing subsequently.And use ultimate tension σ
b, yield strength σ
0.2anisotropic degree is represented with the plane anisotropy index IPA of unit elongation δ.IPA index reference Jata KV, HopkinsA K, Rioja R J.The anisotropy and texture of Al-Li Alloys [J] .Materials ScienceForum, 217-222:647-652.Be defined as: be plane anisotropy index, calculate and press following formula: IPA=(2Xmax-Xmid-Xmin)/2Xmax) × 100%.
As shown in Figure 1, as shown in Figure 2, as shown in Figure 3, stretching fracture pattern as shown in Figure 4 for transmission electron microanalysis result for the metallographic microstructure photo of a certain sample after process of the present invention for the treatment scheme of sample.
Embodiment 1
Shrend after A employing 490 ~ 505 DEG C of solid solution 50min ~ 70min, after quenching, sheet material carries out the preliminary draft process of 210%, and creep ageing temperature chooses 150 DEG C ~ 200 DEG C, and creep time is 2 ~ 12h, and creep stress is 150MPa ~ 300MPa.Within the pre-treatment time should be strict controlled in 4h.
Embodiment 2
Shrend after B employing 490 ~ 505 DEG C of salt bath furnace solid solution 40min ~ 60min, after quenching, sheet material carries out the preliminary draft process of 2-10%, and creep ageing temperature chooses 150 DEG C ~ 200 DEG C, and creep time is 2 ~ 12h, and creep stress is 150MPa ~ 300MPa.Within the pre-treatment time should be strict controlled in 4h.
Embodiment 3
Shrend after C employing 490 ~ 505 DEG C of solid solution 50min ~ 70min, after quenching, sheet material carries out the precompression treatment of 2-10%, and creep ageing temperature chooses 150 DEG C ~ 200 DEG C, and creep time is 2 ~ 12h, and creep stress is 150MPa ~ 300MPa.Within the pre-treatment time should be strict controlled in 4h.
Embodiment 4
Shrend after D employing 490 ~ 505 DEG C of salt bath furnace solid solution 40min ~ 60min, after quenching, sheet material carries out the precompression treatment of 2-10%, and creep ageing temperature chooses 150 DEG C ~ 200 DEG C, and creep time is 2 ~ 12h, and creep stress is 150MPa ~ 300MPa.Within the pre-treatment time should be strict controlled in 4h.
Embodiment 5
After E adopts 490 ~ 505 DEG C of solid solution 50min ~ 70min, roll body stove sprays shrend, and after quenching, sheet material carries out the precompression treatment of 2-10%, and creep ageing temperature chooses 150 DEG C ~ 200 DEG C, and creep time is 2 ~ 12h, and creep stress is 150MPa ~ 300MPa.Within the pre-treatment time should be strict controlled in 4h.
Table one uses the tensile strength of tested alloys 2124 aluminium alloy of the present invention, yield strength, unit elongation and anisotropic index
Claims (3)
1. a creep age forming method for Al-Cu-Mg alloy sheet material, is characterized in that: during the thermal treatment of Al-Cu-Mg alloy sheet material, shrend after solid solution, and after quenching, sheet material carries out the pre-treatment of 2-10%, then creep; Pre-treatment time controling is within 4h, described pre-treatment is preliminary draft or precompression, the mode of solid solution, shrend comprises: adopt shrend after 490 ~ 505 DEG C of solid solution 50min ~ 70min, or adopts shrend after 490 ~ 505 DEG C of salt bath furnace solid solution 40min ~ 60min.
2. method according to claim 1, is characterized in that, creep ageing temperature chooses 150 DEG C ~ 200 DEG C, and creep time is 2 ~ 12h, and creep stress is 150MPa ~ 300MPa.
3. method according to claim 1, is characterized in that, Al-Cu-Mg alloy sheet metal thickness is 2mm ~ 80mm.
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| CN 201210350927 CN102912268A (en) | 2012-09-20 | 2012-09-20 | Creep aging forming method for Al-Cu-Mg series alloy sheet material |
| CN201310074621.XA CN103422035B (en) | 2012-09-20 | 2013-03-09 | A kind of creep age forming method for Al-Cu-Mg alloy sheet material |
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| CN104164599A (en) * | 2013-05-17 | 2014-11-26 | 中国石油天然气集团公司 | Method for improving thermal stability and fatigue resistance of Al-Cu-Mg-Yb alloy for aluminum alloy drill rod |
| CN103924173B (en) * | 2014-05-13 | 2016-04-20 | 中南大学 | The multistage creep age forming method of a kind of Al-Cu-Mg line aluminium alloy sheet material |
| CN104388857B (en) * | 2014-10-21 | 2017-10-27 | 西北工业大学 | A kind of Al Zn Mg Cu line aluminium alloy sheet materials overaging solid solution creep age forming method again |
| CN104404414B (en) * | 2014-12-09 | 2018-07-24 | 中南大学 | A kind of 7075 aluminum alloy plate materials creep age forming methods |
| CN105779748A (en) * | 2014-12-24 | 2016-07-20 | 北京有色金属研究总院 | Aging strengthened alloy ring creep aging shape correcting method |
| CN108486508B (en) * | 2018-02-07 | 2020-09-01 | 中南大学 | Efficient creep age forming method for aluminum alloy |
| CN108754364A (en) * | 2018-09-04 | 2018-11-06 | 钦州学院 | A kind of method of Ω phases Precipitation in Al-Cu-Mg alloy |
| CN109214104B (en) * | 2018-09-26 | 2022-12-20 | 中南大学 | Method for predicting creep aging behavior of aluminum-copper alloy under variable stress |
| CN109487186B (en) * | 2018-12-28 | 2021-02-02 | 中南大学 | Method for shape/performance collaborative optimization of creep age forming aluminum alloy component |
| CN112981284B (en) * | 2021-02-09 | 2022-04-05 | 北京理工大学 | Preparation method of stress-aging-state high-strength aluminum-lithium alloy |
| CN113088841B (en) * | 2021-04-01 | 2022-06-03 | 中南大学 | Method for regulating and controlling creep anisotropy of cold-rolled pre-deformation alloy |
| CN113249665A (en) * | 2021-07-02 | 2021-08-13 | 中国航发北京航空材料研究院 | Forming method of aluminum alloy component |
| CN115896654A (en) * | 2022-12-19 | 2023-04-04 | 湖南中创空天新材料股份有限公司 | Heat treatment method for rapidly obtaining natural aging mechanical property of aluminum alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3005354B2 (en) * | 1992-02-07 | 2000-01-31 | トヨタ自動車株式会社 | Heat treatment method of Al powder alloy |
| CN101705403A (en) * | 2009-11-24 | 2010-05-12 | 苏州有色金属研究院有限公司 | High-strength and high-fracture toughness Al-Cu-Mg alloy for aviation and processing method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3005354B2 (en) * | 1992-02-07 | 2000-01-31 | トヨタ自動車株式会社 | Heat treatment method of Al powder alloy |
| CN101705403A (en) * | 2009-11-24 | 2010-05-12 | 苏州有色金属研究院有限公司 | High-strength and high-fracture toughness Al-Cu-Mg alloy for aviation and processing method thereof |
Non-Patent Citations (1)
| Title |
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| 预处理对2124铝合金板材蠕变时效微结构与力学性能的影响;周亮等;《材料工程》;20100228(第2期);第81-82页 * |
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