CN112048685A - Post-treatment method capable of improving fatigue resistance of aluminum alloy - Google Patents
Post-treatment method capable of improving fatigue resistance of aluminum alloy Download PDFInfo
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- CN112048685A CN112048685A CN202010961254.5A CN202010961254A CN112048685A CN 112048685 A CN112048685 A CN 112048685A CN 202010961254 A CN202010961254 A CN 202010961254A CN 112048685 A CN112048685 A CN 112048685A
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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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- 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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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Abstract
The invention discloses a post-treatment method capable of improving fatigue resistance of an aluminum alloy, which comprises the steps of treating the aluminum alloy at-30 to-25 ℃, 50 to-45 ℃ and-65 to-60 ℃ respectively by adopting a step-by-step cooling and step-by-step rolling method, then rapidly heating to 150 to 180 ℃ within 20 to 30min for rapid heating treatment, and finally carrying out cooling and aging treatment. The mode of gradual cooling, gradual low-temperature rolling, rapid heat treatment and cooling aging treatment can effectively improve the fatigue resistance of the Al-Zn-Mg-Cu (7000) alloy.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to a post-treatment method capable of improving fatigue resistance of aluminum alloy.
Background
The 7-series aluminum alloy is an important series of aluminum alloys, belongs to aluminum-magnesium-zinc-copper alloy, is a super-hard aluminum alloy capable of being subjected to heat treatment, and has good wear resistance and corrosion resistance, so the 7-series aluminum alloy is widely applied to the aerospace industry. With the development of science and technology, the hardness requirement of the series of alloys is higher and higher, and the conventional high-strength and high-hardness aluminum alloy cannot meet the industrial requirement. On the other hand, in the conventional manufacturing process of aluminum alloy, the strength and the quenching residual stress of the 7-series aluminum alloy are a pair of contradictory performance indexes, and quenching is carried out by using high cooling strength in order to obtain high strength, but the cooling strength is large, so that the distribution of the quenching residual stress is not uniform, the strength of the alloy is increased with the further increase of the cooling strength, but the quenching residual stress is also remarkably increased, and the existence of the quenching residual stress causes the subsequent machining deformation of the extruded plate, the machining precision is poor, and the stress corrosion resistance and the fatigue resistance are influenced.
The Chinese invention patent CN110029297A discloses an aluminum alloy and a method for processing the aluminum alloy after quenching, the method can effectively improve the strength performance of the plate while eliminating the quenching residual stress by repeatedly rolling in a deep cooling/rapid heating state, and simultaneously, after the rolling is finished, the subsequent deep cooling, rapid heating and cooling aging treatment are matched, so that the quenching residual stress can be effectively stabilized, the strength performance of the plate is further improved, and compared with the existing aluminum alloy material, the method can obviously reduce the quenching residual stress and also obviously improve the strength of the aluminum alloy. However, this method requires immersing the aluminum alloy in low-temperature liquid nitrogen for cooling, and also requires many times of heat and cold exchanges, and the energy consumption in the whole process is very large, so in order to reduce the cost, it is necessary to develop a post-treatment method capable of improving the fatigue resistance of the aluminum alloy.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a post-treatment method capable of improving the fatigue resistance of aluminum alloy.
The technical scheme of the invention is as follows:
a post-treatment method capable of improving fatigue resistance of aluminum alloy comprises the following steps:
A. putting the aluminum alloy plate after quenching treatment into a refrigeration house, and slowly cooling the central temperature of the plate from room temperature to-30 to-25 ℃ within 2-3 h; keeping the temperature at minus 30 to minus 25 ℃, keeping the temperature for 3 to 5 hours, and rolling at the temperature;
B. slowly reducing the central temperature of the plate to-50 to-45 ℃ within 3-5 h; keeping the temperature at minus 50 to minus 45 ℃ and keeping the temperature for 2 to 3 hours, and rolling at the temperature;
C. slowly reducing the central temperature of the plate to-65 to-60 ℃ within 5-8 h; keeping the temperature at-65 to-60 ℃ and the heat preservation time at 18 to 24 hours, and rolling at the temperature;
D. rapidly raising the central temperature of the plate to 150-180 ℃ within 20-30 min, and preserving heat for 3-5 h;
E. and (3) cooling and aging the plate, and preserving for 3-5 days.
Preferably, in the step A, rolling is carried out at a rolling speed of 8mm/s, and the rolling reduction is controlled to be 8-10%.
Preferably, in the step B, rolling is performed at a rolling speed of 5mm/s, and the rolling reduction is controlled to be 5-6%.
Preferably, in the step C, rolling is carried out at a rolling speed of 3mm/s, and the rolling reduction is controlled to be 2-3%.
Preferably, in the step E, the plate is subjected to cooling aging treatment at a cooling speed of 5-8 ℃/h.
The invention has the advantages that: the post-treatment method capable of improving the fatigue resistance of the aluminum alloy adopts a step-by-step cooling and step-by-step rolling method, the aluminum alloy is treated at-30 to-25 ℃, 50 to-45 ℃ and-65 to-60 ℃, then rapidly heated to 150 to 180 ℃ within 20 to 30min for rapid heating treatment, and finally cooled and aged. The mode of gradual cooling, gradual low-temperature rolling, rapid heat treatment and cooling aging treatment can effectively improve the fatigue resistance of the Al-Zn-Mg-Cu (7000) alloy.
Detailed Description
Example 1
A post-treatment method capable of improving fatigue resistance of aluminum alloy comprises the following steps:
A. putting the aluminum alloy plate after quenching treatment into a refrigeration house, and slowly cooling the central temperature of the plate from room temperature to-28 ℃ within 2.5 h; keeping the temperature at-28 ℃ for 3.5h, rolling at the temperature at the rolling speed of 8mm/s, and controlling the rolling reduction rate to be 8.5%;
B. slowly reducing the central temperature of the plate to-48 ℃ within 4 h; keeping the temperature at-48 ℃ for 2.5h, rolling at the temperature at the rolling speed of 5mm/s, and controlling the rolling reduction rate to be 5.8%;
C. slowly reducing the central temperature of the plate to-62 ℃ within 6 h; keeping the temperature at-62 ℃, keeping the temperature for 22h, rolling at the temperature at the rolling speed of 3mm/s, and controlling the rolling reduction rate to be 2.5%;
D. rapidly raising the central temperature of the plate to 175 ℃ within 25min, and keeping the temperature for 3.5 h;
E. and (3) carrying out cooling aging treatment on the plate at a cooling speed of 6 ℃/h, and storing for 4 days.
Example 2
A post-treatment method capable of improving fatigue resistance of aluminum alloy comprises the following steps:
A. putting the aluminum alloy plate after quenching treatment into a refrigeration house, and slowly cooling the central temperature of the plate from room temperature to-30 ℃ within 3 h; keeping the temperature at-30 ℃ for 3h, rolling at the temperature at the rolling speed of 8mm/s, and controlling the rolling reduction rate to be 8%;
B. slowly reducing the central temperature of the plate to-45 ℃ within 5 h; keeping the temperature at minus 45 ℃ and the heat preservation time at 3h, rolling at the temperature at the rolling speed of 5mm/s, and controlling the rolling reduction rate at 6%;
C. slowly reducing the central temperature of the plate to-65 ℃ within 8 h; keeping the temperature at-65 ℃ for 18h, rolling at the temperature at the rolling speed of 3mm/s, and controlling the rolling reduction rate to be 2%;
D. rapidly raising the central temperature of the plate to 150 ℃ within 30min, and keeping the temperature for 5 h;
E. and (3) carrying out cooling aging treatment on the plate at a cooling speed of 5 ℃/h, and storing for 3 days.
Example 3
A post-treatment method capable of improving fatigue resistance of aluminum alloy comprises the following steps:
A. putting the aluminum alloy plate after quenching treatment into a refrigeration house, and slowly cooling the central temperature of the plate from room temperature to-25 ℃ within 2 h; keeping the temperature at-25 ℃, keeping the temperature for 5h, rolling at the temperature at the rolling speed of 8mm/s, and controlling the rolling reduction rate to be 10%;
B. slowly reducing the central temperature of the plate to-50 ℃ within 3 h; keeping the temperature at minus 50 ℃, keeping the temperature for 2h, rolling at the temperature at the rolling speed of 5mm/s, and controlling the rolling reduction rate to be 5%;
C. slowly reducing the central temperature of the plate to-60 ℃ within 5 h; keeping the temperature at-60 ℃, keeping the temperature for 24h, rolling at the temperature at the rolling speed of 3mm/s, and controlling the rolling reduction rate to be 3%;
D. rapidly raising the central temperature of the plate to 180 ℃ within 20min, and keeping the temperature for 3 h;
E. and (3) carrying out cooling aging treatment on the plate at a cooling speed of 8 ℃/h, and storing for 5 days.
Comparative example 1
And (3) carrying out conventional artificial aging treatment to obtain the aluminum alloy.
Comparative example 2
And (4) eliminating the step-by-step cooling in the steps A-C, and directly carrying out deep cooling rolling at the temperature of-65 ℃ without changing the steps D and E to obtain the aluminum alloy.
Comparative example 3: the aluminum alloy is obtained by adopting the process of the embodiment 3 of the invention patent CN 110029297A.
The following tests were conducted on the aluminum alloys prepared in examples 1 to 3 and comparative examples 1 to 3, and the following test results were obtained, and specific results are shown in Table 1.
Table 1: the aluminum alloys prepared in examples 1 to 3 and comparative examples 1 to 3 were examined;
the test results show that the post-treatment method can effectively improve the fatigue resistance of the aluminum alloy.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The post-treatment method capable of improving the fatigue resistance of the aluminum alloy is characterized by comprising the following steps of:
A. putting the aluminum alloy plate after quenching treatment into a refrigeration house, and slowly cooling the central temperature of the plate from room temperature to-30 to-25 ℃ within 2-3 h; keeping the temperature at minus 30 to minus 25 ℃, keeping the temperature for 3 to 5 hours, and rolling at the temperature;
B. slowly reducing the central temperature of the plate to-50 to-45 ℃ within 3-5 h; keeping the temperature at minus 50 to minus 45 ℃ and keeping the temperature for 2 to 3 hours, and rolling at the temperature;
C. slowly reducing the central temperature of the plate to-65 to-60 ℃ within 5-8 h; keeping the temperature at-65 to-60 ℃ and the heat preservation time at 18 to 24 hours, and rolling at the temperature;
D. rapidly raising the central temperature of the plate to 150-180 ℃ within 20-30 min, and preserving heat for 3-5 h;
E. and (3) cooling and aging the plate, and preserving for 3-5 days.
2. The post-treatment method for improving fatigue resistance of aluminum alloy as claimed in claim 1, wherein in step A, rolling is performed at a rolling speed of 8mm/s, and the rolling reduction is controlled to be 8-10%.
3. The post-treatment method for improving fatigue resistance of aluminum alloy as claimed in claim 1, wherein in step B, rolling is performed at a rolling speed of 5mm/s, and the rolling reduction is controlled to be 5-6%.
4. The method of post-treatment for improving fatigue resistance of aluminum alloy as claimed in claim 1, wherein in step C, rolling is performed at a rolling rate of 3mm/s, and the rolling reduction is controlled to be 2-3%.
5. The post-treatment method for improving the fatigue resistance of aluminum alloy as claimed in claim 1, wherein in the step E, the plate is subjected to temperature reduction aging treatment at a temperature reduction rate of 5-8 ℃/h.
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| CN202010961254.5A CN112048685B (en) | 2020-09-14 | 2020-09-14 | Post-treatment method capable of improving fatigue resistance of aluminum alloy |
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| CN202010961254.5A CN112048685B (en) | 2020-09-14 | 2020-09-14 | Post-treatment method capable of improving fatigue resistance of aluminum alloy |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0413907A1 (en) * | 1989-08-25 | 1991-02-27 | Sumitomo Light Metal Industries Limited | Method of producing hardened aluminum alloy sheets having superior corrosion resistance |
| CN109457198A (en) * | 2018-11-16 | 2019-03-12 | 中南大学 | A kind of aluminum alloy materials and preparation method thereof of the anti-corrosion low stress of superhigh intensity |
| CN110029297A (en) * | 2019-05-17 | 2019-07-19 | 广东和胜工业铝材股份有限公司 | Aluminum alloy and quenching post-treatment method thereof |
| CN110964957A (en) * | 2019-12-26 | 2020-04-07 | 北京工业大学 | Cryogenic rolling and aging treatment process for high-strength Al-Zn-Mg alloy |
-
2020
- 2020-09-14 CN CN202010961254.5A patent/CN112048685B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0413907A1 (en) * | 1989-08-25 | 1991-02-27 | Sumitomo Light Metal Industries Limited | Method of producing hardened aluminum alloy sheets having superior corrosion resistance |
| CN109457198A (en) * | 2018-11-16 | 2019-03-12 | 中南大学 | A kind of aluminum alloy materials and preparation method thereof of the anti-corrosion low stress of superhigh intensity |
| CN110029297A (en) * | 2019-05-17 | 2019-07-19 | 广东和胜工业铝材股份有限公司 | Aluminum alloy and quenching post-treatment method thereof |
| CN110964957A (en) * | 2019-12-26 | 2020-04-07 | 北京工业大学 | Cryogenic rolling and aging treatment process for high-strength Al-Zn-Mg alloy |
Non-Patent Citations (4)
| Title |
|---|
| 侯陇刚 等: "高强7050铝合金超低温大变形加工与组织、性能调控", 《金属学报》 * |
| 汪波: "晶粒尺寸和残余应力对2E12铝合金疲劳性能的影响", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑第2期》 * |
| 王秋成: "航空铝合金残余应力消除及评估技术研究", 《中国博士学位论文全文数据库工程科技Ⅱ辑第07期》 * |
| 苑世剑: "《精密热加工新技术》", 31 May 2016, 国防工业出版社 * |
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