CN109055794B - T7X heat treatment method for high-strength aluminum alloy rivet - Google Patents
T7X heat treatment method for high-strength aluminum alloy rivet Download PDFInfo
- Publication number
- CN109055794B CN109055794B CN201811171875.2A CN201811171875A CN109055794B CN 109055794 B CN109055794 B CN 109055794B CN 201811171875 A CN201811171875 A CN 201811171875A CN 109055794 B CN109055794 B CN 109055794B
- Authority
- CN
- China
- Prior art keywords
- rivet
- treatment
- aging
- temperature
- quenching
- 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.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
-
- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
Abstract
The invention discloses a T7X heat treatment method of a high-strength aluminum alloy rivet, belongs to the technical field of aluminum alloy heat treatment, and can be applied to heat treatment of aluminum alloy rivets for aviation. The process technology of the invention comprises the following steps: the invention improves the traditional T73 heat treatment system through solution treatment, quenching, cold-hot circulation and aging. The reasons for the problems of defective shear properties and cracking of the rivet are the high internal stress of the rivet and the reduced toughness of the rivet after it has attained high strength. In order to reduce the quenching stress of the rivet and improve the riveting performance, the invention adopts the organic solvent quenching liquid, increases the temperature of the quenching liquid from the traditional room temperature to 40-50 ℃, and adds a cold-hot circulating treatment process. In order to obtain the dispersion and refinement distribution of the precipitated phase in the crystal and the intermittent spheroidization distribution of the crystal boundary precipitated phase, the invention adopts a three-stage aging process, thereby improving the matching relationship between the performance and the toughness of the rivet; a T7X heat treatment schedule suitable for the high-strength aluminum alloy rivet is obtained.
Description
Technical Field
The invention discloses a T7X heat treatment method of a high-strength aluminum alloy rivet, belongs to the technical field of aluminum alloy heat treatment, and can be applied to heat treatment of aluminum alloy rivets for aviation.
Background
The high-strength aluminum alloy rivets are widely applied to the field of aerospace, and the weight reduction, high reliability and maintainability of the structure are realized. The rivet needs to be subjected to heat treatment after the pier head is formed, and the riveting procedure is performed after the heat treatment. The heat treatment process is an important process for determining the mechanical property and the riveting forming property of the rivet, and the phenomenon of riveting cracking is easily caused by improper treatment. At present, a special heat treatment system aiming at the high-strength aluminum alloy rivet is lacked in China, and the existing T73 heat treatment system is as follows: solid solution temperature: water quenching at room temperature at 471-482 ℃; two-stage aging is 121 ℃ (4 h-24 h) +177 ℃ (6 h-12 h), and the temperature rises along with the furnace between the first-stage aging and the second-stage aging. The heat treatment system has the phenomena of unqualified shearing performance and riveting cracking of rivet parts.
Disclosure of Invention
The invention designs a special method for T7X heat treatment of a high-strength aluminum alloy rivet aiming at the defect that the riveting performance in the existing heat treatment process cannot meet the use requirement, and aims to ensure that the mechanical property and the riveting forming performance of the rivet are well matched.
The purpose of the invention is realized by the following technical scheme:
the process technology comprises the following steps: solid solution, quenching, cold-hot circulation and aging, which is characterized in that,
(1) solution treatment: the solid solution treatment temperature of the rivet is 471-482 ℃;
(2) quenching: the quenching liquid is 20 to 30 percent of polyethylene glycol organic solvent, and the temperature is 40 to 50 ℃;
(3) and (3) cold-hot circulation treatment: after quenching, 2 times of cold-hot circulation treatment and 1 st time of cold-hot circulation treatment are adopted: the subzero treatment temperature is-180 ℃, the heat preservation time is 5 hours, then the aging treatment is carried out, the aging temperature is 120 ℃, and the heat preservation time is 5 hours; and (3) carrying out cold and hot circulation treatment for the 2 nd time: the subzero treatment temperature is-150 ℃, and the heat preservation time is 3 hours;
(4) aging treatment: adopting a three-stage aging process for treatment, wherein the temperature of the first-stage aging is 120 ℃, and keeping the temperature for 5 hours; slowly heating from the first-stage aging to the second-stage aging at a heating speed of 15-20 ℃/h; secondary aging: the aging temperature is 160-170 ℃, the heat preservation time phi is 3-6 mm: 3 h; and (3) increasing the temperature from the second-stage aging to the third-stage aging: heating along with the furnace; and (3) tertiary aging: aging temperature is 175-185 ℃, and heat preservation time is phi 3-phi 4 mm: 2 h-3 h; phi 5 mm-phi 6 mm: 4-5 h.
The quenching method in the second step comprises the following specific steps: after the rivet is taken out of the furnace through solution treatment, immediately putting the rivet into quenching liquid at the temperature of 40-50 ℃, wherein the quenching transfer time is not more than 15s, and the quenching liquid is 20-30% of polyethylene glycol organic solvent; and vertically shaking in a quenching tank for 10-15 min until the temperature of the rivet is consistent with that of the quenching liquid.
The specific method of the 2-time cold-hot circulation treatment in the third step is as follows:
1, time: placing the quenched rivet into a deep cooling box at minus 180 ℃ immediately for cryogenic treatment, keeping the temperature for 5 hours, discharging the rivet from the deep cooling box, and immediately transferring the rivet into an aging furnace at 120 ℃ for aging treatment, wherein the aging and heat preservation time is 5 hours;
and 2, time: and immediately placing the aged rivet into a cryogenic box at-150 ℃ for cryogenic treatment, and keeping the temperature for 3 hours.
The invention has the advantages that: the invention improves the traditional T73 heat treatment system. The reasons for the problems of defective shear properties and cracking of the rivet are the high internal stress of the rivet and the reduced toughness of the rivet after it has attained high strength. In order to reduce the quenching stress of the rivet and improve the riveting performance, the invention adopts the organic solvent quenching liquid, increases the temperature of the quenching liquid from the traditional room temperature to 40-50 ℃, and adds a cold-hot circulating treatment process. In order to obtain the dispersion and refinement distribution of the precipitated phase in the crystal and the intermittent spheroidization distribution of the crystal boundary precipitated phase, the invention adopts a three-stage aging process, thereby improving the matching relationship between the performance and the toughness of the rivet; a T7X heat treatment schedule suitable for the high-strength aluminum alloy rivet is obtained.
The invention develops heat treatment process researches such as solid solution, quenching, cold and hot circulation treatment, aging and the like for the high-strength aluminum alloy rivet, and obtains the best heat treatment process method of the high-strength aluminum alloy rivet T7X through the test and verification of multiple batches of rivets, thereby realizing the good matching of the mechanical property and the riveting forming property of the rivet.
Detailed Description
The technical solution of the present invention will be further described with reference to the following examples:
example (b):
(1) the high-strength aluminum alloy rivet with the specification of phi 5mm is selected, and the mechanical property, the riveting forming property and the like obtained by adopting the T7X heat treatment system meet the requirements. The results are shown in Table 1.
TABLE 1
(2) The high-strength aluminum alloy rivets with the specifications of phi 3mm, phi 4mm, phi 5mm and phi 6mm are selected, secondary and tertiary aging parameters are adopted, the solid solution temperature is 475 ℃, 20-30% polyglycol solution with the temperature of 40-50 ℃ is adopted as quenching liquid, and the obtained test results of mechanical property, riveting forming property and the like meet the design requirements. The results are shown in Table 2.
TABLE 2
Comparative example:
table 3 shows the mechanical property results and the riveting forming results of the heat treatment of the rivet according to the parameters of the T73 process in the prior art, and the phenomenon of unqualified shear strength or cracking of the riveting forming occurs after the heat treatment.
TABLE 3
Claims (3)
1. A T7X heat treatment method for a high-strength aluminum alloy rivet comprises the following steps: solid solution, quenching, cold-hot circulation and aging, which is characterized in that,
(1) solution treatment: the solid solution treatment temperature of the rivet is 471-482 ℃;
(2) quenching: the quenching liquid is 20 to 30 percent of polyethylene glycol organic solvent, and the temperature is 40 to 50 ℃;
(3) and (3) cold-hot circulation treatment: after quenching, 2 times of cold-hot circulation treatment and 1 st time of cold-hot circulation treatment are adopted: the subzero treatment temperature is-180 ℃, the heat preservation time is 5 hours, then the aging treatment is carried out, the aging temperature is 120 ℃, and the heat preservation time is 5 hours; and (3) carrying out cold and hot circulation treatment for the 2 nd time: the subzero treatment temperature is-150 ℃, and the heat preservation time is 3 hours;
(4) aging treatment: adopting a three-stage aging process for treatment, wherein the temperature of the first-stage aging is 120 ℃, and keeping the temperature for 5 hours; slowly heating from the first-stage aging to the second-stage aging at a heating speed of 15-20 ℃/h; secondary aging: the aging temperature is 160-170 ℃, the heat preservation time phi is 3-6 mm: 3 h; and (3) increasing the temperature from the second-stage aging to the third-stage aging: heating along with the furnace; and (3) tertiary aging: aging temperature is 175-185 ℃, and heat preservation time is phi 3-phi 4 mm: 2 h-3 h; phi 5 mm-phi 6 mm: 4-5 h.
2. The method for T7X heat treatment of a high-strength aluminum alloy rivet according to claim 1, wherein; and a second step of quenching, which comprises the following specific steps: after the rivet is taken out of the furnace through solution treatment, immediately putting the rivet into quenching liquid at the temperature of 40-50 ℃, wherein the quenching transfer time is not more than 15s, and the quenching liquid is 20-30% of polyethylene glycol organic solvent; and vertically shaking in a quenching tank for 10-15 min until the temperature of the rivet is consistent with that of the quenching liquid.
3. The T7X heat treatment method for the high-strength aluminum alloy rivet according to claim 1, wherein: step three, 2 times of cold and hot circulation treatment, which comprises the following specific steps:
1, time: placing the quenched rivet into a deep cooling box at minus 180 ℃ immediately for cryogenic treatment, keeping the temperature for 5 hours, discharging the rivet from the deep cooling box, and immediately transferring the rivet into an aging furnace at 120 ℃ for aging treatment, wherein the aging and heat preservation time is 5 hours;
and 2, time: and immediately placing the aged rivet into a cryogenic box at-150 ℃ for cryogenic treatment, and keeping the temperature for 3 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811171875.2A CN109055794B (en) | 2018-10-09 | 2018-10-09 | T7X heat treatment method for high-strength aluminum alloy rivet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811171875.2A CN109055794B (en) | 2018-10-09 | 2018-10-09 | T7X heat treatment method for high-strength aluminum alloy rivet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109055794A CN109055794A (en) | 2018-12-21 |
| CN109055794B true CN109055794B (en) | 2020-06-30 |
Family
ID=64763678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811171875.2A Active CN109055794B (en) | 2018-10-09 | 2018-10-09 | T7X heat treatment method for high-strength aluminum alloy rivet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109055794B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029297B (en) * | 2019-05-17 | 2020-04-24 | 广东和胜工业铝材股份有限公司 | Aluminum alloy and quenching post-treatment method thereof |
| CN110952047A (en) * | 2019-11-28 | 2020-04-03 | 湖南恒佳新材料科技有限公司 | Heat treatment process for high-quality aluminum alloy material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104726656A (en) * | 2013-12-20 | 2015-06-24 | 北京有色金属研究总院 | Water-soluble quenching medium for aluminum alloy precision part |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7435306B2 (en) * | 2003-01-22 | 2008-10-14 | The Boeing Company | Method for preparing rivets from cryomilled aluminum alloys and rivets produced thereby |
| US7241328B2 (en) * | 2003-11-25 | 2007-07-10 | The Boeing Company | Method for preparing ultra-fine, submicron grain titanium and titanium-alloy articles and articles prepared thereby |
| CN103628007A (en) * | 2013-12-03 | 2014-03-12 | 葛鹏 | New method for eliminating aluminium alloy workpiece residual stress |
| CN106319404A (en) * | 2015-06-18 | 2017-01-11 | 张家港市丰乐汽车设备有限公司 | Three stage aging heat treatment method for aluminum alloy |
| CN106498245B (en) * | 2016-10-09 | 2018-04-24 | 江苏大学 | The high-strength cast aluminum-silicon alloy and its preparation process that a kind of subzero treatment is strengthened |
| CN108149172B (en) * | 2017-12-26 | 2019-11-01 | 湖南科技大学 | A kind of processing method of fine grain cubic texture corrosion fatigue resistant aluminum alloy plate materials |
-
2018
- 2018-10-09 CN CN201811171875.2A patent/CN109055794B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104726656A (en) * | 2013-12-20 | 2015-06-24 | 北京有色金属研究总院 | Water-soluble quenching medium for aluminum alloy precision part |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109055794A (en) | 2018-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101838785B (en) | Post weld vacuum heat treatment process of TC18 titanium alloy welding component | |
| CN102641978B (en) | Method for processing TC18 titanium alloy large-sized section bar | |
| CN102796973B (en) | Multistage aging treatment method for improving microstructure and comprehensive performance of 7xxx series aluminum alloy | |
| CN103343200B (en) | Short-process thermal treatment method of large 35CrNi3MoV steel forgings | |
| CN108018509B (en) | Thermomechanical treatment method for improving mechanical property of aluminum alloy rolled plate | |
| US20150376754A1 (en) | Methods for artificially aging aluminum-zinc-magnesium alloys, and products based on the same | |
| CN106480384B (en) | A kind of milling method of ultrahigh-strength aluminum alloy sheet material | |
| CN109055794B (en) | T7X heat treatment method for high-strength aluminum alloy rivet | |
| CN101956151A (en) | Heat treatment technology of high strength aluminium alloy | |
| CN110592508B (en) | Low-cost and high-performance titanium alloy short-process forging process | |
| CN104694863B (en) | A kind of heat treatment method of titanium alloy | |
| CN104561857A (en) | Two-step aging heat treatment technology for aluminum alloy | |
| CN107090569A (en) | Prepare the Technology for Heating Processing of high-strength hard aluminum alloy | |
| CN103305780A (en) | Heat treatment method for aerial aluminum alloy | |
| CN106238641B (en) | A kind of forging method of passenger car aluminium alloy chaining part | |
| CN103695820A (en) | Forging and heat treatment process of 7050 aluminum alloy | |
| CN109487184A (en) | A kind of artificial aging state high strength alumin ium alloy recurrence forming synchronous process | |
| CN109735750A (en) | A kind of the Al-Zn-Mg-Cu-Er-Zr alloy and its preparation process of high strength anti-corrosion | |
| CN110684885B (en) | Forging control method for uniformly refining grain size of forge piece | |
| CN103668017A (en) | Forging and heat treatment process for aero-engine aluminium alloy vane | |
| CN103572181A (en) | Thermal treatment method of lowering stress for spraying and forming 7055 aluminum alloy forged piece | |
| CN105861968A (en) | Method for improving mechanical property of Al-Cu-series high-strength aluminum alloy ring pieces | |
| CN105648172A (en) | Heat treatment process method for 0Cr13Ni8Mo2Al steel | |
| CN108277445B (en) | Heat treatment method of 7075 aluminum alloy blind rivet body | |
| CN110551953A (en) | High strength aluminothermic stamping with intermediate quench |
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 |