CN111500951A - Homogenization heat treatment process of 7050 alloy ingot - Google Patents
Homogenization heat treatment process of 7050 alloy ingot Download PDFInfo
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- CN111500951A CN111500951A CN202010493829.5A CN202010493829A CN111500951A CN 111500951 A CN111500951 A CN 111500951A CN 202010493829 A CN202010493829 A CN 202010493829A CN 111500951 A CN111500951 A CN 111500951A
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- alloy ingot
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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
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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
- C21D9/70—Furnaces for ingots, i.e. soaking pits
Abstract
The invention discloses a homogenization heat treatment process of a 7050 alloy ingot, which comprises the following steps: s1: primary heating is carried out on the 7050 alloy ingot, the primary heating temperature is 400-410 ℃, and the temperature is kept for 9.5-10.5 hours; s2: and (3) carrying out secondary heating on the 7050 alloy ingot, wherein the secondary heating temperature is 472-. The 7050 alloy ingot is subjected to primary heating and secondary heating, so that precipitated phases in the 7050 alloy ingot can be fully dissolved. In addition, the secondary heating temperature is high, and the heating time is short, so that the precipitated phase in the 7050 alloy ingot can be further promoted to be fully dissolved. The homogenization heat treatment process can ensure sufficient redissolution of precipitated phases in the 7050 alloy ingot, reduce cracking sources and improve the fracture toughness of the 7050 alloy ingot.
Description
Technical Field
The invention relates to the technical field of 7050 alloy, in particular to a homogenization heat treatment process for 7050 alloy cast ingots.
Background
7050 the alloy material is widely used for manufacturing aerospace vehicles. With the extension of the design ideas of long service life, safety, economy and maintainability of modern aerospace aircrafts, higher requirements are put on the damage tolerance of metal structural materials. On the other hand, during the casting process of the 7050 alloy, some primary solidification precipitated phases are inevitably generated, and if the precipitated phases cannot be fully dissolved back, the precipitated phases are remained in the final material to become a cracking source, so that the fracture toughness of the material is seriously influenced.
Therefore, how to ensure sufficient re-dissolution of precipitated phases in the 7050 alloy ingot, so as to reduce cracking sources and improve the fracture toughness of the 7050 alloy ingot is a critical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a homogenization heat treatment process of a 7050 alloy ingot, so that the sufficient redissolution of precipitated phases in the 7050 alloy ingot is ensured, cracking sources are reduced, and the fracture toughness of the 7050 alloy ingot is improved. In order to achieve the purpose, the invention provides the following technical scheme:
a homogenization heat treatment process of a 7050 alloy ingot comprises the following steps:
s1: primary heating is carried out on the 7050 alloy ingot, the primary heating temperature is 400-410 ℃, and the temperature is kept for 9.5-10.5 hours;
s2: and (3) carrying out secondary heating on the 7050 alloy ingot, wherein the secondary heating temperature is 472-.
Preferably, the holding time of the primary heating is 10 hours.
Preferably, the holding time of the secondary heating is 45 hours.
Preferably, the primary heating and the secondary heating are performed in a closed space.
Preferably, the primary heating and the secondary heating are performed in an electrically heated air circulating furnace.
Preferably, the primary heating to the secondary heating is a gradual temperature rise transition.
Preferably, the temperature rising rate of the temperature rising is less than or equal to 5 ℃/hour.
According to the technical scheme, the 7050 alloy ingot is subjected to primary heating and secondary heating, so that precipitated phases in the 7050 alloy ingot can be fully dissolved. In addition, the secondary heating temperature is high, and the heating time is short, so that the precipitated phase in the 7050 alloy ingot can be further promoted to be fully dissolved. The homogenization heat treatment process can ensure sufficient redissolution of precipitated phases in the 7050 alloy ingot, reduce cracking sources and improve the fracture toughness of the 7050 alloy ingot.
Drawings
In order to more clearly illustrate the solution of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive efforts.
Fig. 1 is a flow chart of a homogenization heat treatment process for a 7050 alloy ingot according to an embodiment of the present invention;
FIG. 2 is a high magnification texture metallographic image of an ingot of 7050 alloy according to an embodiment of the prior art;
fig. 3 is a high-magnification-structure metallographic image of an ingot of 7050 alloy according to an embodiment of the present invention.
Detailed Description
The invention discloses a homogenization heat treatment process of a 7050 alloy ingot, which ensures sufficient redissolution of precipitated phases in the 7050 alloy ingot, reduces cracking sources and improves the fracture toughness of the 7050 alloy ingot
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment of the invention, the homogenization heat treatment process of the 7050 alloy ingot comprises the following steps:
s1: primary heating is carried out on the 7050 alloy ingot, the primary heating temperature is 400-410 ℃, and the temperature is kept for 9.5-10.5 hours.
S2: and (3) carrying out secondary heating on the 7050 alloy ingot, wherein the secondary heating temperature is 472-.
In this example, the primary heating and the secondary heating were performed on the 7050 alloy ingot, so that the precipitated phase in the 7050 alloy ingot could be sufficiently redissolved. In addition, the secondary heating temperature of the present example is high, and the heating time is short, so that the precipitated phase in the 7050 alloy ingot can be further promoted to be sufficiently re-dissolved. The homogenization heat treatment process can ensure sufficient redissolution of precipitated phases in the 7050 alloy ingot, reduce cracking sources and improve the fracture toughness of the 7050 alloy ingot.
Further, the holding time of the primary heating is preferably 10 hours. The 10-hour period can ensure that the 7050 alloy ingot is fully redissolved at the temperature of 400-410 ℃.
Further, the holding time of the secondary heating is preferably 45 hours. The alloy ingot of 7050 can be fully dissolved at the temperature of 472 ℃ and 478 ℃ within 45 hours.
It should be noted that the primary heating and the secondary heating are both performed in a closed space, so as to avoid the influence of the outside on the quality of the 7050 alloy ingot.
Further, both the primary heating and the secondary heating are performed in an electrically heated air circulating furnace. The electric heating air circulating furnace can provide a closed space for the 7050 alloy ingot, and is simple to operate and high in heating precision.
It should be further noted that the first heating to the second heating is performed by gradually increasing the temperature. In this way, the quality of the 7050 alloy ingot can be ensured.
Furthermore, the temperature rising rate is less than or equal to 5 ℃/h when the temperature is gradually raised.
In conclusion, the 7050 alloy ingot is placed in the electric heating air circulating furnace, and then the 7050 alloy ingot is subjected to primary heating by the electric heating air circulating furnace, wherein the primary heating temperature is 400-410 ℃, and the temperature is kept for 10 hours. And then heating the electric heating air circulating furnace at the speed of less than or equal to 5 ℃/h to 472 ℃ and 478 ℃, carrying out secondary heating on the 7050 alloy ingot, and preserving the heat for 45 h. Referring to fig. 2 and 3, fig. 2 is a high microstructure metallographic image of an ingot of 7050 alloy according to an embodiment of the prior art. Fig. 3 is a high-magnification-structure metallographic image of an ingot of 7050 alloy according to an embodiment of the present invention. As is apparent from comparison between fig. 2 and fig. 3, the 7050 alloy ingot of the present invention has a greatly reduced residual phase and a reduced cracking source. In addition, the toughness of the plate material of the 7050 alloy in the invention is measured to be improved by 2-3MPa v m compared with the toughness of the plate material of the 7050 alloy in the prior art.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A7050 alloy ingot homogenizing heat treatment process is characterized by comprising the following steps:
s1: primary heating is carried out on the 7050 alloy ingot, the primary heating temperature is 400-410 ℃, and the temperature is kept for 9.5-10.5 hours;
s2: and (3) carrying out secondary heating on the 7050 alloy ingot, wherein the secondary heating temperature is 472-.
2. The homogenized heat treatment process for a 7050 alloy ingot according to claim 1, wherein the holding time of the primary heating is 10 hours.
3. The homogenized heat treatment process for an alloy 7050 ingot according to claim 1, wherein the holding time of the secondary heating is 45 hours.
4. The homogenized heat treatment process for a 7050 alloy ingot according to claim 1, wherein the primary heating and the secondary heating are performed in a closed space.
5. The homogenized heat treatment process for 7050 alloy ingots according to claim 4, wherein the primary heating and the secondary heating are performed in an electrically heated air circulating furnace.
6. The homogenized heat treatment process for 7050 alloy ingots according to claim 1, wherein the primary heating to the secondary heating is a gradual temperature rise transition.
7. The homogenized heat treatment process of a 7050 alloy ingot according to claim 6, wherein the temperature rise rate of the temperature rise is not more than 5 ℃/hour.
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| CN202010493829.5A CN111500951A (en) | 2020-06-03 | 2020-06-03 | Homogenization heat treatment process of 7050 alloy ingot |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732761A (en) * | 2012-06-18 | 2012-10-17 | 中国航空工业集团公司北京航空材料研究院 | 7000 series aluminum alloy material and preparation method thereof |
| JP2014105389A (en) * | 2012-11-30 | 2014-06-09 | Aisin Keikinzoku Co Ltd | Billet for extrusion molding of 7000 series aluminum alloy, and extruded shape material using the same |
| CN104451291A (en) * | 2014-11-21 | 2015-03-25 | 北京工业大学 | Homogenizing heat treatment process of Er and Zr composite microalloyed Al-Zn-Mg-Cu alloy |
| CN107354412A (en) * | 2017-08-09 | 2017-11-17 | 中车青岛四方机车车辆股份有限公司 | A kind of Al Zn Mg alloy twin-stage homogenization process containing Zr |
-
2020
- 2020-06-03 CN CN202010493829.5A patent/CN111500951A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732761A (en) * | 2012-06-18 | 2012-10-17 | 中国航空工业集团公司北京航空材料研究院 | 7000 series aluminum alloy material and preparation method thereof |
| JP2014105389A (en) * | 2012-11-30 | 2014-06-09 | Aisin Keikinzoku Co Ltd | Billet for extrusion molding of 7000 series aluminum alloy, and extruded shape material using the same |
| CN104451291A (en) * | 2014-11-21 | 2015-03-25 | 北京工业大学 | Homogenizing heat treatment process of Er and Zr composite microalloyed Al-Zn-Mg-Cu alloy |
| CN107354412A (en) * | 2017-08-09 | 2017-11-17 | 中车青岛四方机车车辆股份有限公司 | A kind of Al Zn Mg alloy twin-stage homogenization process containing Zr |
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Application publication date: 20200807 |