CN107119245B - A kind of multistage annealing process of the strong big ingot blank of high temperature resistant magnesium alloy of superelevation - Google Patents
A kind of multistage annealing process of the strong big ingot blank of high temperature resistant magnesium alloy of superelevation Download PDFInfo
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- CN107119245B CN107119245B CN201710179996.0A CN201710179996A CN107119245B CN 107119245 B CN107119245 B CN 107119245B CN 201710179996 A CN201710179996 A CN 201710179996A CN 107119245 B CN107119245 B CN 107119245B
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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
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
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Abstract
The invention discloses a kind of multistage annealing process of the strong big ingot blank of high temperature resistant magnesium alloy of superelevation, alloy mass percentage is：Gd：8.0 9.6%, Y：1.8 3.2%, Gd ingredient and the ratio of Y ingredients are：3≤Gd/Y≤5, Zr：0.3 0.7%, Er：0.02 0.3%, Ag：0.02‑0.5%.Elder generation's heat-treatment furnace of the present invention is preheated to 100 150 DEG C of heat preservations；It is transferred in heat-treatment furnace after ingot blank is cast again；200 250 DEG C of progress stress relief annealings are warming up to, heat preservation 12 is for 24 hours；500 530 DEG C of progress Homogenization Treatments are warming up to, 15 30h are kept the temperature；Ingot casting comes out of the stove with being furnace-cooled to 70 100 DEG C and is air-cooled to room temperature after heat preservation.Present invention process process is simple, by stress relief annealing and homogenization heat treatment organic combination, not only shortens technological process, but also solve the problems, such as that the big ingot blank of super high-strength magnesium alloy is easy to crack.
Description
Technical field
The present invention relates to field of magnesium alloy, more particularly to the annealing of the super big ingot casting of high-strength magnesium alloy.
Background technology
Magnesium alloy has low-density, high specific strength, high specific stiffness and excellent damping capacity, thus in automobile, aviation
There is an urgent need for have broad application prospects to improve the field of fuel efficiency and gather around by loss of weight for space flight, weaponry etc..However current
Commercial magnesium alloy, such as AZ31, AZ80, absolute intensity is relatively low and poor heat resistance, significantly limits the extensive use of magnesium alloy.
Therefore, heat safe magnesium-rare earth gradually causes the interest of researcher to superelevation by force, and not only absolute intensity is close or even super
Two line aluminium alloys are crossed, heat resistance is also significantly better than existing commercial magnesium alloy.But the big ingot blank of ultrahigh-strength rare earth-magnesium alloy at present
Preparation be still a challenge, especially big ingot casting there are residual stress due to causing in cooling, homogenization and sawing
Problem easy to crack seriously hinders its development in journey.It is closed for the strong high temperature resistant magnesium of superelevation in consideration of it, the invention discloses one kind
Stress relief annealing and homogenization heat treatment are organically combined, both may be used by the multistage annealing process of golden big ingot blank, the technique
To shorten technological process, cost-effective, and it can effectively solve the problems, such as that the big ingot blank of super high-strength magnesium alloy is easy to crack.
Invention content
To overcome the big ingot blank of ultrahigh-strength rare earth-magnesium alloy since there are larger residual stress to cause in cooling, homogenization
And problem easy to crack in sawing process, the present invention provides a kind of multistage annealing process for the series alloy.For
Alloying component is（Mass percent）：Gd：8.0-9.6%, Y：The ratio between content of 1.8-3.2%, Gd and Y is：3≤Gd/Y≤5,
Zr：0.3-0.7%, Er：0.02-0.3%, Ag：0.02-0.5%, remaining is Mg and not removable impurity.The concrete technology of annealing
Process is as follows：
A. heat-treatment furnace is preheated to 100-150 DEG C of heat preservation；
B. in being transferred in heat-treatment furnace in 10-20min after ingot blank casting；
C. heat-treatment furnace is warming up to 200-250 DEG C of progress stress relief annealing, and 0.5-2 DEG C of heating rate/min keeps the temperature 12-
24h；
D. heat-treatment furnace is warming up to 500-530 DEG C of progress Homogenization Treatments, and 2-5 DEG C of heating rate/min keeps the temperature 15-30h；
E. for ingot casting with being furnace-cooled to 70-100 DEG C, then coming out of the stove is air-cooled to room temperature after keeping the temperature.
Heat-treatment furnace need to be preheated to 120-150 DEG C in advance in the step A.
It need to be transferred in heat-treatment furnace in 10-15min after ingot blank casting in the step B.
Heat-treatment furnace need to be warming up to 225-250 DEG C in the step C, and 1-2 DEG C of heating rate/min keeps the temperature 15-20h.
Heat-treatment furnace need to be warming up to 510-530 DEG C in the D steps, and 3-5 DEG C of heating rate/min keeps the temperature 20-30h.
Ingot casting need to be with being furnace-cooled to 80-100 DEG C in the E steps.
The principle that the selection of technological parameter is based in the present invention is：1）Avoid big ingot blank when through this process by
Additional cold heat impact；2）Avoid the heating/inhomogeneous cooling is even and generates additional heat and answers when through this process of big ingot blank
Power.Based on this, heat-treatment furnace is first preheated to 100-150 DEG C by ingot casting before entering stove, because ingot casting casting terminates to leave founder
Making temperature when platform, generally in the section, such temperature range can ensure will not be because by additional cold heat after ingot casting enters stove
It impacts and causes to crack.Further, since the thermal conductivity of magnesium alloy is relatively low, heat up too fast easily cause caused by conducting heat slowly
Internal and external temperature is uneven, generates additional thermal stress, therefore select the heating rate of 0.5-2 DEG C/min.The experimental results showed that
200-250 DEG C is a suitable temperature range for eliminating stress, and the too low destressing of temperature is ineffective, and temperature is excessively high, can make
At energy waste, increase cost, therefore the first heat preservation section that the present invention selects is 200-250 DEG C.First stage heat preservation terminates
Afterwards, ingot blank internal stress is eliminated, thus second stage heating rate can be properly increased to 2-5 DEG C/min.To avoid ingot casting from going out
Cold shock is caused to generate additional residual stress due to instantaneously bearing the huge temperature difference when stove, present invention selection is before coming out of the stove by ingot
Then base is come out of the stove air-cooled again with being furnace-cooled to 70-100 DEG C.
The present invention solves the big ingot blank of ultrahigh-strength rare earth-magnesium alloy in cooling, homogenization by rationally controlling technological parameter
And problem easy to crack in sawing process, successfully prepare the strong High-temperature-resrarent rarent earth magnesium alloy ingot of superelevation of the major diameter without cracking
Base.
Description of the drawings
Fig. 1 is the cross-sectional view of the strong magnesium alloy ingot of superelevation of the Φ 340mm handled through annealing process of the present invention；
Fig. 2 is the cross-sectional view of the strong magnesium alloy ingot of superelevation of the Φ 460mm handled through annealing process of the present invention；
Fig. 3 is that the strong magnesium alloy ingot of superelevation of the Φ 340mm handled without annealing process of the present invention is opened in sawing
The case where splitting is schemed.
Specific implementation mode
Embodiment 1
Magnesium alloy food ingredient is（Mass percent）Gd：8.5%, Y：2.5%, Zr：0.5%, Ag：0.1%, Er：0.1%,
Remaining is Mg and a small amount of not removable impurity.Ingot diameters are Φ 340mm.Ingot blank enters stove immediately after casting to carry out at annealing
Reason, heat-treatment furnace are preheated to 100 DEG C in advance, and ingot blank enters is warming up to 200 DEG C after stove with the speed of 2 DEG C/min, keeps the temperature 12h.First
After stage keeps the temperature, 510 DEG C of heat preservation 20h are warming up to the speed of 5 DEG C/min.After heat preservation, with being furnace-cooled to 100 DEG C, so
After come out of the stove and be air-cooled to room temperature.The strong magnesium alloy ingot of superelevation of Φ 340mm through the process is up-to-standard, no cracking situation,
As shown in Figure 1.
Embodiment 2
Magnesium alloy food ingredient is（Mass percent）Gd：8.0%, Y：2.0%, Zr：0.5%, Ag：0.1%, Er：0.1%,
Remaining is Mg and a small amount of not removable impurity.Ingot diameters are Φ 460mm.Ingot blank enters stove immediately after casting to carry out at annealing
Reason, heat-treatment furnace are preheated to 150 DEG C in advance, and ingot blank enters is warming up to 250 DEG C after stove with the speed of 1 DEG C/min, and heat preservation is for 24 hours.First
After stage keeps the temperature, 520 DEG C of heat preservation 30h are warming up to the speed of 3 DEG C/min.After heat preservation, with being furnace-cooled to 70 DEG C, then
It comes out of the stove and is air-cooled to room temperature.The strong magnesium alloy ingot of superelevation of Φ 460mm through the process is up-to-standard, no cracking situation, such as
Shown in Fig. 2.
Comparative example 1
Magnesium alloy food ingredient is（Mass percent）Gd：8.5%, Y：2.5%, Zr：0.5%, Ag：0.1%, Er：0.1%,
Remaining is Mg and a small amount of not removable impurity.Ingot diameters are Φ 340mm.Ingot blank is not made annealing treatment after casting, directly
It is air-cooled to room temperature.Due to causing to crack there are higher internal stress in ingot casting when sawing, ingot casting is caused to scrap, as shown in Figure 3.
As can be seen that due to having carried out multistage annealing in embodiment 1-2, ingot blank quality is better than comparative example 1.
Claims (6)
1. a kind of multistage annealing process of the strong big ingot blank of high temperature resistant magnesium alloy of superelevation, alloying component mass percent are：Gd：8.0-
9.6%, Y：1.8-3.2%, Gd ingredient and the ratio of Y ingredients are：3≤Gd/Y≤5, Zr：0.3-0.7%, Er：0.02-0.3%, Ag：
0.02-0.5%, remaining is Mg and not removable impurity, is specifically included the following process：
A. heat-treatment furnace is preheated to 100-150 DEG C of heat preservation；
B. in being transferred in heat-treatment furnace in 10-20min after ingot blank casting；
C. heat-treatment furnace is warming up to 200-250 DEG C of progress stress relief annealing, and 0.5-2 DEG C of heating rate/min keeps the temperature 12-24h；
D. heat-treatment furnace is warming up to 500-530 DEG C of progress Homogenization Treatments, and 2-5 DEG C of heating rate/min keeps the temperature 15-30h；
E. for ingot casting with being furnace-cooled to 70-100 DEG C, then coming out of the stove is air-cooled to room temperature after keeping the temperature.
2. multistage annealing process according to claim 1, it is characterised in that：Heat-treatment furnace need to be preheated in advance in step A
120-150℃。
3. multistage annealing process according to claim 1, it is characterised in that：It need to be in 10- after ingot blank casting in step B
It is transferred in heat-treatment furnace in 15min.
4. multistage annealing process according to claim 1, it is characterised in that：Heat-treatment furnace need to be warming up to 225- in step C
250 DEG C, 1-2 DEG C of heating rate/min keeps the temperature 15-20h.
5. multistage annealing process according to claim 1, it is characterised in that：Heat-treatment furnace need to be warming up to 510- in D steps
530 DEG C, 3-5 DEG C of heating rate/min keeps the temperature 20-30h.
6. multistage annealing process according to claim 1, it is characterised in that：Ingot casting need to be with being furnace-cooled to 80-100 in E steps
℃。
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| CN110229984B (en) * | 2019-06-20 | 2020-08-04 | 上海交通大学 | High-strength Mg-Gd-Er-Y magnesium alloy and preparation method thereof |
| CN111961820A (en) * | 2020-07-22 | 2020-11-20 | 金华浩翔汽配有限公司 | Method for reducing internal stress of product by using high-temperature oven |
| CN115055653B (en) * | 2022-06-29 | 2023-09-08 | 中国兵器装备集团西南技术工程研究所 | Preparation method of large-size rare earth magnesium alloy cast ingot |
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| CN101914737A (en) * | 2010-07-07 | 2010-12-15 | 中南大学 | Heat treatment process of large-size high-tensile magnesium alloy extrusion |
| CN102337441A (en) * | 2011-10-27 | 2012-02-01 | 哈尔滨工业大学 | Ultrahigh-strength rare earth-magnesium alloy board and preparation method thereof |
| CN102732763A (en) * | 2012-05-24 | 2012-10-17 | 重庆大学 | High-strength Mg-Gd-Y-Zn-Mn alloy |
| JP2013129914A (en) * | 2011-11-22 | 2013-07-04 | National Institute Of Advanced Industrial Science & Technology | Method for producing magnesium alloy sheet material, magnesium alloy sheet material, and press molding using the same |
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| CN101914737A (en) * | 2010-07-07 | 2010-12-15 | 中南大学 | Heat treatment process of large-size high-tensile magnesium alloy extrusion |
| CN102337441A (en) * | 2011-10-27 | 2012-02-01 | 哈尔滨工业大学 | Ultrahigh-strength rare earth-magnesium alloy board and preparation method thereof |
| JP2013129914A (en) * | 2011-11-22 | 2013-07-04 | National Institute Of Advanced Industrial Science & Technology | Method for producing magnesium alloy sheet material, magnesium alloy sheet material, and press molding using the same |
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| WO2016161565A1 (en) * | 2015-04-08 | 2016-10-13 | Baoshan Iron & Steel Co., Ltd. | Formable magnesium based wrought alloys |
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Effective date of registration: 20230105 Address after: 414028 Room 1258, Block A, Building 1, Lingang High tech Industrial Park, Yongji Avenue, Yueyang District, Yueyang Pilot Free Trade Zone, Hunan Province Patentee after: Hunan Mayu Technology Co.,Ltd. Address before: Yuelu District City, Hunan province 410083 Changsha Lushan Road No. 932 Patentee before: CENTRAL SOUTH University |