CN106244957A - The Technology for Heating Processing of AlSi7Mg aluminium alloy castings - Google Patents
The Technology for Heating Processing of AlSi7Mg aluminium alloy castings Download PDFInfo
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- CN106244957A CN106244957A CN201610171415.4A CN201610171415A CN106244957A CN 106244957 A CN106244957 A CN 106244957A CN 201610171415 A CN201610171415 A CN 201610171415A CN 106244957 A CN106244957 A CN 106244957A
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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
- C22F1/043—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 silicon 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
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon 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 present invention relates to the Technology for Heating Processing of AlSi7Mg aluminium alloy castings.Specifically, the present invention provides the heat treatment method of a kind of aluminium alloy castings, described method to include solution treatment and the process of incomplete artificial aging, and wherein, solution treatment is incubated 5～7 hours after including aluminium alloy castings is heated to 538～545 DEG C；Not exclusively artificial aging is incubated 2.5～3.5 hours after processing and including aluminium alloy castings is heated to 165～175 DEG C.The method using the present invention can above improve the comprehensive mechanical performance of alloy product largely, expands the use field of alloy product further.
Description
Technical field
The present invention relates to the Technology for Heating Processing of AlSi7Mg aluminium alloy castings.
Background technology
The aluminum alloy materials that wheel stand uses is AlSi7Mg0.3.Along with the continuous progress of platform technology, produce
Being on the increase of category type, vehicle mobility and comfortableness requirement are improved constantly by passenger, for enabling aluminum alloy to
The comprehensive mechanical performance of foundry goods meets the ever-increasing heavily stressed loading demands of end disk-like accessory, and mechanical performance is wanted
Reach: tensile strength ＞ 305N/mm2(individual event value), tensile strength ＞ 315N/mm2(meansigma methods, n=3)；
Yield strength ＞ 245N/mm2(individual event value), yield strength ＞ 255N/mm2(meansigma methods, n=3)；Prolong
Stretching rate ＞ 6% (individual event value), elongation percentage ＞ 8% (meansigma methods, n=3), this performance is far above standard and state
Interior best performance requirement, this causes huge for production firm and the whole-car firm of domestic and international wheel stand
Difficulty and challenge.
Summary of the invention
The present inventor thinks through research, uses special T64 Technology for Heating Processing that product is carried out heat treatment,
Above-mentioned mechanical property requirements could be met.
Therefore, first aspect present invention provides the heat treatment method of a kind of aluminium alloy castings, and described method includes solid
Molten process and incomplete artificial aging process, wherein,
Solution treatment is incubated 5～7 hours after including aluminium alloy castings is heated to 538～545 DEG C；
Not exclusively artificial aging be incubated after processing and including aluminium alloy castings is heated to 165～175 DEG C 2.5～
3.5 hour.
In one or more embodiments, solution treatment includes being heated to aluminium alloy castings 538～543
℃。
In one or more embodiments, solution treatment includes being heated to aluminium alloy castings 540 ± 1 DEG C.
In one or more embodiments, the temperature retention time of solution treatment is 5.5～6.5 hours.
In one or more embodiments, incomplete artificial aging processes and includes that just foundry goods is heated to
168～173 DEG C.
In one or more embodiments, incomplete artificial aging processes and includes that just foundry goods is heated to 170
±1℃。
In one or more embodiments, the temperature retention time that incomplete artificial aging processes is 180 ± 10 points
Clock.
In one or more embodiments, described method also includes quenching and cooling step, wherein, quenching
Including the foundry goods quenching that solution treatment is obtained, wherein, quenching delay time≤12 second；Cooling includes quenching
Fire gained foundry goods is cooled to room temperature.
In one or more embodiments, quenching includes quenching in water by foundry goods, makes foundry goods chilling.
In one or more embodiments, described method includes:
(1) solution treatment, including aluminium alloy castings is heated to 538～545 DEG C, is incubated 5～7 hours；
(2) quenching, including foundry goods quenching step (1) obtained, wherein, quenching delay time≤12
Second；
(3) cooling, is cooled to room temperature by step (2) gained foundry goods；With
(4) not exclusively artificial aging processes, and is heated to 165～175 including by the foundry goods that step (3) obtains
DEG C, keep 2.5～3.5 hours；
Thus complete the heat treatment to described aluminium alloy castings.
In one or more embodiments, the solution treatment of step (1) includes heating aluminium alloy castings
To 538～543 DEG C.
In one or more embodiments, the solution treatment of step (1) includes heating aluminium alloy castings
To 540 ± 1 DEG C.
In one or more embodiments, in step (1), after foundry goods is heated to institute's temp. displaying function, protect
Temperature 5.5～6.5 hours.
In one or more embodiments, the quenching of step (2) includes quenching in water by foundry goods, makes casting
Part chilling.
In one or more embodiments, step (4) includes that just foundry goods is heated to 168～173 DEG C.
In one or more embodiments, step (4) includes that just foundry goods is heated to 170 ± 1 DEG C.
In one or more embodiments, the temperature retention time of step (4) is 180 ± 10 minutes.
In one or more embodiments, described aluminium alloy castings is AlSi7Mg aluminium alloy castings.
In one or more embodiments, described aluminium alloy castings is AlSi7Mg0.3 aluminium alloy castings.
In one or more embodiments, by weight percentage, the chemical analysis bag of described aluminium alloy castings
Include:
Si, 6.50～7.50%；
Mg, 0.25～0.45%；
Ti, 0.080～0.250%；With
The Al of surplus and inevitable impurity.
In one or more embodiments, the content of Si is 6.80～7.20%, preferably 6.80～7.10%.
In one or more embodiments, the content of Mg is 0.30～0.45%, preferably 0.37～0.42%.
In one or more embodiments, the content of Ti is 0.100～0.180%, preferably 0.100～0.150
%.
In one or more embodiments, in described aluminium alloy castings, content≤0.05% of Cu；Mn contains
Amount≤0.100%；Content≤0.050% of Sr；Content≤0.190% of Fe；Content≤0.070% of Zn；
Content≤0.030% of Sn；Content≤0.030% of Pb；Content≤0.030% of Cr；Content≤0.030 of Ni
%；And impurity summation≤0.100%.
Second aspect present invention provides a kind of AlSi7Mg aluminium alloy castings, and by weight percentage, described aluminum closes
The chemical analysis of gold foundry goods includes:
Si, 6.50～7.50%；
Mg, 0.25～0.45%；
Ti, 0.080～0.250%；With
The Al of surplus and inevitable impurity；
Wherein, described aluminium alloy castings has a following mechanical performance:
Tensile strength individual event value ＞ 305N/mm2, tensile strength meansigma methods ＞ 315N/mm2(n≥3)；
Yield strength individual event value ＞ 245N/mm2, yield strength meansigma methods ＞ 255N/mm2(n≥3)；With
Elongation percentage individual event value ＞ 6%, elongation percentage meansigma methods ＞ 8% (n >=3).
In one or more embodiments, described AlSi7Mg aluminium alloy castings has a following mechanical performance:
Tensile strength individual event value ＞ 320N/mm2, tensile strength meansigma methods ＞ 330N/mm2(n≥3)；
Yield strength individual event value ＞ 255N/mm2, yield strength meansigma methods ＞ 265N/mm2(n≥3)；With
Elongation percentage individual event value ＞ 7%, elongation percentage meansigma methods ＞ 9% (n >=3).
In one or more embodiments, the content of Si is 6.80～7.20%, preferably 6.80～7.10%.
In one or more embodiments, the content of Mg is 0.30～0.45%, preferably 0.37～0.42%.
In one or more embodiments, the content of Ti is 0.100～0.180%, preferably 0.100～0.150
%.
In one or more embodiments, described aluminium alloy castings is AlSi7Mg0.3 aluminium alloy castings.
In one or more embodiments, in described aluminium alloy castings, content≤0.05% of Cu；Mn contains
Amount≤0.100%；Content≤0.050% of Sr；Content≤0.190% of Fe；Content≤0.070% of Zn；
Content≤0.030% of Sn；Content≤0.030% of Pb；Content≤0.030% of Cr；Content≤0.030 of Ni
%；And impurity summation≤0.100%.
In one or more embodiments, described aluminium alloy castings is at T64 Technology for Heating Processing as herein described
Manage and prepare.
The present invention also provides for the T64 heat treatment method of a kind of improvement, and described method includes that solution treatment is with incomplete
Artificial aging processes, wherein,
Solution treatment is to be incubated 5～7 hours at 538～545 DEG C；With
Not exclusively artificial aging is processed as being incubated 2.5～3.5 hours at 165～175 DEG C.
In one or more embodiments, described method also includes: quenching delay time≤12 after solution treatment
The Quenching Treatment of second, and after Quenching Treatment, it is cooled to the process of room temperature.
In one or more embodiments, solution treatment is to be incubated 5.5～6.5 hours at 538～543 DEG C,
Not exclusively artificial aging is processed as being incubated 180 ± 15 minutes at 168～173 DEG C.
In one or more embodiments, solution treatment is to be incubated 360 ± 10 minutes, no at 540 ± 1 DEG C
Artificial aging completely is processed as being incubated 180 ± 10 minutes at 170 ± 1 DEG C.
The present invention also provides for the heat treatment method of aluminium alloy castings as herein described or the T64 heat treatment method of improvement
Application in preparing AlSi7Mg aluminium alloy castings, or improve AlSi7Mg aluminium alloy castings tensile strength,
The application at least one mechanical performance in yield strength and elongation percentage.
The present invention also provides for a kind of aluminium alloy part, uses aluminium alloy castings of the present invention to prepare.
In one or more embodiments, described parts are wheel stand, knuckle or subframe.
Accompanying drawing explanation
Fig. 1 shows the shape of test lining bar.
Fig. 2 shows test position.1 is 1# tensile sample；2 is 2# tensile sample.
Detailed description of the invention
The present invention relates to the T64 heat treatment method of a kind of improvement, in described method, solution treatment be 538～
545 DEG C are incubated 5～7 hours；It is processed as being incubated 2.5～3.5 at 165～175 DEG C with incomplete artificial aging
Hour.
In certain embodiments, solution treatment is to be incubated 5.5～6.5 hours at 538～543 DEG C, such as, exist
540 ± 1 DEG C are incubated 360 ± 10 minutes.
In certain embodiments, incomplete artificial aging is processed as 168～173 DEG C and is incubated 180 ± 15 minutes,
Such as it is incubated 180 ± 10 minutes at 170 ± 1 DEG C.
Therefore, in certain embodiments, solution treatment is to be incubated 5.5～6.5 hours at 538～543 DEG C,
Not exclusively artificial aging is processed as 168～173 DEG C and is incubated 180 ± 15 minutes.Further, solution treatment
For being incubated 360 ± 10 minutes at 540 ± 1 DEG C, and not exclusively artificial aging is processed as 170 ± 1 DEG C of insulations
180 ± 10 minutes.
The T64 heat treatment method of described improvement also includes the quenching of quenching delay time≤12 second after solution treatment
Process, and after Quenching Treatment, be cooled to the process of room temperature.The method that can use routine quenches, such as, and will
The foundry goods that solution treatment obtains puts in water, makes foundry goods chilling.Cooling generally can use the mode of natural cooling,
The temperature making the foundry goods after quenching naturally cools to room temperature.
It is right that the T64 heat treatment method that the present invention improves is applicable to that conventional T64 heat treatment method carries out processing
As, include but not limited to aluminium alloy castings, especially AlSi7Mg aluminium alloy castings.The T64 that the present invention improves
Heat treatment method applies also for expectation and improves foundry goods, especially aluminium alloy castings, more specifically AlSi7Mg aluminium alloy
Foundry goods, tensile strength (single foundry goods or multiple (meansigma methodss of n >=3), yield strength (single foundry goods or many
Individual (meansigma methodss of n >=3) and elongation percentage (or several in single foundry goods or multiple (meansigma methodss of n >=3)
The situation of item mechanical performance.
At a concrete aspect, the T64 heat treatment method of improvement as herein described is used for having by the present invention
Following chemical analysis and the aluminium alloy castings of content (by weight percentage):
Si, 6.50～7.50%；
Mg, 0.25～0.45%；
Ti, 0.080～0.250%；With
The Al of surplus and inevitable impurity.
The content of Si is preferably 6.80～7.20%, more preferably 6.80～7.10%.The content of Mg is for being preferably
0.30～0.45%, more preferably 0.37～0.42%.The content of Ti is preferably 0.100～0.180%, more preferably
0.100～0.150%.
By weight percentage, if described aluminium alloy castings includes other chemical analysis, then these chemical analysis and
Its content is:
Cu, its content≤0.05%；
Mn, its content≤0.100%；
Sr, its content≤0.050%；
Fe, its content≤0.190%；
Zn, its content≤0.070%；
Sn, its content≤0.030%；
Pb, its content≤0.030%；
Cr, its content≤0.030%；
Ni, its content≤0.030%；And
Impurity summation≤0.100%.
Herein, impurity refers to other composition in addition to the above-mentioned composition listed.
In certain embodiments, content≤0.03% of Cu, preferably≤0.01%, such as 0.0030～
Between 0.0055%.In certain embodiments, content≤0.050% of Mn, preferably≤0.010%, such as
Between 0.0030～0.010%.In certain embodiments, content≤0.030% of Sr, such as 0.010～
Between 0.030%.In certain embodiments, the content of Fe preferably≤0.150%, such as 0.080～0.130
Between %, or between 0.100～0.115%.In certain embodiments, the content of Zn is preferably≤0.05
%, more preferably≤0.03%, such as between 0.010～0.025% or between 0.015～0.020%.?
In some embodiment, described aluminium alloy does not contains Sn, Pb, Cr and Ni.In certain embodiments, described
Aluminium alloy does not contains impurity.In certain embodiments, described aluminium alloy does not contains Sn, Pb, Cr and Ni, with
And impurity.
In certain embodiments, described aluminium alloy castings contains following components or composed of the following components:
Si, 6.8～7.1%；
Mg, 0.37～0.42%；
Ti, 0.100～0.150%；
Cu, 0.0030～0.0055%；
Mn, 0.0030～0.010%；
Sr, 0.010～0.030%；
Fe, 0.080～0.130%；
Zn, 0.010～0.025%；With
The Al of surplus.
In certain embodiments, described aluminium alloy castings is AlSi7Mg0.3 aluminium alloy castings.
In certain embodiments, the chemical analysis of described aluminium alloy castings meets EN1706 standard.
The aluminium alloy castings being suitable for carrying out heat treatment by T64 method as herein described can be to use this area various
The aluminium alloy castings that method prepares, this kind of aluminium alloy castings includes but not limited to use CPC counter-pressure casting to shape
Aluminium alloy castings.
Therefore, the heat treatment method of aluminium alloy castings includes that solution treatment and incomplete artificial aging process herein,
Wherein, it is incubated 5～7 hours after solution treatment includes aluminium alloy castings is heated to 538～545 DEG C；The completeest
Full artificial aging processes after including aluminium alloy castings is heated to 165～175 DEG C and is incubated 2.5～3.5 hours.
Preferably, the heat treatment method of aluminium alloy castings of the present invention includes:
(1) solution treatment, including aluminium alloy castings is heated to 538～545 DEG C, is incubated 5～7 hours；
(2) quenching, including foundry goods quenching step (1) obtained, wherein, quenching delay time≤12
Second；
(3) cooling, is cooled to room temperature by step (2) gained foundry goods；With
(4) not exclusively artificial aging processes, and is heated to 165～175 including by the foundry goods that step (3) obtains
DEG C, keep 2.5～3.5 hours；
Thus complete the heat treatment to described aluminium alloy castings.
In preferred embodiments, solution treatment includes being heated to aluminium alloy castings 538～543 DEG C, excellent
Select 540 ± 1 DEG C.Generally, foundry goods is heated to 538～545 DEG C, preferably 538～543 DEG C, more preferably 540
After ± 1 DEG C, this temperature keep 5.5～6.5 hours, preferably 6～6.5 hours.Then foundry goods is put into
Water quenches.Cool time generally≤12 seconds.It is allowed to naturally cool to room temperature, so after taking out foundry goods
After carry out incomplete artificial aging process.Not exclusively artificial aging processes and includes adding the foundry goods being cooled to room temperature
Heat to such as 168～173 DEG C, preferably 170 ± 1 DEG C, and keep such as 3～3.5 hours in this temperature, excellent
Select 180 ± 15 minutes, such as 180 ± 10 minutes.Afterwards, it is allowed to foundry goods natural cooling, thus can obtain
The aluminium alloy castings of the present invention.
Herein by foundry goods being heated to higher temperature 538～545 DEG C, it is incubated 5～7 hours so that alloy
Solvable phase in material is fully dissolved.Then, in the water quenched rapidly, foundry goods chilling, make to be dissolved in matrix
Strengthening constituent element is fixed the most to greatest extent, is saved in room temperature.The foundry goods heating that will be cooled to room temperature afterwards is certain
Temperature (165～175 DEG C), insulation relatively short period of time (2.5～3.5), to obtain the strengthening of disperse educt
Phase, and avoid growing up of hardening constituent to weaken strengthening effect, thus obtain higher intensity and preferable plasticity, tough
The comprehensive mechanical property of property.
Therefore, the present invention also provides for a kind of aluminium alloy castings, and it has previously described chemical analysis, and has
Following mechanical performance:
Tensile strength individual event value ＞ 305N/mm2, tensile strength meansigma methods ＞ 315N/mm2(n≥3)；
Yield strength individual event value ＞ 245N/mm2, yield strength meansigma methods ＞ 255N/mm2(n≥3)；With
Elongation percentage individual event value ＞ 6%, elongation percentage meansigma methods ＞ 8% (n >=3).
Preferably, described aluminium alloy castings has a following mechanical performance:
Tensile strength individual event value ＞ 320N/mm2, tensile strength meansigma methods ＞ 330N/mm2(n≥3)；
Yield strength individual event value ＞ 255N/mm2, yield strength meansigma methods ＞ 265N/mm2(n≥3)；With
Elongation percentage individual event value ＞ 7%, elongation percentage meansigma methods ＞ 9% (n >=3).
The present invention also provides for a kind of aluminium alloy part, and these parts use aluminium alloy castings of the present invention to be prepared into
Arrive.Described parts are it may be that such as wheel stand, knuckle or subframe.
Present invention can be suitably applied to automobile industry aluminium alloy castings heat treatment (such as wheel stand, knuckle,
Subframe etc.), it is also widely used for the industries such as Aeronautics and Astronautics, boats and ships, machinery.
Hereafter will illustrate the present invention in the way of specific embodiment.Should be understood that these embodiments are only to illustrate
Property, it is not limiting as protection scope of the present invention.Method employed in embodiment and technological parameter, unless
It is otherwise noted, is otherwise conventional method and the technological parameter of this area.Although moreover, it will be understood that originally
Wen Wei enumerates, but can at random combine herein for each feature described by each side.For example,
In aluminium alloy castings, each content range of each composition such as Si, Mg, Ti can at random combine, Technology for Heating Processing
Middle different different temperatures, time conditions also can at random combine.
Embodiment
To table 2 below having in the specimen coding 1-5 of shown chemical analysis and table 3, there is shown chemistry
The specimen coding 1-5 (being PQ46 wheel stand, material is AlSi7Mg0.3 aluminium alloy) of composition point
Do not carry out T64 heat treatment (" Bulgaria T64 ") and the basis of Bulgaria's CPC counter-pressure casting institute
The T64 heat treatment of invention.
Two kinds of T64 process of thermal treatment parameters are as shown in table 1 below:
Table 1
Concrete testing procedure and method are as follows:
1, coupon material is cut by Fig. 2 institute target mechanical performance sample position, coupon standard DIN50125 (see
Fig. 1)；
2, test by the rate of extension of 0.025%/s to 0.67%/s, until sample fracture.
3, the extensometer of gauge length 25mm is used directly to record the elongation percentage result of sample of having no progeny, test standard DIN
EN10002。
Testing equipment is tensilometer.
Result shows in table 2 and 3.
Can draw from the data of table 2 and 3:
1, in terms of the data of table 2, the wheel stand mechanicalness that Bulgaria's T64 Technology for Heating Processing is produced
Can: tensile strength and yield strength are the most qualified；Elongation percentage monodrome is qualified, but meansigma methods is defective.
2, in terms of the data of table 3, the every monodrome of wheel stand mechanical performance that the present invention is produced is with average
Value is satisfied by the requirement of product, and obtained mechanical properties data is the most stable, this explanation present invention's
Technology for Heating Processing and produce comparative maturity.Average tensile strength 337MPA, reaches the 106% of requirement；
Average yield strength 277MPA, reaches the 113% of requirement, and average elongation 10.4% reaches the 130% of requirement.
Therefore, the T64 Technology for Heating Processing of the present invention is more excellent than external T64 Technology for Heating Processing, product
Mechanical performance is significantly improved.This Technology for Heating Processing upper largely can improve the comprehensive of alloy product
Mechanical performance, expands the use field of alloy product further.
Claims (20)
1. a heat treatment method for aluminium alloy castings, described method includes solution treatment and incomplete artificial aging
Process, wherein,
Solution treatment is incubated 5～7 hours after including aluminium alloy castings is heated to 538～545 DEG C；
Not exclusively artificial aging be incubated after processing and including aluminium alloy castings is heated to 165～175 DEG C 2.5～
3.5 hour.
2. the method for claim 1, it is characterised in that solution treatment includes aluminium alloy castings
It is incubated 5.5～6.5 hours after being heated to 538～543 DEG C.
3. method as claimed in claim 2, it is characterised in that solution treatment includes aluminium alloy castings
It is incubated 360 ± 10 minutes after being heated to 540 ± 1 DEG C.
4. the method for claim 1, it is characterised in that not exclusively artificial aging process include by
Aluminium alloy castings is incubated 180 ± 15 minutes after being heated to 168～173 DEG C.
5. method as claimed in claim 4, it is characterised in that not exclusively artificial aging process include by
Aluminium alloy castings is incubated 180 ± 10 minutes after being heated to 170 ± 1 DEG C.
6. the method as according to any one of claim 1-5, it is characterised in that described method also includes
Quenching and cooling step, wherein, quenching includes that aluminium alloy castings solution treatment obtained quenches, wherein,
Quenching delay time≤12 second；Cooling includes quenching gained aluminium alloy castings is cooled to room temperature.
7. the method for claim 1, it is characterised in that by weight percentage, described aluminium alloy
The chemical analysis of foundry goods includes:
Si, 6.50～7.50%；
Mg, 0.25～0.45%；
Ti, 0.080～0.250%；With
The Al of surplus and inevitable impurity.
8. method as claimed in claim 7, it is characterised in that the content of Si is 6.80～7.20%, excellent
Select 6.80～7.10%；The content of Mg is 0.30～0.45%, preferably 0.37～0.42%；Content with Ti
It is 0.100～0.180%, preferably 0.100～0.150%.
9. method as claimed in claim 7, it is characterised in that in described aluminium alloy castings, the content of Cu≤
0.05%；Content≤0.100% of Mn；Content≤0.050% of Sr；Content≤0.190% of Fe；Zn's
Content≤0.070%；Content≤0.030% of Sn；Content≤0.030% of Pb；Content≤0.030% of Cr；
Content≤0.030% of Ni；And impurity summation≤0.100%.
10. an aluminium alloy castings, it uses the heat treatment method according to any one of claim 1-9 to process
Obtain.
11. 1 kinds of AlSi7Mg aluminium alloy castingses, by weight percentage, the chemistry one-tenth of described aluminium alloy castings
Part includes:
Si, 6.50～7.50%；
Mg, 0.25～0.45%；
Ti, 0.080～0.250%；With
The Al of surplus and inevitable impurity；
Wherein, described aluminium alloy castings has a following mechanical performance:
Tensile strength individual event value ＞ 305N/mm2, tensile strength meansigma methods ＞ 315N/mm2；
Yield strength individual event value ＞ 245N/mm2, yield strength meansigma methods ＞ 255N/mm2；With
Elongation percentage individual event value ＞ 6%, elongation percentage meansigma methods ＞ 8%；
Wherein, the meansigma methods that the aluminium alloy castings that described meansigma methods is measurement more than three is obtained.
12. aluminium alloy castingses as claimed in claim 11, it is characterised in that the content of Si is 6.80～7.20
%, preferably 6.80～7.10%；The content of Mg is 0.30～0.45%, preferably 0.37～0.42%；And Ti
Content be 0.100～0.180%, preferably 0.100～0.150%.
13. aluminium alloy castingses as claimed in claim 11, it is characterised in that in described aluminium alloy castings, Cu
Content≤0.05%；Content≤0.100% of Mn；Content≤0.050% of Sr；Content≤0.190 of Fe
%；Content≤0.070% of Zn；Content≤0.030% of Sn；Content≤0.030% of Pb；The content of Cr
≤ 0.030%；Content≤0.030% of Ni；And impurity summation≤0.100%.
14. aluminium alloy castingses as according to any one of claim 11-13, it is characterised in that described
AlSi7Mg aluminium alloy castings has a following mechanical performance:
Tensile strength individual event value ＞ 320N/mm2, tensile strength meansigma methods ＞ 330N/mm2；
Yield strength individual event value ＞ 255N/mm2, yield strength meansigma methods ＞ 265N/mm2；With
Elongation percentage individual event value ＞ 7%, elongation percentage meansigma methods ＞ 9%.
15. 1 kinds of T64 heat treatment methods improved, described method includes solution treatment and incomplete artificial aging
Process, it is characterised in that in described method,
Solution treatment is to be incubated 5～7 hours at 538～545 DEG C；With
Not exclusively artificial aging is processed as being incubated 2.5～3.5 hours at 165～175 DEG C.
16. methods as claimed in claim 15, it is characterised in that described method also includes: after solution treatment
The Quenching Treatment of quenching delay time≤12 second, and after Quenching Treatment, it is cooled to the process of room temperature.
17. methods as described in claim 15 or 16, it is characterised in that
Solution treatment is to be incubated 5.5～6.5 hours at 538～543 DEG C, and incomplete artificial aging is processed as
168～173 DEG C are incubated 180 ± 15 minutes；Or
Solution treatment is to be incubated 360 ± 10 minutes at 540 ± 1 DEG C, and incomplete artificial aging is processed as 170
± 1 DEG C is incubated 180 ± 10 minutes.
Method according to any one of 18. claim 15-17 answering in preparing AlSi7Mg aluminium alloy castings
With, or at least one machine in improving AlSi7Mg aluminium alloy castings tensile strength, yield strength and elongation percentage
Application in tool performance.
19. 1 kinds of aluminium alloy parts, use the aluminium alloy castings according to any one of claim 10-14 to prepare
Obtain.
20. aluminium alloy parts as claimed in claim 19, it is characterised in that described parts be wheel stand,
Knuckle or subframe.
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