CN103451582B - 7XXX line aluminium alloy and heat treating method thereof - Google Patents
7XXX line aluminium alloy and heat treating method thereof Download PDFInfo
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- CN103451582B CN103451582B CN201310334342.2A CN201310334342A CN103451582B CN 103451582 B CN103451582 B CN 103451582B CN 201310334342 A CN201310334342 A CN 201310334342A CN 103451582 B CN103451582 B CN 103451582B
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Abstract
The invention discloses a kind of 7XXX line aluminium alloy and heat treating method thereof.Described heat treating method, for heat-treating 7XXX line aluminium alloy cast ingot, to improve the tensile strength of described 7XXX line aluminium alloy, yield strength and elongation, comprise: described ingot casting is squeezed into bar, squeezing parameter is: ingot casting extrusion temperature is 415 DEG C, container temperature is 415 DEG C, and extrusion ratio is 84:1, and extrusion speed is 1.6-1.8m/min; Thermal effect process when carrying out described bar, pre-age temperature is 110 DEG C, and the preageing time is 4 hours, and whole aging temp is 160 DEG C, and whole aging time is 8 hours.The present invention, by adopting novel thermal treatment process, obtains and has larger tensile strength, the 7XXX line aluminium alloy of larger yield strength and larger elongation.
Description
Technical field
The present invention relates to field of aluminum alloy heat treatment technology, particularly relate to a kind of 7XXX line aluminium alloy and heat treating method thereof.
Background technology
Reduce oil consumption, emissions reduction, raising safety performance be current Global Auto industry institute necessary faced by problem, automotive light weight technology is then the important measures realizing automotive energy-saving emission-reducing.Aluminium alloy extrusions has the features such as density is little, intensity is high, solidity to corrosion is good, and reaching under same mechanical performance index, comparable steel alleviates the weight of 1/2nd nearly.So it can be used as the material of alternative steel collision bumper.
7XXX system (Al-Zn-Mg-Cu system) aluminium alloy is that typical thermal treatment can enhanced deformation aluminium alloy, by reasonable arrangement thermal treatment process, can improve aluminum alloy machinery intensity, meet the requirement of its safety performance while alleviating body quality.
Summary of the invention
The object of the present invention is to provide a kind of heat treating method of 7XXX line aluminium alloy, the 7XXX line aluminium alloy utilizing this heat treating method to obtain has larger tensile strength, larger yield strength and larger elongation.Present invention also offers a kind of 7XXX line aluminium alloy adopting this heat treating method to obtain.
To achieve these goals, the invention provides a kind of heat treating method, for heat-treating 7XXX line aluminium alloy cast ingot, to improve the tensile strength of described 7XXX line aluminium alloy, yield strength and elongation, comprising:
Described ingot casting is squeezed into bar, and squeezing parameter is: ingot casting extrusion temperature is 415 DEG C, and container temperature is 415 DEG C, and extrusion ratio is 84:1, and extrusion speed is 1.6-1.8m/min;
Thermal effect process when carrying out described bar, pre-age temperature is 110 DEG C, and the preageing time is 4 hours, and whole aging temp is 160 DEG C, and whole aging time is 8 hours.
Preferably, the diameter of described bar can be 10mm.
In one embodiment, described extrusion speed can be 1.8m/min.
In one embodiment, described 7XXX line aluminium alloy can be 7006 aluminium alloys.
Present invention also offers a kind of 7XXX line aluminium alloy, adopt aforesaid heat treating method to make.
The present invention, by adopting novel thermal treatment process, obtains and has larger tensile strength, the 7XXX line aluminium alloy of larger yield strength and larger elongation.Further, when 7XXX line aluminium alloy is 7006 aluminium alloy, alloy has better comprehensive mechanical performance, thus facilitates the widespread use in the automotive industry of such material.
Accompanying drawing explanation
Fig. 1 is according to the material hardness of the embodiment of the present invention graphic representation with preageing time variations.
Fig. 2 is according to the material hardness of the embodiment of the present invention graphic representation with terminal hour effect time variations.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with accompanying drawing, specific embodiment is described in detail.
The present invention is used for heat-treating 7XXX line aluminium alloy cast ingot or strand, to improve the tensile strength of 7XXX line aluminium alloy, yield strength and elongation.Two steps can be comprised: thermal effect process when ingot casting being squeezed into bar and bar is carried out.Application heat finds, best squeezing parameter ingot casting being squeezed into bar is: ingot casting extrusion temperature is 415 DEG C, and container temperature is 415 DEG C, and extrusion ratio is 84:1, and extrusion speed is 1.6-1.8m/min.The diameter of bar can be 10mm.
For thermal effect process when carrying out bar, owing to adopting different system of ageing treatment, the performance of same alloy can produce significant difference, so determine that optimum heat treating regime is one of Main Means giving full play to alloy property advantage.
In the present invention, two-stage time effect thermal treatment process is adopted for 7XXX aluminium alloy.The pre-age temperature of two-stage time effect thermal treatment process, preageing time, whole level aging temp, whole aging time are very remarkable on the impact of material property.Applicant finds, when pre-age temperature is 110 DEG C, whole aging temp is 160 DEG C, the performance of the 7XXX line aluminium alloy of acquisition is more superior compared with other aging temps.
Therefore, preageing time and whole aging time need only be chosen when adopting positive quadraturing design test determination optimum processing parameter.It is 110 DEG C that Fig. 1 shows at pre-age temperature, and whole aging temp is 160 DEG C, and when the whole treatment time elects 8h as, alloy rigidity is with the graphic representation of preageing time variations.As shown in Figure 1, the preageing time at 0-4h time, alloy rigidity value increases with the growth of preageing time; Alloy reaches timeliness peak value when preageing 4h, and then material hardness value reduces with the growth (4-8h) of preageing time.Applicant finds, this is due to the long preageing time (4-8h), alloy can be caused after terminal hour effect to obtain thick precipitated phase, thus the strength of materials is reduced.
Fig. 2 shows and is 110 DEG C at pre-age temperature, and when pretreatment time is 4h, alloy rigidity imitates the graphic representation of time variations with whole aging temp and terminal hour.As shown in Figure 2, for the whole aging temp of difference and whole aging time, the hardness value of 7XXX alloy is also different.Alloy is 110 DEG C at pre-age temperature, and pretreatment time is 4h, and obtain higher hardness value when whole aging temp is 160 DEG C, and reach timeliness peak value when whole aging time is 8h, alloy rigidity mean value reaches 210HB.After different whole out-of-service time process, the mechanical property contrast of alloy is in table 1.
The mechanical property of alloy after table 1 different terminal hour effect time-triggered protocol
As shown in Table 1, final argument adopts 110 DEG C × 4h+160 DEG C × 8h(and pre-age temperature to be 110 DEG C, the preageing time is 4 hours, whole aging temp is 160 DEG C, and whole aging time is 8 hours) after two-stage time effect process, the mechanical property of 7XXX alloy is optimum, strength of alloy is 760.3MPa, yield strength is 570.2MPa, and elongation after fracture is 24.8%, close to the performance with high Strength Steel for Motor Vehicles.
Applicant also finds, when 7XXX line aluminium alloy is 7006 aluminium alloy, and preferably treatment method of the present invention, namely ingot casting extrusion temperature is 415 DEG C, and container temperature is 415 DEG C, and extrusion ratio is 84:1, and extrusion speed is 1.8m/min; Pre-age temperature is 110 DEG C, the preageing time is 4 hours, whole aging temp is 160 DEG C, whole aging time is after process in 8 hours, the tensile strength of 7006 aluminium alloys can arrive more than 780MPa, and yield strength reaches more than 580MPa, and elongation after fracture reaches more than 20%, 7000 be alloy phase ratio with other of domestic-developed, this alloy demonstrates superstrength and good plasticity.Visible, the cooperation that method of the present invention can make the intensity of 7XXX alloy and plasticity reach good.Meanwhile, this has also widened 7XXX alloy material range of application in the automotive industry greatly.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a heat treating method, for heat-treating 7XXX line aluminium alloy cast ingot, to improve the tensile strength of described 7XXX line aluminium alloy, yield strength and elongation, is characterized in that, comprise:
Pressing steps: described ingot casting is squeezed into bar, squeezing parameter is: ingot casting extrusion temperature is 415 DEG C, and container temperature is 415 DEG C, and extrusion ratio is 84:1, extrusion speed be 1.6 ?1.8m/min;
Two-stage time effect heat treatment step: thermal effect process when carrying out described bar, pre-age temperature is 110 DEG C, and the preageing time is 4 hours, and whole aging temp is 160 DEG C, and whole aging time is 8 hours.
2. heat treating method according to claim 1, is characterized in that, the diameter of described bar is 10mm.
3. heat treating method according to claim 1, is characterized in that, described extrusion speed is 1.8m/min.
4. heat treating method according to claim 1, is characterized in that, described 7XXX line aluminium alloy is 7006 aluminium alloys.
5. a 7XXX line aluminium alloy, adopts the heat treating method according to any one of claim 1 ?4 to make.
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| CN103451582B true CN103451582B (en) | 2015-11-25 |
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| CN112813367B (en) * | 2020-12-28 | 2021-12-21 | 江苏江南创佳型材有限公司 | Preparation method of 7XXX series aluminum alloy bar based on mechanical ultrasonic vibration aging |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796974A (en) * | 2012-08-13 | 2012-11-28 | 北京有色金属研究总院 | Improved 7000 series aluminum alloy double-stage overaging heat treatment technology |
| CN103060632A (en) * | 2012-12-18 | 2013-04-24 | 莫纳什大学 | Aluminum alloy for automotive body and heat treatment method |
| CN103103370A (en) * | 2012-12-11 | 2013-05-15 | 龙口市丛林铝材有限公司 | Production technology of aluminum alloy sections used for brake pad |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796974A (en) * | 2012-08-13 | 2012-11-28 | 北京有色金属研究总院 | Improved 7000 series aluminum alloy double-stage overaging heat treatment technology |
| CN103103370A (en) * | 2012-12-11 | 2013-05-15 | 龙口市丛林铝材有限公司 | Production technology of aluminum alloy sections used for brake pad |
| CN103060632A (en) * | 2012-12-18 | 2013-04-24 | 莫纳什大学 | Aluminum alloy for automotive body and heat treatment method |
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