CN103898381B - A kind of high-strength aluminum alloy section and preparation method thereof - Google Patents
A kind of high-strength aluminum alloy section and preparation method thereof Download PDFInfo
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- CN103898381B CN103898381B CN201410115755.6A CN201410115755A CN103898381B CN 103898381 B CN103898381 B CN 103898381B CN 201410115755 A CN201410115755 A CN 201410115755A CN 103898381 B CN103898381 B CN 103898381B
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Abstract
The invention discloses a kind of high-strength aluminum alloy section and preparation method thereof, by mass percent than this alloy composition be: Si 0.1-0.3, Zn 4.2-5.0, Mg 3.5-4.5, Cu 0.6-1.2, Bi 0.3-0.5, Nb 0.25-0.45, Mn 0.1-0.3, Cr 0.15-0.25, V 0.05-0.15, Ti 0.04-0.08, Sc 0.1-0.2, Yb 0.03-0.06, surplus are Al.Aluminium alloy extrusions of the present invention has very high physical strength, intensity is drawn to reach more than 650MPa, yield strength can reach more than 480MPa, and there is higher toughness, good stress-corrosion-cracking resistance, good hot workability and excellent welding property, full larger structured material can be born, be widely used in aerospace field.
Description
Technical field
The present invention relates to a kind of high-strength aluminum alloy section and preparation method thereof, belong to aluminum alloy materials field.
Background technology
Aluminium alloy density is low, but strength ratio is higher, close to or exceed high-quality steel, plasticity is good, be easy to processing, can be made into various section bar, there is excellent mechanical property, physicals and corrosion resistance.Aluminium alloy extrusions is widely used in aerospace, communications and transportation, machinofacture, construction and decoration, chemical industry etc., is a kind of important non-ferrous metal structured material.Along with develop rapidly that is scientific and technical and industrial economy, the requirement of aerospace structure material to intensity of aluminum alloy improves day by day, therefore, is badly in need of a kind of high-strength aluminum alloy section of exploitation, to meet the requirement of aerospace structure material.
Summary of the invention
The object of the present invention is to provide a kind of there is high strength while have again aluminium alloy extrusions of excellent over-all properties and preparation method thereof.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of high-strength aluminum alloy section, by mass percent than this alloy composition is: Si0.1-0.3, Zn4.2-5.0, Mg3.5-4.5, Cu0.6-1.2, Bi0.3-0.5, Nb0.25-0.45, Mn0.1-0.3, Cr0.15-0.25, V0.05-0.15, Ti0.04-0.08, Sc0.1-0.2, Yb0.03-0.06, surplus are Al.
The preparation method of high-strength aluminum alloy section of the present invention, comprises the following steps:
(1) furnace charge is taken by formulation ratio calculating, get aluminium ingot, zinc ingot metal adds heat fused in smelting furnace, when melt temperature reaches 730-750 DEG C, add magnesium ingot successively, Al-25wt%Cu master alloy, Al-5wt%Nb master alloy, Al-1wt%V master alloy, stir and follow-up continuing be warming up to 755-785 DEG C, add Al-5wt%Bi master alloy successively, Al-3wt%Mn master alloy, Al-2wt%Cr master alloy, after furnace charge all melts, stir 20-30min, make uniform composition, adjustment temperature is to 745-765 DEG C, by nitrogen, refining agent is blown into liquation face 2/3 place and carries out refining, refining agent consumption is the 1-2% of solution weight, skim after refining 20-30min, leave standstill 15-20min, adjustment temperature is to 720-740 DEG C, add other residue alloy element component, after stirring 10-15min, sampling analysis, it is qualified to be adjusted to, be that 1-2L/min leads to 75%Ar+25%Cl with gas flow
2mixed gas refinery by de-gassing 15-20min, skims, is warming up to 740-760 DEG C, cast of can coming out of the stove after the standing 10-15min of insulation, and teeming temperature is 680-700 DEG C,
(2) join in smelting furnace by the strand that step (1) obtains, be heated to 725-745 DEG C, after it melts completely, carry out second time sampling analysis after stirring 15-25min, then adjusting temperature to 710-730 DEG C, is that 2-3L/min leads to 60%N with gas flow
2+ 20%Cl
2+ 20%CO mixed gas refinery by de-gassing 15-20min, leaves standstill 20-30min after skimming, and both analysis is carried out in sampling, and analytical results meets alloying constituent and requires to come out of the stove cast, and teeming temperature is 690-710 DEG C;
(3) the remelting strand that step (2) obtains is carried out Homogenization Treatments in Homogenization Treatments stove: first at 360-420 DEG C, be incubated 4-6h, air cooling to room temperature, then is incubated 5-10h at 475-495 DEG C, and then strong wind cooling is to 220-260 DEG C, insulation 2-3h, air cooling is to room temperature;
(4) by the strand extrusion molding after homogenizing, extrusion temperature is 480-500 DEG C, and extruding rate is 15-20m/min, and then the section bar extruded is adopted air-cooled or water smoke Cooling Quenching online, carry out tension leveling after quenching, tensile deformation amount is 1.5-2.5%;
(5) aluminium alloy extrusions after tension leveling is carried out single-stage aging process: at 100-120 DEG C, be incubated 24-36h, air cooling of coming out of the stove is to room temperature.
Described refining agent by following weight part component form: SODIUMNITRATE 18-24, fluoric acid titanium potassium 5-10, Repone K 33-41, zinc chloride 15-20, sodium sulfate 3-8, phosphorus pentachloride 10-15, Sodium tetrafluoroborate 12-18, aluminum fluoride 8-14, calcium carbonate 16-22, wood charcoal powder 10-15.
Beneficial effect of the present invention:
Aluminium alloy extrusions of the present invention has very high physical strength, intensity is drawn to reach more than 650MPa, yield strength can reach more than 480MPa, and there is higher toughness, good stress-corrosion-cracking resistance, good hot workability and excellent welding property, full larger structured material can be born, be widely used in aerospace field.
Embodiment
Embodiment
A kind of high-strength aluminum alloy section, by mass percent than this alloy composition is: Si0.1-0.3, Zn4.2-5.0, Mg3.5-4.5, Cu0.6-1.2, Bi0.3-0.5, Nb0.25-0.45, Mn0.1-0.3, Cr0.15-0.25, V0.05-0.15, Ti0.04-0.08, Sc0.1-0.2, Yb0.03-0.06, surplus are Al.
The preparation method of high-strength aluminum alloy section, comprises the following steps:
(1) furnace charge is taken by formulation ratio calculating, get aluminium ingot, zinc ingot metal adds heat fused in smelting furnace, when melt temperature reaches 740 DEG C, add magnesium ingot successively, Al-25wt%Cu master alloy, Al-5wt%Nb master alloy, Al-1wt%V master alloy, stir and follow-up continuing be warming up to 765 DEG C, add Al-5wt%Bi master alloy successively, Al-3wt%Mn master alloy, Al-2wt%Cr master alloy, after furnace charge all melts, stir 25min, make uniform composition, adjustment temperature to 745 DEG C, by nitrogen, refining agent is blown into liquation face 2/3 place and carries out refining, refining agent consumption is 1.5% of solution weight, skim after refining 25min, leave standstill 20min, adjustment temperature to 730 DEG C, add other residue alloy element component, after stirring 10-15min, sampling analysis, it is qualified to be adjusted to, be that 1L/min leads to 75%Ar+25%Cl with gas flow
2mixed gas refinery by de-gassing 20min, skims, and is warming up to 750 DEG C, cast of can coming out of the stove after the standing 10min of insulation, and teeming temperature is 690 DEG C,
(2) join in smelting furnace by the strand that step (1) obtains, be heated to 730 DEG C, after it melts completely, carry out second time sampling analysis after stirring 20min, then adjusting temperature to 715 DEG C, is that 2L/min leads to 60%N with gas flow
2+ 20%Cl
2+ 20%CO mixed gas refinery by de-gassing 20min, leaves standstill 25min after skimming, and both analysis is carried out in sampling, and analytical results meets alloying constituent and requires to come out of the stove cast, and teeming temperature is 705 DEG C;
(3) the remelting strand that step (2) obtains is carried out Homogenization Treatments in Homogenization Treatments stove: first at 380 DEG C, be incubated 5h, air cooling to room temperature, then is incubated 8h at 485 DEG C, then strong wind cooling to 240 DEG C, insulation 3h, air cooling is to room temperature;
(4) by the strand extrusion molding after homogenizing, extrusion temperature is 490 DEG C, and extruding rate is 18m/min, and then the section bar extruded is adopted air-cooled or water smoke Cooling Quenching online, carry out tension leveling after quenching, tensile deformation amount is 2%;
(5) aluminium alloy extrusions after tension leveling is carried out single-stage aging process: at 120 DEG C, be incubated 24h, air cooling of coming out of the stove is to room temperature.
Described refining agent by following weight part component form: SODIUMNITRATE 22, fluoric acid titanium potassium 7, Repone K 36, zinc chloride 20, sodium sulfate 6, phosphorus pentachloride 15, Sodium tetrafluoroborate 16, aluminum fluoride 12, calcium carbonate 20, wood charcoal powder 12.
Through inspection, the salient features of gained aluminium alloy extrusions is: tensile strength 693MPa, yield strength 549MPa, elongation 13.4%.
Claims (1)
1. a high-strength aluminum alloy section, it is characterized in that, by mass percent than this alloy composition be: Si0.1-0.3, Zn4.2-5.0, Mg3.5-4.5, Cu0.6-1.2, Bi0.3-0.5, Nb0.25-0.45, Mn0.1-0.3, Cr0.15-0.25, V0.05-0.15, Ti0.04-0.08, Sc0.1-0.2, Yb0.03-0.06, surplus are Al;
The preparation method of described high-strength aluminum alloy section, comprises the following steps:
(1) furnace charge is taken by formulation ratio calculating, get aluminium ingot, zinc ingot metal adds heat fused in smelting furnace, when melt temperature reaches 730-750 DEG C, add magnesium ingot successively, Al-25wt%Cu master alloy, Al-5wt%Nb master alloy, Al-1wt%V master alloy, stir and follow-up continuing be warming up to 755-785 DEG C, add Al-5wt%Bi master alloy successively, Al-3wt%Mn master alloy, Al-2wt%Cr master alloy, after furnace charge all melts, stir 20-30min, make uniform composition, adjustment temperature is to 745-765 DEG C, by nitrogen, refining agent is blown into liquation face 2/3 place and carries out refining, refining agent consumption is the 1-2% of solution weight, skim after refining 20-30min, leave standstill 15-20min, adjustment temperature is to 720-740 DEG C, add other residue alloy element component, after stirring 10-15min, sampling analysis, it is qualified to be adjusted to, be that 1-2L/min leads to 75%Ar+25%Cl2 mixed gas refinery by de-gassing 15-20min with gas flow, skim, be warming up to 740-760 DEG C, insulation leaves standstill cast of can coming out of the stove after 10-15min, teeming temperature is 680-700 DEG C,
(2) strand that step (1) obtains is joined in smelting furnace, be heated to 725-745 DEG C, after it melts completely, carry out second time sampling analysis after stirring 15-25min, then adjusting temperature to 710-730 DEG C, is that 2-3L/min leads to 60%N2+20%Cl2+20%CO mixed gas refinery by de-gassing 15-20min with gas flow, 20-30min is left standstill after skimming, both analysis is carried out in sampling, and analytical results meets alloying constituent and requires to come out of the stove cast, and teeming temperature is 690-710 DEG C;
(3) the remelting strand that step (2) obtains is carried out Homogenization Treatments in Homogenization Treatments stove: first at 360-420 DEG C, be incubated 4-6h, air cooling to room temperature, then is incubated 5-10h at 475-495 DEG C, and then strong wind cooling is to 220-260 DEG C, insulation 2-3h, air cooling is to room temperature;
(4) by the strand extrusion molding after homogenizing, extrusion temperature is 480-500 DEG C, and extruding rate is 15-20m/min, and then the section bar extruded is adopted air-cooled or water smoke Cooling Quenching online, carry out tension leveling after quenching, tensile deformation amount is 1.5-2.5%;
(5) aluminium alloy extrusions after tension leveling is carried out single-stage aging process: at 100-120 DEG C, be incubated 24-36h, air cooling of coming out of the stove is to room temperature;
Described refining agent by following weight part component form: SODIUMNITRATE 18-24, fluoric acid titanium potassium 5-10, Repone K 33-41, zinc chloride 15-20, sodium sulfate 3-8, phosphorus pentachloride 10-15, Sodium tetrafluoroborate 12-18, aluminum fluoride 8-14, calcium carbonate 16-22, wood charcoal powder 10-15.
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| CN106282701B (en) * | 2016-09-21 | 2018-03-13 | 广东劲胜智能集团股份有限公司 | A kind of die-cast aluminum alloy material, it makes and application method |
| CN108342603A (en) * | 2018-05-16 | 2018-07-31 | 湖北金洋资源股份公司 | A kind of aluminum melt removing sodium |
| CN111560548A (en) * | 2020-06-01 | 2020-08-21 | 凯米特新材料科技有限公司 | High-precision high-strength light aluminum alloy section for high-speed rail and preparation method thereof |
| CN112676371A (en) * | 2021-01-07 | 2021-04-20 | 安徽鑫发铝业有限公司 | Preparation method of high-strength and high-toughness ultrathin hollow high-speed rail aluminum profile |
| CN112813322A (en) * | 2021-02-22 | 2021-05-18 | 山东蓝合智能科技有限公司 | Aviation-grade light high-strength alloy profile and preparation method thereof |
| CN113913651A (en) * | 2021-08-27 | 2022-01-11 | 慈溪市宜美佳铝业有限公司 | Aluminum alloy material with excellent extrudability and preparation method thereof |
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| CN102127665B (en) * | 2010-01-15 | 2012-12-26 | 北京有色金属研究总院 | Al-Zn-Mg-Cu-Sc-Zr-RE alloy capable of being used as ultrahigh-strength cast aluminum alloy |
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