CN107779701A - A kind of 7XXX high strength weldable aluminiums containing Ag and Sc - Google Patents

A kind of 7XXX high strength weldable aluminiums containing Ag and Sc Download PDF

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Publication number
CN107779701A
CN107779701A CN201711282750.2A CN201711282750A CN107779701A CN 107779701 A CN107779701 A CN 107779701A CN 201711282750 A CN201711282750 A CN 201711282750A CN 107779701 A CN107779701 A CN 107779701A
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contents
content
strength
7xxx
alloys
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Inventor
高文林
李国爱
陈军洲
王少华
刘惠
虞朝智
孙进宝
陆政
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AECC Beijing Institute of Aeronautical Materials
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AECC Beijing Institute of Aeronautical Materials
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/10Alloys based on aluminium with zinc as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053Changing 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 zinc as the next major constituent

Abstract

The present invention relates to high strength alumin ium alloy field, more particularly to a kind of 7XXX high strength weldable aluminiums containing Ag and Sc.The material composition and mass percentage content (%) of the soldering alloy be:Its component and mass percent are Zn contents 5.0 10.0%, Mg contents 1.0 3.0%, Cu contents 0.1~2.0%, Mn contents 0.2 0.6%, Zr contents 0.05 0.20%, Ag contents 0.1 1.0%, Sc contents 0.02 0.2%, Ti contents 0.06 0.15%, impurity content Fe≤0.15%, Si≤0.06%, surplus Al.A kind of 7XXX high strength weldable aluminiums provided by the invention, can solve the problems, such as that weld strength is relatively low in current 7A52 aluminum alloy plate materials and other high strength alumin ium alloy plate welding process, weld joint stable difference and weld seam are easy to crack, possess the incomparable superiority of other 7XXX high strength alumin ium alloys, gather around and have broad application prospects.The alloy is applied to 5~120mm stock boards in the fields such as manufacture Aero-Space, weapons, nuclear industry, communications and transportation.

Description

A kind of 7XXX high strength weldable aluminiums containing Ag and Sc
Technical field
The present invention relates to high strength alumin ium alloy field, more particularly to a kind of 7XXX high strength weldable aluminiums containing Ag and Sc.
Background technology
In recent years, to meet other weapons dress such as combat configuration demand, Tank and Armoured Vehicle that my army remotely delivers in the air Standby increasingly urgent to high maneuverability, high reliability and lightweight demand, the aluminum alloy plate materials of a large amount of high intensity are in weaponry In widely use, but due to the requirement of lightweight loss of weight, the connection between aluminum alloy plate materials, which can not use, to be mechanically connected, Zhi Nengxuan Select welding procedure connection scheme.Because high strength alumin ium alloy sheet material is mostly the weldability of material based on Al-Zn-Mg-Cu systems alloy Can be bad, although used 7A52 sheet materials welding performance is preferable, the intensity of material and weld seam is relatively low, the heat endurance of weld seam It is poor, it is easy to crack after weld seam long-term use, have a strong impact on the high performance demands of weaponry of new generation.
Therefore, to solve the above problems, on the basis for not influenceing material combination property, it is necessary to develop it is a kind of it is high-strength can The aluminum alloy materials of weldering.
The content of the invention
It is an object of the invention to provide a kind of 7XXX high strength weldable aluminiums, solve current 7XXX aluminium alloy sheet welds mistake Material and the problem of weld strength is relatively low, weld joint stable difference and weld seam is easy to crack in journey.
The technical scheme is that:The material composition and mass percentage content (%) of the soldering alloy be:Its component And mass percent is Zn contents 5.0-10.0%, Mg content 1.0-3.0%, Cu content 0.1~2.0%, Mn contents 0.2- 0.6%, Zr content 0.05-0.20%, Ag content 0.1-1.0%, Sc content 0.02-0.2%, Ti content 0.06-0.15% is miscellaneous Prime element content F e≤0.15%, Si≤0.06%, surplus Al.
Its component and mass percent are:Zn contents 6.0-9.0%, Mg content 1.2-2.8%, Cu content 0.2~ 1.6%, Mn content 0.2-0.6%, Zr content 0.05-0.20%, Ag content 0.1-1.0%, Sc content 0.02-0.2%, Ti contain Measure 0.06-0.15%, impurity content Fe≤0.15%, Si≤0.06%, surplus Al.
Its component and mass percent are:Zn contents 7.0-8.0%, Mg content 1.2-2.0%, Cu content 0.6~ 1.2%, Mn content 0.2-0.6%, Zr content 0.05-0.20%, Ag content 0.1-1.0%, Sc content 0.02-0.2%, Ti contain Measure 0.06-0.15%, impurity content Fe≤0.15%, Si≤0.06%, surplus Al.
The present invention has the advantage that is with beneficial effect:
1) technical solution of the present invention takes the combined reinforced modes of Zr+Mn, reduces each to different of Al-Zn-Mg-Cu alloy sheet material Property.The trace element such as Zr, Mn, Ag has certain Strengthening and Toughening effect to Al-Zn-Mg-Cu alloy, and addition Ag can promote tiny The precipitation of η ' precipitated phases, expand Mushy Zone scope, so as to improve the cracking resistance of alloy and resistance to elevated temperatures.
2) technical solution of the present invention uses the combined reinforced modes of Zr+Sc, passes through AlZr3And AlSc3Particle suppresses big rolling and become The strength of materials reduces phenomenon caused by recrystal grain is grown up in material structure after shape amount, has both ensured the forming technology of material, The mechanical property of material is not reduced again.
3) technical solution of the present invention is related to high strength weldable aluminium sheet material weld strength is high, good toughness, in welding process Weld seam does not ftracture, and is easy to carry out repair welding, suitable for actual industrial production.
4) a kind of 7XXX high strength weldable aluminiums provided by the invention, can solve current 7A52 aluminum alloy plate materials and its The problem of weld strength is relatively low in his high strength alumin ium alloy plate welding process, weld joint stable difference and weld seam is easy to crack, possesses The incomparable superiority of other 7XXX high strength alumin ium alloys, gathers around and has broad application prospects.The alloy is applied to manufacture aviation boat My god, weapons, nuclear industry, 5~120mm stock boards in the field such as communications and transportation.
Embodiment
A kind of 7XXX high strength weldable aluminiums containing Ag and Sc, each component and mass percent are:Its component and quality hundred Point ratio is Zn content 5.0-10.0%, Mg contents 1.0-3.0%, Cu content 0.1~2.0%, Mn contents 0.2-0.6%, and Zr contains Measure 0.05-0.20%, Ag contents 0.1-1.0%, Sc content 0.02-0.2%, Ti content 0.06-0.15%, impurity content Fe≤0.15%, Si≤0.06%, surplus Al.
A kind of 7XXX high strength weldable aluminium techniques containing Ag and Sc are as follows:
1) include by above-mentioned alloy composition and percentage by weight requirement dispensing, raw material:Pure Al ingots, pure Zn ingots, Pure Mg ingots, Al-Cu intermediate alloys, Al-Mn intermediate alloys, Al-Ti-B intermediate alloys, technical pure Ag, Al-Sc intermediate alloy, Al- Zr intermediate alloys etc.;
2) carry out melting in crucible for smelting stove, the melting orders of raw material be followed successively by pure Al ingots, Al-Zr intermediate alloys, Al-Cu intermediate alloys, pure Zn ingots, Al-Mn intermediate alloys, pure Mg ingots, Al-Ti-B intermediate alloys, Al-Sc intermediate alloys, industry Pure Ag, smelting temperature is in the range of 690-800 DEG C;
3) metallic solution being completely melt is refined, molten metal temperature maintains 700 DEG C~750 DEG C of model during refining In enclosing, refining time 15-20min;
4) vacuum degassing processing, vacuum processing time 20min are carried out after refining;
5) melt stands 10min after application of vacuum, argon gas protection is passed through in crucible furnace, using mechanical stirring device to molten Body stirs 10min, mixing speed 280r/min, then prepares ingot casting using semi-continuous casting, one is stirred every 10min It is secondary, 5min is stirred every time, and until casting is completed, cast temperature is 690-720 DEG C in casting process, casting speed 40-250mm/ Min, cooling water intensity 0.015-0.025MPa;
6) ingot casting of preparation is made annealing treatment, annealing schedule is 450 DEG C, is incubated 18~32h;Ingot casting is carried out again equal Homogenize processing, Homogenization Treatment is (380-430) DEG C × (4-12) h, (465-470) DEG C × (24-40) h;
7) after the ingot casting after homogenization is stripped off the skin, carry out hot rolling etc. and shape, it should be maintained at 350 in forming process~ 465 DEG C of temperature;
8) shape after blank need to through be dissolved, quench and artificial aging heat treatment reach product delivery status, wherein being dissolved Preferably 460~485 DEG C of temperature, cold deformation is carried out after solution treatment to material, and retain 1~5% set deformation volume, when artificial Effect system technique is:1~64h is heated at 120~180 DEG C.
Embodiment 1
A kind of 7XXX high strength weldable aluminiums containing Ag and Sc, each component and mass percent are:Zn contents 5.6%, Mg Content 1.2%, Cu contents 0.2%, Mn contents 0.3%, Zr contents 0.12%, Ag contents 0.6%, Sc contents 0.12%, Ti contains Amount 0.06%, impurity content Fe≤0.15%, Si≤0.06%, surplus Al.
Welding wire preparation technology is as follows:
1) dispensing:Accurate weighing is carried out by above-mentioned alloy composition and percentage by weight requirement, material includes:It is pure Al, pure Zn, pure Mg, Al-Cu intermediate alloys, Al-Mn intermediate alloys, Al-Ti-B intermediate alloys, technical pure Ag, Al-Sc are closed centre Gold, Al-Zr intermediate alloys etc.;
2) melting:Melting is carried out in crucible for smelting stove, pure Al ingots is first added and is heated to 890 DEG C, after all melting Al-Zr intermediate alloys are added, 810 DEG C is warming up to and stirs, 745 DEG C add the rear stirring to be melted of Al-Cu intermediate alloys It is even, continue to add pure Zn at 750 DEG C and melt to stir, 750 DEG C add Al-Mn intermediate alloys and melt and stir, and 715 DEG C add pure Mg and stir, carbon trichloride refining agent 6 is then added at 738 DEG C wraps and vacuumize 20min, exists respectively 735 DEG C add Al-Ti-B intermediate alloys and Al-Sc intermediate alloys with 745 DEG C and stir respectively, are finally added at 810 DEG C Technical pure Ag simultaneously stirs, and molten metal is gone into tundish when molten metal temperature drops to 710 DEG C stands, and time of repose is not low In 30min;
3) semi-continuous casting:After sufficient standing, ingot casting is prepared using semi-continuous casting, fire door temperature maintains 700~720 DEG C, it is stirred once every 10min, stirs 5min, casting speed 40mm/min every time, until casting completion, casting process Middle cast temperature is 690 DEG C, cooling water intensity 0.015MPa, and cast ingot dimension is 420mm × 1500mm × 4500mm,;
4) annealing and homogenization:The ingot casting of preparation is made annealing treatment, annealing schedule is 450 DEG C × 24h;Again by ingot casting Homogenization Treatments are carried out, Homogenization Treatment is 400 DEG C × 6h, 475 DEG C × 28h.;
5) roll:Ingot casting after homogenization is stripped off the skin and carries out hot rolling to 400mm × 1460mm × 2000mm, is rolled into 5mm × 1500mm × 5000mm specific standard sheet materials, blank is maintained between 360~450 DEG C in forming process;
6) solid solution and aging strengthening model:Sheet material after shaping carries out 480 DEG C × 8h solution treatment, and sheet material is entered after quenching Row pre-stretching cold deformation, deflection 3%, carries out artificial aging processing, technique is 125 DEG C × 24h after pre-stretching to sheet material.
Embodiment 2
A kind of 7XXX high strength weldable aluminiums containing Ag and Sc, each component and mass percent are:Zn contents 7.8%, Mg Content 1.6%, Cu contents 0.8%, Mn contents 0.4%, Zr contents 0.10%, Ag contents 0.4%, Sc contents 0.06%, Ti contains Amount 0.07%, impurity content Fe≤0.15%, Si≤0.06%, surplus Al.
Welding wire preparation technology is as follows:
1) dispensing:Accurate weighing is carried out by above-mentioned alloy composition and percentage by weight requirement, material includes:It is pure Al, pure Zn, pure Mg, Al-Cu intermediate alloys, Al-Mn intermediate alloys, Al-Ti-B intermediate alloys, technical pure Ag, Al-Sc are closed centre Gold, Al-Zr intermediate alloys etc.;
2) melting:Melting is carried out in crucible for smelting stove, pure Al ingots is first added and is heated to 887 DEG C, after all melting Al-Zr intermediate alloys are added, 800 DEG C is warming up to and stirs, 748 DEG C add the rear stirring to be melted of Al-Cu intermediate alloys It is even, continue to add pure Zn at 750 DEG C and melt to stir, 760 DEG C add Al-Mn intermediate alloys and melt and stir, and 720 DEG C add pure Mg and stir, carbon trichloride refining agent 8 is then added at 740 DEG C wraps and vacuumize 20min, exists respectively 740 DEG C add Al-Ti-B intermediate alloys and Al-Sc intermediate alloys with 750 DEG C and stir respectively, are finally added at 805 DEG C Technical pure Ag simultaneously stirs, and molten metal is gone into tundish when molten metal temperature drops to 710 DEG C stands, and time of repose is not low In 30min;
3) semi-continuous casting:After sufficient standing, ingot casting is prepared using semi-continuous casting, fire door temperature maintains 700~720 DEG C, it is stirred once every 10min, stirs 5min, casting speed 30mm/min every time, until casting completion, casting process Middle cast temperature is 700 DEG C, cooling water intensity 0.015MPa, and cast ingot dimension is 500mm × 1800mm × 4000mm,;
4) annealing and homogenization:The ingot casting of preparation is made annealing treatment, annealing schedule is 450 DEG C × 26h;Again by ingot casting Homogenization Treatments are carried out, Homogenization Treatment is 400 DEG C × 8h, 478 DEG C × 30h;
5) roll:Ingot casting after homogenization is stripped off the skin and carries out hot rolling to 470mm × 1760mm × 2000mm, is rolled into 60mm × 2000mm × 7000mm specific standard sheet materials, blank is maintained between 360~460 DEG C in forming process;
6) solid solution and aging strengthening model:Sheet material after shaping carries out 480 DEG C × 9h solution treatment, and sheet material is entered after quenching Row pre-stretching cold deformation, deflection 4%, carries out artificial aging processing, technique is 140 DEG C × 16h after pre-stretching to sheet material.
Embodiment 3
A kind of 7XXX high strength weldable aluminiums containing Ag and Sc, each component and mass percent are:Zn contents 9.2%, Mg Content 1.8%, Cu contents 1.0%, Mn contents 0.35%, Zr contents 0.10%, Ag contents 0.9%, Sc contents 0.10%, Ti contains Amount 0.06%, impurity content Fe≤0.15%, Si≤0.06%, surplus Al.
Welding wire preparation technology is as follows:
1) dispensing:Accurate weighing is carried out by above-mentioned alloy composition and percentage by weight requirement, material includes:It is pure Al, pure Zn, pure Mg, Al-Cu intermediate alloys, Al-Mn intermediate alloys, Al-Ti-B intermediate alloys, technical pure Ag, Al-Sc are closed centre Gold, Al-Zr intermediate alloys etc.;
2) melting:Melting is carried out in crucible for smelting stove, pure Al ingots is first added and is heated to 887 DEG C, after all melting Al-Zr intermediate alloys are added, 800 DEG C is warming up to and stirs, 748 DEG C add the rear stirring to be melted of Al-Cu intermediate alloys It is even, continue to add pure Zn at 750 DEG C and melt to stir, 760 DEG C add Al-Mn intermediate alloys and melt and stir, and 720 DEG C add pure Mg and stir, carbon trichloride refining agent 8 is then added at 740 DEG C wraps and vacuumize 20min, exists respectively 740 DEG C add Al-Ti-B intermediate alloys and Al-Sc intermediate alloys with 750 DEG C and stir respectively, are finally added at 805 DEG C Technical pure Ag simultaneously stirs, and molten metal is gone into tundish when molten metal temperature drops to 710 DEG C stands, and time of repose is not low In 30min;
3) semi-continuous casting:After sufficient standing, ingot casting is prepared using semi-continuous casting, fire door temperature maintains 700~720 DEG C, it is stirred once every 10min, stirs 5min, casting speed 30mm/min every time, until casting completion, casting process Middle cast temperature is 700 DEG C, cooling water intensity 0.015MPa, and cast ingot dimension is 500mm × 1800mm × 4000mm,;
4) annealing and homogenization:The ingot casting of preparation is made annealing treatment, annealing schedule is 450 DEG C × 26h;Again by ingot casting Homogenization Treatments are carried out, Homogenization Treatment is 400 DEG C × 8h, 478 DEG C × 30h;
5) roll:Ingot casting after homogenization is stripped off the skin and carries out hot rolling to 470mm × 1760mm × 2000mm, is rolled into 60mm × 2000mm × 7000mm specific standard sheet materials, blank is maintained between 360~460 DEG C in forming process;
6) solid solution and aging strengthening model:Sheet material after shaping carries out 480 DEG C × 9h solution treatment, and sheet material is entered after quenching Row pre-stretching cold deformation, deflection 4%, carries out artificial aging processing, technique is 140 DEG C × 16h after pre-stretching to sheet material.

Claims (3)

1. a kind of 7XXX high strength weldable aluminiums containing Ag and Sc, it is characterised in that its component and mass percent are:Zn contents 5.0-10.0%, Mg content 1.0-3.0%, Cu content 0.1~2.0%, Mn contents 0.2-0.6%, Zr content 0.05- 0.20%, Ag content 0.1-1.0%, Sc content 0.02-0.2%, Ti content 0.06-0.15%, impurity content Fe≤ 0.15%, Si≤0.06%, surplus Al.
A kind of 2. 7XXX high strength weldable aluminiums containing Ag and Sc according to claim 1, it is characterised in that its component and Mass percent is:Zn contents 6.0-9.0%, Mg content 1.2-2.8%, Cu content 0.2~1.6%, Mn contents 0.2- 0.6%, Zr content 0.05-0.20%, Ag content 0.1-1.0%, Sc content 0.02-0.2%, Ti content 0.06-0.15% is miscellaneous Prime element content F e≤0.15%, Si≤0.06%, surplus Al.
A kind of 3. 7XXX high strength weldable aluminiums containing Ag and Sc according to claim 1, it is characterised in that its component and Mass percent is:Zn contents 7.0-8.0%, Mg content 1.2-2.0%, Cu content 0.6~1.2%, Mn contents 0.2- 0.6%, Zr content 0.05-0.20%, Ag content 0.1-1.0%, Sc content 0.02-0.2%, Ti content 0.06-0.15% is miscellaneous Prime element content F e≤0.15%, Si≤0.06%, surplus Al.
CN201711282750.2A 2017-12-06 2017-12-06 A kind of 7XXX high strength weldable aluminiums containing Ag and Sc Pending CN107779701A (en)

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Cited By (4)

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CN108642348A (en) * 2018-06-05 2018-10-12 湖南东方钪业股份有限公司 A kind of Al-Zn-Mg line aluminium alloys proximate matter and preparation method thereof
CN109955003A (en) * 2019-03-27 2019-07-02 中国航发北京航空材料研究院 High-strength, anti-corrosion Al-Mg-Zr aluminium alloy welding wire and preparation method thereof
CN110468313A (en) * 2019-08-02 2019-11-19 中国航发北京航空材料研究院 A kind of high intensity closed-cell foam aluminium alloy and preparation method thereof
CN111850436A (en) * 2020-07-29 2020-10-30 中南大学 Heat treatment method for simultaneously improving strength of high-strength and high-toughness aluminum alloy matrix and strength of welded joint

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CN110468313A (en) * 2019-08-02 2019-11-19 中国航发北京航空材料研究院 A kind of high intensity closed-cell foam aluminium alloy and preparation method thereof
CN111850436A (en) * 2020-07-29 2020-10-30 中南大学 Heat treatment method for simultaneously improving strength of high-strength and high-toughness aluminum alloy matrix and strength of welded joint

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