CN101380703A - Multiple microalloying scandium-containing hydronalium welding wire and preparation method thereof - Google Patents
Multiple microalloying scandium-containing hydronalium welding wire and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a multi-element microalloyed scandium-containing aluminum-magnesium alloy series welding stick and a preparation method thereof. The components and the weight percentage of the multi-element microalloyed scandium-containing aluminum-magnesium alloy series welding stick are as follows: 4.0 to 6.0 percent of magnesium, 0 to 1.0 percent of zinc, 0.4 to 1.0 percent of manganese, 0.05 to 0.2 percent of zirconium, 0.10 to 0.40 percent of scandium, 0.10 to 0.40 percent of erbium and/or yttrium and the rest is aluminum. The Al-Mg welding stick applied by the invention has the advantages that: (1) the tissues of the welding line are uniformly thinned into spherical grains and have higher thermal stability; (2) the thermal-cracking resistance is obviously enhanced; (3) the obdurability of a welding joint is excellent; (4) the welding joint has excellent resistance for the stress etching of ocean-atmosphere; (5) a welding technique window is enlarged.
Description
Technical field
The present invention relates to a kind of multicomponent microalloying that is used for aluminium-zinc-magnesium (Al-Zn-Mg) series high-strength aluminum alloy and the melting of aluminium-magnesium (Al-Mg) line aluminium alloy and contain scandium magnalium (Al-Mg) serial alloy welding wire and preparation method thereof.
Background technology
The Al-Zn-Mg line aluminium alloy be typical in high-strength heat-treatable strengthened alloy, have good welding performance, plasticity and processing characteristics, it is the main lightweight structural material of building, surface car, Aero-Space and military applications equipment, its consumption is the trend that rises year by year, all adopting Al-Zn-Mg as most of member of 25mm mountain region antiaircraft gun is alloy (7A52 alloy) manufacturing, and can weld Al-Zn-Mg by force in main employing of new-type river crossing bridge equipment is that alloy (7005 alloy) is welded.
At the aluminum alloy melting welding field, non-heat treatment reinforcement magnalium serial alloy welding wire is to use the most a kind of, accounts for more than 50% of whole aluminium alloy packing material use amount at present, and its typical trade mark is ER5356.The advantage of ER5356 alloy welding wire is that intensity is moderate, heat crack resistance is relative with decay resistance better.But along with the continuous improvement of high-strength aluminum alloy performance and the raising of attaching parts reliability requirement in the Al-Zn-Mg system, the requirement of strength of high-strength aluminum alloy welding point during traditional Al-Mg alloy welding wire such as ER5356 can not satisfy, especially for the large component that can not heat-treat after thick plates and the welding, press for heat resistanceheat resistant and split the high strength aluminum alloy welding wire better, to satisfy the more bonding strength and the reliability needs of multiple-project parts with anti-stress corrosion performance.
In to the aluminium alloy capability Study of Lifting, find that scandium (Sc) is the most effective up to now alloying element.Scandium becomes strong grain refiner of aluminium alloy and effective crystallization inhibitor again, and the structure and the performance of alloy produced significantly influence, and the adding of an amount of scandium makes the intensity, hardness, welding performance, decay resistance etc. of aluminium alloy be greatly improved.Its strengthening mechanism is: except that a small amount of solid solution, major part is with Al in aluminium alloy for scandium
3The Sc particle form is separated out, i.e. the nascent Al of casting
3The secondary Al of Sc and hot-working
3Sc. the former has identical lattice types and extremely low coherence mismatch with aluminum substrate, becomes effective heterogeneous body nucleus, and refinement alloy casting state grain structure improves alloy strength; The latter further improves intensity and suppresses alloy recrystallization by the prevention of dislocation pinning and sub boundary, makes alloy all can keep stable non-recrystallized structure in hot-working or annealing in process state, thereby keeps its good toughness and tenacity.
Add Sc in aluminium alloy, seek out enough desirable grain refining effect, there is a critical concentration in Sc content.Requirement must be added Sc content to hypereutectic composition (greater than 0.55%Sc) in aluminium alloy, separate out nascent Al in the time of just making the alloy melt crystallization
3The Sc phase becomes the heterogeneous body core.And Al
3The Sc particle also exists the trend of the alligatoring that is easy to reunite, and its heat endurance is still inadequate.Though Al-Sc system eutectic composition is very low, because Sc costs an arm and a leg, cost of alloy will increase considerably, and therefore have a strong impact on research, the development and application that contains scandium-aluminum alloy.
Adopt other transition elements or rare earth element Zr, experiment and thought that Ti etc. are compound with Sc can effectively solve alligatoring and cost problem.Beneficial effect when the compound interpolation of scandium and other element has not only kept adding scandium separately, and can improve particle heat endurance, Al
3Sc can make Al mutually
3The Sc facies evolution forms Al
3(Sc, Zr) compound particle further reduce the mismatch with aluminum substrate.The combined microalloying research that contains the scandium magnalium and be alloy has also obtained good effect.To adopting Sc and zirconium (Zr) combined microalloying to study, can significantly improve the intensity of alloy in the Al-5Mg alloy, its tensile strength and regulation disproportional extension strength increment reach 84MPa and 91MPa respectively.
It is found that in recent years rare earth element er (Er) is joined the remarkable refinement alloy grain of energy in the Al-Zn-Mg alloy, increase substantially alloy strength, suppress crystallization again; The small and dispersed phase Al that Er forms in aluminium alloy
3Er and Al
3The Sc structure is identical, and lattice paprmeter is approaching, and its refinement, invigoration effect are remarkable.
For 7 is the welding of Al-Zn-Mg aluminium alloy, domestic main employing homogeneity or heterogeneous welding wire at present.For common solder wire material Al-Mg and Al-Si, being applied to 7 is that the mother metal welding time should avoid the silicon of high-load to exist, thereby should adopt the Al-Mg system as welding material.But homogeneity welding wire and traditional Al-Mg line aluminium alloy welding wire element such as magnesium and zinc volatilization oxidization burning loss in welding process seriously make strength of joint be starkly lower than strength of parent.For the aluminum alloy materials with more and more higher instructions for use, it also progressively improving, especially has higher requirement to welding hot tearing and Sensitivity of Stress Corrosion under the desired strength to the requirement of welding quality.But the welding wire (as ER5356) of the choosing of incense at present obviously deficiency thinks that Al-Zn-Mg system and Al-Mg line aluminium alloy provide good welding matching, and the demand to the high-performance solder wire material on the engineering is very urgent.
Summary of the invention
One of purpose of the present invention provides the Al-Mg alloy welding wire with higher-strength of a kind of Al-Zn-Mg of satisfying series high strength aluminium alloy and Al-Mg line aluminium alloy through engineering approaches welding usefulness, the unique distinction of this soldering wire alloy is, can obtain the excellent more structure property and the welding procedure window of expansion under the low content alloy element condition, can reduce weld seam alloy welding hot cracking tendency, postwelding can obtain higher strength of joint, and have the performance of good anti-marine atmosphere stress corrosion, can be used for the welding of large thick-wall aluminium alloy part.
For achieving the above object, the present invention takes following technical scheme:
A kind of multiple microalloying scandium-containing hydronalium welding silk, its constituent and percentage by weight (wt.%) are: magnesium (Mg) 4.0～6.0, zinc (Zn) 0～1.0, manganese (Mn) 0.4～1.0, zirconium (Zr) 0.05～0.2, scandium (Sc) 0.10～0.40, erbium (Er) and/or yttrium (Yb) 0.10～0.40, aluminium (Al) surplus.
A kind of optimal technical scheme is characterized in that: the content of described scandium is 0.15～0.2.
A kind of optimal technical scheme is characterized in that: the content≤0.005 weight % of titanium in the described multiple microalloying scandium-containing hydronalium welding wire bond silk alloying component.
Composition design considerations of the present invention is as follows:
According to people for many years to containing being fruitful of scandium-aluminum alloy basic research, to the exploitation that the new A l-Mg series solder wire material of using towards welding is transferred in the basic research of the performance of aluminium alloy be come up, realize the new lifting of aluminium alloy welding wire aluminium alloy welding quality.On the basis of combined microalloying, adopt the compound interpolation of scandium (Sc) zirconium (Zr), at first obtain to have to a certain degree thinning microstructure and the welding wire matrix alloy of excellent comprehensive performance; On this basis, rare earth element er (Er) with low cost, as to have better thinning effect and corrosion resistance and yttrium (Yb) are introduced, the ternary or the quaternary that form scandium (Sc) zirconium (Zr) erbium (Er) or yttrium (Yb) are compound, in the hope of forming the compound particle that mates more with aluminum substrate, increase the effect of the density and the precipitation strength of heterogeneous forming core, also can further reduce simultaneously the micro alloying element crucial component under the equal alloying effect, reduce the welding wire cost, improve the corrosion resistance of welding point; Can generate thick non-coherence particle mutually when considering titanium (Ti) with erbium (Er) or yttrium (Yb) coexistence, Ti in traditional welding wire is rejected away, the nucleation ability of compound particle be can further increase like this, and more scandium (Sc), erbium (Er) and yttrium (Yb) discharged to produce more primary and secondary particle; Manganese (Mn) element adopts as the welding wire common element, can improve the intensity and the corrosion resistance of alloy; Introducing a certain amount of zinc (Zn), is the mother metal welding for Al-Zn-Mg, can play certain element supplementary function, makes mother metal with the continuous transition on the weld seam alloy realization chemical composition; The refined crystalline strengthening that realizes by the combined microalloying of optimizing, when the Al-Mg of high-load magnesium (Mg) is alloy strength in the raising, the stress corrosion inclination that also can avoid the solution strengthening because of high-load magnesium to bring.By the uniform crystal particles refinement, refined crystalline strengthening and precipitation strength, realize the low hot tearing tendency of welding material, the low stress corrosion tendency, the high corrosion resistance energy, high strength of welded joint and plasticity and the good fineness that shows overcoming the corresponding weakness of conventional Al-Mg welding wire (5356 alloy), and further promote the welding performance that contains the scandium-aluminum alloy welding wire.
Another object of the present invention provides a kind of preparation method of multiple microalloying scandium-containing hydronalium welding silk.
Above-mentioned purpose of the present invention reaches by the following technical programs, and guarantees that the Composition Control precision and the low hydrogen protoxide of aluminium alloy containing magnesium welding wire are mingled with:
(1) raw material preparation: aluminium (Al), magnesium (Mg), zinc (Zn) add with form of pure metal, and alloying element manganese (Mn), scandium (Sc), zirconium (Zr), erbium (Er) and/or yttrium (Yb) all add with Al base intermediate alloy form;
(2) alloy melting: adopt vaccum sensitive stove, under forvacuum and applying argon gas protective condition, carry out the alloy casting; After treating during melting to rise to 780 ℃ after metal charge (fine aluminium and intermediate alloy Al-10Mn, Al-2Sc, Al-4Zr, Al-10Er and Al-10Yb) all melts, magnesium metal and zinc are pressed into after coating with aluminium foil at last; Be fully existing thick intermetallic compound particles in the fusion intermediate alloy, improve the effect of dehydrogenation and take into account and prevent that magnesium from excessively volatilizing that smelting temperature is decided to be 750 ℃～800 ℃; Smelting time 20 minutes; Pouring temperature is 730 ℃;
Perhaps adopt the resistance furnace melting, at coverture (10%CaF
2+ 67%MgCl+15%CaCl
2Or MgF
2) protection is melted down, cleaning molten, is cast into alloy pig after outgasing and skimming.
(3) shape: to alloy cast ingot crop peeling, be hot extruded into thin footpath (≤φ 10) wire rod behind homogenizing annealing, 420～450 ℃ of heating-up temperatures are processed into the continuous plate-like welding wire of certain specification size by multi-pass drawing (containing intermediate annealing).
Using Sc of the present invention, Zr, Er multi-element composite micro-alloying Al-Mg serial alloy welding wire molten solder Al-Zn-Mg is that alloy and Al-Mg are alloy, the weld seam alloy has obtained the tissue of tiny homogeneous, the welding point hot cracking tendency obviously descends, and corrosion resistance is good, has comprehensive mechanical property.Adopt multi-element composite micro-alloying Al-Mg welding wire welding of the present invention (manual argon arc welding and argonaut welding welding) 7A52 (Al-Zn-Mg system) thick aluminum alloy plate (δ=20～60mm), obtained every good experimental result: (1) is under the situation of no post weld heat treatment, welding point tensile strength (no reinforcement) can reach 340～450MPa, with compare with the joint that adopts traditional Al-Mg welding wire (ER5356) under the condition, joint tensile strength improves 80～120MPa, and percentage elongation can improve 30%～50%; (2) generation of HOT CRACK FOR WELDING P tendency is less.Adopt fish-bone sample and cross sample to estimate according to GB, weld crack tendency COEFFICIENT K
1＜8%, nearly seam district liquation crack tendency COEFFICIENT K
2=0; (3) significantly evenly refinement and have higher heat endurance of seam organization.Seam organization is the tiny spherical equi-axed crystal of homogeneous, and grain size can reach 20 μ m, and the fusion area does not have tangible columnar zone to the transition of weld metal zone and exists, and has a large amount of tiny Al in the alloy
3(Sc, Zr), Al
3(Sc, Zr, Er) and Al
3(Yb) particle, these particles have produced very strong precipitation strength effect for Sc, Zr.These particles and weld seam alloy grain all have good heat endurance under the annealed condition; (4) welding point has the performance of good anti-marine atmosphere stress corrosion.Adopt simulated seawater salt air corrosion experiment and stress corrosion contrast experiment,, only have 3 crackle is arranged in 9 samples, the no significant change of low power metallographic structure contrast through examination in 96 hours.
Al-Mg welding wire provided by the invention, refinement the crystal grain of weld seam fusion zone, make the fusion area form tiny equiax crystal layer, the molten bath melt has good flowability and feeding capacity when solidifying, stop the forming core and the expansion of crackle, thereby significantly reduce weld crack tendentiousness.Solution strengthening, refined crystalline strengthening and precipitation strength effect make welding point obtain advantages of higher tensile strength and good plasticity.Manganese, the existence of scandium and erbium and/or yttrium, with and composite alloying due to element be evenly distributed and grain refinement, be the reason that the weld seam alloy has excellent corrosion resistance.Therefore, use the welding point of Al-Mg welding wire welding of the present invention not only to have high intensity but also also have high stress corrosion resistant stability.
The present invention is for improving the degree of purity of weld metal; operations such as the raw material of welding wire and melting, extruding, drawing have all been carried out strict control; as adopt high pure metal and intermediate alloy raw material thereof; preferred vacuum, argon shield founding to be improving the degree of purity of welding wire, and generation mutually provides solid foundation with frangible compounds in order effectively to prevent to weld defective such as pore.Though therefore owing to the dilution of matrix alloy element in the welding, alloying element such as Sc, Zr reduces in the weld seam, can guarantee also that according to the designed composition of the present invention the intensity of weld metal makes it suitable with mother metal, thereby realize improving the purpose of joint toughness and tenacity.
The present invention will be further described below by the specific embodiment, but and do not mean that restriction to the present invention protection.
The specific embodiment
Embodiment 1
A kind of multiple microalloying scandium-containing hydronalium welding silk, its chemical composition (wt%) is: magnesium (Mg) 4.5, manganese (Mn) 0.4, zinc (Zn) 0.5, zirconium (Zr) 0.05, scandium (Sc) 0.12, erbium (Er) 0.10, yttrium (Yb) 0.10, aluminium (Al) surplus.
Preparation:
(1) raw material preparation: aluminium (Al), magnesium (Mg), zinc (Zn) add with form of pure metal, and alloying element manganese (Mn), scandium (Sc), zirconium (Zr), erbium (Er), yttrium (Yb) all add with Al base intermediate alloy form;
(2) alloy melting: adopt vaccum sensitive stove, under preheating furnace feeding pre-evacuating and argon-filled protection condition, carry out alloy melting, treat all fusings of metal charge (fine aluminium and intermediate alloy Al-10Mn, Al-2Sc, Al-4Zr, Al-10Er and Al-10Yb) during melting, after being warming up to 780 ℃ again, magnesium metal and zinc are pressed into after coating with aluminium foil at last; Be fully existing thick intermetallic compound particles in the fusion intermediate alloy, improve the effect of dehydrogenation and take into account and prevent that magnesium from excessively volatilizing that smelting temperature is decided to be 750 ℃; Smelting time 20 minutes; Cast temperature is 730 ℃; Be cast into φ 120mm alloy pig;
(3) shape: to the peeling of alloy cast ingot crop, be hot extruded into thin footpath (≤φ 10) wire rod behind 450 ℃ of homogenizing annealings, 420～450 ℃ of heating-up temperatures are squeezed into carefully rod of three φ 9.5mm, and annealing, drawing are the continuous plate-like welding wire of φ 1.6mm again;
(4) continuously welding wire through oil removing, cleaning, oven dry, be used for manual welding or weldering automatically behind the drum again.
Embodiment 2
A kind of multiple microalloying scandium-containing hydronalium welding silk, its chemical composition (wt%) is: magnesium (Mg) 5.0, manganese (Mn) 0.6, zinc (Zn) 0.8, zirconium (Zr) 0.17, scandium (Sc) 0.35, erbium (Er) 0.20, yttrium (Yb) 0.10, aluminium (Al) surplus.
Preparation:
(1) raw material preparation: aluminium (Al), magnesium (Mg), zinc (Zn) add with form of pure metal, and alloying element manganese (Mn), scandium (Sc), zirconium (Zr), erbium (Er), yttrium (Yb) all add with Al base intermediate alloy form;
(2) alloy melting: adopt the resistance furnace melting, at coverture (10%CaF
2+ 67%MgCl+15%CaCl
2Or MgF
2) protection melts and cleaning molten down, is cast into φ 120mm alloy pig after outgasing and skimming;
(3) shape: to the peeling of alloy cast ingot crop, be hot extruded into thin footpath (≤φ 10) wire rod behind 450 ℃ of homogenizing annealings, 420～450 ℃ of heating-up temperatures are squeezed into carefully rod of three φ 9.5mm, and annealing, drawing are the continuous plate-like welding wire of φ 1.6mm again;
(4) continuously welding wire through oil removing, cleaning, oven dry, be used for manual welding or weldering automatically behind the drum again.
Embodiment 3
A kind of multiple microalloying scandium-containing hydronalium welding silk, its chemical composition (wt%) is: magnesium (Mg) 5.5, manganese (Mn) 0.7, zinc (Zn) 1.0, zirconium (Zr) 0.20, scandium (Sc) 0.4, erbium (Er) 0.2, yttrium (Yb) 0.2, aluminium (Al) surplus.
(1) raw material preparation: aluminium (Al), magnesium (Mg), zinc (Zn) add with form of pure metal, and alloying element manganese (Mn), scandium (Sc), zirconium (Zr), erbium (Er), yttrium (Yb) all add with Al base intermediate alloy form;
(2) alloy melting: adopt the resistance furnace melting, at coverture (10%CaF
2+ 67%MgCl+15%CaCl
2Or MgF
2) protection is melted down, composition adjustment and cleaning molten, is cast into alloy pig after outgasing and skimming; Magnesium metal adds at last during melting, and after promptly treating to rise to a certain temperature after metal charge all melts, pure magnesium is pressed into after coating with aluminium foil; Be cast into φ 120mm alloy pig;
(3) shape: to the peeling of alloy cast ingot crop, be hot extruded into thin footpath (≤φ 10) wire rod behind 450 ℃ of homogenizing annealings, 420～450 ℃ of heating-up temperatures are squeezed into carefully rod of three φ 9.5mm, and annealing, drawing are the continuous plate-like welding wire of φ 1.6mm again;
(4) continuously welding wire through oil removing, cleaning, oven dry, be used for manual welding or weldering automatically behind the drum again.
Embodiment 4
Its chemical composition (wt%) is: magnesium (Mg) 5.5, manganese (Mn) 0.65, zinc (Zn) 0.8, zirconium (Zr) 0.10, scandium (Sc) 0.20, erbium (Er) 0.15, yttrium (Yb) 0.20, aluminium (Al) surplus.
Preparation:
(1) raw material preparation: aluminium (Al), magnesium (Mg), zinc (Zn) add with form of pure metal, and alloying element manganese (Mn), scandium (Sc), zirconium (Zr), erbium (Er), yttrium (Yb) all add with Al base intermediate alloy form;
(2) alloy melting: adopt vaccum sensitive stove, under forvacuum and applying argon gas protective condition, carry out the alloy casting; After treating during melting to rise to 780 ℃ after metal charge (fine aluminium and intermediate alloy Al-10Mn, Al-2Sc, Al-4Zr, Al-10Er and Al-10Yb) all melts, magnesium metal and zinc are pressed into after coating with aluminium foil at last; Be fully existing thick intermetallic compound particles in the fusion intermediate alloy, improve the effect of dehydrogenation and take into account and prevent that magnesium from excessively volatilizing that smelting temperature is decided to be 800 ℃; Smelting time 20 minutes; Cast temperature is 730 ℃; Be cast into φ 120mm alloy pig;
(3) shape: to the peeling of alloy cast ingot crop, be hot extruded into thin footpath (≤φ 10) wire rod behind 450 ℃ of homogenizing annealings, 420～450 ℃ of heating-up temperatures are squeezed into carefully rod of three φ 9.5mm, and annealing, drawing are the continuous plate-like welding wire of φ 1.6mm again;
(4) continuously welding wire through oil removing, cleaning, oven dry, be used for manual welding or weldering automatically behind the drum again.
Embodiment 5
Its chemical composition (wt%) is: magnesium (Mg) 5.8, manganese (Mn) 0.55, zinc (Zn) 0.7, zirconium (Zr) 0.12, scandium (Sc) 0.25, erbium (Er) 0.30, aluminium (Al) surplus.
Preparation:
(1) raw material preparation: aluminium (Al), magnesium (Mg), zinc (Zn) add with form of pure metal, and alloying element manganese (Mn), scandium (Sc), zirconium (Zr) all add with Al base intermediate alloy form;
(2) alloy melting: adopt the resistance furnace melting, under special-purpose coverture protection, melt, composition adjustment and cleaning molten, be cast into alloy pig through the degassing with after skimming; Magnesium metal adds at last during melting, and after promptly treating to rise to a certain temperature after metal charge all melts, pure magnesium is pressed into after coating with aluminium foil; Be cast into φ 120mm alloy pig;
(3) shape: to the peeling of alloy cast ingot crop, be hot extruded into thin footpath (≤φ 10) wire rod behind 450 ℃ of homogenizing annealings, 420～450 ℃ of heating-up temperatures are squeezed into carefully rod of three φ 9.5mm, and annealing, drawing are the continuous plate-like welding wire of φ 1.6mm again;
(4) continuously welding wire through oil removing, cleaning, oven dry, be used for manual welding or weldering automatically behind the drum again.
Embodiment 6
Its chemical composition (wt%) is: magnesium (Mg) 6.0, manganese (Mn) 0.60, zinc (Zn) 0, zirconium (Zr) 0.15, scandium (Sc) 0.30, yttrium (Yb) 0.3, aluminium (Al) surplus.
Preparation:
(1) raw material preparation: aluminium (Al), magnesium (Mg), zinc (Zn) add with form of pure metal, and alloying element manganese (Mn), scandium (Sc), zirconium (Zr), yttrium (Yb) all add with Al base intermediate alloy form;
(2) alloy melting: adopt vaccum sensitive stove, under forvacuum and applying argon gas protective condition, carry out the alloy casting; After treating during melting to rise to 780 ℃ after metal charge (fine aluminium and intermediate alloy Al-10Mn, Al-2Sc, Al-4Zr and Al-10Yb) all melts, magnesium metal and zinc are pressed into after coating with aluminium foil at last; Be fully existing thick intermetallic compound particles in the fusion intermediate alloy, improve the effect of dehydrogenation and take into account and prevent that magnesium from excessively volatilizing that holding temperature is decided to be 750 ℃; Smelting time 20 minutes; Cast temperature is 730 ℃; Be cast into φ 120mm alloy pig;
(3) shape: to the peeling of alloy cast ingot crop, be hot extruded into thin footpath (≤φ 10) wire rod behind 450 ℃ of homogenizing annealings, 420～450 ℃ of heating-up temperatures are squeezed into carefully rod of three φ 9.5mm, and annealing, drawing are the continuous plate-like welding wire of φ 1.6mm again;
(4) continuously welding wire through oil removing, cleaning, oven dry, be used for manual welding or weldering automatically behind the drum again.
Adopt above-mentioned multi-element composite micro-alloying Al-Mg welding wire welding (manual argon arc welding and argonaut welding welding) 7A52 (Al-Zn-Mg system) thick aluminum alloy plate (δ=20～60mm) have obtained every good experimental result:
(1) under the situation of no post weld heat treatment, welding point tensile strength (no reinforcement) can reach 340～450MPa, with compare with the joint that adopts traditional Al-Mg welding wire (ER5356) under the condition, joint tensile strength improves 80～120MPa, percentage elongation can improve 30%～50%;
(2) generation of HOT CRACK FOR WELDING P tendency is less.Adopt fish-bone sample and cross sample to estimate according to GB, weld crack tendency COEFFICIENT K
1＜8%, nearly seam district liquation crack tendency COEFFICIENT K
2=0;
(3) significantly evenly refinement and have higher heat endurance of seam organization.Seam organization is the tiny spherical equi-axed crystal of homogeneous, and grain size can reach 20 μ m, and the fusion area does not have tangible columnar zone to the transition of weld metal zone and exists.
(4) welding point has the performance of good anti-marine atmosphere stress corrosion.Adopt simulated seawater salt air corrosion experiment and stress corrosion contrast experiment,, only have 3 crackle is arranged in 9 samples, the no significant change of low power metallographic structure contrast through examination in 96 hours.
Claims (5)
1, a kind of multiple microalloying scandium-containing hydronalium welding silk, its constituent and percentage by weight are: magnesium 4.0～6.0, zinc 0～1.0, manganese 0.4～1.0, zirconium 0.05～0.2, scandium 0.10～0.40, erbium and/or yttrium 0.10～0.40, aluminium surplus.
2, multiple microalloying scandium-containing hydronalium welding silk according to claim 1 is characterized in that: the content of described scandium is 0.15～0.2.
3, multiple microalloying scandium-containing hydronalium welding silk according to claim 1 is characterized in that: the content≤0.005 weight % of titanium in the described multiple microalloying scandium-containing hydronalium welding wire bond silk alloying component.
4, the preparation method of the described alloy welding wire of a kind of claim 1, its step is as follows:
(1) raw material preparation: aluminium (Al), magnesium (Mg), zinc (Zn) add with form of pure metal, and alloying element manganese (Mn), scandium (Sc), zirconium (Zr), erbium (Er) and/or yttrium (Yb) all add with Al base intermediate alloy form;
(2) alloy melting:
Adopt vaccum sensitive stove, under forvacuum and applying argon gas protective condition, carry out the alloy casting; After treating during melting to rise to 780 ℃ after metal charge (fine aluminium and intermediate alloy Al-10Mn, Al-2Sc, Al-4Zr, Al-10Er and Al-10Yb) all melts, magnesium metal and zinc are pressed into after coating with aluminium foil at last; Be fully existing thick intermetallic compound particles in the fusion intermediate alloy, improve the effect of dehydrogenation and take into account and prevent that magnesium from excessively volatilizing that smelting temperature is decided to be 750 ℃～800 ℃; Smelting time 20 minutes; Cast temperature is 730 ℃;
Perhaps adopt the resistance furnace melting, at coverture: 10%CaF
2+ 67%MgCl+15%CaCl
2Or MgF
2Protection under melt and cleaning molten, through the degassing and skim after be cast into alloy pig;
(3) shape: to the peeling of alloy cast ingot crop, be hot extruded into the wire rod of diameter≤φ 10 behind homogenizing annealing, 420～450 ℃ of heating-up temperatures by the multi-pass drawing, contain intermediate annealing, are processed into the continuous plate-like welding wire of certain specification size.
5, the preparation method of alloy welding wire according to claim 4 is characterized in that: during described employing vacuum induction melting, recharge argon pressure after the forvacuum and be not less than 0.7atm.
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Cited By (37)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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