CN103692109A - Low-temperature high-strength welding stick special for Ti-Al-Nb alloy - Google Patents

Low-temperature high-strength welding stick special for Ti-Al-Nb alloy Download PDF

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CN103692109A
CN103692109A CN201310681313.3A CN201310681313A CN103692109A CN 103692109 A CN103692109 A CN 103692109A CN 201310681313 A CN201310681313 A CN 201310681313A CN 103692109 A CN103692109 A CN 103692109A
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welding
titanium aluminium
niobium alloy
temperature
welding wire
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CN103692109B (en
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杜宇
刘伟
洪权
杨海瑛
毛小南
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Northwest Institute for Non Ferrous Metal Research
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Northwest Institute for Non Ferrous Metal Research
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
    • B23K35/325—Ti as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)

Abstract

The invention provides a low-temperature high-strength welding stick special for Ti-Al-Nb alloy. The welding stick is formed by the following component by weight percent: 1.5-1.8% of Al, 10-11.5% of Nb, less than or equal to 0.10% of Fe, less than or equal to 0.05% of Si, less than or equal to 0.08% of C, less than or equal to 0.04% of N, less than or equal to 0.006% of H, less than or equal to 0.12% of O and the balance of Ti. Deposited metal formed by welding the low-temperature high-strength welding stick with the Ti-Al-Nb alloy has excellent plasticity match, has the tensile strength of 1100-1300Mpa, the yield strength not smaller than 950 MPa and the extension ratio not lower than 22% under the condition that the temperature is 77K, and has great promotion value and wide application space, and a welding structure has good comprehensive performances.

Description

A kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire
Technical field
The invention belongs to technical field of welding materials, be specifically related to a kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire.
Background technology
Along with developing rapidly of the industries such as China's space flight, aviation, chemical industry, medicine, have at low temperatures the first-selection that high strength, excellent impact flexibility and anti-notch sensitivity, thermal conductivity are low, become low temperature structure material without the titanium alloy of the features such as magnetic, a kind of important cryogenic engineering material can be used as in the fields such as aerospace, superconduction is used.Engineering material unavoidably need to adopt welding manner to complete the connection of mother metal in structure applications, and welded combination property is a key factor that determines member security reliability simultaneously.And welded performance is welded the impact of the factors such as composition, welding manner and welding procedure, therefore, to the metal material of special component, need to adopt the welding wire of special component to guarantee weldquality and welded reliable.
One-tenth for the titanium aluminium niobium alloy of 77K low temperature environment by following mass percent is grouped into: Al2.0%～3.5%, and Nb12%～16%, surplus is Ti and inevitable impurity.This alloy, mainly for the manufacture of pressure elements, pressure resistant vessel, biological device and corresponding flow guide system and the pipeline etc. of liquid nitrogen in the every profession and trades such as space flight, superconduction, weapons, is the critical material of national defence and civilian production transportation.The Ti-5Al-2.5Sn that titanium aluminium niobium alloy is used as a kind of alternative traditional low temperature, the novel diphasic titanium alloy of Ti-6Al-4V titanium alloy, because having added a large amount of Nb elements, cause its room temperature excellent cold-workability exhibiting, but because using background, it relates to the high-tech areas such as space flight and aviation, relevant report data is less, the special welding wire relating to for this alloy, the at present domestic relevant report that there is not yet.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, and a kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire is provided.The tensile strength of the deposited metal forming after this welding wire and the welding of titanium aluminium niobium alloy under 77K cryogenic conditions is 1100MPa～1300MPa, yield strength is not less than 950MPa, percentage elongation is not less than 22%, this welding wire has good combination property for the Welding Structure obtaining after the welding of titanium aluminium niobium alloy, has promotional value and application space widely.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire, it is characterized in that, and by the one-tenth of following mass percent, be grouped into: Al1.5%～1.8%, Nb10%～11.5%, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti; Described low-temperature high-strength titanium aluminium niobium alloy special welding wire refers to that the deposited metal that forms after the welding of this welding wire and titanium aluminium niobium alloy is that tensile strength under 77K condition is 1100MPa～1300MPa in temperature, yield strength is not less than 950MPa, percentage elongation is not less than 22%, described titanium aluminium niobium alloy is grouped into by the one-tenth of following mass percent: Al2.0%～3.5%, Nb12%～16%, surplus is Ti and inevitable impurity.
Above-mentioned a kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al1.5%, and Nb10%, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.
Above-mentioned a kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al1.8%, and Nb11.8%, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.
Above-mentioned a kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al1.6%, and Nb11%, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.
Above-mentioned a kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al1.6%, and Nb10.5%, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.
The preparation method of titanium aluminium niobium alloy special welding wire of the present invention is:
Step 1, titanium sponge, Al powder and Ti-Nb master alloy particle are evenly mixed by mass percentage, then on hydraulic press, be pressed into block electrode;
Step 2, several piece electrode is adopted to Plasma Welding growth strip, then in vacuum consumable electrode arc furnace, carry out two to three meltings, obtain ingot casting;
The rising head of step 3, excision ingot casting is also rejected the blemish of ingot casting, then under temperature is the condition of 1040 ℃～1210 ℃, ingot casting is carried out to cogging forging;
Step 4, in temperature, be that ingot casting after cogging being forged under the condition of 890 ℃～1010 ℃ carries out flat-die forging on open die forging equipment, obtain thick rod;
Step 5, in temperature, be by the thick excellent hot rolling after forging, to be that specification is the thin rod of Φ 8mm～Φ 12mm under the condition of 890 ℃～960 ℃;
Step 6, adopt polishing or car light mode to remove the defects such as thick excellent surface scale and micro-crack, then under temperature is the condition of 740 ℃～760 ℃, thin rod is carried out to hot pull, obtain a material;
Step 7, silk material is carried out to surperficial mechanical treatment or soda acid is washed processing, then carry out annealing in process, finally obtaining specification is the finished product welding wire of Φ 0.5～Φ 6mm.
Described titanium aluminium niobium alloy can adopt conventional method to prepare: select first as required suitable raw material, press design mix mixing electrode pressing, in conventional vacuum consumable electrode arc furnace, through secondary or three meltings, obtain alloy cast ingot again, then alloy cast ingot stripped off the skin and cut after rising head and tail end, on the flat-die forging equipment such as hydrostatic forging machine, forging hammer, carry out many fire time cogging forgings and upsetting pull and forge, finally obtain titanium aluminium niobium alloy plate.The heating-up temperature that described cogging is forged is 1150 ℃～1250 ℃, and the fire that cogging is forged time deflection is not less than 60%, and the heating-up temperature that upsetting pull is forged is 850 ℃～980 ℃, and the fire that upsetting pull is forged time deflection is not more than 70%.
The present invention compared with prior art has the following advantages:
1, the Welding Structure obtaining after welding wire of the present invention and the welding of titanium aluminium niobium alloy has good combination property, and welding performance is good, and room temperature cold forming performance is excellent, and welding coefficient is greater than 90%.
2, adopting welding wire of the present invention to have excellent strong plasticity with the deposited metal forming after the welding of titanium aluminium niobium alloy mates, its 293K room-temperature mechanical property and 77K cryogenic mechanics performance meet following requirement: the tensile strength Rm>=600MPa under 293K room temperature condition, yield strength Rp 0.2>=500MPa, percentage elongation A 50>=14%, impact flexibility α k u>=45J/cm 2; Tensile strength Rm=1100MPa～1300MPa under 77K cryogenic conditions, yield strength Rp 0.2>=950MPa, percentage elongation A 50>=22%.Proved invention welding wire has good combination property for the Welding Structure obtaining after the welding of titanium aluminium niobium alloy thus.
Below in conjunction with embodiment, the present invention is described in further detail.
The specific embodiment
Embodiment 1
The present embodiment titanium aluminium niobium alloy special welding wire, its chemical composition composition is by mass percentage: Al=1.5%, Nb=10%, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.In the present embodiment, Fe=0.03%, Si≤0.04%, C=0.01%, N=0.01%, H=0.005%, O=0.08%.
The preparation method of the present embodiment titanium aluminium niobium special welding wire is:
Step 1,1 grade of titanium sponge, high-purity Al powder (quality purity is more than 99%) and Ti-40Nb master alloy particle are evenly mixed by mass percentage, then on hydraulic press, be pressed into block electrode;
Step 2, several piece electrode is adopted to Plasma Welding growth strip, then in vacuum consumable electrode arc furnace, carry out two to three meltings, obtain ingot casting;
The rising head of step 3, excision ingot casting is also rejected the blemish of ingot casting, then under temperature is the condition of 1040 ℃, ingot casting is carried out to cogging forging;
Step 4, in temperature, be that ingot casting after cogging being forged under the condition of 890 ℃ carries out flat-die forging on open die forging equipment, obtain thick rod;
Step 5, in temperature, be by the thick excellent hot rolling after forging, to be that specification is the thin rod of Φ 8mm under the condition of 890 ℃;
Step 6, adopt polishing or car light mode to remove the defects such as thick excellent surface scale and micro-crack, then under temperature is the condition of 740 ℃, thin rod is carried out to hot pull, obtain a material;
Step 7, silk material is carried out to surperficial mechanical treatment or soda acid is washed processing, then carry out annealing in process, finally obtaining specification is the finished product welding wire of Φ 0.5.
Select thickness be the titanium aluminium niobium alloy plate of δ 1.5mm as welding base metal, its name chemistry becomes and is by mass percentage: Al3%, Nb15%, surplus is Ti and inevitable impurity.This titanium aluminium niobium alloy plate adopts conventional method to prepare: select first as required suitable raw material, press design mix mixing electrode pressing, in conventional vacuum consumable electrode arc furnace, through secondary or three meltings, obtain alloy cast ingot again, then alloy cast ingot stripped off the skin and cut after rising head and tail end, on the flat-die forging equipment such as hydrostatic forging machine, forging hammer, carry out many fire time cogging forgings and upsetting pull and forge, finally obtain titanium aluminium niobium alloy plate.The heating-up temperature that described cogging is forged is 1200 ℃, and the fire that cogging is forged time deflection is not less than 60%, and the heating-up temperature that upsetting pull is forged is 900 ℃, and the fire that upsetting pull is forged time deflection is not more than 70%.
With plate shearing machine, titanium aluminium niobium alloy plate is cut to the welding rod that specification is 30mm * 20mm * 1.5mm.Before welding, with acetone, welding wire and welding rod are fully soaked, adopt argon arc welding to complete mother metal welding after removal surface and oil contaminant, after welding, the room-temperature property of deposited metal and cryogenic property data are in Table 1.
The mechanical property of table 1 embodiment of the present invention 1 deposited metal under room temperature and cryogenic conditions
Figure BDA0000436533120000051
As shown in Table 1, adopt the 293K room-temperature mechanical property of the deposited metal forming after this welding wire and the welding of titanium aluminium niobium alloy and 77K cryogenic mechanics performance to meet following requirement: the tensile strength Rm>=600MPa under 293K room temperature condition, yield strength Rp 0.2>=500MPa, percentage elongation A 50>=14%, impact flexibility α k u>=45J/cm 2; Tensile strength Rm=1100MPa～1300MPa under 77K cryogenic conditions, yield strength Rp 0.2>=950MPa, percentage elongation A 50>=22%.Hence one can see that, and the present embodiment welding wire has good combination property for the Welding Structure obtaining after the welding of titanium aluminium niobium alloy.
Embodiment 2
The present embodiment titanium aluminium niobium alloy special welding wire, its chemical composition composition is by mass percentage: Al=1.8%, Nb=11.5%, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.In the present embodiment, Fe=0.02%, Si≤0.04%, C=0.01%, N=0.01%, H=0.002%, O=0.09%.
The preparation method of the present embodiment titanium aluminium niobium special welding wire is:
Step 1,0 grade of titanium sponge, high-purity Al powder (quality purity is more than 99%) and Ti-45Nb master alloy particle are evenly mixed by mass percentage, then on hydraulic press, be pressed into block electrode;
Step 2, several piece electrode is adopted to Plasma Welding growth strip, then in vacuum consumable electrode arc furnace, carry out two to three meltings, obtain ingot casting;
The rising head of step 3, excision ingot casting is also rejected the blemish of ingot casting, then under temperature is the condition of 1210 ℃, ingot casting is carried out to cogging forging;
Step 4, in temperature, be that ingot casting after cogging being forged under the condition of 1010 ℃ carries out flat-die forging on open die forging equipment, obtain thick rod;
Step 5, in temperature, be by the thick excellent hot rolling after forging, to be that specification is the thin rod of Φ 12mm under the condition of 960 ℃;
Step 6, adopt polishing or car light mode to remove the defects such as thick excellent surface scale and micro-crack, then under temperature is the condition of 760 ℃, thin rod is carried out to hot pull, obtain a material;
Step 7, silk material is carried out to surperficial mechanical treatment or soda acid is washed processing, then carry out annealing in process, finally obtaining specification is the finished product welding wire of Φ 3mm.
Select thickness be the titanium aluminium niobium alloy plate of δ 3mm as welding base metal, its name chemistry becomes and is by mass percentage: Al3.5%, Nb12%, surplus is Ti and inevitable impurity.This titanium aluminium niobium alloy plate adopts conventional method to prepare: select first as required suitable raw material, press design mix mixing electrode pressing, in conventional vacuum consumable electrode arc furnace, through secondary or three meltings, obtain alloy cast ingot again, then alloy cast ingot stripped off the skin and cut after rising head and tail end, on the flat-die forging equipment such as hydrostatic forging machine, forging hammer, carry out many fire time cogging forgings and upsetting pull and forge, finally obtaining thickness is the titanium aluminium niobium alloy plate of 3mm.The heating-up temperature that described cogging is forged is 1150 ℃, and the fire that cogging is forged time deflection is not less than 60%, and the heating-up temperature that upsetting pull is forged is 980 ℃, and the fire that upsetting pull is forged time deflection is not more than 70%.
With plate shearing machine, titanium aluminium niobium alloy plate is cut to the welding rod that specification is 30mm * 20mm * 3mm.Before welding, with acetone, welding wire and welding rod are fully soaked, adopt argon arc welding to complete mother metal welding after removal surface and oil contaminant, after welding, the room-temperature property of deposited metal and cryogenic property data are in Table 2.
The mechanical property of table 2 embodiment of the present invention 2 deposited metals under room temperature and cryogenic conditions
As shown in Table 2, adopt the 293K room-temperature mechanical property of the deposited metal forming after this welding wire and the welding of titanium aluminium niobium alloy and 77K cryogenic mechanics performance to meet following requirement: the tensile strength Rm>=600MPa under 293K room temperature condition, yield strength Rp 0.2>=500MPa, percentage elongation A 50>=14%, impact flexibility α k u>=45J/cm 2; Tensile strength Rm=1100MPa～1300MPa under 77K cryogenic conditions, yield strength Rp 0.2>=950MPa, percentage elongation A 50>=22%.Hence one can see that, and the present embodiment welding wire has good combination property for the Welding Structure obtaining after the welding of titanium aluminium niobium alloy.
Embodiment 3
The present embodiment titanium aluminium niobium alloy special welding wire, its chemical composition composition is by mass percentage: Al=1.6%, Nb=11%, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.In the present embodiment, Fe=0.01%, Si≤0.04%, C=0.01%, N=0.01%, H=0.006%, O=0.07%.
The preparation method of the present embodiment titanium aluminium niobium special welding wire is:
Step 1,0 grade of titanium sponge, high-purity Al powder (quality purity is more than 99%) and Ti-50Nb master alloy particle are evenly mixed by mass percentage, then on hydraulic press, be pressed into block electrode;
Step 2, several piece electrode is adopted to Plasma Welding growth strip, then in vacuum consumable electrode arc furnace, carry out two to three meltings, obtain ingot casting;
The rising head of step 3, excision ingot casting is also rejected the blemish of ingot casting, then under temperature is the condition of 1180 ℃, ingot casting is carried out to cogging forging;
Step 4, in temperature, be that ingot casting after cogging being forged under the condition of 900 ℃ carries out flat-die forging on open die forging equipment, obtain thick rod;
Step 5, in temperature, be by the thick excellent hot rolling after forging, to be that specification is the thin rod of Φ 10mm under the condition of 920 ℃;
Step 6, adopt polishing or car light mode to remove the defects such as thick excellent surface scale and micro-crack, then under temperature is the condition of 750 ℃, thin rod is carried out to hot pull, obtain a material;
Step 7, silk material is carried out to surperficial mechanical treatment or soda acid is washed processing, then carry out annealing in process, finally obtaining specification is the finished product welding wire of Φ 6mm.
Select thickness be the titanium aluminium niobium alloy plate of δ 20mm as welding base metal, its name chemistry becomes and is by mass percentage: Al2%, Nb16%, surplus is Ti and inevitable impurity.This titanium aluminium niobium alloy plate adopts conventional method to prepare: select first as required suitable raw material, press design mix mixing electrode pressing, in conventional vacuum consumable electrode arc furnace, through secondary or three meltings, obtain alloy cast ingot again, then alloy cast ingot stripped off the skin and cut after rising head and tail end, on the flat-die forging equipment such as hydrostatic forging machine, forging hammer, carry out many fire time cogging forgings and upsetting pull and forge, finally obtaining thickness is the titanium aluminium niobium alloy plate of 20mm.The heating-up temperature that described cogging is forged is 1250 ℃, and the fire that cogging is forged time deflection is not less than 60%, and the heating-up temperature that upsetting pull is forged is 850 ℃, and the fire that upsetting pull is forged time deflection is not more than 70%.
With plate shearing machine, titanium aluminium niobium alloy plate is cut to the welding rod that specification is 150mm * 60mm * 20mm.Before welding, with acetone, welding wire and welding rod are fully soaked, adopt argon arc welding to complete mother metal welding after removal surface and oil contaminant, after welding, the room-temperature property of deposited metal and cryogenic property data are in Table 3.
The mechanical property of table 3 embodiment of the present invention 3 deposited metals under room temperature and cryogenic conditions
Figure BDA0000436533120000081
As shown in Table 3, adopt the 293K room-temperature mechanical property of the deposited metal forming after this welding wire and the welding of titanium aluminium niobium alloy and 77K cryogenic mechanics performance to meet following requirement: the tensile strength Rm>=600MPa under 293K room temperature condition, yield strength Rp 0.2>=500MPa, percentage elongation A 50>=14%, impact flexibility α k u>=45J/cm 2; Tensile strength Rm=1100MPa～1300MPa under 77K cryogenic conditions, yield strength Rp 0.2>=950MPa, percentage elongation A 50>=22%.Hence one can see that, and the present embodiment welding wire has good combination property for the Welding Structure obtaining after the welding of titanium aluminium niobium alloy.
Embodiment 4
The present embodiment titanium aluminium niobium alloy special welding wire, its chemical composition composition is by mass percentage: Al=1.6%, Nb=10.5%, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.In the present embodiment, Fe=0.1%, Si=0.05%, C=0.08%, N=0.04%, H=0.006%, O=0.12%.
The preparation method of the present embodiment titanium aluminium niobium special welding wire is:
Step 1,1 grade of titanium sponge, high-purity Al powder (quality purity is more than 99%) and Ti-55Nb master alloy particle are evenly mixed by mass percentage, then on hydraulic press, be pressed into block electrode;
Step 2, several piece electrode is adopted to Plasma Welding growth strip, then in vacuum consumable electrode arc furnace, carry out two to three meltings, obtain ingot casting;
The rising head of step 3, excision ingot casting is also rejected the blemish of ingot casting, then under temperature is the condition of 1180 ℃, ingot casting is carried out to cogging forging;
Step 4, in temperature, be that ingot casting after cogging being forged under the condition of 900 ℃ carries out flat-die forging on open die forging equipment, obtain thick rod;
Step 5, in temperature, be by the thick excellent hot rolling after forging, to be that specification is the thin rod of Φ 10mm under the condition of 920 ℃;
Step 6, adopt polishing or car light mode to remove the defects such as thick excellent surface scale and micro-crack, then under temperature is the condition of 750 ℃, thin rod is carried out to hot pull, obtain a material;
Step 7, silk material is carried out to surperficial mechanical treatment or soda acid is washed processing, then carry out annealing in process, finally obtaining specification is the finished product welding wire of Φ 6mm.
Select thickness be the titanium aluminium niobium alloy plate of δ 20mm as welding base metal, its name chemistry becomes and is by mass percentage: Al2.5%, Nb15%, surplus is Ti and inevitable impurity.This titanium aluminium niobium alloy plate adopts conventional method to prepare: select first as required suitable raw material, press design mix mixing electrode pressing, in conventional vacuum consumable electrode arc furnace, through secondary or three meltings, obtain alloy cast ingot again, then alloy cast ingot stripped off the skin and cut after rising head and tail end, on the flat-die forging equipment such as hydrostatic forging machine, forging hammer, carry out many fire time cogging forgings and upsetting pull and forge, finally obtaining thickness is the titanium aluminium niobium alloy plate of 20mm.The heating-up temperature that described cogging is forged is 1250 ℃, and the fire that cogging is forged time deflection is not less than 60%, and the heating-up temperature that upsetting pull is forged is 850 ℃, and the fire that upsetting pull is forged time deflection is not more than 70%.
With plate shearing machine, titanium aluminium niobium alloy plate is cut to the welding rod that specification is 150mm * 60mm * 20mm.Before welding, with acetone, welding wire and welding rod are fully soaked, adopt argon arc welding to complete mother metal welding after removal surface and oil contaminant, after welding, the room-temperature property of deposited metal and cryogenic property data are in Table 3.
The mechanical property of table 4 embodiment of the present invention 4 deposited metals under room temperature and cryogenic conditions
Figure BDA0000436533120000101
As shown in Table 4, adopt the 293K room-temperature mechanical property of the deposited metal forming after this welding wire and the welding of titanium aluminium niobium alloy and 77K cryogenic mechanics performance to meet following requirement: the tensile strength Rm>=600MPa under 293K room temperature condition, yield strength Rp 0.2>=500MPa, percentage elongation A 50>=14%, impact flexibility α k u>=45J/cm 2; Tensile strength Rm=1100MPa～1300MPa under 77K cryogenic conditions, yield strength Rp 0.2>=950MPa, percentage elongation A 50>=22%.Hence one can see that, and the present embodiment welding wire has good combination property for the Welding Structure obtaining after the welding of titanium aluminium niobium alloy.
The above, be only preferred embodiment of the present invention, not the present invention imposed any restrictions.Every any simple modification of above embodiment being done according to invention technical spirit, change and equivalence change, and all still belong in the protection domain of technical solution of the present invention.

Claims (5)

1. a low-temperature high-strength titanium aluminium niobium alloy special welding wire, is characterized in that, is grouped into: Al1.5%～1.8%, Nb10%～11.5% by the one-tenth of following mass percent, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti; Described low-temperature high-strength titanium aluminium niobium alloy special welding wire refers to that the deposited metal that forms after the welding of this welding wire and titanium aluminium niobium alloy is that tensile strength under 77K condition is 1100MPa～1300MPa in temperature, yield strength is not less than 950MPa, percentage elongation is not less than 22%, described titanium aluminium niobium alloy is grouped into by the one-tenth of following mass percent: Al2.0%～3.5%, Nb12%～16%, surplus is Ti and inevitable impurity.
2. a kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire according to claim 1, is characterized in that, is grouped into: Al1.5%, Nb10% by the one-tenth of following mass percent, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.
3. a kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire according to claim 1, is characterized in that, is grouped into: Al1.8%, Nb11.5% by the one-tenth of following mass percent, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.
4. a kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire according to claim 1, is characterized in that, is grouped into: Al1.6%, Nb11% by the one-tenth of following mass percent, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.
5. a kind of low-temperature high-strength titanium aluminium niobium alloy special welding wire according to claim 1, is characterized in that, is grouped into: Al1.6%, Nb10.5% by the one-tenth of following mass percent, Fe≤0.10%, Si≤0.05%, C≤0.08%, N≤0.04%, H≤0.006%, O≤0.12%, surplus is Ti.
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US5190602A (en) * 1991-12-17 1993-03-02 The United States Of America As Represented By The Secretary Of Commerce Heterophase titanium aluminides having orthorhombic and omega-type microstructures
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