CN107523718A - A kind of aerospace component 1500MPa level titanium alloys and preparation method thereof - Google Patents
A kind of aerospace component 1500MPa level titanium alloys and preparation method thereof Download PDFInfo
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- CN107523718A CN107523718A CN201710568666.0A CN201710568666A CN107523718A CN 107523718 A CN107523718 A CN 107523718A CN 201710568666 A CN201710568666 A CN 201710568666A CN 107523718 A CN107523718 A CN 107523718A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/04—Refining by applying a vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
Abstract
A kind of preparation method of aerospace component 1500MPa grade super strength titanium alloys, it is made up of according to percentage by weight following element：Al：4.0%~8.0%, Mo：2.0%~6.0%, Sn：0.5%~4%, Zr：2%~6%, Cr：0.50%~4%, Fe：0.5%~3.0%, Nb：0.5%~3.0%, O≤0.30%, surplus are Ti and inevitable impurity, and impurity element total amount is no more than 0.30%, and above weight percentages of components sum is 100%.The invention also discloses the preparation method of the ingot casting of above-mentioned titanium alloy and bar.The superhigh intensity titanium alloy composition of the present invention is uniform, successfully breaches industrial tonne ingot chemistry uniformity controlling technology, reduces scaling loss of the aluminium element in fusion process, avoids high-melting-point molybdenum, chromium, niobium element and forms the metallurgical imperfections such as niggerhead.The Study on Preparation that the present invention passes through bar forging, obtain even tissue, tensile strength is more than 1500MPa, elongation percentage is more than 5%, the technology of preparing of Φ 80~Φ 350mm aerospace component titanium alloy rod bar of the contraction percentage of area more than 15%, provide material with titanium alloy for superhigh intensity aerospace component and ensure.
Description
Technical field
The invention belongs to titanic alloy machining technical field, and in particular to a kind of aerospace component 1500MPa level titanium alloys
And preparation method thereof.
Background technology
With the development of Aeronautics and Astronautics technology, general tensile strength be 1000MPa~1200MPa alpha+beta titanium alloys not
The requirement of airplane design can be met, for the titanium alloy material of 1300MPa levels, such as β -21s, β-C β or near β type titanium alloys, its
The actual pulling force that destroys is 1300MPa~1400MPa, for military service intensity in more than 1500MPa many parts, is still being used
Steel alloy.Therefore, develop a kind of tensile strength and reach more than 1500MPa, and the superhigh intensity titanium alloy with certain plasticity, it is right
The development of China's Aeronautics and Astronautics cause has great progradation.
WSTi1500 titanium alloy names composition is Ti-6Al-4Mo-2Sn-4Zr-2Cr-1Fe-1Nb, and the alloy is taken into account
Creep resisting ability and Ti-10-2-3 alloys is strong under the intensity and toughness of Ti-662-Zr alloys, the moderate temperature of Ti-17 alloys
Degree and heat treatment sensitiveness, based on Ti-662-Zr alloying components, with molybdenum for vanadium, and add the height that chromium and iron design
By force, high-ductility alloy.WSTi1500 titanium alloys belong to the easily segregation element total amount of adding such as the beta-titanium alloy of meta-stable, Mo, Cr and Fe
20wt%, the addition of a large amount of beta stable elements, composition uniformity control difficulty was both added, it is low to reduce alloy phase change point again, increases
Big resistance of deformation, adds forging process deformation uniformity control difficulty.Therefore, composition uniformity control technology and bar group
It is technological difficulties and key technology prepared by WSTi1500 titanium alloys to knit uniformity controlling technology.
The content of the invention
It is an object of the invention to provide a kind of aerospace component 1500MPa level titanium alloys, solve WSTi1500 alloys
In easily segregation element molybdenum, chromium, iron and high-melting-point molybdenum, niobium homogeneity of ingredients control problem.
A kind of system it is a further object of the present invention to provide aerospace component with 1500MPa level titanium alloys and preparation method thereof
Preparation Method.
To reach above-mentioned purpose, aerospace component of the invention 1500MPa level titanium alloys, according to percentage by weight have with
Lower element composition：Al：4.0%~8.0%, Mo：2.0%~6.0%, Sn：0.5%~4%, Zr：2%~6%, Cr：
0.50%~4%, Fe：0.5%~3.0%, Nb：0.5%~3.0%, O≤0.30%, surplus be Ti and inevitably it is miscellaneous
Matter, impurity element are less than the 0.30% of gross weight, and above weight percentages of components sum is 100%.
Described Al, Mo, Sn, Cr, Fe, Nb element derives from intermediate alloy, and wherein Mo elements are added using AlMo alloys
Enter, Sn elements are added using TiSn alloy forms, and Cr elements are added with AlCr alloys, and Fe elements are added with AlFe alloys, Nb members
Element is added using Nb47Ti alloys, and Zr is added with sponge zirconium, and Ti uses 2~12.7mm participated sponge titanium.
Al, Mo, Sn, Zr, Cr, Fe, Nb element of the present invention derives from binary intermediate alloy, reduces Mo, Cr, Nb, Fe
Deng the segregation risk of high-melting-point alloy.
Aerospace component of the present invention is comprised the following steps with the preparation method of 1500MPa level titanium alloys and preparation method thereof：
Step 1：Prepare electrode：
By granular AlMo alloys, TiSn alloys, AlCr alloys, AlFe alloys, Nb47Ti alloys, sponge zirconium and granularity
Single-piece electrode batch mixing is carried out for 2~12.7mm titanium sponge, and is pressed into electrode block；
Step 2：Weld consutrode：
The electrode block obtained with clamp step 1, electrode block is welded as using non-tungsten electrode argon gas protection plasma case
Consutrode；
Step 3：Vacuum melting three times is carried out to consutrode using vacuum consumable electrode arc furnace, that is, obtains WSTi1500 titaniums
Alloy cast ingot；
Step 4：WSTi1500 titan alloy casting ingots are heated to 930~1200 DEG C and carry out 3~5 fire time upsetting pull forgings, upsetting pull
1.60~1.80, insulation is come out of the stove after 120~720 minutes for forging ratio control, and a point hammer is at the uniform velocity depressed, and fully crushes thick as cast condition group
Knit, in ΤβΤ is heated to below transformation temperatureβ- (20~60) DEG C, carry out 2~5 fire time pullings, the deformation using flat and diagonally pulled out
Mode, forging ratio control air cooling after 1.30-1.60, forging make the nodularization of high power Wei Shi bodies historrhexis, and low power turns into uniform fuzzy
Crystalline substance obtains the high strength titanium alloy large scale rod bar of even tissue.
The electrode block of the step 1 is pressed into square electrode using large hydraulic press.
The electric current of step 2 electrode block welding is 220~500A, and weldingvoltage is 30~90V.
The first time vacuum melting parameter of vacuum melting three times in the step 3 is：Crucible specification 160~440mm of Φ,
Molten initial vacuum degree≤8.0Pa, leak rate≤1.5Pa/min, melting 20~35V of voltage, melting 5.0~20kA of electric current, stabilising arc electricity
Flow 3.0~15.0A of direct current, 4~8h of cool time.
Second of vacuum melting parameter of the vacuum melting three times in the step 3 be：：260~Φ of crucible specification Φ
520mm, molten initial vacuum degree≤6.0Pa, leak rate≤1.2Pa/min, melting 22~40V of voltage, melting 8~25kA of electric current, surely
Arc current exchanges 3.0~15.0A, 6~10h of cool time.
The first time vacuum melting parameter of vacuum melting three times in the step 3 is：300~Φ of crucible specification Φ
640mm, molten initial vacuum degree≤5.0Pa, leak rate≤0.8Pa/min, melting 22~35V of voltage, melting 5~18kA of electric current, surely
Arc current exchanges 3.0~15.0A, 8~12h of cool time.
The step 4 divides hammer at the uniform velocity to depress, and air cooling or water cooling are carried out to forging after fully crushing thick as-cast structure.
Its tensile strength of prepared high strength titanium alloy is more than 1500MPa, and elongation percentage is more than 5%, and the contraction percentage of area is big
In 15%.
The present invention is using graininess AlMo alloys, TiSn alloys, AlCr alloys, AlFe alloys, Nb47Ti alloys, sponge zirconium
With 2~12.7mm little particle titanium sponges, the strict oxygen content controlled in raw material and other impurity contents.Before electrode compacting
Using single-piece electrode batch mixing, it is sufficiently mixed uniformly；Electrode completes whole electrode welding mistake in non-tungsten electrode vacuum plasma welding box
Journey, avoid the pollution and anodizing of tungsten or other impurities；Melting three times, melting are carried out using vacuum consumable electrode arc furnace
Journey is strictly controlled parameters such as vacuum, leak rates, the whole horizontal and vertical uniformity of ingot casting composition is improved,
Impurity content reduces.Industrial 1 ton, 2 tons and 5 tonnes ingot chemistry uniformity controlling technology is successfully breached, controls aluminium
Scaling loss of the element in fusion process, the metallurgical imperfections such as high-melting-point niobium element niggerhead are avoided, it is inclined effectively to solve composition
The problems such as content of analysis, impurity and interstitial element controls, lot stability, suitable for Φ 280~Φ 640mm specifications WSTi1500
The industrialized production of titan alloy casting ingot.
By the reasonable setting more than phase transformation with the following mode of texturing of transformation temperature and deformation temperature, structural homogenity is obtained
The excellent aerospace component titanium alloy rod bar of energy.Bar preparation process by it is more than transformation temperature using more fire time high temperature forgings,
Abundant refined cast structure, isometric uniform β crystal grain is obtained, is used below transformation temperature and is diagonally pulled out, pulls out the deformation of the multimodes such as flat,
Strict control forging ratio, even tissue, high-strength high-plastic WSTi1500 titanium alloys 80~Φ of Φ 350mm knots of good performance is prepared
Component titanium alloy rod bar.
Brief description of the drawings
Fig. 1 is 5 points of the ingot casting longitudinal direction sampling schematic diagram to being obtained using the inventive method；
Fig. 2 is that the ingot casting longitudinal direction 5 that the embodiment of the present invention 3 obtains is revealed and studies component；
Fig. 3 is that the ingot casting longitudinal direction 3 that the embodiment of the present invention 1 obtains is revealed and studies component；
Fig. 4 is the bar macrostructure photo that the embodiment of the present invention 3 obtains；
Fig. 5 is the bar microstructure picture that the embodiment of the present invention 3 obtains；
Fig. 6 is the bar macrostructure photo that the embodiment of the present invention 1 obtains；
Fig. 7 is the bar microstructure picture that the embodiment of the present invention 1 obtains；
In figure, I, ingot castings, II, is along longitudinal sample point.
Table 1 is 5 chemical component tables in ingot casting longitudinal direction that the embodiment of the present invention 3 obtains；
Table 2 is 3 chemical component tables in ingot casting longitudinal direction that the embodiment of the present invention 1 obtains；
Table 3 is the performance test result that the embodiment of the present invention 3 obtains；
Table 4 is the performance test result that the embodiment of the present invention 1 obtains；
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
Embodiment 1：
It is according to each element percentage by weight：Al：6.8%, Mo：5.2%, Sn：3.0%, Zr：5.1%, Cr：3.3%,
Fe：2.0%, Nb：2.0%, O≤0.30%, surplus are Ti and inevitable impurity, and impurity element is less than gross weight
0.30%, above weight percentages of components sum is 100%.Take granular AlMo alloys, TiSn alloys, AlCr alloys,
AlFe alloys, Nb47Ti alloys, sponge zirconium carries out single-piece electrode batch mixing with the titanium sponge that granularity is 2~12.7mm, and is pressed into
Electrode block；
Step 2：Weld consutrode：
The electrode block obtained with clamp step 1, electrode block is welded as using non-tungsten electrode argon gas protection plasma case
Consutrode, 220A, weldingvoltage 30V, solder joint requirement is silver gray or faint yellow, prevents solder joint oxidation and high density to be mingled with
Deng metallurgical imperfection；
Step 3：Vacuum melting three times is carried out to consutrode using vacuum consumable electrode arc furnace, that is, obtains Φ's 300
WSTi1500 titan alloy casting ingots；
Step 4, more than transformation temperature forge：Using 1170 DEG C of coggings, fully broken as-cast structure, then pass through 1100 respectively
DEG C, the high temperature forgings such as 1000 DEG C, insulation 120~540 minutes after come out of the stove, a upsetting two is pulled out, forging ratio control 1.60~1.80 it
Between, a point hammer is at the uniform velocity depressed, and fully crushes thick as-cast structure, obtains 2~3mm isometric β crystal grain.
Forged below transformation temperature：Τ is heated to below transformation temperatureβ- 30 DEG C of diagonal pullings, Τβ- 35 DEG C are pulled out flat and diagonally pulled out
Long, Τβ- 40 DEG C of flat pullings, heating and thermal insulation 120~540 minutes, forging ratio are controlled between 1.30~1.60, Τβ- 45 DEG C are fallen
Circle, air cooling is used after forging, obtain Φ 80mm scale rod bars.
According to shown in Fig. 1, to the industrial large-sized casting of WSTi1500 titanium alloys that obtained specification in embodiment 1 is Φ 300mm
5 points of longitudinal head, upper, middle and lower, the tail of ingot is sampled and chemical composition detection, and each member in each position of ingot casting is shown by Fig. 3 data
Stability between plain distributed components and batch is preferable；The Φ 300mm specification WSTi1500 titaniums that wherein embodiment 1 obtains close
The 3 chemical composition analysis result such as Fig. 3 (ordinate is element weight percent) in golden ingot casting longitudinal direction, wherein longitudinal direction 3 is revealed and studied
Divide and listed in table 2, Fig. 6 is the bar macrostructure photo that the embodiment of the present invention 1 obtains；Fig. 7 is that the embodiment of the present invention 1 obtains
Bar forging high and low times of macrograph of state, table 4 is the performance test result that the embodiment of the present invention 3 obtains.
3 chemical compositions in the Φ 300mm specification WSTi1500 titan alloy casting ingots of table 2 longitudinal direction
The Φ 80mm scale rod bar normal temperature mechanical properties of table 4
Embodiment 2：
It is according to each element percentage by weight：Al：4.5%, Mo：3.5%, Sn：2.2%, Zr：3.5%, Cr：2.2%,
Fe：1.5%, Nb：0.8%, O≤0.30%, surplus are Ti and inevitable impurity, and impurity element is less than gross weight
0.30%, above weight percentages of components sum is 100%.Take granular AlMo alloys, TiSn alloys, AlCr alloys,
AlFe alloys, Nb47Ti alloys, sponge zirconium carries out single-piece electrode batch mixing with the titanium sponge that granularity is 2~12.7mm, and is pressed into
Electrode block；
Step 2：Weld consutrode：
The electrode block obtained with clamp step 1, electrode block is welded as using non-tungsten electrode argon gas protection plasma case
Consutrode, 300A, weldingvoltage 50V, solder joint requirement is silver gray or faint yellow, prevents solder joint oxidation and high density to be mingled with
Deng metallurgical imperfection；
Step 3：Vacuum melting three times is carried out to consutrode using vacuum consumable electrode arc furnace, that is, obtains Φ's 440
WSTi1500 titan alloy casting ingots；
Step 4, more than transformation temperature forge：Using 1170 DEG C of coggings, fully broken as-cast structure, then pass through 1100 respectively
DEG C, 1000 DEG C, the high temperature forgings such as 950 DEG C, insulation come out of the stove after 300~540 minutes, and a upsetting two is pulled out, forging ratio control 1.60~
1.80 between, a point hammer is at the uniform velocity depressed, and fully crushes thick as-cast structure, air cooling/water cooling after forging, 2~3mm of acquisition isometric β crystalline substances
Grain.
Forged below transformation temperature：Τ is heated to below transformation temperatureβ- 30 DEG C are diagonally pulled out jumping-up, Τβ- 30 DEG C of diagonal pullings,
Τβ- 35 DEG C pull out flat diagonally pull out, Τβ- 40 DEG C of chamfered edge pullings, forging ratio are controlled between 1.30-1.60, the heating and thermal insulation time
Carry out within 300~540 minutes 1 fire time Τβ- 45 DEG C are fallen circle, and air cooling is used after forging, obtain the air cooling scale rod bars of Φ 160.
Embodiment 3：
It is according to each element percentage by weight：Al:5.3%, Mo：4.2%, Sn：1.9%, Zr：4.1%, Cr：1.9%,
Fe：1.0%, Nb：1.1%, O≤0.30%, surplus are Ti and inevitable impurity, and impurity element is less than gross weight
0.30%, above weight percentages of components sum is 100%.Take granular AlMo alloys, TiSn alloys, AlCr alloys,
AlFe alloys, Nb47Ti alloys, sponge zirconium carries out single-piece electrode batch mixing with the titanium sponge that granularity is 2~12.7mm, and is pressed into
Electrode block；
Step 2：Weld consutrode：
The electrode block obtained with clamp step 1, electrode block is welded as using non-tungsten electrode argon gas protection plasma case
Consutrode, 400A, weldingvoltage 80V, solder joint requirement is silver gray or faint yellow, prevents solder joint oxidation and high density to be mingled with
Deng metallurgical imperfection；
Step 3：Vacuum melting three times is carried out to consutrode using vacuum consumable electrode arc furnace, that is, obtains Φ's 640
WSTi1500 titan alloy casting ingots；
Step 4, more than transformation temperature forge：Pulled out using 1170 DEG C of upsettings two of cogging two, fully broken as-cast structure, then passed through respectively
1100 DEG C, 1000 DEG C, 950 DEG C, the high temperature forgings such as 930 DEG C are crossed, insulation is come out of the stove after 420~720 minutes, and two upsettings two are pulled out, forging ratio control
System between 1.60~1.80, at the uniform velocity depress by a point hammer, fully crushes thick as-cast structure, air cooling/water cooling after forging, obtains 2~3mm
Isometric β crystal grain.
Forged below transformation temperature：Τ is heated to below transformation temperatureβ- 35 DEG C two upsettings two are pulled out, Τβ- 35 DEG C are diagonally pulled out two for upsettings two
Pull out, β -35 DEG C of Τ pulls out the upsetting one of flat one and pulls out chamfered edge, forging ratio is controlled between 1.30~1.60, Τβ- 45 DEG C are fallen circle, are adopted after forging
With air cooling, Φ 350mm scale rod bars are obtained.
According to shown in Fig. 1, being respectively Φ 640mm 5 tons, 1 ton of WSTi1500 titanium alloys to obtained specification in embodiment
5 points of longitudinal head, upper, middle and lower, the tail of the industrial large-sized ingot casting of level is sampled and chemical composition detection, is shown by Fig. 2 data
Stability between each position each element distributed components of ingot casting and batch is preferable；The Φ 640mm that wherein embodiment 3 obtains
The 5 chemical composition analysis result such as Fig. 2 (ordinate is element weight percent) in specification WSTi1500 titan alloy casting ingots longitudinal direction, its
Middle 5 chemical compositions in longitudinal direction are listed in table 1, and Fig. 4 is the bar macrostructure photo that the embodiment of the present invention 3 obtains；Fig. 5 is this
Bar forging high and low times of macrograph of state that inventive embodiments 3 obtain, table 3 is the performance test knot that the embodiment of the present invention 3 obtains
Fruit.
5 chemical compositions in the Φ 640mm specification WSTi1500 titan alloy casting ingots of table 1 longitudinal direction
The Φ 350mm scale rod bar normal temperature mechanical properties of table 3
From test result, the 1500MPa level WSTi1500 titanium alloys produced using the smelting technology technology of the present invention
Ingot casting composition is uniform, suitable for industrialized production.
Embodiment 4：
It is according to each element percentage by weight：Al：4.0%, Mo：6.0%, Sn：4.0%, Zr：6.0%, Cr：0.5%,
Fe：3.0%, Nb：0.5%, O≤0.30%, surplus are Ti and inevitable impurity, and impurity element is less than gross weight
0.30%, above weight percentages of components sum is 100%.Take granular AlMo alloys, TiSn alloys, AlCr alloys,
AlFe alloys, Nb47Ti alloys, sponge zirconium carries out single-piece electrode batch mixing with the titanium sponge that granularity is 2~12.7mm, and is pressed into
Electrode block；
Step 2：Weld consutrode：
The electrode block obtained with clamp step 1, electrode block is welded as using non-tungsten electrode argon gas protection plasma case
Consutrode, 500A, weldingvoltage 90V, solder joint requirement is silver gray or faint yellow, prevents solder joint oxidation and high density to be mingled with
Deng metallurgical imperfection；
Step 3：Vacuum melting three times is carried out to consutrode using vacuum consumable electrode arc furnace, that is, obtains Φ's 550
WSTi1500 titan alloy casting ingots；
Step 4, more than transformation temperature forge：Using 1170 DEG C of coggings, fully broken as-cast structure, then pass through 1100 respectively
DEG C, the high temperature forgings such as 1000 DEG C, insulation 120~540 minutes after come out of the stove, a upsetting two is pulled out, forging ratio control 1.60~1.80 it
Between, a point hammer is at the uniform velocity depressed, and fully crushes thick as-cast structure, obtains 2~3mm isometric β crystal grain.
Forged below transformation temperature：Τ is heated to below transformation temperatureβ- 30 DEG C of diagonal pullings, Τβ- 35 DEG C are pulled out flat and diagonally pulled out
Long, Τβ- 40 DEG C of flat pullings, heating and thermal insulation 120~540 minutes, forging ratio are controlled between 1.30~1.60, Τβ- 45 DEG C are fallen
Circle, air cooling is used after forging, obtain Φ 80mm scale rod bars.
Embodiment 5：
It is according to each element percentage by weight：Al：8.0%, Mo：2.0%, Sn：0.5%, Zr：2.0%, Cr：4.0%,
Fe：0.5%, Nb：3.0%, O≤0.30%, surplus are Ti and inevitable impurity, and impurity element is less than gross weight
0.30%, above weight percentages of components sum is 100%.Take granular AlMo alloys, TiSn alloys, AlCr alloys,
AlFe alloys, Nb47Ti alloys, sponge zirconium carries out single-piece electrode batch mixing with the titanium sponge that granularity is 2~12.7mm, and is pressed into
Electrode block；
Step 2：Weld consutrode：
The electrode block obtained with clamp step 1, electrode block is welded as using non-tungsten electrode argon gas protection plasma case
Consutrode, 350A, weldingvoltage 65V, solder joint requirement is silver gray or faint yellow, prevents solder joint oxidation and high density to be mingled with
Deng metallurgical imperfection；
Step 3：Vacuum melting three times is carried out to consutrode using vacuum consumable electrode arc furnace, that is, obtains Φ's 500
WSTi1500 titan alloy casting ingots；
Step 4, more than transformation temperature forge：Using 1170 DEG C of coggings, fully broken as-cast structure, then pass through 1100 respectively
DEG C, 1000 DEG C, the high temperature forgings such as 950 DEG C, insulation come out of the stove after 300~540 minutes, and a upsetting two is pulled out, forging ratio control 1.60~
Between 1.80, a point hammer is at the uniform velocity depressed, and fully crushes thick as-cast structure, air cooling/water cooling after forging, 2~3mm of acquisition isometric β crystalline substances
Grain.
Forged below transformation temperature：Τ is heated to below transformation temperatureβ- 30 DEG C are diagonally pulled out jumping-up, Τβ- 30 DEG C of diagonal pullings,
Τβ- 35 DEG C pull out flat diagonally pull out, Τβ- 40 DEG C of chamfered edge pullings, forging ratio are controlled between 1.30-1.60, the heating and thermal insulation time
Carry out within 300~540 minutes 1 fire time Τβ- 45 DEG C are fallen circle, and air cooling is used after forging, obtain the air cooling scale rod bars of Φ 160.
Claims (10)
1. a kind of aerospace component 1500MPa level titanium alloys, it is characterised in that have following element group according to percentage by weight
Into：Al：4.0%~8.0%, Mo：2.0%~6.0%, Sn：0.5%~4%, Zr：2%~6%, Cr：0.50%~4%,
Fe：0.5%~3.0%, Nb：0.5%~3.0%, O≤0.30%, surplus are that Ti and inevitable impurity, impurity element are small
In the 0.30% of gross weight, above weight percentages of components sum is 100%.
2. aerospace component according to claim 1 1500MPa level titanium alloys, it is characterised in that described Al, Mo,
Sn, Cr, Fe, Nb element derive from intermediate alloy, and wherein Mo elements are added using AlMo alloys, and Sn elements use TiSn alloy shapes
Formula is added, and Cr elements are added with AlCr alloys, and Fe elements are added with AlFe alloys, and Nb elements are added using Nb47Ti alloys, Zr
Added with sponge zirconium, Ti uses 2~12.7mm participated sponge titanium.
3. a kind of preparation method of aerospace component 1500MPa level titanium alloys as claimed in claim 1 or 2, its feature exist
In comprising the following steps：
Step 1：Prepare electrode：
By granular AlMo alloys, TiSn alloys, AlCr alloys, AlFe alloys, Nb47Ti alloys, sponge zirconium is 2 with granularity
~12.7mm titanium sponge carries out single-piece electrode batch mixing, and is pressed into electrode block；
Step 2：Weld consutrode：
The electrode block obtained with clamp step 1, electrode block is welded as by consumable using non-tungsten electrode argon gas protection plasma case
Electrode；
Step 3：Vacuum melting three times is carried out to consutrode using vacuum consumable electrode arc furnace, that is, obtains WSTi1500 titanium alloy castings
Ingot；
Step 4：WSTi1500 titan alloy casting ingots are heated to 930~1200 DEG C and carry out 3~5 fire time upsetting pull forgings, upsetting pull forging ratio
1.60~1.80, insulation is come out of the stove after 120~720 minutes for control, and a point hammer is at the uniform velocity depressed, and fully crushes thick as-cast structure,
ΤβΤ is heated to below transformation temperatureβ- (20~60) DEG C, carry out 2~5 fire time pullings, the mode of texturing using flat and diagonally pulled out,
Forging ratio control air cooling after 1.30-1.60, forging, makes the nodularization of high power Wei Shi bodies historrhexis, and low power turns into uniformly fuzzy crystalline substance and obtained
Obtain the high strength titanium alloy large scale rod bar of even tissue.
4. the aerospace component according to claim 3 preparation method of 1500MPa level titanium alloys, it is characterised in that institute
The electrode block for stating step 1 is pressed into square electrode using large hydraulic press.
5. the aerospace component according to claim 3 preparation method of 1500MPa level titanium alloys, it is characterised in that step
The electric current of rapid 2 electrode block welding is 220~500A, and weldingvoltage is 30~90V.
6. the aerospace component according to claim 3 preparation method of 1500MPa level titanium alloys, it is characterised in that institute
The first time vacuum melting parameter for stating the vacuum melting three times in step 3 is：Crucible specification 160~440mm of Φ, melt initial vacuum degree
≤ 8.0Pa, leak rate≤1.5Pa/min, melting 20~35V of voltage, melting 5.0~20kA of electric current, stabilising arc current DC 3.0~
15.0A, 4~8h of cool time.
7. the aerospace component according to claim 3 preparation method of 1500MPa level titanium alloys, it is characterised in that institute
Second of vacuum melting parameter for stating the vacuum melting three times in step 3 be：：Crucible specification Φ 260~Φ 520mm are true before melting
Reciprocal of duty cycle≤6.0Pa, leak rate≤1.2Pa/min, melting 22~40V of voltage, melting 8~25kA of electric current, stabilising arc electric current exchange 3.0
~15.0A, 6~10h of cool time.
8. the aerospace component according to claim 3 preparation method of 1500MPa level titanium alloys, it is characterised in that institute
The first time vacuum melting parameter for stating the vacuum melting three times in step 3 is：Crucible specification Φ 300~Φ 640mm, melt initial vacuum
Degree≤5.0Pa, leak rate≤0.8Pa/min, melting 22~35V of voltage, melting 5~18kA of electric current, stabilising arc electric current exchange 3.0~
15.0A, 8~12h of cool time.
9. the aerospace component according to claim 3 preparation method of 1500MPa level titanium alloys, it is characterised in that institute
Stating step 4 divides hammer at the uniform velocity to depress, and air cooling or water cooling are carried out to forging after fully crushing thick as-cast structure.
10. the aerospace component according to claim 3 preparation method of 1500MPa level titanium alloys, it is characterised in that institute
Its tensile strength of the high strength titanium alloy of preparation is more than 1500MPa, and elongation percentage is more than 5%, and the contraction percentage of area is more than 15%.
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| CN108913948A (en) * | 2018-08-03 | 2018-11-30 | 燕山大学 | A kind of high-strength titanium alloy and preparation method thereof |
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| CN110016588A (en) * | 2019-05-14 | 2019-07-16 | 西北工业大学 | A kind of tensile strength is greater than the metastable β Titanium-alloy of 1300MPa |
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