CN106544543A - A kind of titanium alloy with excellent hot-working character and preparation method thereof - Google Patents
A kind of titanium alloy with excellent hot-working character and preparation method thereof Download PDFInfo
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- CN106544543A CN106544543A CN201610936912.9A CN201610936912A CN106544543A CN 106544543 A CN106544543 A CN 106544543A CN 201610936912 A CN201610936912 A CN 201610936912A CN 106544543 A CN106544543 A CN 106544543A
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- titanium alloy
- alloy
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- excellent hot
- working character
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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
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
Abstract
This application discloses a kind of titanium alloy with excellent hot-working character, alloying element of the titanium alloy comprising following weight percentage：Al be 5.8～6.8%, V be 3.8～4.8%, Fe be 0.5～1.5%, balance of titanium and inevitable impurity.Also disclose its preparation method, including alloy pack it is standby；Electrode is suppressed and is welded；Vacuum arc remelting；Cogging is forged；The steps such as flat-die forging.The titanium alloy with excellent hot-working character that the application is provided, by the addition of Fe elements, reduces the lower rheology drag of alloy hot-workability deformation so that the hot-working cost of alloy reduces 15% relative to TC4 alloys.
Description
Technical field
The application is related to a kind of titanium alloy with excellent hot-working character and preparation method thereof, belongs to materials processing technology
Field.
Background technology
TC4 titanium alloys as a kind of most widely used ground alpha+beta diphasic titanium alloy, as which has high specific strength and resistance to by force
The excellent combination properties such as corrosion, have been widely used on the parts such as undercarriage, engine blade and automobile connecting bar.
However, TC4 titanium alloys face rheology drag larger inferior position when plastic deformation is processed at high temperature, so as to cause its hot-workability
Can be poor.
For the situation of titanium alloy hot-working character difference, in prior art, this is solved typically by following several method
Individual problem：(1) add the strong β stabilizing elements β phase excellent to obtain a large amount of hot-working characters, reduce alloy in thermal deformation process
Suffered rheology drag；(2) unit such as a small amount of B or Si is added usually to refine original cast tissue, beneficial to follow-up thermomechanical
Manufacturing procedure；(3) by the operation such as forging or rolling obtaining the room temperature texture of fine uniform, reduce subsequent thermal deformation processing
Occur the phenomenon of strain cracking when preparing parts, so as to further improve its hot-working character, reduce hot-working cost.
Patent No. ZL200810150893.2, provides in the patent of entitled " a kind of low cost high strength titanium alloy "
A kind of low cost high strength titanium alloy, prepares a kind of Ti-Al-V-Fe- by Fe the and Cr elements of addition 1%～3% respectively
Cr alloys, the alloy have higher plasticity in the case where high intensity is ensured, and the hot-workability of the alloy is good, it is easy to
Production.
Application No. 201010241013.X, proposes a kind of titanium in the patent application of entitled " a kind of titanium alfer "
Alfer, wherein the addition of 0.6～2%Fe elements causes the Deformation Resistance of the alloy less than TC4 alloy, Alloy during Superplastic
The wide temperature range of deformation, hot-working character are good.
The content of the invention
According to the one side of the application, there is provided a kind of titanium alloy with excellent hot-working character, the application is provided
The titanium alloy with excellent hot-working character, by the addition of Fe elements, reduce the lower rheology of alloy hot-workability deformation
Drag so that the hot-working cost of alloy reduces 15% relative to TC4 alloys.
A kind of titanium alloy with excellent hot-working character, it is characterised in that the titanium alloy includes following weight percent
The alloying element of content：Al be 5.8～6.8%, V be 3.8～4.8%, Fe be 0.5～1.5%, balance of titanium and inevitable
Impurity.
Preferably, alloying element of the titanium alloy comprising following weight percentage：Al be 6～6.5%, V be 4～
4.5%, Fe are 0.5～1.0%, balance of titanium and inevitable impurity.
Preferably, the inevitable impurity includes：It is that≤0.05%, N is for≤0.05%, H that O is≤0.2%, C
≤ 0.01%, the percentage composition is weight percentage.
According to the another aspect of the application, there is provided a kind of preparation method of the titanium alloy with excellent processing characteristics.
A kind of preparation method of the titanium alloy with excellent processing characteristics, the preparation method comprise the steps：
(1), alloy packs standby：By quantitative aluminium shot, aluminum-vanadium alloy, alfer and TiO2Powder coated is in aluminium foil
In, folding is prepared into alloy bag；
(2), electrode compacting and welding：Titanium sponge and alloy bag are pressed into into the electrode block of densification by press, while borrowing
Argon arc welding is helped to obtain welding electrode block；
(3), vacuum arc remelting：In 28～30V of arc voltage, 3～3.6kA of arc current and 10-2It is under the conditions of Pa, right
Welding electrode block obtained by step (2) carries out secondary smelting, and during each melting, a length of 15～20min, obtains cylindrical ingot；
(4), cogging forging：Cylindrical ingot cogging obtained by step (3) is forged into into cuboid blank；
(5), flat-die forging：The thick slabs of 30mm are processed into in cuboid blank flat-die forging obtained by step (4).
Preferably, the step (4) specifically includes：
(4), cogging forging：Cylindrical ingot obtained by step (3) is warming up to after 1000～1100 DEG C, insulation 1～
1.5h, carries out cogging by 2000T press, most at last cylindrical ingot deformation processing into cuboid blank.
Preferably, the step (5) specifically includes：
(5), flat-die forging：Cuboid blank obtained by step (4) is reheated to into 1000～1050 DEG C, is rushed by 5T
Hammer into shape cuboid blank deformation processing into 30mm thick slab, final forging temperature maintains more than 930 DEG C.
Preferably, before step (4) cogging forging is carried out, also include carrying out the cylindrical ingot it is monolateral strip off the skin 3～
6mm, take at 150～250mm of casting head in the cylindrical ingot composition carry out detect hydrogen-oxygen sample and bits sample
Process.
Preferably, before step (4) cogging forging is carried out, determine shrinkage cavity away from the cylindrical ingot by ultrasound examination
The distance of head, sawing rising head after labelling, while cutting off the position of 10～15mm of ingot butt.
Preferably, in described step (4), the cylindrical ingot deformation extent is 50～70%, is finally pressed into
80mm～90mm thick cuboid base.
Preferably, in described step (5), deflection≤10% of every time flat-die forging is finally forged into 30mm
Thick slab.
The beneficial effect that the application can be produced includes：
The TC4 alloying components of a kind of Fe element dopings that the application is provided, while it is also proposed the corresponding forging of the titanium alloy
Preparation method.By the addition of Fe elements, the lower rheology drag of alloy hot-workability deformation is reduced so that the heat of alloy adds
Work cost reduces 15% relative to TC4 alloys；Cogging takes upsetting pull operation repeatedly when forging so that the thick crystalline substance of original foundry goods
Grain is fully crushed, the fine uniform that finally gives, the lamellar structure without obvious segregation, beneficial to follow-up thermo-mechanical processi with
And the preparation of parts.
For for TC4 alloys, higher rheology drag is faced under high temperature during plastic deformation frequently can lead to which and be processed into
This is too high.In the application, Fe elements are with the addition of in titanium alloy, Fe is used as a kind of cheap β phase stabilizing elements, a certain amount of Fe
The addition of element can cause alloy β phase transition temperatures to be declined, and compare TC4 alloys with more easy under identical deformation temperature
In the β phases of deformation, alloy rheological drag is caused to decline；Fe is dissolved in β phases as interstitial element and can form paired room simultaneously simultaneously
With higher vacancy concentration, so as to improve the diffuser efficiency in β phases, occur dynamic recovery in causing alloy or dynamic is tied again
The time of brilliant behavior can shift to an earlier date, so as to further reduce the flow stress under alloy high-temp plastic deformation.By to base
Material obtains the tissue topography that basket tissue is combined with Widmannstatten structure after carrying out β forging air coolings, forms interrupted tiny lamellar α phase,
So that alloy has good thermo-mechanical processi ability, lose so as to prevent alloy subsequent thermal processing from deformation occur when preparing parts
Effect.
Description of the drawings
Fig. 1 is the metallography microscope of 1000 times of the titanium alloy forging with excellent hot-working character of the embodiment of the present application 1
Figure；
Fig. 2 is for TC4 alloys with the titanium alloy with excellent hot-working character of the embodiment of the present application 1 in identical thermal deformation bar
Stress-strain diagram comparison diagram under part；
Fig. 3 is the macro morphology photo after the Titanium Alloy in Hot with excellent hot-working character of the embodiment of the present application 1；
Fig. 4 shows for the metallographic of 500 times after the Titanium Alloy in Hot with excellent hot-working character of the embodiment of the present application 1
Micro- figure.
Specific embodiment
With reference to embodiment in detail the application is described in detail, but the application is not limited to these embodiments.
If no special instructions, the raw material in embodiments herein is bought by commercial sources.
Embodiment 1
A kind of titanium alloy with excellent hot-working character, is that 6%, V is for 4%, Fe by weight percentage by Al
0.5%th, O be≤0.2%, C be≤0.05%, N be≤0.05%, H be≤0.01%, balance of Ti.By quantitative aluminium shot, aluminum
Vanadium alloy, alfer and TiO2In aluminium foil, folding is prepared into alloy bag to powder coated；Alloy bag is placed in titanium sponge
The electrode block of densification is pressed into by press, welding electrode block is formed by the mode of argon arc welding；Then arc voltage 28～
30V, 3～3.6kA of arc current and vacuum 10-2Under conditions of Pa, secondary vacuum is carried out to above-mentioned welding electrode block and is melted
Refining, a length of 15～20min during each melting obtain the ingot casting that quality is 30kg or so.Before ingot formation forging, ingot casting surface is entered
Monolateral 3～the 6mm that strips off the skin of row, is taking hydrogen-oxygen sample and bits sample, at 150～250mm of casting head for carrying out to ingot casting composition
Detection；Distance of the shrinkage cavity away from casting head, sawing rising head after labelling are determined by ultrasound examination, while cutting off ingot butt 10-
The edge of 15mm or so.When cogging is forged, the final deformation extent of sample is 50～70%, is finally pressed into 80～90mm or so
Thick cuboid base, then polishing remove holiday.During open die forging, every time deflection≤10%, is finally swaged into
30mm or so thick slab.
Embodiment 2
A kind of titanium alloy with excellent hot-working character, by weight percentage：It is that 4.5%, Fe is that Al is 6.5%, V
1.0%th, O be≤0.2%, C be≤0.05%, N be≤0.05%, H be≤0.01%, balance of Ti；By quantitative aluminium shot, aluminum
Vanadium alloy, alfer and TiO2In aluminium foil, folding is prepared into alloy bag to powder coated；Alloy bag is placed in titanium sponge
The electrode block of densification is pressed into by press, welding electrode block is formed by the mode of argon arc welding；Then arc voltage 28～
30V, 3～3.6kA of arc current and vacuum 10-2Under conditions of Pa, secondary vacuum is carried out to above-mentioned welding electrode block and is melted
Refining, a length of 15～20min during each melting obtain the ingot casting that quality is 30kg or so.Before ingot formation forging, ingot casting surface is entered
Monolateral 3～the 6mm that strips off the skin of row, is taking hydrogen-oxygen sample and bits sample, at 150～250mm of casting head for carrying out to ingot casting composition
Detection；Distance of the shrinkage cavity away from casting head, sawing rising head after labelling are determined by ultrasound examination, while it is left to cut off ingot butt 10mm
Right edge.When cogging is forged, the final deformation extent of sample is 50～70%, is finally pressed into the thick length of 80～90mm or so
Cube base, then polishing remove holiday.Every time deflection≤10% during open die forging, is finally swaged into 30mm left
Right thick slab.
Embodiment 3
The present embodiment is related to the microscopic structure detection that the application has the titanium alloy of excellent hot-working character.
The titanium with excellent hot-working character amplified prepared by 1000 times of observation embodiments 1 using metallurgical microscope is closed
Gold, as shown in figure 1, the as-forged microstructure of the titanium alloy is large-area Widmannstatten structure and a little basket group as seen in Figure 1
Knit, uniform tiny lamellar α phase proper alignment is in Original β grain.Wherein β phases account for 20%, are conducive to the high temperature of alloy to become
Shape.
Embodiment 4
The present embodiment be related to the application have excellent hot-working character titanium alloy thermal deformation ess-strain detection.
As shown in figure 1, using identical melting forging technology prepare TC4 alloys and the embodiment of the present application 1 with excellent
The titanium alloy new alloy of hot-working character is in the same terms (850 DEG C of deformation temperature, rate of deformation 1s-1) under thermal deformation stress should
Varied curve is can be seen that compared to TC4 alloys, and the flow stress under the titanium alloy high-temperature deformation of the embodiment of the present application 1 has substantially
Decline.Wherein stress value has 15～25% decline, illustrates the hot-working character of titanium alloy of the embodiment of the present application 1 compared with TC4
Alloy has and largely improves, so as to reduce titanium alloy hot-working cost.
Embodiment 5
The present embodiment be related to the application have excellent hot-working character titanium alloy hot-working character detection.
Deformation temperature, 5s at 950 DEG C-1Strain rate under to prepared by the embodiment of the present application 1 titanium alloy macroscopic view shape
Looks photo is not as shown in figure 3, as can be seen from Figure 3 sample alloy surface after the hot-working of an aximal deformation value occurs
, also there is not deforming the failure phenomenon for subsiding in cracking.Amplify 500 times using metallurgical microscope and observe micro- group of the alloy
Knit, as shown in Figure 4, it is known that the application titanium alloy occurs dynamic recrystallization phenomenon in thermal deformation process, dynamic recrystallization goes out
Rheology drag during thermal deformation can be now significantly reduced, so as to prove that the titanium alloy has excellent hot-working character.
The above, is only several embodiments of the application, any type of restriction is not done to the application, although this Shen
Please disclosed as above with preferred embodiment, but and be not used to limit the application, any those skilled in the art are not taking off
In the range of technical scheme, a little variation is made using the technology contents of the disclosure above or modification is equal to
Effect case study on implementation, belongs in the range of technical scheme.
Claims (10)
1. a kind of titanium alloy with excellent hot-working character, it is characterised in that the titanium alloy contains comprising following weight percent
The alloying element of amount：Al be 5.8～6.8%, V be 3.8～4.8%, Fe be 0.5～1.5%, balance of titanium and inevitably
Impurity.
2. the titanium alloy with excellent hot-working character according to claim 1, it is characterised in that the titanium alloy is included
The alloying element of following weight percentage：Al be 6～6.5%, V be 4～4.5%, Fe be 0.5～1.0%, balance of titanium and
Inevitable impurity.
3. the titanium alloy with excellent hot-working character according to claim 1 and 2, it is characterised in that described to keep away
The impurity exempted from includes：It is that≤0.05%, H is≤0.01% for≤0.05%, N that O is≤0.2%, C, and the percentage composition is attached most importance to
Amount percentage composition.
4. a kind of preparation method of the titanium alloy with excellent processing characteristics as described in claim 1-3 any one, which is special
Levy and be, the preparation method comprises the steps：
(1), alloy packs standby：By quantitative aluminium shot, aluminum-vanadium alloy, alfer and TiO2Powder coated is folded in aluminium foil
It is prepared into alloy bag；
(2), electrode compacting and welding：Titanium sponge and alloy bag are pressed into into the electrode block of densification by press, while by argon
Arc welding obtains welding electrode block；
(3), vacuum arc remelting：In 28～30V of arc voltage, 3～3.6kA of arc current and 10-2Under the conditions of Pa, to step
(2) the welding electrode block obtained by carries out secondary smelting, and during each melting, a length of 15～20min, obtains cylindrical ingot；
(4), cogging forging：Cylindrical ingot cogging obtained by step (3) is forged into into cuboid blank；
(5), flat-die forging：The thick slabs of 30mm are processed into in cuboid blank flat-die forging obtained by step (4).
5. the preparation method of the titanium alloy with excellent hot-working character according to claim 4, it is characterised in that described
Step (4) is specifically included：
(4), cogging forging：Cylindrical ingot obtained by step (3) is warming up to after 1000～1100 DEG C, 1～1.5h is incubated, is led to
Crossing 2000T press carries out cogging, most at last cylindrical ingot deformation processing into cuboid blank.
6. the preparation method of the titanium alloy with excellent hot-working character according to claim 4, it is characterised in that described
Step (5) is specifically included：
(5), flat-die forging：Cuboid blank obtained by step (4) is reheated to into 1000～1050 DEG C, will by 5T block stamps
Cuboid blank deformation processing maintains more than 930 DEG C into 30mm thick slab, final forging temperature.
7. the preparation method of the titanium alloy with excellent hot-working character according to claim 4, it is characterised in that entering
Before row step (4) cogging forging, also include carrying out the cylindrical ingot the monolateral 3～6mm that strips off the skin, apart from casting head
Take at 150～250mm in the process that detection hydrogen-oxygen sample and bits sample are carried out to the cylindrical ingot composition.
8. the preparation method of the titanium alloy with excellent hot-working character according to claim 4, it is characterised in that entering
Before row step (4) cogging forging, distance of the shrinkage cavity away from the cylindrical ingot head is determined by ultrasound examination, sawed after labelling
Rising head is cut, while cutting off the position of 10～15mm of ingot butt.
9. the preparation method of the titanium alloy with excellent hot-working character according to claim 4, it is characterised in that in institute
In the step of stating (4), the cylindrical ingot deformation extent is 50～70%, is finally pressed into the thick cuboids of 80mm～90mm
Base.
10. the preparation method of a kind of titanium alloy with excellent hot-working character according to claim 4, its feature exist
In, in described step (5), deflection≤10% of every time flat-die forging is finally forged into the thick slabs of 30mm.
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Cited By (1)
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| CN114262779A (en) * | 2021-12-30 | 2022-04-01 | 西北有色金属研究院 | Processing method of ultralow-clearance medium-strength high-toughness titanium alloy thick plate |
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