CN109022911A - A kind of high-ductility titanium alloy and preparation method thereof - Google Patents
A kind of high-ductility titanium alloy and preparation method thereof Download PDFInfo
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- CN109022911A CN109022911A CN201811131221.7A CN201811131221A CN109022911A CN 109022911 A CN109022911 A CN 109022911A CN 201811131221 A CN201811131221 A CN 201811131221A CN 109022911 A CN109022911 A CN 109022911A
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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
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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
The invention belongs to titanium alloy technical field, a kind of high-ductility titanium alloy and preparation method thereof is provided, the high-ductility titanium alloy, based on mass content, Ti and inevitable impurity including Al 3%, V 10%, Fe 2%, Hf0.35~3.0% and surplus.The content of strict control each element of the present invention, the plastic property of titanium alloy is promoted by alloying action, the experimental results showed that, the yield strength for the titanium alloy that the present invention obtains is maintained at 600MPa or so, on the basis of decline is within the scope of 100Mpa, elongation percentage reaches 52.81%.It is the 277.94%~880.16% of the existing Ti-10V-2Fe-3Al elongation percentage of equality strength, is 460.01% of Ti-10V-2Fe-3Al (identical method of smelting and rolling mill practice, elongation percentage 11.48%) elongation percentage under the conditions of.
Description
Technical field
The present invention relates to titanium alloy technical field, in particular to a kind of high-ductility titanium alloy and preparation method thereof.
Background technique
Titanium alloy is because of its specific strength height, and corrosion resistance is strong, and welding performance is good, and linear expansion coefficient is small, good biofacies
The advantages that capacitive, it is widely used in aerospace, ship weapon, bio-medical, the fields such as sports goods, with further grinding
Study carefully, titanium alloy there will be broader practice prospect.
Metastableβtitaniumalloy has extraordinary process plastic and cold formability, and TB6 (Ti-10V-2Fe-3Al) is wherein
Typical Representative.The alloy be used to manufacture the forging zero in airframe, wing and undercarriage because of its excellent toughness and tenacity
Part, such as the shaft bearing shell of 757 aircraft of Boeing.Fe in TB6 containing 2% holds since Fe is as a kind of normal segregation element
Easily lead to that ingredient in TB6 titanium alloy is inhomogenous, this ingredient is unevenly referred to as β spot, causes the Alloy At Room Temperature plastic property
Decline, restrict its application.
Currently, being directed to TB6 alloy, the mode that its plasticity is turned up is mainly by reasonable heat treatment process or to pass through melting
In the process by the use of intermediate alloy, the Fe segregation in ingot casting is reduced, and then weaken the influence to plasticity.It common are and help
The heat treatment process for improving TB6 alloy plasticity is complicated；The use of intermediate alloy in fusion process improves production cost, is unfavorable for
Application.Also, the elongation percentage of current Ti-10V-2Fe-3Al alloy only rises to 6~19%.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of high-ductility titanium alloys and preparation method thereof.The present invention provides
Titanium alloy under the premise of keeping suitable intensity, significantly improve the plasticity of titanium alloy.
In order to solve the above technical problems, the present invention provides following technical schemes:
The present invention provides a kind of high-ductility titanium alloys, based on mass content, including Al 3%, V 10%, Fe 2%,
The Ti and inevitable impurity of Hf0.35~3.0% and surplus.
Preferably, based on mass content, the inevitable impurity be C≤0.1%, N≤0.03%, H≤
0.015%, O≤0.15%.
Preferably, the high-ductility titanium alloy include the Ti of Al 3%, V 10%, Fe 2%, Hf 0.75% and surplus with
And inevitable impurity.
The present invention also provides the preparation methods of the high-ductility titanium alloy described in above-mentioned technical proposal, comprising the following steps:
(1) cast alloy base will be obtained after the alloy raw material melting of corresponding alloying component；
(2) it is deformed after the cast alloy base that the step (1) obtains being carried out isothermal holding, obtains high-ductility titanium alloy.
Preferably, melting is vacuum arc melting in the step (1), the temperature of the vacuum arc melting is 2000~
2900℃。
Preferably, melting number is at 5 times or more in the step (1), and each smelting time is in 1min or more.
Preferably, the temperature of isothermal holding is 780~820 DEG C in the step (2), time of isothermal holding is 40~
50min。
Preferably, rolling deformation is deformed into the step (2)；The total deformation of the rolling deformation is 70~75%.
Preferably, the rolling deformation is multi- pass rolling；
When using multi- pass rolling, after rolling per pass, alloy preform after rolling keeps the temperature to 5 at 780~820 DEG C~
7min。
Preferably, the high-ductility titanium alloy include the Ti of Al 3%, V 10%, Fe 2%, Hf 0.75% and surplus with
And inevitable impurity.
The present invention provides a kind of high-ductility titanium alloys, based on mass content, including Al 3%, V 10%, Fe 2%,
The Ti and inevitable impurity of Hf0.35~3.0% and surplus.
The content of strict control each element of the present invention promotes the plastic property of titanium alloy, experiment knot by alloying action
Fruit shows that the yield strength for the titanium alloy that the present invention obtains is maintained at 600MPa or so, declines the basis within the scope of 100Mpa
On, elongation percentage reaches 52.81%.For the existing Ti-10V-2Fe-3Al elongation percentage of equality strength 277.94%~
880.16%, for Ti-10V-2Fe-3Al (identical method of smelting and rolling mill practice, the elongation percentage 11.48%) extension under the conditions of
The 460.01% of rate.
The preparation method of titanium alloy provided by the invention is simple, without carrying out complicated heat treatment process, will directly correspond to
After the raw material melting of alloying component, isothermal holding improves the uniformity of ingredient after melting, obtains in conjunction with deformation process high-plastic
Property titanium alloy.
Detailed description of the invention
Fig. 1 is tensile property of the present invention test tensile sample dimensional drawing；
Fig. 2 is the tensile stress strain curve of titanium alloy made from different embodiments；
Fig. 3 is the stretching fracture metallographic optical microscopy map of titanium alloy made from embodiment 1；
Fig. 4 is the shape appearance figure of stretching fracture made from embodiment 1.
Specific embodiment
The present invention provides a kind of high-ductility titanium alloys, based on mass content, including Al 3%, V 10%, Fe 2%,
The Ti and inevitable impurity of Hf0.35~3.0% and surplus.
Based on mass content, inevitable impurity is preferably C≤0.1%, N in high-ductility titanium alloy provided by the invention
≤ 0.03%, H≤0.015%, O≤0.15%.
Based on mass content, high-ductility titanium alloy provided by the invention includes Al 3%, V 10%, Fe 2%, Hf0.35
~3.0% and surplus Ti and inevitable impurity, further preferably Al 3%, V 10%, Fe 2%, Hf0.75~
3.0% and surplus Ti and inevitable impurity, more preferably Al 3%, V 10%, Fe 2%, Hf 1.0~3.0%
With the Ti and inevitable impurity of surplus.
The present invention adds proper ratio neutral element, changes the induction of stress induced martensite by the method for alloying
Stress forms a certain proportion of stress-induced martensite during stretching, cuts crystal grain refinement tissue；Due to inducing stress
Plasticity improves in difference, energy conversion in transition process, softening tissue.
The present invention also provides the preparation methods of the high-ductility titanium alloy described in above-mentioned technical proposal, comprising the following steps:
(1) cast alloy base will be obtained after the alloy raw material melting of corresponding alloying component；
(2) it is deformed after the cast alloy base that the step (1) obtains being carried out isothermal holding, obtains high-ductility titanium alloy.
The present invention will obtain cast alloy base after the alloy raw material melting of corresponding alloying component.The present invention is former to the alloy
The type of material does not have special restriction, uses alloy raw material well known to those skilled in the art can obtain the conjunction of the titanium of target components
Subject to gold.In the present invention, the alloy raw material preferably includes titanium silk, aluminium wire, pure iron, pure vanadium and pure hafnium, without valuableness
Intermediate alloy.The present invention does not have special restriction to the ratio of various alloy raw materials, and final alloying component satisfaction can be made to want
It asks.
In the present invention, the melting is preferably vacuum arc melting, and the temperature of the vacuum arc melting is preferably
2000~2900 DEG C, more preferably 2200~2400 DEG C, most preferably 2250~2300 DEG C.In the present invention, the vacuum electric
The vacuum degree of arc melting is preferably 0.04~0.05MPa, is carried out under the conditions of argon gas.When using vacuum arc melting, this hair
It is bright that vacuum degree in furnace chamber is first preferably evacuated to 2 × 10-3Pa hereinafter, be passed through argon gas again；The intake of the argon gas is to meet
The amount of electric arc melting ionized gas.In the present invention, the voltage of the vacuum arc melting is preferably 20V.The present invention
There is no particular/special requirement to the specific embodiment of the vacuum arc melting, using well-known to those skilled in the art.
The present invention using first vacuumize be passed through argon gas again by the way of can be avoided alloy raw material first in the event of high temperatures, largely inhale hydrogen
Nitrogen is inhaled in oxygen uptake, is aoxidized, moreover it is possible to provide ionized gas for electric arc melting.In the present invention, the number of the melting is preferably 8
More than secondary, further preferably 8~10 times, cast alloy base is obtained after melting；The time of each melting preferably in 3min or more,
Further preferably 3~5min, more preferably 4min.In the present invention, when melting is repeated, the melting is preferably true
It is carried out in empty arc-melting furnace；It is specific: raw metal being subjected to melting in arc-melting furnace, obtains melting liquid；It is then cold
But slab is obtained, then carries out melting after overturning slab, obtains melting liquid again, melting liquid is cooled down again, obtains slab, it is anti-with this
It is 8 times or more multiple, it is ensured that obtained as cast condition base ingredient is uniform.
The present invention enables to as cast condition base ingredient uniform in the fusion process, effectively eliminates stomata and defect.
Before the melting, the alloy raw material is preferably cleaned by ultrasonic by the present invention；The present invention is to the ultrasonic cleaning
Specific embodiment there is no particular/special requirement, using well-known to those skilled in the art.
After obtaining cast alloy base, the present invention deforms after the cast alloy base is carried out isothermal holding, obtains high-ductility
Titanium alloy.The present invention carries out deformation process after cast alloy base is first carried out isothermal holding again, so that titanium alloy in deformation process
Ingot is able to maintain higher temperature, realizes thermal deformation.The present invention can eliminate casting flaw, dense organization, refinement using thermal deformation
Alloy Original β grain.
In the present invention, the temperature of the isothermal holding is preferably 780~820 DEG C, and further preferably 800 DEG C.At this
In invention, the soaking time of the isothermal holding is preferably 40~50min, further preferably 42~45min.
After the isothermal holding, the present invention deforms titanium alloy ingot after the heat preservation, obtains high-ductility titanium alloy.?
In the present invention, the deformation is preferably rolling deformation, and the total deformation of the rolling deformation is preferably 70~75%, further excellent
It is selected as 72~73%；The temperature of the rolling deformation is preferably 780~820 DEG C, and further preferably 800 DEG C, with isothermal holding
Temperature in the process is consistent.In the present invention, the deformation process makes crystal grain refinement, and generates a large amount of dislocations, has
Help improve alloy obdurability.
In the present invention, the rolling deformation is more preferably multi- pass rolling, and deflection per pass is preferably 1~
2mm, further preferably 1.2~1.4mm；The present invention does not have particular/special requirement to the rolling number of the multi- pass rolling, with energy
Complete target distortion amount.When the present invention carries out multi- pass rolling, every time after rolling, the present invention will preferably close after the rolling
Golden base rolling deformation at a temperature of keep the temperature 5~7min, further preferably 6~7min.The present invention is to the rolling deformation
Specific embodiment does not have particular/special requirement, using well-known to those skilled in the art.
After completing deformation, the present invention preferably by obtained deforming alloy water cooling to room temperature, obtains high-ductility titanium alloy.This hair
The bright specific embodiment to the water cooling to room temperature does not have particular/special requirement, using embodiment party well-known to those skilled in the art
Formula.
In order to further illustrate the present invention, below with reference to embodiment to high-ductility titanium alloy provided by the invention and its preparation
Method is described in detail, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
Alloying component by mass percentage: V 10%, Fe 2%, Al 3%, Hf0.75%, surplus are Ti (Ti-10V-
2Fe-3Al-0.75Hf) ingredient weighs the Ti silk that 66.73g purity is 99.9%, the Al silk that 2.37g purity is 99.5%,
High-purity Fe that 1.58g purity is 99.99%, high-purity V that 7.92g purity is 99.9%, the Hf silk that 0.59g purity is 99.99%
Feed proportioning, with non-consumable arc furnace melting.Raw material is dipped in dehydrated alcohol and carries out ultrasonic cleaning, ultrasonic cleaning
After air-dry, be placed in non-consumable vacuum arc melting furnace water jacketed copper crucible in, the vacuum degree in furnace chamber will be extracted into 2 × 10-3Pa with
Under, Arc Welding Power operating current is 400A, operating voltage 20V, and high-purity argon gas is filled with before electric arc melting as protection gas (vacuum
Degree is in 0.04~0.05MPa) after, arc temperature is about 2500 DEG C or so when each melting, and each smelting time is about 3 minutes
Left and right, it is cooling after each melting to obtain ingot casting, then overturning processing is carried out to ingot casting and carries out melting, with this melting-casting casting
Ingot melt back and overturning ingot casting 8 times are to guarantee that the ingot casting ingredient finally obtained is uniform.
It is finished to alloy melting, keeps the temperature 40 minutes for 800 DEG C in heat-treatment furnace, carry out 11 passages in 200 type duo mills
Rolling, each volume under pressure are to put back to alloy in furnace between 1.35mm twice time to keep the temperature 5 minutes, and the initial average height of ingot casting is
18.0mm has finally rolled with a thickness of 5.0mm, and maximum rolling reduction reaches 70%, and alloy is cooled to room temperature with water quenching method, system
Obtain super-high-plasticity titanium alloy.
Embodiment 2
High-ductility titanium alloy is prepared in the way of embodiment 1, difference is:
According to the weight percent of the chemical component of titanium alloy are as follows: V 10%, Fe 2%, Al 3%, Hf0.35%, surplus
For Ti (Ti-10V-2Fe-3Al-0.35Hf), raw material is weighed, Ti silk that 68.66g purity is 99.9%, 2.43g purity are
99.5% Al silk, high-purity Fe that 1.62g purity is 99.99%, high-purity V that 8.11g purity is 99.9%, 0.28g purity are
99.99% Hf silk.
In 800 DEG C of heat preservation 45min before rolling deformation, each volume under pressure is 1.25mm, melts down guarantor per between rolling deformation twice
Warm 6min, the initial average height of ingot casting are 18.5mm, have finally been rolled with a thickness of 4.8mm, maximum rolling reduction reaches 74%.
Embodiment 3
High-ductility titanium alloy is prepared in the way of embodiment 1, difference is:
According to the weight percent of the chemical component of titanium alloy are as follows: V 10%, Fe 2%, Al 3%, Hf1%, surplus are
Ti (Ti-10V-2Fe-3Al-1Hf) weighs raw material, and Ti silk that 68.38g purity is 99.9%, 2.44g purity are 99.5%
Al, high-purity Fe that 1.62g purity is 99.99%, high-purity V that 8.14g purity is 99.9%, 0.81g purity is 99.99%
Hf。
In 800 DEG C of heat preservation 45min before rolling deformation, each volume under pressure is 1.20mm, melts down guarantor per between rolling deformation twice
Warm 6min, the initial average height of ingot casting are 19.0mm, have finally been rolled with a thickness of 4.7mm, maximum rolling reduction reaches 73%.
Embodiment 4
High-ductility titanium alloy is prepared in the way of embodiment 1, difference is:
According to the weight percent of the chemical component of titanium alloy are as follows: V 10%, Fe 2%, Al 3%, Hf2%, surplus are
Ti (Ti-10V-2Fe-3Al-2Hf) weighs raw material, and Ti silk that 63.02g purity is 99.9%, 2.27g purity are 99.5%
Al, high-purity Fe that 1.51g purity is 99.99%, high-purity V that 7.59g purity is 99.9%, 1.51g purity is 99.99%
Hf。
In 800 DEG C of heat preservation 50min before rolling deformation, each volume under pressure is 1.40mm, melts down guarantor per between rolling deformation twice
Warm 7min, the initial average height of ingot casting are 19.5mm, have finally been rolled with a thickness of 4.5mm, maximum rolling reduction reaches 75%.
Embodiment 5
High-ductility titanium alloy is prepared in the way of embodiment 1, difference is:
According to the weight percent of the chemical component of titanium alloy are as follows: V 10%, Fe 2%, Al 3%, Hf3%, surplus are
Ti (Ti-10V-2Fe-3Al-3Hf) weighs raw material, and Ti silk that 63.82g purity is 99.9%, 2.30g purity are 99.5%
Al, high-purity Fe that 1.53g purity is 99.99%, high-purity V that 7.69g purity is 99.9%, 2.30g purity is 99.99%
Hf。
In 820 DEG C of heat preservation 45min before rolling deformation, each volume under pressure is 1.30mm, melts down guarantor per between rolling deformation twice
Warm 5min, the initial average height of ingot casting are 19.0mm, have finally been rolled with a thickness of 5.0mm, maximum rolling reduction reaches 75%.
Comparative example 1
Raw material is configured in the way of embodiment 1, during the preparation process without isothermal holding, directly carries out subsequent roll
Deformation process processed, when total deformation reaches 20%, sample cracks, and cannot normally obtain titanium alloy.
Comparative example 2
Titanium alloy is prepared in the way of embodiment 1, difference is to configure when configuring raw material according to Ti-10V-2Fe-3Al.
The titanium alloy of Examples 1 to 5 and comparative example 2 is cut out into tensile sample, stretching examination as shown in Figure 1 using wire cutting
Sample.Each sample at least cuts out 5 stretching samples, it is ensured that the repeatability of data.Strain rate 0.375mm/min's
Tensile property test is carried out on 5982 tensile sample machine of Instron.Stress-strain diagram is as shown in Figure 2.Pass through ess-strain song
Line, which can see, to be added after Hf, and a yield point (stress induction point) for alloy improves, and illustrates that martensite transformation stress improves,
Martensitic Transformation is occurring, is needing higher stress.Because martensitic traoformation, which occurs, consumes more energy, it may occur that more
More energy conversions.
Simultaneously near stretching fracture titanium alloy carry out metallographic microstructure observation, test result is similar, it can be seen that
A large amount of needle-shaped insulation martensite is formd in the microscopic structure of alloy, this is because during stretching, due to stress induced
It is formed, divides β crystal grain, play the role of refining crystal grain.Meanwhile it can be observed that twin, alleviates stress collection to a certain extent
In, be conducive to be plastically deformed, to show good plasticity.Wherein, the metallographic microstructure figure of embodiment 1 is as shown in Figure 3.
SEM morphology analysis also is carried out to fracture, testing result is as shown in Figure 4；By fracture apperance it can be seen that fracture
There is a large amount of molten drop at place, makes alloy that certain softening occur in drawing process, shows excellent plasticity.
Tensile property test result is as shown in table 1.
The Mechanics Performance Testing for the titanium alloy that 1 Examples 1 to 5 of table and comparative example 2 obtain
As shown in Table 1, it can be seen that the yield strength of the alloy of Hf, fracture is added by force in the titanium alloy that the present invention obtains
Degree, elongation percentage all improve, and especially intensity declines only under the premise of within 100MPa, under the conditions of being uniaxially stretched
Elongation percentage reaches 52.81%, be document in Ti-10V-2Fe-3Al 277.94%~880.16%, compared to under the conditions of
The 460.01% of Ti-10V-2Fe-3Al (identical method of smelting and rolling mill practice, elongation percentage 11.48%).
As can be seen from the above embodiments, the present invention promotes the mechanical property of titanium alloy by the content of control each element,
Under the premise of keeping intensity, the plasticity of titanium alloy is significantly improved；And the anti-low cycle fatigue property of obtained titanium alloy is excellent.
The above is only a preferred embodiment of the present invention, it is not intended to limit the present invention in any form.It should
It points out, for those skilled in the art, without departing from the principle of the present invention, if can also make
Dry improvements and modifications, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (10)
1. a kind of high-ductility titanium alloy, based on mass content, including Al 3%, V 10%, Fe 2%, the and of Hf0.35~3.0%
The Ti of surplus and inevitable impurity.
2. high-ductility titanium alloy according to claim 1, which is characterized in that described inevitable based on mass content
Impurity is C≤0.1%, N≤0.03%, H≤0.015%, O≤0.15%.
3. high-ductility titanium alloy according to claim 1 or 2, which is characterized in that the high-ductility titanium alloy includes Al
3%, the Ti and inevitable impurity of V 10%, Fe 2%, Hf0.75% and surplus.
4. the preparation method of high-ductility titanium alloy described in claims 1 to 3 any one, which is characterized in that including following step
It is rapid:
(1) cast alloy base will be obtained after the alloy raw material melting of corresponding alloying component；
(2) it is deformed after the cast alloy base that the step (1) obtains being carried out isothermal holding, obtains high-ductility titanium alloy.
5. the preparation method according to claim 4, which is characterized in that melting is vacuum arc melting in the step (1),
The temperature of the vacuum arc melting is 2000~2900 DEG C.
6. preparation method according to claim 4 or 5, which is characterized in that in the step (1) melting number 8 times with
On, each smelting time is in 1min or more.
7. the preparation method according to claim 4, which is characterized in that the temperature of isothermal holding is 780 in the step (2)
~820 DEG C, the time of isothermal holding is 40~50min.
8. the preparation method according to claim 4, which is characterized in that be deformed into rolling deformation in the step (2)；It is described
The total deformation of rolling deformation is 70~75%.
9. preparation method according to claim 8, which is characterized in that the rolling deformation is multi- pass rolling；
When using multi- pass rolling, after rolling per pass, alloy preform after rolling is kept the temperature into 5~7min at 780~820 DEG C.
10. the preparation method according to claim 4, which is characterized in that further include the deforming alloy water that will be obtained after deformation
It is cooled to room temperature, obtains high-ductility titanium alloy.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10204560A (en) * | 1997-01-21 | 1998-08-04 | Nippon Steel Corp | Tial-based alloy excellent in oxidation resistance |
| CN108374105A (en) * | 2018-04-01 | 2018-08-07 | 温州市赢创新材料技术有限公司 | Wearable device titanium alloy and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10204560A (en) * | 1997-01-21 | 1998-08-04 | Nippon Steel Corp | Tial-based alloy excellent in oxidation resistance |
| CN108374105A (en) * | 2018-04-01 | 2018-08-07 | 温州市赢创新材料技术有限公司 | Wearable device titanium alloy and preparation method thereof |
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