CN109207893A - A kind of heat treatment method obtaining TC21 titanium alloy difference lamellar spacing - Google Patents
A kind of heat treatment method obtaining TC21 titanium alloy difference lamellar spacing Download PDFInfo
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- CN109207893A CN109207893A CN201811307358.3A CN201811307358A CN109207893A CN 109207893 A CN109207893 A CN 109207893A CN 201811307358 A CN201811307358 A CN 201811307358A CN 109207893 A CN109207893 A CN 109207893A
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- titanium alloy
- heat treatment
- lamellar spacing
- treatment method
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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
- 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
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a kind of heat treatment methods for obtaining Ti alloy with high performance different levels tissue, and biphase titanium alloy forging state bar is processed into plate, is heat-treated using hot modeling test machine.The present invention is aerospace TC4 titanium alloy with titanium alloy, is being heated to beta transformation point temperatures above, obtains different lamellar spacing α tissues and its grain size and its corresponding related mechanical property with 10 cooling rates.It is not only that material processing provides advantageous condition, the performance needed for it is also provided for final product.
Description
Technical field
The present invention relates to a kind of heat treatment method of titanium alloy difference lamellar spacing, especially a kind of acquisition TC21 titanium alloy
The heat treatment method of different lamellar spacings.
Background technique
TC21 titanium alloy is the high-strength high-ductility titanium alloy that the coloured research institute in northwest China voluntarily develops, and possesses specific strength height,
The advantages that low-density, heat-proof corrosion-resistant and good weldability, mainly applies aerospace field at present.The study found that Wei Shi group
The fracture toughness knitted is higher than the fracture toughness of equiaxed structure.Under Ding Wending strain rate, the increase of initial alpha lamellar spacing can drop
Low-alloyed flow stress and the sensitivity of strain rate for increasing alloy, and lamella α is easier to be broken into thin α phase.It is forged in β
The thin lamellar microstructure of air-cooled acquisition has lower fatigue crack growth rate afterwards, and after alpha+beta forging it is air-cooled obtain it is thick
Lamellar microstructure, crack growth rate is very fast, and fatigue crack growth rate is accelerated with the increase of tissue lamellar thickness.?
Fatigue crack steady propagation area, crackle are extended forward with strip cyclic mechanism.There are also studies have shown that cooling rate to TC21 alloy
Lamellar spacing play a decisive role, and restrict the performance of alloy, with the increase of cooling velocity, α lamellar spacing gradually subtracts
Small, the form of α boundling is also changed, and the microscopic structure in different crystal grain is more and more uneven.Gradually subtract with lamella α thickness
Small, the microhardness of TC21 alloy first rises to be declined afterwards.Some researchers show crackle in Wei Shi lamella α tissue development path
Complications increase total length of cracks, and crackle, which further expands, needs to consume more energy, and crack branching is more, dispersion
The stress field of crack tip, the energy absorbed in destructive process is big, therefore the fracture toughness of Widmannstatten structure is big, crack growth rate
It is small.
TC21 titanium alloy tissue not only influences Forming Quality, but also the mechanical property and service life that will directly affect its product.
The development trend of world's titanium alloy is developed towards high performance direction at present, and the approach of exploitation high-performance TC21 titanium alloy has out
Hair prepares material new process, reasonable heat treatment etc..Reasonable heat treatment can not only mention for material processing
For advantageous condition, and the performance needed for it can be provided for final product.
Summary of the invention
The object of the present invention is to provide a kind of heat treatment methods for obtaining TC21 titanium alloy difference lamellar spacing.This hair
Bright with titanium alloy is aerospace TC21 titanium alloy, is being heated to beta transformation point (975 ± 5 DEG C) temperatures above (1000 DEG C), with
It is cooled to room temperature using 2 cooling rates, to obtain different lamellar spacing α tissues and its corresponding related mechanical property.No
Only material processing provides advantageous condition, and the performance needed for it is also provided for final product.
Technical solution of the present invention: a kind of heat treatment method obtaining TC21 titanium alloy difference lamellar spacing, two-phase titanium
Alloy forging state bar is processed into plate, is heat-treated using phase transformation instrument.
In the heat treatment method above-mentioned for obtaining TC21 titanium alloy difference lamellar spacing, the heat treatment is；By two-phase
Titanium alloy sample is heated to 1000 DEG C, after keeping the temperature 15min, is cooled to room temperature respectively with 0.5 DEG C/s, 2 DEG C/s.
In the heat treatment method above-mentioned for obtaining TC21 titanium alloy difference lamellar spacing, the titanium alloy is that TC21 titanium closes
Gold.
In the heat treatment method above-mentioned for obtaining TC21 titanium alloy difference lamellar spacing, the ingredient of the TC21 titanium alloy
Mass percent are as follows: Al:6.47%；Zr:2.28%；Sn:2.18%；Mo:3.23%；Cr:1.51%；Nb:2.11% and Si:
0.11%, surplus is Ti and inevitable impurity.
The utility model has the advantages that the performance of titanium alloy depends primarily on its microscopic structure, and the microscopic structure of alloy depends on pair
The heat treatment process that alloy carries out.Reasonable heat treatment can provide advantageous condition not only for material processing, again
Performance needed for it can be provided for final product.Therefore applicant consider to titanium alloy of the present invention carry out heat treatment process so that
Its comprehensive performance is more preferable.According to common sense it is found that various heat treatment process are almost required by alloy to be heated slowly to centainly
Temperature keeps enough time, then cooling with Reasonable Speed.These steps are almost essential basic in heat treatment process
Means, meanwhile, any heat treatment process all must can not violate its basic theory with the basic theories of this field for foundation,
For different individual products, technological difficulties and it is creative be just embodied in the specific process parameters of individual products and
In the screening of details.Therefore, different lamellar spacing α tissues and its grain size and its corresponding related mechanical property are obtained, is needed
Want applicant carry out a large amount of experimental study with the optimal heat treatment mode of determination, heat treatment number, heat treatment temperature, time with
And cooling rate.
The present invention, which passes through, determines different cooling speed, to obtain different lamellar spacing α tissues.I.e. the present invention is aviation with titanium alloy
Space flight TC21 titanium alloy is being heated to beta transformation point (975 ± 5 DEG C) temperatures above (1000 DEG C), to use 2 cooling rates
It is cooled to room temperature, to obtain different lamellar spacing α tissues and its corresponding related mechanical property.It is not only that material is processed
Journey provides advantageous condition, and the performance needed for it is also provided for final product.
Detailed description of the invention:
Fig. 1 is the TC21 titanium alloy microstructure after 1000 DEG C of thermal deformations: (a) 0.5 DEG C/s, (c) 2 DEG C/s.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention will be further described.
Embodiment 1: a kind of heat treatment method obtaining TC21 titanium alloy difference lamellar spacing:
Alloy used be TC21 titanium alloy, ingredient percent are as follows: Al:6.47%, Zr:2.28%, Sn:
2.18%, Mo:3.23%, Cr:1.51%, Nb:2.11% and Si:0.11%, surplus are Ti and inevitable impurity.
Heat treatment method: the TC21 titanium alloy forging state bar of the above ingredient is processed into plate, is heated to using phase transformation instrument
It 1000 DEG C, after keeping the temperature 15min, is cooled to room temperature respectively with 0.2 DEG C/s, 2 DEG C/s.Figure is seen by obtained TC21 titanium alloy microstructure
1.As shown in Figure 1, when cooling rate is 0.5 DEG C/s and 2 DEG C/s, lamellar spacing is respectively 1.2 μm and 0.5 μm.α phase in titanium alloy
Precipitation process is the process that a forming core and core are grown up, and alloying component and cooling rate will have a direct impact on the position of forming core, nucleus quantity
And growth rate.When slow cooling, due to degree of supercooling is small and crystal boundary energy is higher, in the easily first forming core of grain boundaries, then to transgranular
Slowly growth forms the more coarse α item of lamella, and furthermore cooling rate is low, can also be with the generation of grain boundary networks α.When cooling rate increases
When, α lamella size reduces.
Claims (4)
1. a kind of heat treatment method for obtaining TC21 titanium alloy difference lamellar spacing, it is characterised in that: biphase titanium alloy is forged state
Bar is processed into plate, is heat-treated using phase transformation instrument.
2. obtaining the heat treatment method of TC21 titanium alloy difference lamellar spacing as described in claim 1, it is characterised in that: described
Heat treatment be；Biphase titanium alloy sample is heated to 1000 DEG C, after keeping the temperature 15min, is cooled to respectively with 0.5 DEG C/s, 2 DEG C/s
Room temperature.
3. obtaining the heat treatment method of TC21 titanium alloy difference lamellar spacing as claimed in claim 1 or 2, it is characterised in that:
The titanium alloy is TC21 titanium alloy.
4. obtaining the heat treatment method of TC21 titanium alloy difference lamellar spacing as claimed in claim 3, it is characterised in that: described
TC21 titanium alloy ingredient percent are as follows: Al:6.47%；Zr:2.28%；Sn:2.18%；Mo:3.23%；Cr:
1.51%；Nb:2.11% and Si:0.11%, surplus are Ti and inevitable impurity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111705280A (en) * | 2020-08-03 | 2020-09-25 | 贵州大学 | Dual-phase titanium alloy component with long fatigue life and method for improving fatigue life of dual-phase titanium alloy component |
-
2018
- 2018-11-05 CN CN201811307358.3A patent/CN109207893A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111705280A (en) * | 2020-08-03 | 2020-09-25 | 贵州大学 | Dual-phase titanium alloy component with long fatigue life and method for improving fatigue life of dual-phase titanium alloy component |
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Application publication date: 20190115 |