CN108754371A - A kind of preparation method refining nearly α high-temperature titanium alloys crystal grain - Google Patents
A kind of preparation method refining nearly α high-temperature titanium alloys crystal grain Download PDFInfo
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- CN108754371A CN108754371A CN201810506636.1A CN201810506636A CN108754371A CN 108754371 A CN108754371 A CN 108754371A CN 201810506636 A CN201810506636 A CN 201810506636A CN 108754371 A CN108754371 A CN 108754371A
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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 refining nearly α high-temperature titanium alloys crystal grain, belongs to titanium alloy technical field, can solve the problems, such as that the matching of existing nearly α high-temperature titanium alloys intensity-plasticity-toughness is relatively low, and low temperature multi-pass list roller angular rolling is carried out to as cast condition blank；Sample is cut out from obtained forging blank and carries out β phase regions or alpha+beta phase region rapid thermal treatment, you can obtains the nearly alpha high-temperature titanium alloys that α phase crystallite dimensions are less than 2 μm.The crystallite dimension of α phases can be refined to 1.2 μm by the nearly α high-temperature titanium alloys that the present invention obtains, the alloy under this size can get optimal comprehensive mechanical property again, its tensile strength is up to 1126.3MPa, and yield strength is up to 1097.5 MPa, and elongation percentage is up to 18.6%.The present invention can obtain the thinner very high nearly α high-temperature titanium alloys material of α phases crystal grain and intensity and toughness by adjusting the technological parameter of low temperature multi-pass list roller angular rolling in conjunction with subsequent β phase regions or alpha+beta phase region rapid thermal treatment.
Description
Technical field
The invention belongs to titanium alloy technical fields, and in particular to a kind of preparation method refining nearly α high-temperature titanium alloys crystal grain.
Background technology
Nearly α high-temperature titanium alloys are one of critical materials of modern aeroengine, it is mainly used as the pressure of aero-engine
Mechanism of qi disk blade, casing reduce thrust-weight ratio to mitigate engine quality.Performance requirement right and wrong of the engine to high-temperature titanium alloy
It is often harsh, it require titanium alloy structure material with high specific strength, high specific stiffness, high tenacity, high damage tolerance and
The excellent comprehensive performance matching such as solderable.Since these performance indicators require to be often lance to the ingredient of material with microstructure
Shield, therefore to can no longer meet titanium alloy multiple towards high speed, enlargement, structure as structural material for simple improvement ingredient
The fastenings such as each load-carrying member of the weaponrys such as great-leap-forward development, aerospace, weapons, the ship in the directions such as hydridization, load bolt
Part proposes clear demand to high-strength titanium alloy and superhigh intensity titanium alloy.In recent years, traditional hot-working process as forging,
The material forming methods such as rolling and extruding are gradually used in titanium alloy with its structure property of optimising and adjustment, are realized to a certain extent
Intensity with it is moulding while optimize, but numerous studies it has been proved that traditional thermal deformation technique in the sense of organization for improving titanium alloy
The shortcomings of there are power attenuations for energy aspect greatly, improving performance effect is undesirable, still cannot break through titanium alloy development and application at present
" bottleneck ", and a large amount of research have shown that the sizes of α phase crystallite dimensions to the intensity of titanium alloy and it is moulding have a significant impact, refine
α phase crystallite dimensions are proved to be able to effectively enhance the intensity and plasticity of titanium alloy, at the same time, to the titanium alloy after hot-working
Material carries out a series of heat treatment and gradually obtains the favor of researcher, wherein rapid thermal treatment with it at the heat of short time
During reason so that crystal grain has little time to grow up and crystal grain thinning and slowly valued by people.
Invention content
The present invention provides one kind for the relatively low problem of the matching of existing nearly α high-temperature titanium alloys intensity-plasticity-toughness
Refine the preparation method of nearly α high-temperature titanium alloys crystal grain.
The present invention adopts the following technical scheme that：
A kind of preparation method refining nearly α high-temperature titanium alloys crystal grain, includes the following steps：
The first step passes through alpha+beta/beta transformation point of the nearly α high-temperature titanium alloys of Metallography method determination；
Second step, low temperature multi-pass list roller angular rolling：Nearly α high-temperature titanium alloys 300-400 DEG C of progress below alpha+beta/beta transformation point
The rapid forge that deflection is 70% provides more energy to obtain higher distortion energy for the precipitation of subsequent crystal grain, will
Rate of deformation is 1mm/s；Sample after rapid forge is rolled in identical temperature, by the thickness control of sample in 1mm,
To carry out single roller angular rolling；It is 200mm that length is cut on the sample after rolling using Wire EDM, and width is 20mm's
Sample, the 300-400 DEG C of progress low temperature multi-pass list roller angular rolling below alpha+beta/beta transformation point；
Third walks, the rapid thermal treatment near alpha+beta/beta transformation point：Sample after low temperature multi-pass list roller angular rolling is passed through into electricity
The sample of spark wire cutting certain size, respectively 15 DEG C more than alpha+beta/beta transformation point, at alpha+beta/beta transformation point, alpha+beta/β phase transformations
Or less 15 DEG C heat preservation 2min after, water quenching cooling to room temperature.
The process of the list roller angular rolling of low temperature multi-pass described in second step is as follows：First by the nearly α high-temperature titanium alloys after rolling
Roller sheet carries out circumferential shear-deformable in high pressure torsion machine, and sample original depth is 1mm, through it is circumferential it is shear-deformable after thickness be
Sample is then carried out Equal Channel Angular Pressing, the thickness of channel height 1mm, i.e. sample after Equal Channel Angular Pressing by 0.96mm
Still be 1mm, wherein sample be subjected to circumferential direction it is shear-deformable is carried out in succession with Equal Channel Angular Pressing, in high pressure torsion machine into
Row.
The specimen size cut in third step is 60mm*15mm*1mm.
Since rolling pass has an impact the microscopic structure of sample with mechanical property, to avoid variable excessive, using 3
Secondary single roller angular rolling.
Beneficial effects of the present invention are as follows：
1. the present invention passes through low temperature multi-pass list roller angular rolling so that crystal grain on the basis of different from traditional thermal deformation technique
Inside obtains more twins, dislocation, these defects can store more distortion energy, to significantly reduce recrystallization temperature,
Promote recrystallization, further by retaining the recrystal grain of refinement in β phase regions or alpha+beta phase region rapid thermal treatment, it is made to come not
And grow up, to refine β crystal grain.In addition, subsequent during being cooled to room temperature, low temperature multi-pass list roller angular rolling institute before
On the one hand a large amount of subgrains, twin and the dislocation remained hinders the movement of crystal boundary, on the other hand can be as the forming core position of α phases
It sets, it will significantly refinement α crystal grain is to further increase the intensity of titanium alloy and moulding.
2. it is tiny and have the matched nearly α high temperature of excellent intensity-plasticity-toughness that the present invention can prepare β grain structures
Titanium alloy, and processing method is suitable for industrialized production.
3. the crystallite dimension of α phases can be refined under 1.2 μm, then this size by the nearly α high-temperature titanium alloys that the present invention obtains
Alloy can get optimal comprehensive mechanical property, tensile strength up to 1126.3MPa, yield strength up to 1097.5 MPa,
Elongation percentage is up to 18.6%.
Description of the drawings
Fig. 1 is the SEM figures of the sample of 1030 DEG C of the rapid heat-treatment temperature of the embodiment of the present invention 1；
Fig. 2 is the SEM figures of the sample of 1030 DEG C of the rapid heat-treatment temperature of the embodiment of the present invention 2；
Fig. 3 is the SEM figures of the sample of 1030 DEG C of the rapid heat-treatment temperature of the embodiment of the present invention 3.
Specific implementation mode
Embodiment 1
The first step, nearly α high-temperature titanium alloys Ti-1100（Ti–6Al–2.75Sn–4Zr–0.4Mo–0.45Si）, alpha+beta/beta transformation point
It is measured as 1015 DEG C by metallographic method；
Second step, low temperature multi-pass list roller angular rolling：The nearly α high-temperature titanium alloys that will be prepared using vacuum induction magnetic levitation melting stove
Ti-1100 ingot castings（φ60mm*40mm）First step rapid forge, deflection 70%, rate of deformation 1mm/ are carried out at 715 DEG C
s；Sample after rapid forge is rolled at 715 DEG C, by the thickness control of sample in 1mm；Existed using Wire EDM
It is 200mm that length is cut on sample after rolling, and width is the sample of 20mm, is put into high pressure torsion machine and carries out 715 DEG C low
The deformation of warm multi-pass list roller angular rolling, above-mentioned 3 work steps is known as a wheel large plastometric set.Since rolling pass is to the micro- of sample
Tissue has an impact with mechanical property, and to avoid variable excessive, this tests the single roller angular rolling for being all made of 3 passages；
Third walks, the rapid thermal treatment near alpha+beta/beta transformation point：Sample after low temperature multi-pass list roller angular rolling is being passed through
Wire EDM cut size be 60mm*15mm*1mm sample, quickly heated up in vacuum resistance furnace respectively 1030 DEG C,
It 1015 DEG C, 1000 DEG C, after keeping the temperature 2min, is quickly put into water and is cooled to room temperature.
The mechanical property for finally measuring different temperatures rapid thermal treatment is as shown in table 1, wherein in 1030 DEG C of rapid thermal treatments
Obtained comprehensive mechanical property is preferable：Tensile strength is 1126.3MPa, yield strength 1097.5MPa, and elongation percentage is reachable
18.6%.α phase crystallite dimensions are 1.2 μm.
The mechanical property of Different Heat Treatment Conditions under 1 715 DEG C of deformation temperatures of table
Embodiment 2
The first step, nearly α high-temperature titanium alloys Ti-1100（Ti–6Al–2.75Sn–4Zr–0.4Mo–0.45Si）, alpha+beta/beta transformation point
It is measured as 1015 DEG C by metallographic method；
Second step, low temperature multi-pass list roller angular rolling：The nearly α high-temperature titanium alloys that will be prepared using vacuum induction magnetic levitation melting stove
Ti-1100 ingot castings（φ60mm*40mm）First step rapid forge, deflection 70%, rate of deformation 1mm/ are carried out at 615 DEG C
s；Sample after rapid forge is rolled at 615 DEG C, by the thickness control of sample in 1mm；Existed using Wire EDM
It is 200mm that length is cut on sample after rolling, and width is the sample of 20mm, is put into high pressure torsion machine and carries out 615 DEG C low
The deformation of warm multi-pass list roller angular rolling, above-mentioned 3 work steps is known as a wheel large plastometric set.Since rolling pass is to the micro- of sample
Tissue has an impact with mechanical property, and to avoid variable excessive, this tests the single roller angular rolling for being all made of 3 passages；
Third walks, the rapid thermal treatment near alpha+beta/beta transformation point：Sample after low temperature multi-pass list roller angular rolling is being passed through
Wire EDM cut size be 60mm*15mm*1mm sample, quickly heated up in vacuum resistance furnace respectively 1030 DEG C,
It 1015 DEG C, 1000 DEG C, after keeping the temperature 2min, is quickly put into water and is cooled to room temperature.
The mechanical property for finally measuring different temperatures rapid thermal treatment is as shown in table 2, wherein in 1015 DEG C of rapid thermal treatments
Obtained comprehensive mechanical property is preferable：Tensile strength is 1197.9MPa, yield strength 1142.5MPa, and elongation percentage is reachable
17.5%.α phase crystallite dimensions are 2.2 μm.
The mechanical property of Different Heat Treatment Conditions under 2 615 DEG C of deformation temperatures of table
Embodiment 3
The first step, nearly α high-temperature titanium alloys Ti-1100（Ti–6Al–2.75Sn–4Zr–0.4Mo–0.45Si）, alpha+beta/beta transformation point
It is measured as 1015 DEG C by metallographic method；
Second step, low temperature multi-pass list roller angular rolling：The nearly α high-temperature titanium alloys that will be prepared using vacuum induction magnetic levitation melting stove
Ti-1100 ingot castings（φ60mm*40mm）First step rapid forge, deflection 70%, rate of deformation 1mm/ are carried out at 665 DEG C
s；Sample after rapid forge is rolled at 665 DEG C, by the thickness control of sample in 1mm；Existed using Wire EDM
It is 200mm that length is cut on sample after rolling, and width is the sample of 20mm, is put into high pressure torsion machine and carries out 665 DEG C low
The deformation of warm multi-pass list roller angular rolling, above-mentioned 3 work steps is known as a wheel large plastometric set.Since rolling pass is to the micro- of sample
Tissue has an impact with mechanical property, and to avoid variable excessive, this tests the single roller angular rolling for being all made of 3 passages；
Third walks, the rapid thermal treatment near alpha+beta/beta transformation point：Sample after low temperature multi-pass list roller angular rolling is being passed through
Wire EDM cut size be 60mm*15mm*1mm sample, quickly heated up in vacuum resistance furnace respectively 1030 DEG C,
It 1015 DEG C, 1000 DEG C, after keeping the temperature 2min, is quickly put into water and is cooled to room temperature.
The mechanical property for finally measuring different temperatures rapid thermal treatment is as shown in table 3, wherein in 1030 DEG C of rapid thermal treatments
Obtained comprehensive mechanical property is preferable：Tensile strength is 1158.4MPa, yield strength 1121.6MPa, and elongation percentage is reachable
18.2%.α phase crystallite dimensions are 1.6 μm.
The mechanical property of Different Heat Treatment Conditions under 3 665 DEG C of deformation temperatures of table
Claims (3)
1. a kind of preparation method refining nearly α high-temperature titanium alloys crystal grain, it is characterised in that：Include the following steps：
The first step passes through alpha+beta/beta transformation point of the nearly α high-temperature titanium alloys of Metallography method determination；
Second step, low temperature multi-pass list roller angular rolling：Nearly α high-temperature titanium alloys 300-400 DEG C of progress below alpha+beta/beta transformation point
The rapid forge that deflection is 70% provides more energy to obtain higher distortion energy for the precipitation of subsequent crystal grain, will
Rate of deformation is 1mm/s；Sample after rapid forge is rolled in identical temperature, by the thickness control of sample in 1mm,
To carry out single roller angular rolling；It is 200mm that length is cut on the sample after rolling using Wire EDM, and width is 20mm's
Sample, the 300-400 DEG C of progress low temperature multi-pass list roller angular rolling below alpha+beta/beta transformation point；
Third walks, the rapid thermal treatment near alpha+beta/beta transformation point：Sample after low temperature multi-pass list roller angular rolling is passed through into electricity
The sample of spark wire cutting certain size, respectively 15 DEG C more than alpha+beta/beta transformation point, at alpha+beta/beta transformation point, alpha+beta/β phase transformations
Or less 15 DEG C heat preservation 2min after, water quenching cooling to room temperature.
2. a kind of preparation method refining nearly α high-temperature titanium alloys crystal grain according to claim 1, it is characterised in that：Second
The process of the list roller angular rolling of low temperature multi-pass described in step is as follows：The nearly α high-temperature titanium alloys roller sheet after rolling is turned round in high pressure first
Carry out circumferential shear-deformable in favourable turn, sample original depth is 1mm, through it is circumferential it is shear-deformable after thickness be 0.96mm, then will
Sample carries out Equal Channel Angular Pressing, and the thickness of channel height 1mm, i.e. sample after Equal Channel Angular Pressing is still 1mm, pilot scale
Sample be subjected to circumferential direction it is shear-deformable carried out in succession with Equal Channel Angular Pressing, carried out in high pressure torsion machine.
3. a kind of preparation method refining nearly α high-temperature titanium alloys crystal grain according to claim 1, it is characterised in that：Third
The specimen size cut in step is 60mm*15mm*1mm.
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Cited By (2)
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| CN109457204A (en) * | 2018-12-05 | 2019-03-12 | 贵州大学 | A method of obtaining ultra-fine grain and surface micro/nano-scale twin in TC4 titanium alloy |
| CN112962040A (en) * | 2021-01-27 | 2021-06-15 | 西安理工大学 | Rapid heat treatment method for high-strength medical titanium alloy bar |
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| CN112962040A (en) * | 2021-01-27 | 2021-06-15 | 西安理工大学 | Rapid heat treatment method for high-strength medical titanium alloy bar |
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Inventor after: Zhang Changjiang Inventor after: Feng Hong Inventor after: Guo Chongxiao Inventor after: Zhang Shuzhi Inventor after: Lv Zhidan Inventor after: Hou Zhaoping Inventor after: Han Jianchao Inventor after: Cheng Weili Inventor after: Wang Hongxia Inventor before: Zhang Changjiang Inventor before: Guo Chongxiao Inventor before: Zhang Shuzhi Inventor before: Lv Zhidan Inventor before: Hou Zhaoping Inventor before: Han Jianchao Inventor before: Feng Hong Inventor before: Cheng Weili Inventor before: Wang Hongxia |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200821 Address after: 035404 Shenshan Xiang Guan Guan Ying Cun, Dingxiang County, Xinzhou City, Shanxi Province Patentee after: Shanxi Zhonggong Heavy Forging Co., Ltd Address before: 030024 West Street, Taiyuan, Shanxi, No. 79, No. Patentee before: Taiyuan University of Technology |