CN109930100A - A kind of damage tolerance titanium alloy plate rolling and mating heat treatment process - Google Patents
A kind of damage tolerance titanium alloy plate rolling and mating heat treatment process Download PDFInfo
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- CN109930100A CN109930100A CN201910249339.8A CN201910249339A CN109930100A CN 109930100 A CN109930100 A CN 109930100A CN 201910249339 A CN201910249339 A CN 201910249339A CN 109930100 A CN109930100 A CN 109930100A
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Abstract
The present invention relates to titanium alloy plate rolling and mating technical field of heat treatment, specially a kind of to be suitable for the alpha+beta types such as TC4, TA15 and the rolling of nearly α type damage tolerance titanium alloy plate and mating heat treatment process.In order to obtain Original β grain, conventional titanium alloy preparation process is usually the forging of alpha+beta two-phase section or rolling deformation, is then heat-treated in the monophase field β, however the prior βgrainsize obtained under the technique is unevenly distributed, and leads to Mechanical Fluctuation.The present invention studies β crystal grain recrystallization and growth behavior by carrying out deformation technique, plate finishing temperature is arranged in the monophase field β, then implement 40%~70% rolling reduction of Dan Huoci, plate is placed in the monophase field β after the completion of rolling and carries out solution treatment, obtain uniform Original β grain, that is the leading technology route of " rolling of β phase region "+" heat treatment of β phase region ", can be applied to the technical fields such as Aeronautics and Astronautics, ocean.
Description
Technical field
The present invention relates to titanium alloy plate rolling and mating technical field of heat treatment, specially a kind of to be suitable for TC4, TA15
Equal alpha+beta types and the rolling of nearly α type damage tolerance titanium alloy plate and mating heat treatment process, can be applied to Aeronautics and Astronautics, ocean etc.
Technical field.
Background technique
Titanium alloy is obtained because of specific strength with higher, excellent corrosion resistance in fields such as Aeronautics and Astronautics, oceans
It is widely applied.Titanium alloy with coarse Original β grain show excellent damage tolerance performance (low crack growth rate and
High-fracture toughness), it is widely used in aviation key load bearing component, Fig. 1 sees in typical displaing micro tissue topography.
The microscopic structure for having coarse Original β grain to obtain titanium alloy, conventional preparation techniques are the forgings of alpha+beta two-phase section
It makes or rolling deformation, is then heat-treated in the monophase field β, process route is shown in Fig. 2.But shown by a large amount of result of study it is right
It is unevenly distributed in plate by the prior βgrainsize that " rolling of alpha+beta two-phase section "+" heat treatment of β phase region " obtains, specific example
See Fig. 3, Fig. 4, Fig. 5.As shown in figure 3, according to the macrostructure pattern with a thickness of 75mm plate prepared by Fig. 2 leading technology, point
Sampling carries out high power microstructure observation not at surface layer (position 1), center (position 2), and analysis prior βgrainsize is uniform
Property.The gabarit on surface layer and the center position Liang Ge Original β grain is extracted, as a result sees Fig. 4, Fig. 5 respectively, it can be seen that benefit
It is unevenly distributed with the slab prior βgrainsize of leading technology preparation traditional in Fig. 2, shows as that there are ultra-fine in local location
Or super thick Original β grain aggregation.Prior βgrainsize is unevenly distributed the mechanical property for being unfavorable for material.In addition, super large
Original β grain is not but also plate crystallite dimension meets relevant MAT'L specification.Therefore, plate is former after improving the heat treatment of β phase region
The uniformity of beginning β crystallite dimension is the technical bottleneck that such based plate needs to solve.
Summary of the invention
It is an object of the invention to propose a kind of damage tolerance titanium alloy plate rolling and mating heat treatment process, with optimization
Damage tolerance type titanium alloy thick plate prior βgrainsize uniformity.
Technical scheme is as follows:
A kind of damage tolerance titanium alloy plate rolling and mating heat treatment process plate finishing temperature are arranged single-phase in β
Area then implements 40%~70% rolling reduction of Dan Huoci, plate is placed in the monophase field β after the completion of rolling and is dissolved
Processing, obtains uniform Original β grain, i.e. the leading technology route of " rolling of β phase region "+" heat treatment of β phase region ".
The finish to gauge of titanium alloy plate is heated temperature by the damage tolerance titanium alloy plate rolling and mating heat treatment process
Degree is set as 30~50 degrees Celsius of transformation temperature or more, and the deflection of plate finish to gauge is 40%~70%.
The damage tolerance titanium alloy plate rolling and mating heat treatment process after the completion of finish to gauge, carry out at plate heat
Reason, heat treatment temperature are 20~50 degrees Celsius of transformation temperature or more.
The damage tolerance titanium alloy plate rolling and mating heat treatment process, when setting heat preservation according to plate thickness
Between, soaking time is 0.5~1.5min/mm thickness.
The damage tolerance titanium alloy plate rolling and mating heat treatment process, Original β grain are evenly distributed unanimously, brilliant
Particle size is less than 2mm.
Optimize the design principle of damage tolerance type titanium alloy thick plate prior βgrainsize uniformity technique such as in the present invention
Under:
(1) in β phase region heat treatment process, the growth of β crystal grain is mainly by the control of two kinds of factors: Thermodynamics and dynamic
Mechanics factor, wherein Thermodynamics are that total interface can be reduced, i.e., big crystal grain growth little crystal grain reduces；Kinetic factor is then
Temperature, temperature is higher, and atomic diffusion rates are faster, is more conducive to grain growth.Two kinds of factor collective effects are in grain growth
Overall process is likely to become major control factors in one of factor of a certain stage, and in another stage, then possible transition is
Secondary cause.
(2) rolling mill practice of plate has very important influence to the growth behavior of β crystal grain before β is heat-treated, and the present invention is logical
Introducing " rolling of β phase region " is crossed, instead of traditional " rolling of alpha+beta two-phase section " technique, the deformation improved at plate different location is uniform
Property, so that the distortion energy difference of plate different location is smaller after rolling deformation, so that in the subsequent monophase field β heat treatment process
The Recrystallization nucleation of each position and β grain growth are essentially identical, avoid ultra-fine or super large Original β grain appearance.
Compared with the prior art, it advantages of the present invention and has the beneficial effect that:
1, in order to obtain Original β grain, conventional titanium alloy preparation process is usually the forging of alpha+beta two-phase section or rolling deformation,
It is then heat-treated in the monophase field β, however the prior βgrainsize obtained under the technique is unevenly distributed, and leads to mechanical property wave
It is dynamic.β crystal grain is recrystallized by carrying out deformation technique and growth behavior is studied, the present invention propose a kind of rolling of titanium alloy plate and
Mating heat treatment process, specifically: by the setting of plate finishing temperature in the monophase field β, then implement the 40%~70% of Dan Huoci
Rolling reduction, after the completion of rolling by plate be placed in the monophase field β carry out solution treatment, obtain uniform Original β grain,
That is the leading technology route of " rolling of β phase region "+" heat treatment of β phase region ".
2, " rolling of β phase region " proposed by the present invention+" heat treatment of β phase region " leading technology technology, the α such as TC4, TA15 of development
The Original β grain of+β type and nearly alpha titanium alloy plate is more compared with traditional handicraft (" rolling of alpha+beta two-phase section "+" heat treatment of β phase region ")
Uniformly, the overall technology for promoting damage tolerance type titanium alloy plate is horizontal.
Detailed description of the invention
Fig. 1 is titanium alloy microstructure's pattern with coarse Original β grain.
Fig. 2 is to obtain tradition " rolling of alpha+beta two-phase section "+" heat treatment of the β phase region " process route with Original β grain tissue
Figure.
Fig. 3 is the low power group of TC4 titanium alloy thick plate under traditional " rolling of alpha+beta two-phase section "+" heat treatment of β phase region " process route
Knit pattern.
Fig. 4 is the Original β grain distribution schematic diagram in Fig. 3 at position 1.
Fig. 5 is the Original β grain distribution schematic diagram in Fig. 3 at position 2.
Fig. 6 is " rolling of the monophase field β " proposed by the present invention+" heat treatment of the monophase field β " process route view.
Fig. 7 is the TC4 sheet alloy Original β grain optical microstructure pattern obtained using the preparation process in Fig. 6.
Fig. 8 is the pattern after being labeled β grain contours original in Fig. 6.
Fig. 9 is original β crystal grain distribution schematic diagram in Fig. 6.
Specific embodiment
In the specific implementation process, the preparation flow of titanium alloy plate is general are as follows: ingot casting melting, slab are forged, in plate
Between rolling, plate finish to gauge, plate heat treatment, present invention is generally directed to titanium alloy plate finish to gauge technique and subsequent mating heat treatments
Technique is realized by existing technology in the preparation process before plate finish to gauge.
As shown in fig. 6, in order to obtain the damage tolerance type titanium alloy plate with Original β grain, the present invention proposes " β phase
Area's rolling "+" heat treatment of β phase region " leading technology is as follows:
The finish to gauge heating temperature of titanium alloy plate is set as transformation temperature (the complete transition temperature of α → β) or more 30~50 to take the photograph
Family name's degree sets soaking time according to the thickness of plate blank, completes the finish to gauge of plate, and plate after the completion of heat preservation in 1 fire time
The deflection of finish to gauge is 40%~70% (preferably 55%).After the completion of finish to gauge, plate heat treatment is carried out, heat treatment temperature is phase
More than height 20~50 degrees Celsius, soaking time is set according to plate thickness.
In the following, being further elaborated on by embodiment and attached drawing to the present invention.
Comparative example 1
Using conventional processing routes, i.e. transformation temperature (the complete transition temperature of α → β) finish to gauge after 50 degrees Celsius of heat preservations below, and
Acquisition TC4 titanium alloy 75mm slab after the heat treatment of β phase region afterwards, macrostructure pattern and prior βgrainsize distribution such as Fig. 3~
Shown in Fig. 5, it is seen that prior βgrainsize is unevenly distributed under the technique, and there are ultra-fine or super large Original β grains.
Embodiment 1
During plate rolling, by the heating and temperature control of slab in the monophase field β, when calculating heat preservation according to slab thickness
Between, plate rolling is carried out after the completion of slab heat preservation, using a fire time by the target thickness of slab rolling to plate, which is known as
" rolling of β phase region ".After the completion of plate rolling, into " heat treatment of the β phase region " stage, plate is heated to the monophase field β, and according to it
THICKNESS CALCULATION soaking time, it is cooling in air-cooled mode after heat preservation.
As shown in fig. 6,40 take the photograph that is, more than transformation temperature (the complete transition temperature of α → β) using process route proposed by the present invention
Finish to gauge after the heat preservation of family name's degree, and the deflection of plate finish to gauge is 55%.After the completion of finish to gauge, plate heat treatment is carried out, in β phase region (this
Embodiment be transformation temperature more than 40 degrees Celsius, soaking time 1.5h) heat treatment after, obtain TC4 titanium alloy 75mm slab.
As shown in fig. 7~fig. 9, under " rolling of β phase region "+" heat treatment of β phase region " leading technology, micro- group of the high power of plate
It knits, Original β grain distribution map, the prior βgrainsize at different location is more consistent, and crystallite dimension is respectively less than 2mm.Illustrate
Under process route proposed by the present invention, the Original β grain of plate is evenly distributed unanimously, does not occur conventional preparation techniques route (figure
2) the ultra-fine or super large Original β grain under.The uniform crystal grain distribution of the present invention is beneficial to the mechanical property of material, is promoted
The overall technology of plate is horizontal.
Embodiment 1, comparative example 1 are compared as it can be seen that using " rolling of β phase region "+" heat treatment of β phase region " integrated artistic
The prior βgrainsize uniformity of TC4 titanium alloy thick plate is significantly improved after route.
Embodiment and comparative example the result shows that, " rolling of β phase region " of titanium alloy plate proposed by the present invention+" at β phase region heat
Reason " leading technology is an overall technology." rolling of β phase region " technique and " heat treatment of β phase region " in conventional panels preparation process
It is individualism, i.e., from being not carried out " heat treatment of β phase region " after " rolling of β phase region ", or from " β is not carried out before " heat treatment of β phase region "
Phase region rolling ".Being obtained using the present invention, there is the titanium alloy of coarse Original β grain to show excellent resistance to crack extension performance,
It is widely used in aviation key load bearing component.
Claims (5)
1. a kind of damage tolerance titanium alloy plate rolling and mating heat treatment process, which is characterized in that set plate finishing temperature
It sets in the monophase field β, then implements 40%~70% rolling reduction of Dan Huoci, it is single-phase that plate is placed in β after the completion of rolling
Area carries out solution treatment, obtains uniform Original β grain, the i.e. leading technology of " rolling of β phase region "+" heat treatment of β phase region "
Route.
2. damage tolerance titanium alloy plate rolling described in accordance with the claim 1 and mating heat treatment process, which is characterized in that will
The finish to gauge heating temperature of titanium alloy plate is set as 30~50 degrees Celsius of transformation temperature or more, and the deflection of plate finish to gauge is 40%~
70%.
3. damage tolerance titanium alloy plate rolling described in accordance with the claim 1 and mating heat treatment process, which is characterized in that eventually
After the completion of rolling, plate heat treatment is carried out, heat treatment temperature is 20~50 degrees Celsius of transformation temperature or more.
4. damage tolerance titanium alloy plate rolling described in accordance with the claim 1 and mating heat treatment process, which is characterized in that root
Soaking time is set according to plate thickness, soaking time is 0.5~1.5min/mm thickness.
5. damage tolerance titanium alloy plate rolling described in accordance with the claim 1 and mating heat treatment process, which is characterized in that former
Beginning β crystal grain distribution uniformity, crystallite dimension are less than 2mm.
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Cited By (3)
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| CN111763850A (en) * | 2020-07-13 | 2020-10-13 | 西北有色金属研究院 | Processing method of fine-grain superplasticity TA15 titanium alloy medium-thick plate |
| CN112662971A (en) * | 2020-10-28 | 2021-04-16 | 西安交通大学 | High-strength TWIP titanium alloy with gradient structure and hot rolling method thereof |
| CN115178597A (en) * | 2022-07-11 | 2022-10-14 | 宝武特冶钛金科技有限公司 | Hot processing method for simultaneously improving surface quality and tensile strength of titanium alloy rolled bar |
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| CN112662971A (en) * | 2020-10-28 | 2021-04-16 | 西安交通大学 | High-strength TWIP titanium alloy with gradient structure and hot rolling method thereof |
| CN112662971B (en) * | 2020-10-28 | 2022-05-20 | 西安交通大学 | High-strength TWIP titanium alloy with gradient structure and hot rolling method thereof |
| CN115178597A (en) * | 2022-07-11 | 2022-10-14 | 宝武特冶钛金科技有限公司 | Hot processing method for simultaneously improving surface quality and tensile strength of titanium alloy rolled bar |
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Application publication date: 20190625 |