CN110396656A - A kind of composite reinforcement process of superhigh intensity TB8 titanium alloy - Google Patents
A kind of composite reinforcement process of superhigh intensity TB8 titanium alloy Download PDFInfo
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- CN110396656A CN110396656A CN201910771324.8A CN201910771324A CN110396656A CN 110396656 A CN110396656 A CN 110396656A CN 201910771324 A CN201910771324 A CN 201910771324A CN 110396656 A CN110396656 A CN 110396656A
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- titanium alloy
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- predeformation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
Abstract
The present invention provides a kind of composite reinforcement process for obtaining superhigh intensity TB8 titanium alloy.By successively carrying out predeformation, dynamic recrystallization treatment, eventually deformation and ageing treatment to original solid solution state TB8 titanium alloy, original β open grain structure is changed into β fine grain a large amount of acicular α hardening constituents and dislocation existing tissue topography jointly.This composite reinforcement process can give full play to the solution strengthening of TB8 titanium alloy, refined crystalline strengthening, the synergistic effect of four kinds of strengthening mechanisms of processing hardening and precipitation strength, obtained TB8 titanium alloy can get 1500 MPa(and be even higher than 1600 MPa) more than tensile strength, 200 MPa or more of intensity can be improved compared with common heat treatment.The composite reinforcement process process is simple, and effect is obvious, has a extensive future.
Description
Technical field
The present invention relates to a kind of composite reinforcement process of superhigh intensity TB8 titanium alloy, belong to nonferrous materials and its add
Work technical field.
Background technique
β -21s titanium alloy is a kind of metastable beta-type titanium alloy that the U.S. Timet company nineties in last century develops, the conjunction
Fitting has the advantages that high-intensitive, anti-oxidant and corrosion-resistant, therefore is widely applied in aviation field.Given this alloy is many
Advantage, China copy β -21s titanium alloy in the enforcement period of the ninth five-year plan, and the domestic trade mark is TB8, ingredient Ti-15Mo-3Al-
2.7Nb-0.2Si.Studies have shown that TB8 titanium alloy can get the high intensity of 1300 MPa after ageing treatment, and have good
Weldability is currently mainly used as Flight Vehicle Structure part, engine structure and key position fastener etc..
Currently, the requirement with aircraft industry to aircraft long-life, economic flight is increasingly harsh, aircraft towards lightweight,
High security direction is developed, and there is an urgent need to the metals with higher intensity as Aircraft Structure Materials.TB8 titanium alloy is as a kind of
The imitated high strength titanium alloy in China, just has many experts and scholars to grind the strengthening mechanism of the alloy from being born certainly
Study carefully, to obtain higher intensity by process optimization.
Research for TB8 titanium alloy specifically includes that
Authorization Notice No. is CN105648375B, and entitled " a kind of to improve the superplastic method of metastable state beta-titanium alloy " invention is special
Benefit is the currently unique patent for TB8 titanium alloy that can retrieve, and the patent is by temperature being 440 to TB8 titanium alloy
The Pre-aging treatment of DEG C of -545 DEG C progress 20min-70min, increases the superplasticity of TB8 titanium alloy.Regrettably, this patent
It is not directed to the reinforcement process of TB8 titanium alloy.
2010, Zhang Lijun et al. delivered entitled " the strong titanium conjunction of TB8 superelevation in China YouSe Acta Metallurgica Sinica album 1 of volume 20
Gold heat treatment process " article.This article has studied influence of the heat treating regime to TB8 titanium alloy mechanical property, discovery: alloy
After 520 DEG C of timeliness, it can get tensile strength and be greater than 1300 MPa, elongation percentage is greater than 5% excellent properties.This article passes through technique
Regulation relies on precipitation strength mechanism to obtain the high intensity of TB8.
2016, Zhao Wenlong et al. delivered that entitled " TB8 titanium alloy strain ageing is strong in heat processing technique the 2nd phase of volume 45
Change analysis " article.This article has studied predeformation+aging technique to the remarkable effect for promoting TB8 titanium alloy intensity.Predeformation can
Cause processing hardening, it is that timeliness α phase provides a large amount of nucleation point that furthermore predeformation, which is formed by dislocation, strong so as to cause being precipitated
Change the promotion of effect, therefore TB8 titanium alloy can be obtained finally higher than 1400 MPa tensile strength.This article by introduce processing hardening+
Ageing strengthening mechanism obtains the further promotion of TB8 titanium alloy intensity.
It is well known, however, that metal material also includes other than intrinsic solution strengthening effect there are four types of strengthening mechanism
Refined crystalline strengthening, processing hardening, precipitation strength.Above-mentioned document is based on solid solution+ageing strengthening or solid solution+processing hardening+ageing strengthening
Mechanism realizes the high intensity of TB8 titanium alloy, but has ignored the effect of refined crystalline strengthening mechanism.It may conclude that TB8 titanium alloy is potential
Intensity " limit " not be effectively played, which greatly limits the alloy aviation field application.Therefore, lead to
It crosses and introduces more scientific composite reinforcement process, realize further riseing for TB8 titanium alloy intensity, it is highly reliable for promoting China
Property space shuttle development and application be of great significance.
Summary of the invention
The present invention designs a kind of composite reinforcement process of TB8 titanium alloy, which includes predeformation, at heat
It is strong can to give full play to solution strengthening, refined crystalline strengthening, processing hardening and four kinds of precipitation strength for reason, eventually deformation and four step of ageing treatment
The synergistic effect of change mechanism through TB8 titanium alloy obtained by composite reinforcement process there are 1500 MPa(to be even higher than 1600
MPa the tensile strength more than).
The present invention provides a kind of composite reinforcement process of superhigh intensity TB8 titanium alloy, include the following steps: in order to obtain
Target material, original solid solution state TB8 titanium alloy blank need the total deformation of 70%-90%, are defined asX；XAnd non-once is complete
At, but need to deform two stages by predeformation and eventually, if predeformation amount isX 0 , whole deflection isX f , thenX=X 0 +X f .It takesX 0 For 60%-80%,X f It is 10%(relative to original blank).It is to be noted that being recrystallized between predeformation and eventually deformation
Heat treatment carries out ageing treatment after deformation eventually.
Specific steps and strengthening principle are as follows: (1) TB8 titanium alloy blank undergoes predeformationX 0 , after 15 DEG C more than beta transformation point
(i.e. Tβ+ 15 DEG C) heat preservation 5min is air-cooled, it is therefore an objective to promote Deformation structure to be recrystallized into for tiny equiax crystal, passes through the control time
Guarantee not cause crystal grain to be grown up while recrystallization is completed, to play refined crystalline strengthening effect.
(2) whole deformation is carried outX f , a large amount of dislocations are introduced in fine grained texture, play the effect of processing hardening.
(3) ageing treatment is carried out.Timeliness can take two ways, i.e. single-stage aging or two-stage time effect.Single-stage aging work
Skill is 520 DEG C -540 DEG C/8h, air-cooled；Two-stage time effect process is 300 DEG C -350 DEG C/2h, air-cooled, 520 DEG C -560 DEG C/8h, empty
It is cold.A large amount of tiny acicular α phases are precipitated in transgranular dislocation and grain boundaries by timeliness, play the effect of precipitation strength.
Sampling carries out tensile property test.
The step of above-mentioned composite reinforcement process, is specifically described below:
The detailed process of step (1) are as follows:
1. predeformation process are as follows: carry out predeformation, predeformation amount to original plate using two-roller millX 0 For 60%-80%, single track
Secondary deflection is 5%, and roll linear velocity is 0.15 m/s；2. predeformation plate is put into the batch-type furnace inside holding 5 that temperature is 815 DEG C
It is taken out after min air-cooled.
The detailed process of step (2) are as follows:
It is air-cooled to plate finish to gauge, whole deflection after room temperatureX f It is 10%, control single pass heavy deformation is 2%, and roll linear velocity is
0.15m/s。
Beneficial effects of the present invention: the composite reinforcement process of acquisition superhigh intensity TB8 titanium alloy proposed by the invention can
Solution strengthening, refined crystalline strengthening, the synergistic effect of four kinds of strengthening mechanisms of processing hardening and precipitation strength are given full play to, it is obtained
TB8 titanium alloy can get 1500 MPa(be even higher than 1600 MPa) more than tensile strength, can be improved by force compared with common heat treatment
Spend 200 MPa or more.The composite reinforcement process process is simple, and significant effect has a extensive future.
Detailed description of the invention
Fig. 1 is composite reinforcement process flow chart；
Fig. 2 is original solid solution state tissue topography；
Fig. 3 is original solid solution state tensile property；
Fig. 4 is 1 tensile property of embodiment；
Fig. 5 is that example 1 group knits pattern；
Fig. 6 is 2 tensile property of embodiment；
Fig. 7 is 2 tissue topography of embodiment；
Fig. 8 is 3 tensile property of embodiment；
Fig. 9 is 3 tissue topography of embodiment；
Figure 10 is 4 tensile property of embodiment；
Figure 11 is 4 tissue topography of embodiment；
Figure 12 is 5 tensile property of embodiment；
Figure 13 is 5 tissue topography of embodiment；
Figure 14 is the schematic illustration of tissue under the conditions of composite reinforcement process.
Specific embodiment
The present invention is further illustrated below by embodiment, but is not limited to following embodiment.
Embodiment 1:
Process route shown in 1 with reference to the accompanying drawings, it is original that the solid solution state TB8 titanium alloy sheet with a thickness of 10 mm is taken in the present embodiment
Blank, microscopic structure are rendered as single β phase of the average grain size at 70 μm or so, as shown in Fig. 2.It 3 draws with reference to the accompanying drawings
Curve is stretched, tensile strength is lower, only 766 MPa.Predeformation (predeformation amount is carried out to original plate using two-roller millX 0
For 80%), single pass heavy deformation 5%, roll linear velocity is 0.15 m/s, 2 mm thickness is deformed into after multi-pass cold rolling.It will be pre-
It is air-cooled to take out after 815 DEG C of 5 min of batch-type furnace inside holding that deformed plate is put into temperature.It is air-cooled to plate finish to gauge after room temperature (eventually
DeflectionX f For 10%), control single pass heavy deformation is 2%, roll linear velocity is 0.15 m/s, is finally deformed into 1 mm thickness.It will
Material after finish to gauge carries out single-stage aging, technique are as follows: 540 DEG C/8h, be air-cooled to room temperature.So far, the composite reinforcement process process is complete
Portion terminates.
It is the plate type tensile specimen of the mm × 1 of 10 mm × 3 mm that gauge length section is taken from the TB8 titanium alloy after reinforcing.Test
Before, sample outer surface needs sanding and polishing, and test speed is set as 2 × 10-3 s-1.Attached drawing 4 is stress strain curve, measures tensile strength
For 1506 MPa.Metallographic specimen is separately taken from the material after reinforcing, is corroded after grinding and polishing using Kroll reagent, and optics is then used
Microscope observes tissue, sees attached drawing 5.Attached drawing 5 is analyzed it can be found that TB8 titanium alloy is average after composite reinforcement process is handled
Crystallite dimension 70 μm or so of state is reduced to more than ten μm or so by original solid solution, and transgranular throughout dislocation and acicular α phase, this is
Alloy obtains high-intensitive immediate cause under the technique.
Embodiment 2
Process route shown in 1 with reference to the accompanying drawings, it is original that the solid solution state TB8 titanium alloy sheet with a thickness of 10 mm is taken in the present embodiment
Blank, tissue and performance are the same as embodiment 1.Predeformation (predeformation amount is carried out to original plate using two-roller millX 0 For 80%),
Single pass heavy deformation is 5%, and roll linear velocity is 0.15 m/s, and 2 mm thickness is deformed into after multi-pass cold rolling.Predeformation plate is put
It is air-cooled to take out after 815 DEG C of 5 min of batch-type furnace inside holding to enter temperature.It is air-cooled to plate finish to gauge (whole deflection after room temperatureX f
For 10%), control single pass heavy deformation is 2%, roll linear velocity is 0.15 m/s, is finally deformed into 1 mm thickness.After finish to gauge
Material carries out two-stage time effect, technique are as follows: 350 DEG C/2h, be air-cooled to room temperature, 540 DEG C/8h, be air-cooled to room temperature.So far, this is compound strong
Changing process flow all terminates.
It is the plate type tensile specimen of the mm × 1 of 10 mm × 3 mm that gauge length section is taken from the TB8 titanium alloy after reinforcing.Test
Before, sample outer surface needs sanding and polishing, and test speed is set as 2 × 10-3 s-1.Attached drawing 6 is stress strain curve, measures tensile strength
For 1611 MPa.Metallographic specimen is separately taken from the material after reinforcing, is corroded after grinding and polishing using Kroll reagent, and optics is then used
Microscope observes tissue, sees attached drawing 7.Attached drawing 7 is analyzed it can be found that TB8 titanium alloy is average after composite reinforcement process is handled
Crystallite dimension 70 μm or so of state is reduced to more than ten μm or so by original solid solution, and transgranular throughout dislocation and acicular α phase, this is
Alloy obtains high-intensitive immediate cause under the technique.
Embodiment 3
Process route shown in 1 with reference to the accompanying drawings, it is original that the solid solution state TB8 titanium alloy sheet with a thickness of 10 mm is taken in the present embodiment
Blank, tissue and performance are the same as embodiment 1.Predeformation (predeformation amount is carried out to original plate using two-roller millX 0 For 80%),
Single pass heavy deformation is 5%, and roll linear velocity is 0.15 m/s, and 2 mm thickness is deformed into after multi-pass cold rolling.Predeformation plate is put
It is air-cooled to take out after 815 DEG C of 5 min of batch-type furnace inside holding to enter temperature.It is air-cooled to plate finish to gauge (whole deflection after room temperatureX f
For 10%), control single pass heavy deformation is 2%, roll linear velocity is 0.15 m/s, is finally deformed into 1 mm thickness.After finish to gauge
Material carries out two-stage time effect, technique are as follows: 300 DEG C/2h, be air-cooled to room temperature, 520 DEG C/8h, be air-cooled to room temperature.So far, this is compound strong
Changing process flow all terminates.
It is the plate type tensile specimen of the mm × 1 of 10 mm × 3 mm that gauge length section is taken from the TB8 titanium alloy after reinforcing.Test
Before, sample outer surface needs sanding and polishing, and test speed is set as 2 × 10-3 s-1.Attached drawing 8 is stress strain curve, measures tensile strength
For 1594 MPa.Metallographic specimen is separately taken from the material after reinforcing, is corroded after grinding and polishing using Kroll reagent, and optics is then used
Microscope observes tissue, sees attached drawing 9.Attached drawing 9 is analyzed it can be found that TB8 titanium alloy is average after composite reinforcement process is handled
Crystallite dimension 70 μm or so of state is reduced to more than ten μm or so by original solid solution, and transgranular throughout dislocation and acicular α phase, this is
Alloy obtains high-intensitive immediate cause under the technique.
Embodiment 4
Process route shown in 1 with reference to the accompanying drawings, it is original that the solid solution state TB8 titanium alloy sheet with a thickness of 10 mm is taken in the present embodiment
Blank, tissue and performance are the same as embodiment 1.Predeformation (predeformation amount is carried out to original plate using two-roller millX 0 For 80%),
Single pass heavy deformation is 5%, and roll linear velocity is 0.15 m/s, and 2 mm thickness is deformed into after multi-pass cold rolling.Predeformation plate is put
It is air-cooled to take out after 815 DEG C of 5 min of batch-type furnace inside holding to enter temperature.It is air-cooled to plate finish to gauge (whole deflection after room temperatureX f
For 10%), control single pass heavy deformation is 2%, roll linear velocity is 0.15 m/s, is finally deformed into 1 mm thickness.After finish to gauge
Material carries out single-stage aging, technique are as follows: 520 DEG C/8h, be air-cooled to room temperature.So far, which all terminates.
It is the plate type tensile specimen of the mm × 1 of 10 mm × 3 mm that gauge length section is taken from the TB8 titanium alloy after reinforcing.Test
Before, sample outer surface needs sanding and polishing, and test speed is set as 2 × 10-3 s-1.Attached drawing 10 is stress strain curve, and it is strong to measure tension
Degree is 1624 MPa.Metallographic specimen is separately taken from the material after reinforcing, is corroded after grinding and polishing using Kroll reagent, and light is then used
It learns microscope and observes tissue, see attached drawing 11.Attached drawing 11 is analyzed it can be found that after composite reinforcement process is handled, TB8 titanium alloy
Average grain size 70 μm or so of state is reduced to more than ten μm or so by original solid solution, and transgranular throughout dislocation and acicular α phase,
This is that alloy obtains high-intensitive immediate cause under the technique.
Embodiment 5
Process route shown in 1 with reference to the accompanying drawings, it is original that the solid solution state TB8 titanium alloy sheet with a thickness of 10 mm is taken in the present embodiment
Blank, tissue and performance are the same as embodiment 1.Predeformation (predeformation amount is carried out to original plate using two-roller millX 0 For 80%),
Single pass heavy deformation is 5%, and roll linear velocity is 0.15 m/s, and 2 mm thickness is deformed into after multi-pass cold rolling.Predeformation plate is put
It is air-cooled to take out after 815 DEG C of 5 min of batch-type furnace inside holding to enter temperature.It is air-cooled to plate finish to gauge (whole deflection after room temperatureX f
For 10%), control single pass heavy deformation is 2%, roll linear velocity is 0.15 m/s, is finally deformed into 1 mm thickness.After finish to gauge
Material carries out two-stage time effect, technique are as follows: 330 DEG C/2h, be air-cooled to room temperature, 560 DEG C/8h, be air-cooled to room temperature.So far, this is compound strong
Changing process flow all terminates.
It is the plate type tensile specimen of the mm × 1 of 10 mm × 3 mm that gauge length section is taken from the TB8 titanium alloy after reinforcing.Test
Before, sample outer surface needs sanding and polishing, and test speed is set as 2 × 10-3 s-1.Attached drawing 12 is stress strain curve, and it is strong to measure tension
Degree is 1501 MPa.Metallographic specimen is separately taken from the material after reinforcing, is corroded after grinding and polishing using Kroll reagent, and light is then used
It learns microscope and observes tissue, see attached drawing 13.Attached drawing 13 is analyzed it can be found that after composite reinforcement process is handled, TB8 titanium alloy
Average grain size 70 μm or so of state is reduced to more than ten μm or so by original solid solution, and transgranular throughout dislocation and acicular α phase,
This is that alloy obtains high-intensitive immediate cause under the technique.
Organization decided performance, composite reinforcement process can get multiple strengthening effect by changing tissue topography.In order to help
It is understood that attached drawing 14 show the schematic illustration of tissue under the conditions of composite reinforcement process.As seen from the figure, original big crystal grain is by multiple
After closing reinforcement process processing, it is changed into inside small grains the acicular α phase rich in dislocation and precipitation, TB8 titanium alloy itself is consolidated
Analysis of the molten strengthening effect with refined crystalline strengthening effect, the work-hardening effect of dislocation and acicular α phase caused by composite reinforcement process
Strengthening effect collective effect out, it is final to realize high intensity.
Claims (6)
1. a kind of composite reinforcement process of superhigh intensity TB8 titanium alloy, it is characterised in that: through obtained by composite reinforcement process
TB8 titanium alloy has the tensile strength of 1500 MPa or more.
2. the composite reinforcement process of superhigh intensity TB8 titanium alloy according to claim 1, it is characterised in that: including as follows
Step: original solid solution state TB8 titanium alloy blank needs the total deformation of 70%-90%, is defined asX；XAnd non-once is completed, and
It is to need to deform two stages by predeformation and eventually, if predeformation amount isX 0 , whole deflection isX f , thenX=X 0 +X f ；It takesX 0 For
60%-80%,X f It is 10%, the percent deformation relative to original blank；It should be carried out at heat between predeformation and eventually deformation
Reason carries out ageing treatment after deformation eventually.
3. the composite reinforcement process of superhigh intensity TB8 titanium alloy according to claim 2, it is characterised in that: specific steps
Are as follows: (1) TB8 titanium alloy blank undergoes predeformationX 0 , after 15 DEG C of heat preservation 5min are air-cooled more than beta transformation point, it is therefore an objective to promote to become
Shape tissue is recrystallized into as tiny equiax crystal, does not cause crystal grain to be grown up while guaranteeing that recrystallization is completed by the control time,
To play refined crystalline strengthening effect；
(2) whole deformation is carried outX f , a large amount of dislocations are introduced in fine grained texture, play the effect of processing hardening；
(3) carry out ageing treatment: timeliness takes two ways, i.e. single-stage aging or two-stage time effect；By timeliness in transgranular dislocation
And a large amount of tiny acicular α phases are precipitated in grain boundaries, play the effect of precipitation strength.
4. the composite reinforcement process of superhigh intensity TB8 titanium alloy according to claim 3, it is characterised in that: step (1)
Detailed process are as follows:
1. predeformation process are as follows: carry out predeformation, predeformation amount to original plate using two-roller millX 0 For 60%-80%, single pass
Deflection is 5%, and roll linear velocity is 0.15 m/s；2. predeformation plate is put into the batch-type furnace inside holding 5 that temperature is 815 DEG C
It is taken out after min air-cooled.
5. the composite reinforcement process of superhigh intensity TB8 titanium alloy according to claim 3, it is characterised in that: step (2)
Detailed process are as follows:
It is air-cooled to plate finish to gauge, whole deflection after room temperatureX f It is 10%, control single pass heavy deformation is 2%, and roll linear velocity is
0.15 m/s。
6. the composite reinforcement process of superhigh intensity TB8 titanium alloy according to claim 3, it is characterised in that: single-stage aging
Technique is 520 DEG C -540 DEG C/8h, air-cooled；Two-stage time effect process is 300 DEG C -350 DEG C/2h, air-cooled, 520 DEG C -560 DEG C/8h, empty
It is cold.
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| CN114346141A (en) * | 2022-01-17 | 2022-04-15 | 太原理工大学 | Multi-section hot working method for preparing weak alpha texture titanium alloy forging |
| CN114507833A (en) * | 2022-03-10 | 2022-05-17 | 贵州大学 | TB8 titanium alloy bar with gradient layer alpha-phase structure and preparation method thereof |
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| CN114507833A (en) * | 2022-03-10 | 2022-05-17 | 贵州大学 | TB8 titanium alloy bar with gradient layer alpha-phase structure and preparation method thereof |
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