CN110306139A - A kind of continuous steps hot stressing technique improving TC4 titanium alloy temperature-room type plasticity - Google Patents
A kind of continuous steps hot stressing technique improving TC4 titanium alloy temperature-room type plasticity Download PDFInfo
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- CN110306139A CN110306139A CN201910742808.XA CN201910742808A CN110306139A CN 110306139 A CN110306139 A CN 110306139A CN 201910742808 A CN201910742808 A CN 201910742808A CN 110306139 A CN110306139 A CN 110306139A
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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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Abstract
The invention discloses a kind of continuous steps hot stressing techniques for improving TC4 titanium alloy temperature-room type plasticity, it is to be surface-treated first to TC4 titanium alloy sample, then sample is heated to charging temperature under vacuum conditions, continuous steps are filled with hydrogen again, at least heat preservation to hydrogen presses stabilization after every step is flushed with hydrogen, final step is air-cooled to room temperature after being flushed with hydrogen, that is, completes the raising to TC4 titanium alloy temperature-room type plasticity.Of the invention method is simple, cost is relatively low and plasticization effect is obvious, and treated, and TC4 titanium alloy temperature-room type plasticity significantly improves, this is conducive to the temperature-room type plasticity forming of TC4 alloy complex structural member, can expand the application range of TC4 titanium alloy.
Description
Technical field
The invention belongs to titanium alloy material process fields, and in particular to a kind of titanium alloy heat treatment process.
Background technique
Currently, titanium alloy is due to specific strength is high, high temperature resistance is good, good corrosion resistance, nonmagnetic etc. a series of excellent
It is anisotropic can and be widely used in the fields such as Aeronautics and Astronautics.TC4 titanium alloy is a kind of alpha and beta titanium alloy, is had good comprehensive
Can, it is a kind of most commonly used titanium alloy of current domestic and international application.But the plasticity of TC4 titanium alloy at room temperature is low, deformation limit
It is easy to crack when low, cold forming, limit the forming of its temperature-room type plasticity.At present major part titanium alloy need to carry out at high temperature plasticity at
Shape.Although Plastic Forming performance is good at high temperature for titanium alloy, high temperature also brings a series of problems to forming: deformation temperature
It is high, flow stress is big, microstructure and performance are difficult to control, mold and former are required high.In addition, high temperature is to former material
The protection of material, system and technique is also highly difficult.
In recent years, hot stressing technology is widely applied in the microstructure and property for improving titanium alloy.Hot stressing
Technology is to cause phase transformation and hydrogen in the reversible alloy of titanium alloy using hydrogen deduced plasticity, hydrogen using hydrogen as a kind of interim alloying element
It is turned into room temperature texture, mechanical property and the processing performance etc. for improving titanium alloy.It is finally reversible in titanium alloy according to hydrogen
Alloying action, using the hydrogen in the method removal alloy of vacuum annealing, to prevent it from hydrogen embrittlement occurring in use.
Currently, the hydrogen treatment process for improving titanium alloy temperature-room type plasticity is complex, existing raising titanium alloy temperature-room type plasticity
Hot stressing technique be usually set hydrogen processing to titanium alloy sample first, then hydrogenated titanium alloy sample is consolidated again
Molten quenching treatment, to the preferable β phase of plasticity be retained to room temperature, to improve its temperature-room type plasticity.But titanium alloy is at high temperature
It is oxidizable, and there is hydrogen escape phenomenon at high temperature in hydrogenated titanium alloy.Therefore, solution hardening is being carried out to hydrogenated titanium alloy sample
When processing, need for hydrogenated titanium alloy sample Vacuum Package in quartz ampoule, to be just avoided that hydrogenated titanium alloy sample oxidation and
The escape of a large amount of hydrogen.But volume and the biggish hydrogenated titanium alloy sample of quality, Vacuum Package and solution hardening are handled
Difficulty it is larger.
Summary of the invention
For the complexity of the existing hot stressing technique for improving titanium alloy temperature-room type plasticity, the present invention is intended to provide one kind mentions
The continuous steps hot stressing technique of high TC4 titanium alloy temperature-room type plasticity, to can be by more easy-to-use mode effectively
Improve the temperature-room type plasticity of TC4 titanium alloy.
The present invention is to realize goal of the invention, is adopted the following technical scheme that
A kind of continuous steps hot stressing technique improving TC4 titanium alloy temperature-room type plasticity, it is characterized in that: first to TC4
Titanium alloy sample is surface-treated, sample is then heated to charging temperature under vacuum conditions, then continuous steps are filled with
Hydrogen, at least heat preservation to hydrogen presses stabilization after every step is flushed with hydrogen, and final step is air-cooled to room temperature after being flushed with hydrogen, that is, completes to TC4 titanium alloy
The raising of temperature-room type plasticity.Specifically comprise the following steps:
Step 1, TC4 titanium alloy sample carry out ultrasonic cleaning in dehydrated alcohol, then dry up after sand paper is polished,
Guarantee that specimen surface is pollution-free；
Sample is put into the boiler tube of tube furnace by step 2, is opened vacuum system, will be vacuumized in boiler tube；It starts to warm up,
The vacuum valve of vacuum system is closed when temperature rises to charging temperature；
Step 3 is filled with hydrogen into boiler tube, and at least heat preservation to hydrogen pressure in boiler tube is stablized, and the step number that is flushed with hydrogen at this time is denoted as 1
Step；
After step 4, previous step heat preservation, hydrogen is filled with into boiler tube again, and at least heat preservation is steady to hydrogen pressure in boiler tube
It is fixed, it is flushed with hydrogen step number+1；
Step 5 repeats step 4, until being flushed with hydrogen step number needed for reaching；
Step 6, after being flushed with hydrogen, sample is air-cooled to room temperature, takes out, that is, completes raising to TC4 titanium alloy temperature-room type plasticity.
Further, in step 2, described vacuumize is to be evacuated to vacuum degree in boiler tube to be lower than 1.5 × 10-3Pa。
Further, in step 2, the charging temperature is 750-850 DEG C, and heating rate is 10 DEG C/min.
Further, in step 3, being filled with hydrogen pressure in hydrogen to boiler tube is -0.08MPa, soaking time 1h.
Further, in step 4, every step is filled with the hydrogen of 0.008MPa, soaking time 1h.
Further, in step 5, step number is flushed with hydrogen needed for described as 4-12 step.
Compared with the prior art, the beneficial effects of the present invention are embodied in:
1, the invention proposes a kind of continuous steps hot stressing techniques, increase the volume point of TC4 titanium alloy Plastic phase
Number, retains more β phases to room temperature, it will be apparent that the temperature-room type plasticity for improving TC4 titanium alloy is conducive to TC4 alloy complex
The temperature-room type plasticity of structural member shapes, and can expand the application range of TC4 titanium alloy.
2, method of the invention need not carry out solution hardening processing, avoid hydrogenated titanium alloy sample Vacuum Package in stone
In English pipe, the difficulty of titanium alloy hot stressing technique can be reduced, this is for volume and the biggish titanium alloy sample of quality
It is particularly evident；The present invention reduces the investments of Vacuum Package processing link and sealed in unit, improve efficiency, reduce costs,
And this method is simple and easy to do, has good application and popularization value.
Specific embodiment
Embodiment related to the present invention is illustrated below by embodiment, is merely illustrative of the invention
The limited cases of embodiment, do not limit the scope of the invention.
Embodiment 1
Step 1, TC4 titanium alloy sample carry out ultrasonic cleaning in dehydrated alcohol, then dry up after sand paper is polished,
Guarantee that specimen surface is pollution-free；
Sample is put into the boiler tube of tube furnace by step 2, is opened vacuum system, is evacuated to vacuum degree in boiler tube and is lower than
1.5×10-3Pa；Start to heat up with the rate of 10 DEG C/min, the vacuum valve at vacuum system end is closed when temperature rises to 750 DEG C
Door；
Step 3 is filled with hydrogen into boiler tube to -0.08MPa, keeps the temperature 1 hour, the step number that is flushed with hydrogen at this time is denoted as 1 step；
After step 4, previous step heat preservation, hydrogen is filled with into boiler tube again, this step is filled with the hydrogen of 0.008MPa, protects
Temperature 1 hour, is flushed with hydrogen step number+1；
Step 5 repeats step 4, until being flushed with hydrogen step number is 8 steps；
Step 6, after being flushed with hydrogen, sample is air-cooled to room temperature, takes out sample, and plasticity index testing result is shown in Table 1.
Embodiment 2
Step 1, TC4 titanium alloy sample carry out ultrasonic cleaning in dehydrated alcohol, then dry up after sand paper is polished,
Guarantee that specimen surface is pollution-free；
Sample is put into the boiler tube of tube furnace by step 2, is opened vacuum system, is evacuated to vacuum degree in boiler tube and is lower than
1.5×10-3Pa；Start to heat up with the rate of 10 DEG C/min, the vacuum valve at vacuum system end is closed when temperature rises to 800 DEG C
Door；
Step 3 is filled with hydrogen into boiler tube to -0.08MPa, keeps the temperature 1 hour, the step number that is flushed with hydrogen at this time is denoted as 1 step；
After step 4, previous step heat preservation, hydrogen is filled with into boiler tube again, this step is filled with the hydrogen of 0.008MPa, protects
Temperature 1 hour, is flushed with hydrogen step number+1；
Step 5 repeats step 4, until being flushed with hydrogen step number is 4 steps；
Step 6, after being flushed with hydrogen, sample is air-cooled to room temperature, takes out sample, and plasticity index testing result is shown in Table 1.
Embodiment 3
Step 1, TC4 titanium alloy sample carry out ultrasonic cleaning in dehydrated alcohol, then dry up after sand paper is polished,
Guarantee that specimen surface is pollution-free；
Sample is put into the boiler tube of tube furnace by step 2, is opened vacuum system, is evacuated to vacuum degree in boiler tube and is lower than
1.5×10-3Pa；Start to heat up with the rate of 10 DEG C/min, the vacuum valve at vacuum system end is closed when temperature rises to 850 DEG C
Door；
Step 3 is filled with hydrogen into boiler tube to -0.08MPa, keeps the temperature 1 hour, the step number that is flushed with hydrogen at this time is denoted as 1 step；
After step 4, previous step heat preservation, hydrogen is filled with into boiler tube again, this step is filled with the hydrogen of 0.008MPa, protects
Temperature 1 hour, is flushed with hydrogen step number+1；
Step 5 repeats step 4, until being flushed with hydrogen step number is 11 steps；
Step 6, after being flushed with hydrogen, sample is air-cooled to room temperature, takes out sample, and plasticity index testing result is shown in Table 1.
Table 1 is original and temperature-room type plasticity Indexs measure of the TC4 titanium alloy after different continuous steps hot stressing process
As a result
| Sample | Ultimate deformation/% | Amplitude/the % improved compared with original sample |
| It is original | 17.16 | / |
| Embodiment 1 | 23.88 | 39.16 |
| Embodiment 2 | 27.59 | 60.78 |
| Embodiment 3 | 34.07 | 98.54 |
Note: room temperature compression experiment carries out in MTS Landmark type equipment, compression speed 0.5mm/min.
The foregoing is merely exemplary embodiment of the present invention, are not intended to limit the invention, all of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within spirit and principle.
Claims (7)
1. a kind of continuous steps hot stressing technique for improving TC4 titanium alloy temperature-room type plasticity, it is characterised in that: first to TC4 titanium
Alloy sample is surface-treated, sample is then heated to charging temperature under vacuum conditions, then continuous steps are filled with hydrogen
Gas, at least heat preservation to hydrogen presses stabilization after every step is flushed with hydrogen, and final step is air-cooled to room temperature after being flushed with hydrogen, that is, completes to TC4 titanium alloy room
The raising of warm plasticity.
2. continuous steps hot stressing technique according to claim 1, which comprises the steps of:
Step 1, TC4 titanium alloy sample carry out ultrasonic cleaning in dehydrated alcohol, then dry up after sand paper is polished, and guarantee
Specimen surface is pollution-free；
Sample is put into the boiler tube of tube furnace by step 2, is opened vacuum system, will be vacuumized in boiler tube；It starts to warm up, works as temperature
Degree closes the vacuum valve of vacuum system when rising to charging temperature；
Step 3 is filled with hydrogen into boiler tube, and at least heat preservation to hydrogen pressure in boiler tube is stablized, and the step number that is flushed with hydrogen at this time is denoted as 1 step；
After step 4, previous step heat preservation, hydrogen is filled with into boiler tube again, and at least heat preservation to hydrogen pressure in boiler tube is stablized, and fills
Hydrogen step number+1；
Step 5 repeats step 4, until being flushed with hydrogen step number needed for reaching；
Step 6, after being flushed with hydrogen, sample is air-cooled to room temperature, takes out, that is, completes raising to TC4 titanium alloy temperature-room type plasticity.
3. continuous steps hot stressing technique according to claim 2, it is characterised in that: in step 2, described vacuumize is
It is evacuated to vacuum degree in boiler tube and is lower than 1.5 × 10-3Pa。
4. continuous steps hot stressing technique according to claim 2, it is characterised in that: in step 2, described is flushed with hydrogen temperature
Degree is 750-850 DEG C, and heating rate is 10 DEG C/min.
5. continuous steps hot stressing technique according to claim 2, it is characterised in that: in step 3, be filled with hydrogen to furnace
Hydrogen pressure is -0.08MPa, soaking time 1h in managing.
6. continuous steps hot stressing technique according to claim 2, it is characterised in that: in step 4, every step is filled with
The hydrogen of 0.008MPa, soaking time 1h.
7. continuous steps hot stressing technique according to claim 2, it is characterised in that: in step 5, filled needed for described
Hydrogen step number is 4-12 step.
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Cited By (3)
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| CN113621905A (en) * | 2021-08-25 | 2021-11-09 | 合肥工业大学 | Thermal hydrogen treatment process for improving softening effect of TC21 titanium alloy in room-temperature plastic deformation process |
| CN114635099A (en) * | 2022-03-23 | 2022-06-17 | 合肥工业大学 | Continuous multi-step thermal hydrogen treatment process for optimizing TC21 titanium alloy microstructure |
| CN115505861A (en) * | 2022-10-25 | 2022-12-23 | 西安建筑科技大学 | Preparation method of fine-grain titanium alloy for superplastic forming |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113621905A (en) * | 2021-08-25 | 2021-11-09 | 合肥工业大学 | Thermal hydrogen treatment process for improving softening effect of TC21 titanium alloy in room-temperature plastic deformation process |
| CN114635099A (en) * | 2022-03-23 | 2022-06-17 | 合肥工业大学 | Continuous multi-step thermal hydrogen treatment process for optimizing TC21 titanium alloy microstructure |
| CN115505861A (en) * | 2022-10-25 | 2022-12-23 | 西安建筑科技大学 | Preparation method of fine-grain titanium alloy for superplastic forming |
| CN115505861B (en) * | 2022-10-25 | 2023-03-03 | 西安建筑科技大学 | Preparation method of fine-grain titanium alloy for superplastic forming |
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