CN107604281B - A method of improving TC4 titanium alloy plate low temperature superplasticity - Google Patents
A method of improving TC4 titanium alloy plate low temperature superplasticity Download PDFInfo
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- CN107604281B CN107604281B CN201710842702.8A CN201710842702A CN107604281B CN 107604281 B CN107604281 B CN 107604281B CN 201710842702 A CN201710842702 A CN 201710842702A CN 107604281 B CN107604281 B CN 107604281B
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Abstract
The invention discloses a kind of methods for improving TC4 titanium alloy plate low temperature superplasticity；Using TC4 titanium alloy plate as raw material, it is generous having a size of 35 × 30 × 25mm sample that length is processed by wire cutting method；Using mechanical grinding mode, the wire cutting trace of specimen surface is polished flat；Sample is put into chamber type electric resistance furnace and is heated to set temperature and keeps the temperature；Sample after heating in the enterprising line width of flat roll mill to the multi- pass rolling with thickness to both direction, exchange sample it is wide to thickness to specimen length direction is constant；Rolling finishes per pass, sample melts down be heated to set temperature and keep the temperature after, then carry out next passes；The plate for being about 3mm by multi- pass rolling to thickness.The invention has the advantages that plate preparation method is simple, no longer need to i.e. processable on common flat roll mill.Based on the above feature, this method is convenient to the preparation for Superplastic Titanium Alloys plate, and titanium alloy superplastic forming temperature is effectively reduced.
Description
Technical field
The present invention relates to a kind of preparation method for improving titanium alloy plate low temperature superplasticity performance, specially a kind of raisings
The method of TC4 titanium alloy plate low temperature superplasticity.
Background technique
Because it is significantly reduced, Deformation Resistance is big, can shape common process is difficult to shape titanium alloy Superplastic Forming Techniques
Complex component becomes the key technology of aerospace field titanium alloy near-net-shape, accurate thermoforming field, by domestic external-talent
The concern of material processing scientific worker.However, titanium alloy superplastic forming temperature generally between 900~930 DEG C [Han Kun etc.,
Rare metal, 2011,35 (4): 475-480], prolonged hot environment leads to that tool and mould failure is serious, production energy consumption is excessively high.
The study found that titanium alloy superplasticforming temperature can be reduced by refining titanium alloy crystallite dimension by severe plastic deformation
Degree improves superplasticforming speed.Researcher successively proposes Equal Channel Angular Pressing (ECAP), accumulation pack rolling (ARB), high pressure torsion
(HPT), the technologies such as multiway forging (MF).But since forming efficiency is not high, cannot prepare large-scale block materials, deformation is uneven or
The reasons such as uncontrollable are deformed, the application of the above method receives certain limitation.
Summary of the invention
It is brilliant by refinement on the flat roll mill that existing industrial circle is largely equipped that the purpose of the present invention is to provide a kind of
Grain changes the preparation method for improving titanium alloy plate low temperature superplasticity under the mechanism collective effects such as microstructure morphology.
The present invention takes following means: a method of improving TC4 titanium alloy plate low temperature superplasticity；It is characterized in that side
Steps are as follows for method:
(1) using the business TC4 titanium alloy plate with a thickness of 25mm as raw material, it is generous that length is processed by wire cutting method
Having a size of 35 × 30 × 25mm sample；
(2) mechanical grinding mode is used, the wire cutting trace of specimen surface is polished flat；
(3) sample is put into chamber type electric resistance furnace and is heated to set temperature (700 DEG C~750 DEG C) and keeps the temperature 5-10min；
(4) sample after heating to the multi- pass rolling with thickness to both direction, i.e., is often rolled in the enterprising line width of flat roll mill
Sample is rotated by 90 ° after a time processed, exchange sample it is wide to thickness to specimen length direction is constant；Rolling finishes per pass,
Sample melts down be heated to set temperature and keep the temperature after, then carry out next passes；By multi- pass rolling to having a size of L × 16
The rodlike blank of the length of × 16mm；
(5) the rodlike blank of length is rolled into the plate of thickness 3mm in single direction, rolling mill practice is same as above, and final pass is complete
Plate is quickly cooled down by Cheng Hou in cold water；
(6) in 700 DEG C/0.001s-1、800℃/0.001s-1With 800 DEG C/0.01s-1Under the conditions of, using constant strain rate
Loading method, tests its superplasticity property, and sample marking distance segment length is 5mm.
Step (3) set temperature of the present invention is 700 DEG C~750 DEG C.Heating and multi-pass at a lower temperature
Rolling, can significantly refine alpha phase crystallite dimension, cause beta phase completely broken and be in Dispersed precipitate, increase alpha/
The interface beta.In addition, the multi- pass rolling under low temperature significantly increases grain boundary dislocation density, be conducive to low temperature, high strain rate
Under the conditions of superplasticity property improvement.
Sample heating temperature is lower, is 700 DEG C~750 DEG C；Multi- pass rolling equipment is common flat roll mill, is easy real
Existing industrialized application；Using super under the conditions of the TC4 titanium alloy plate low temperature of low temperature multi- pass rolling preparation, high strain rate
Plasticity significantly improves.
The invention has the advantages that (1) low temperature superplasticity function admirable.Using one technique of embodiment, in 700 DEG C/0.001s-1、800℃/0.01s-1With 800 DEG C/0.001s-1Under the conditions of, sample elongation percentage respectively reaches 542%, 602% and 1550%；It adopts
With two technique of embodiment, under the same conditions, elongation percentage respectively reaches 505%, 566% and 1362%；(2) plate preparation method
Simply, it no longer needs to i.e. processable on common flat roll mill；(3) sample heating temperature is 700 DEG C~750 DEG C before rolling, and compares one
As rolling mill practice, temperature is substantially reduced, and reduces energy consumption.Based on the above feature, this method is convenient to for superplasticity titanium
Titanium alloy superplastic forming temperature is effectively reduced in the preparation of sheet alloy.
Specific embodiment
A method of improving TC4 titanium alloy plate low temperature superplasticity, it is characterised in that:
(1) under lower temperature (700 DEG C~750 DEG C), multi-pass large deformation rolling deformation is carried out to TC4 titanium alloy；
(2) multi-pass large deformation rolling deformation is in two steps: being in width first to the multi-pass with thickness to both direction
Sample is rotated by 90 ° after that is, every rolling a time by rolling, exchange the width of sample to thickness to specimen length direction is constant；Then
The rodlike blank of length is rolled into the plate of thickness 3mm in single direction；
(3) rolling deformation carries out on common flat roll mill, is not necessarily to special installation or significantly reforming equipment.To prevent
Sample tilts when rolling after spreading face injustice because of rolling sample is caused to be rotated by 90 °, and can increase guide plate in milling train side.
Embodiment one:
The large deformation rolling side of a kind of raising TC4 titanium alloy plate low temperature superplasticity according to embodiments of the present invention
Method includes the following steps:
Step 1: first TC4 titanium alloy specimen surface is polished flat；
Step 2: the sample after polishing is put into resistance furnace and is heated to 700 DEG C and keeps the temperature 10min；
Step 3: carrying out rolling deformation for the sample in step 2 on flat roll mill, wherein being both needed to before rolling per pass
The sample is put into resistance furnace and is heated to set temperature, is rotated by 90 ° sample after every rolling a time, the passage pressure of rolling
Amount is 10%-20%, until obtaining the rodlike blank of length that sectional dimension is about 16 × 16mm；
Step 4: by the rodlike blank of length that step 3 obtains 700 DEG C at a temperature of be rolling to the plate of 3mm thickness, roll
It is put into cold water and is quickly cooled down after the completion.
Embodiment two:
Step 1: TC4 titanium alloy sample is put into air-cooled after being added in resistance furnace to 1020 DEG C of heat preservation 60min；
Step 2: specimen surface oxide skin is removed, specimen surface is polished flat；
Step 2: the sample after polishing is put into resistance furnace and is heated to 750 DEG C and keeps the temperature 5min；
Step 3: carrying out rolling deformation for the sample in step 2 on flat roll mill, wherein being both needed to before rolling per pass
The sample is put into resistance furnace and is heated to set temperature, is rotated by 90 ° sample after every rolling a time, the passage pressure of rolling
Amount is 10%-20%, until obtaining the rodlike blank of length that sectional dimension is about 16 × 16mm；
Step 4: by the rodlike blank of length that step 3 obtains 750 DEG C at a temperature of be rolling to the plate of 3mm thickness, roll
It is put into cold water and is quickly cooled down after the completion.
Using the TC4 titanium alloy plate of embodiment one, two in 700 DEG C/0.001s-1、800℃/0.001s-1With 800 DEG C/
0.001s-1Under the conditions of, obtain excellent low temperature superplasticity performance.
Claims (2)
1. a kind of method for improving TC4 titanium alloy plate low temperature superplasticity；It is characterized in that method and step is as follows:
(1) using the business TC4 titanium alloy plate with a thickness of 25mm as raw material, long generous size is processed by wire cutting method
For 35 × 30 × 25mm sample；
(2) mechanical grinding mode is used, the wire cutting trace of specimen surface is polished flat；
(3) sample is put into chamber type electric resistance furnace and is heated to 700 DEG C~750 DEG C of set temperature and keeps the temperature 5-10min；
(4) sample after heating is in the enterprising line width of flat roll mill to the multi- pass rolling with thickness to both direction, i.e., every rolling one
Sample is rotated by 90 ° after passage, exchange sample it is wide to thickness to specimen length direction is constant；Rolling finishes per pass, sample
It melts down after being heated to set temperature and keeping the temperature, then carries out next passes；By multi- pass rolling to having a size of L × 16 ×
The rodlike blank of the length of 16mm；
(5) the rodlike blank of length is rolled into the plate of thickness 3mm in single direction, rolling mill practice is same as above, after the completion of final pass,
Plate is quickly cooled down in cold water；
(6) in 700 DEG C/0.001s-1、800℃/0.001s-1With 800 DEG C/0.01s-1Under the conditions of, it is loaded using constant strain rate
Mode, tests its superplasticity property, and sample marking distance segment length is 5mm.
2. a kind of method for improving TC4 titanium alloy plate low temperature superplasticity according to claim 1；It is characterized by: examination
Sample heating temperature is lower, is 700 DEG C~750 DEG C；Multi- pass rolling equipment is common flat roll mill, easy to accomplish industrialized
Using；It is significantly mentioned using the superplasticity under the conditions of the TC4 titanium alloy plate low temperature of low temperature multi- pass rolling preparation, high strain rate
It is high.
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2321674C2 (en) * | 2002-12-26 | 2008-04-10 | Дженерал Электрик Компани | Method for producing homogenous fine-grain titanium material (variants) |
| CN106507837B (en) * | 2004-12-27 | 2010-11-10 | 西北有色金属研究院 | A kind of Superplastic Titanium Alloys |
| CN100546732C (en) * | 2007-09-20 | 2009-10-07 | 上海桦厦实业有限公司 | The super plastic forming method of plate type heat converter special titanium plate |
| CN103785684B (en) * | 2014-01-24 | 2015-12-09 | 西部钛业有限责任公司 | A kind of preparation method of superplastic forming fine grain TA15 titanium-alloy thin-plate |
| CN103934301B (en) * | 2014-04-20 | 2016-03-23 | 西部钛业有限责任公司 | A kind of processing method of superplastic forming TC4 titanium alloy plate |
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