CN101648252B - Forging process for directionally solidifying titanium aluminum alloy blades - Google Patents
Forging process for directionally solidifying titanium aluminum alloy blades Download PDFInfo
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- CN101648252B CN101648252B CN2009103069597A CN200910306959A CN101648252B CN 101648252 B CN101648252 B CN 101648252B CN 2009103069597 A CN2009103069597 A CN 2009103069597A CN 200910306959 A CN200910306959 A CN 200910306959A CN 101648252 B CN101648252 B CN 101648252B
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- aluminum alloy
- titanium aluminum
- forging
- alloy blades
- directionally solidifying
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Abstract
The invention discloses a forging process for directionally solidifying titanium aluminum alloy blades, relating to a forging process of titanium aluminum alloy blades, and solving the problems that the prior forming method of directionally solidified titanium aluminum alloy blades is hard to form blades and has poor quality of the formed blades. The method comprises the following steps: determining the size of blade blanks; manufacturing forging mould by a high-temperature mould; coating a lubricant; placing the blank materials of the directionally solidified titanium aluminum alloy blades in an electric furnace under 900-1170 DEG C for two hours; placing the forging mould in the electric furnace to be heated and then rapidly taking out; placing the forging mould between two pads to be heated to 300-400 DEG C, rapidly folding the two pads and the forging mould on a pressing machine to be forged for 30-60 seconds; placing the forging mould in the electric furnace at 200-300 DEG C to be annealed for 15 minutes, and then obtaining the directionally solidified titanium aluminum alloy blades. The forging process is easy to form the directionally solidified titanium aluminum alloy blades so as to obtain the directionally solidified titanium aluminum alloy blades with better surface quality.
Description
Technical field
The present invention relates to a kind of Forging Technology of titanium aluminum alloy blades.
Background technology
Engine blade material preparation process technology is the key problem of Aero-Space development all the time.Along with the raising of aircraft performance, more and more higher to the thrust-weight ratio requirement of engine, and, be decided by the raising of Blade Properties to a great extent in order to improve the performance of engine.The development of modern technical aeronautics shows that the raising of Blade Properties need concur from material and technology of preparing two aspects.
The research that begins titanium aluminium (TiAl) alloy from the fifties in last century is exactly to be located to be middle high-temperature structural material.With intermetallic compound phase γ-TiAl and α
2-Ti
3A1 for the titanium aluminide on basis owing to have high-melting-point, low-density, high elastic modulus, low diffusion coefficient, good non-oxidizability and corrosion resistance and anti-flammability than the low emphasis that becomes people's research day by day of conventional titanium alloy.Further investigation through surplus 50 years, basic data becomes increasingly abundant, ratio elastic modelling quantity and specific strength in certain temperature range, the ratio elastic modelling quantity of TiAl alloy is higher than titanium alloy and nickel-base alloy, also be higher than the NiAl intermetallic compound, such characteristics can significantly increase the rigidity of TiAl alloy components, improve its stability.The specific strength of TiAl alloy has remarkable advantages in the 500-1200K scope, be higher than titanium alloy and polycrystalline nickel-base alloy, in addition can with monocrystal nickel-base alloy phase ratio.These advantages have determined the TiAl alloy to be very suitable for making moving component in all kinds of engines.The high specific strength of TiAl alloy, high anti-oxidant, creep resistant temperature make it become the preferred material of compressor blade.And the characteristics of directionally solidifying titanium aluminum alloy are: can make the direction of growth of crystal grain consistent with the loading direction of power, consequently improve the service life of blade greatly.
At present, the shaping for directionally solidifying titanium aluminum alloy blades mainly contains two kinds of methods: precision-investment casting and plastic deformation are shaped.The problem that precision-investment casting runs into for directionally solidifying titanium aluminum alloy mainly contains 3 points: one, ceramic die worsens metallurgical quality to the pollution of alloy material, though people are exploring the refractory material of new high chemical stability always, produces little effect; Two, the directionally solidifying titanium aluminum alloy solidification shrinkage makes and produces loose class defective in the blade, though it is loose to adopt hot isostatic pressing technique to eliminate, the distortion of high temperature insostatic pressing (HIP) rear blade is obvious; Three, the crystal boundary cracking is easy to occur in the directional solidification turbo blade, its reason is: on the one hand because the horizontal crystal boundary of directionally solidified superalloy, DS superalloy blade is a weak link, then be owing to need ceramic core during production directional solidification turbo blade on the other hand, melt again behind the casting solidification, because the thermal coefficient of expansion of ceramic core is littler than the thermal coefficient of expansion of directionally solidified superalloy, DS superalloy, thereby when cooling was shunk, core produced the radial stress effect on every side and causes the crystal boundary cracking.To sum up, the leaf quality of described precision-investment casting shaping is poor.Method for the directionally solidifying titanium aluminum alloy plastic deformation is come shaping blade, because directionally solidifying titanium aluminum alloy exists plasticity very low (plasticity under the room temperature≤0.7%), resistance of deformation height, narrow forging temperature, very strong anisotropic, to characteristics such as strain rate and stress state sensitivities, thereby bring very big difficulty for the forging and molding of directionally solidifying titanium aluminum alloy.
Summary of the invention
The blade that the objective of the invention is the to exist problem of difficulty and blade forming quality difference that is shaped for the manufacturing process that solves existing directionally solidifying titanium aluminum alloy blades, and then a kind of Forging Technology of directionally solidifying titanium aluminum alloy blades is provided.
The step of the Forging Technology of a kind of directionally solidifying titanium aluminum alloy blades of the present invention is:
Step 1: the size of determining the directionally solidifying titanium aluminum alloy blades blank;
Step 2: adopt hot-die steel to make forging mold, the die cavity of forging mold is consistent with the profile of directionally solidifying titanium aluminum alloy blades;
Step 3: lubricant is spread upon uniformly on the surface of directionally solidifying titanium aluminum alloy blades blank and on the surface of the die cavity of forging mold;
Step 4: the directionally solidifying titanium aluminum alloy blades blank is placed in the die cavity of forging mold, then matched moulds;
Step 5: it is heating 2 hours in 900～1170 ℃ the electric furnace that the forging mold behind the matched moulds is placed on temperature, takes out rapidly then;
Step 6: the forging mold that will take out rapidly is placed between two backing plates that are preheated to 300～400 ℃, is that quick-make is forged on the forcing press of 315～500t in nominal pressure, and forging time is 30～60 seconds;
Step 7: forge finish after, forging mold is placed in 200～300 ℃ the electric furnace and anneals, annealing time is 15 minutes, obtains directionally solidifying titanium aluminum alloy blades.
The present invention compared with prior art has following beneficial effect: Forging Technology of the present invention is taked is that the method for plastic deformation is come shaping blade.The method of taking to forge can be avoided the shortcoming of above-mentioned precision-investment casting blade.Forging Technology of the present invention has been formulated rational Forging Technology and subsequent heat treatment technology simultaneously, is easy to the shaping of directionally solidifying titanium aluminum alloy blades, has finally obtained surface quality directionally solidifying titanium aluminum alloy blades preferably.
The specific embodiment
The specific embodiment one: the step of the Forging Technology of a kind of directionally solidifying titanium aluminum alloy blades of present embodiment is:
Step 1: the size of determining the directionally solidifying titanium aluminum alloy blades blank;
Step 2: adopt hot-die steel to make forging mold, the die cavity of forging mold is consistent with the profile of directionally solidifying titanium aluminum alloy blades;
Step 3: lubricant is spread upon uniformly on the surface of directionally solidifying titanium aluminum alloy blades blank and on the surface of the die cavity of forging mold;
Step 4: the directionally solidifying titanium aluminum alloy blades blank is placed in the die cavity of forging mold, then matched moulds;
Step 5: it is heating 2 hours in 900～1170 ℃ the electric furnace that the forging mold behind the matched moulds is placed on temperature, takes out rapidly then;
Step 6: the forging mold that will take out rapidly is placed between two backing plates that are preheated to 300～400 ℃, be that quick-make is forged on the forcing press of 315～500t in nominal pressure, forging time is 30～60 seconds, and the heating backing plate is in order to prevent that the forging mold cooling is too fast in forging process;
Step 7: forge finish after, forging mold is placed in 200～300 ℃ the electric furnace and anneals, annealing time is 15 minutes, obtains surperficial flawless, no shrinkage cavity, directionally solidifying titanium aluminum alloy blades that allowance is little.
The specific embodiment two: what present embodiment and the specific embodiment one were different is: that the forging mold in the step 2 adopts is hot-die steel K403.The surface quality of shaping directionally solidifying titanium aluminum alloy blades is better.
The specific embodiment three: what present embodiment was different with the specific embodiment one or two is: the lubricant in the step 3 is a glass dust.The surface quality of shaping directionally solidifying titanium aluminum alloy blades is better.
The specific embodiment four: what present embodiment and the specific embodiment three were different is: the matched moulds gap of the forging mold in the step 4 is 2mm.The surface quality of shaping directionally solidifying titanium aluminum alloy blades is better.
Claims (4)
1. the Forging Technology of a directionally solidifying titanium aluminum alloy blades, it is characterized in that: the step of the Forging Technology of directionally solidifying titanium aluminum alloy blades is:
Step 1: the size of determining the directionally solidifying titanium aluminum alloy blades blank;
Step 2: adopt hot-die steel to make forging mold, the die cavity of forging mold is consistent with the profile of directionally solidifying titanium aluminum alloy blades;
Step 3: lubricant is spread upon uniformly on the surface of directionally solidifying titanium aluminum alloy blades blank and on the surface of the die cavity of forging mold;
Step 4: the directionally solidifying titanium aluminum alloy blades blank is placed in the die cavity of forging mold, then matched moulds;
Step 5: it is heating 2 hours in 900～1170 ℃ the electric furnace that the forging mold behind the matched moulds is placed on temperature, takes out rapidly then;
Step 6: the forging mold that will take out rapidly is placed between two backing plates that are preheated to 300～400 ℃, is that quick-make is forged on the forcing press of 315～500t in nominal pressure, and forging time is 30～60 seconds;
Step 7: forge finish after, forging mold is placed in 200～300 ℃ the electric furnace and anneals, annealing time is 15 minutes, obtains directionally solidifying titanium aluminum alloy blades.
2. according to the Forging Technology of the described a kind of directionally solidifying titanium aluminum alloy blades of claim 1, it is characterized in that: the forging mold in the described step 2 adopts hot-die steel K403 to make.
3. according to the Forging Technology of claim 1 or 2 described a kind of directionally solidifying titanium aluminum alloy blades, it is characterized in that: the lubricant in the described step 3 is a glass dust.
4. according to the Forging Technology of the described a kind of directionally solidifying titanium aluminum alloy blades of claim 3, it is characterized in that: the matched moulds gap of the forging mold in the described step 4 is 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103069597A CN101648252B (en) | 2009-09-14 | 2009-09-14 | Forging process for directionally solidifying titanium aluminum alloy blades |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103069597A CN101648252B (en) | 2009-09-14 | 2009-09-14 | Forging process for directionally solidifying titanium aluminum alloy blades |
Publications (2)
| Publication Number | Publication Date |
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| CN101648252A CN101648252A (en) | 2010-02-17 |
| CN101648252B true CN101648252B (en) | 2011-01-05 |
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| CN2009103069597A Expired - Fee Related CN101648252B (en) | 2009-09-14 | 2009-09-14 | Forging process for directionally solidifying titanium aluminum alloy blades |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011078B (en) * | 2010-12-23 | 2012-03-28 | 哈尔滨工业大学 | Method for refined and directional solidification of titanium aluminium alloy slab surface structure |
| CN107116167A (en) * | 2017-07-12 | 2017-09-01 | 安徽凯密克企业管理咨询有限公司 | A kind of forging technology of auto parts |
| CN108580770B (en) * | 2018-03-29 | 2019-12-27 | 西北工业大学 | Superplastic creep age forming method for TiAl-based alloy blade blank |
| CN114703436B (en) * | 2021-05-20 | 2023-05-12 | 哈尔滨工业大学 | Alloying method for improving high-temperature performance of directional solidification titanium aluminum alloy and prepared titanium aluminum alloy |
| CN114951522B (en) * | 2022-06-28 | 2023-08-11 | 中南大学 | Isothermal forging method of monocrystalline TiAl |
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2009
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