CN102011078A - Method for refined and directional solidification of titanium aluminium alloy slab surface structure - Google Patents
Method for refined and directional solidification of titanium aluminium alloy slab surface structure Download PDFInfo
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- CN102011078A CN102011078A CN 201010602006 CN201010602006A CN102011078A CN 102011078 A CN102011078 A CN 102011078A CN 201010602006 CN201010602006 CN 201010602006 CN 201010602006 A CN201010602006 A CN 201010602006A CN 102011078 A CN102011078 A CN 102011078A
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Abstract
A method for refined and directional solidification of titanium aluminium alloy slab surface structure relates to a processing method for titanium aluminium alloy slab surface structure. The method of the present invention solves the problems that a flaky and loose TiO2 and Al2O3 mixed oxide film is formed on titanium aluminium alloy surface in the prior thermal treatment method, and that compound structure of directionally solidified columnar crystal structure and equiaxial fine grains can not be formed. The method comprises the following steps of: testing a temperature A achieved by transforming the directionally solidified titanium alloy slab from [gamma] phase to [alpha] phase; after being subjected to surface plastic deformation, sealing the titanium aluminium alloy slab into a quartz tube; after vacuuming the quartz tube, heating the quartz tube to a temperature 10-20 EDG C higher than the temperature A and maintaining the temperature for 10min to 20min; and quenching to obtain a directionally solidified titanium aluminium alloy slab with refined surface structure, wherein the surface layer of the titanium alloy slab is a fine grain layer, and the structure at the centre part is maintained in a state of directionally solidified columnar crystal structure. The method can be used for manufacturing blades of aircraft engines.
Description
Technical field
The present invention relates to the treatment process of titanium aluminum alloy slab textura epidermoidea.
Background technology
The modern military aircraft is more and more higher to the requirement of engine thrust-weight ratio, and the performance of engine depends primarily on the performance of blade.The material that is used for engine blade now mostly is titanium aluminum alloy, the titanium aluminum alloy original structure of directional freeze is a column crystal, its columanar structure has along the preferred orientation of charge length direction growth, columnar grain is approximately 10mm along the length of grain growing direction, the vertical section microstructure of columnar grain is a complete lamellar structure, grain-size is about 300 μ m～500 μ m, and the direction of growth of each intragranular synusia is inconsistent.Titanium aluminum alloy blades base for directional freeze, if can be aided with follow-up thermal treatment process by the top layer plastic deformation process, axle is carefully brilliant in order to wait, inside is the complex tissue of directed thick column crystal to obtain the top layer, just can satisfy the requirement to fatigue strength, fracture toughness property, plasticity, creep-resistant property and antifatigue crack propagation ability simultaneously.If expect the recrystal grain of this alloy, as follows by existing method:
T
r(K)＝(0.35～0.4)T
m，
T wherein
r---recrystallization temperature,
T
m---melting point metal
The recrystallization temperature scope that calculates titanium aluminum alloy is 700 ℃～900 ℃, after the cold deformation of titanium aluminum alloy process, under 700 ℃～900 ℃ high temperature, take place to reply again to make its recrystallize, any variation does not take place in the grain-size of the titanium aluminum alloy that obtains and form, continue again to improve temperature, obtained containing the loose TiO of hole
2And Al
2O
3Mixed oxide films, this oxide film reach certain critical thickness (≈ 10 μ m) and promptly begin to peel off, and peel off and start from metal/membrane interface, can not form ideal directional freeze columanar structure at all and wait the thin brilliant compound weave construction of axle.
Summary of the invention
The present invention will solve existing heat treating method makes the titanium aluminum alloy surface form flaky loose TiO
2And Al
2O
3Mixed oxide films can not form directional freeze columanar structure and wait the technical problem of the thin brilliant compound weave construction of axle, and the method for a kind of refinement directionally solidifying titanium aluminum alloy slab textura epidermoidea is provided.
The method of a kind of refinement directionally solidifying titanium aluminum alloy slab of the present invention textura epidermoidea, carry out according to the following steps: one, test directionally solidifying titanium aluminum alloy slab by γ in opposite directions α change the temperature A that finishes mutually; Two, at room temperature, utilize ball rolling to carry out surface plastic deformation the titanium aluminum alloy slab, draught is 0.1mm～0.2mm; Three, will put into silica tube through the titanium aluminum alloy slab sample behind the surface plastic deformation and seal, silica tube will be evacuated to 1 * 10
-4Pa～1 * 10
-3Pa; Four, the silica tube of step 3 is placed on be heated in the process furnace than temperature A high 10 ℃～20 ℃ temperature and keep 10min～20min, taking out aluminum alloy slab then from silica tube, to put into temperature be 10 ℃～25 ℃ quenching-in water, obtains the directionally solidifying titanium aluminum alloy slab of textura epidermoidea's refinement.
The present invention adopt than traditional thermal treatment temp high 400 ℃～800 ℃ temperature; and employing heating under vacuum mode; obtained the surface and still be the titanium aluminum alloy slab of the complex tissue of directional freeze columanar structure for thin brilliant, the center of axle of waiting of refinement; adopt traditional heating means; because each autoxidisable substance free energy of formation of titanium atom and aluminium atom is very low; and the activity of aluminium atom is negative deviation; in the pyritous air; its resistance of oxidation very a little less than, the aluminium atom is difficult to selective oxidation and generates fine and close and have the Al of anti-oxidation protection
2O
3Protective membrane, but generated the loose TiO that contains many cavities
2And Al
2O
3Mixed oxide films; And the present invention adopts the heating under vacuum mode, has avoided contacting of titanium aluminum alloy and high temperature air, has avoided the formation of loose mixed oxide films; Of the present invention is carried out a spot of surface plastic deformation and single thermal treatment to the titanium aluminum alloy slab, has avoided cycle heat treatment easily to make the top layer be subjected to the effect of thermal stresses and the shortcoming that comes off.Having formed grain size in the thickness range of the top layer 100 μ m～200 μ m of the titanium aluminum alloy slab that the present invention obtains is the thin crystal layer of 10 μ m～30 μ m, and the tissue in blank centre keeps original directional freeze columanar structure state, formed directional freeze columanar structure and waited the thin brilliant compound weave construction of axle, can satisfy high temperature creep and high temperature fatigue performance demands simultaneously blade.Can be used for making blade of aviation engine.
Description of drawings
Fig. 1 is the differential thermal analysis curve figure of Ti-46Al-0.5W-0.5Si alloy slab in the step 1 of embodiment 12; Fig. 2 is the metallographic structure photo on the grain growing direction of Ti-46Al-0.5W-0.5Si alloy slab in the step 1 of embodiment 12; Fig. 3 is the microstructure picture of the crystal grain vertical section of Ti-46Al-0.5W-0.5Si alloy slab in the step 1 of embodiment 12; Fig. 4 is the microstructure picture of crystal grain vertical section of directionally solidifying titanium aluminum alloy slab of textura epidermoidea's refinement of embodiment 12 preparation.
Embodiment
Embodiment one: the method for a kind of refinement directionally solidifying titanium aluminum alloy slab textura epidermoidea of present embodiment, carry out according to the following steps: one, test directionally solidifying titanium aluminum alloy slab by γ in opposite directions α change the temperature A that finishes mutually; Two, at room temperature, utilize ball rolling to carry out surface plastic deformation the titanium aluminum alloy slab, draught is 0.1mm～0.2mm; Three, will put into silica tube through the titanium aluminum alloy slab sample behind the surface plastic deformation and seal, silica tube will be evacuated to 1 * 10
-4Pa～1 * 10
-3Pa; Four, the silica tube of step 3 is placed on be heated in the process furnace than temperature A high 10 ℃～20 ℃ temperature and keep 10min～20min, taking out aluminum alloy slab then from silica tube, to put into temperature be 10 ℃～25 ℃ quenching-in water, obtains the directionally solidifying titanium aluminum alloy slab of textura epidermoidea's refinement.
In the present embodiment test directionally solidifying titanium aluminum alloy slab by γ in opposite directions the α method that changes the temperature A that finishes mutually be prior art.
Present embodiment adopt than traditional thermal treatment temp high 400 ℃～800 ℃ temperature; and employing heating under vacuum mode; obtained the surface and still be the titanium aluminum alloy slab of the complex tissue of directional freeze columanar structure for thin brilliant, the center of axle of waiting of refinement; adopt traditional heating means; because each autoxidisable substance free energy of formation of titanium atom and aluminium atom is very low; and the activity of aluminium atom is negative deviation; in the pyritous air; its resistance of oxidation very a little less than, the aluminium atom is difficult to selective oxidation and generates fine and close and have the Al of anti-oxidation protection
2O
3Protective membrane, but generated the loose TiO that contains many cavities
2And Al
2O
3Mixed oxide films; And the present invention adopts the heating under vacuum mode, has avoided contacting of titanium aluminum alloy and high temperature air, has avoided the formation of loose mixed oxide films; Of the present invention is carried out a spot of surface plastic deformation and single thermal treatment to the titanium aluminum alloy slab, has avoided cycle heat treatment easily to make the top layer be subjected to the effect of thermal stresses and the shortcoming that comes off.Having formed grain size in the thickness range of the about 100 μ m in the top layer of the titanium aluminum alloy slab that the present invention obtains～200 μ m is the thin crystal layer of 10 μ m～30 μ m, and the tissue in blank centre keeps original directional freeze columanar structure state.Can satisfy high temperature creep and high temperature fatigue performance demands simultaneously to blade.Can be used for making blade of aviation engine.
Embodiment two: what present embodiment and embodiment one were different is: the draught of the surface plastic deformation in the step 2 is 0.12mm～0.18mm.Other is identical with embodiment one.
Embodiment three: what present embodiment and embodiment one were different is: the draught of the surface plastic deformation in the step 2 is 0.15mm.Other is identical with embodiment one.
Embodiment four: what present embodiment was different with one of embodiment one to three is: in the step 3 silica tube is evacuated to 2 * 10
-4Pa～8 * 10
-4Pa.Other is identical with one of embodiment one to three.
Embodiment five: what present embodiment was different with one of embodiment one to three is: in the step 3 silica tube is evacuated to 5 * 10
-4Pa.Other is identical with one of embodiment one to three.
Embodiment six: what present embodiment was different with one of embodiment one to five is: in the step 4 silica tube be heated to than temperature A high 12 ℃～18 ℃ temperature and keep 12min～18min.Other is identical with one of embodiment one to five.
Embodiment seven: what present embodiment was different with one of embodiment one to five is: silica tube is heated to than the high 15 ℃ temperature of temperature A and keeps 15min in the step 4.Other is identical with one of embodiment one to five.
Embodiment eight: what present embodiment was different with one of embodiment one to seven is: the temperature of water is 12 ℃～23 ℃ when quenching in the step 4.Other is identical with one of embodiment one to seven.
Embodiment nine: what present embodiment was different with one of embodiment one to seven is: the temperature of water is 15 ℃ when quenching in the step 4.Other is identical with one of embodiment one to seven.
Embodiment ten: what present embodiment was different with one of embodiment one to nine is: in the step 1 test directionally solidifying titanium aluminum alloy slab by γ in opposite directions the α method that changes the temperature A that finishes mutually be: the titanium aluminum alloy slab is carried out differential scanning calorimetric analysis (DSC), the DSC test parameter is: the intensification scope is 50 ℃～1450 ℃, temperature rise rate is 18K/min～22K/min, on the differential thermal curve that records, the pairing temperature of endotherm(ic)peak in 1200 ℃～1400 ℃ temperature range, be the titanium aluminum alloy slab by γ in opposite directions α change the temperature A that finishes mutually.Other is identical with one of embodiment one to nine.
Embodiment 11: what present embodiment was different with one of embodiment one to nine is: in the step 1 test directionally solidifying titanium aluminum alloy slab by γ in opposite directions the α method that changes the temperature A that finishes mutually be: the titanium aluminum alloy slab is carried out differential scanning calorimetric analysis (DSC), the DSC test parameter is: the intensification scope is 60 ℃～1400 ℃, temperature rise rate is 20K/min, on the differential thermal curve that records, the pairing temperature of endotherm(ic)peak in 1200 ℃～1400 ℃ temperature range, be the titanium aluminum alloy slab by γ in opposite directions α change the temperature A that finishes mutually.Other is identical with one of embodiment one to nine.
Embodiment 12: the method for a kind of refinement directionally solidifying titanium aluminum alloy slab textura epidermoidea of present embodiment is carried out according to the following steps: one, test directional freeze Ti-46Al-0.5W-0.5Si alloy slab by γ in opposite directions α to change the temperature A that finishes mutually be 1370 ℃; Two, at room temperature, utilize ball rolling to carry out surface plastic deformation Ti-46Al-0.5W-0.5Si alloy slab, draught is 0.15mm; Three, will put into silica tube through Ti-46Al-0.5W-0.5Si alloy slab and seal, silica tube will be evacuated to 1 * 10
-3Pa; Four, the silica tube of step 3 is placed on is heated to 1380 ℃ and keep 15min in the process furnace, taking out aluminum alloy slab then from container, to put into temperature be 20 ℃ quenching-in water, obtains the directionally solidifying titanium aluminum alloy slab of textura epidermoidea's refinement.
In the present embodiment step 1 test Ti-46Al-0.5W-0.5Si alloy slab by γ in opposite directions the α method that changes the temperature A that finishes mutually be: Ti-46Al-0.5W-0.5Si alloy slab is carried out differential scanning calorimetric analysis (DSC) test, the DSC test parameter is: the intensification scope is 50 ℃～1400 ℃, and temperature rise rate is 20K/min.The differential thermal curve that obtains as shown in Figure 1, as can be seen from Figure 1, the γ → α of Ti-46Al-0.5W-0.5Si alloy slab to change the temperature A finish mutually be 1370 ℃.
Metallographic structure photo on the direction of growth of the Ti-46Al-0.5W-0.5Si alloy slab in the present embodiment step 1 as shown in Figure 2, the microstructure picture of the vertical section of columnar grain as shown in Figure 3, as can be seen from Figure 2, Ti-46Al-0.5W-0.5Si alloy slab original structure is a column crystal, and crystal grain is 10mm～30mm along the height of grain growing direction.The vertical section microstructure of the crystal grain of Ti-46Al-0.5W-0.5Si alloy slab is a complete lamellar structure as can be seen from Figure 3, and grain-size is about 300 μ m～500 μ m, and the direction of growth of each intragranular synusia is inconsistent.
The microstructure picture of the vertical section of the crystal grain of the directionally solidifying titanium aluminum alloy slab of textura epidermoidea's refinement that present embodiment obtains as shown in Figure 4, the top layer of Ti-46Al-0.5W-0.5Si alloy slab is that to have formed grain size in the thickness range of 100 μ m～200 μ m be the thin crystal layer of 10 μ m～30 μ m as can be seen from Figure 4, and the grain size in blank centre is 300 μ m～500 μ m, be consistent with the diameter of crystal grain before not heat-treating, so keeping original directional freeze columanar structure state.
Present embodiment adopt than traditional thermal treatment temp high 480 ℃～680 ℃ temperature; and employing heating under vacuum mode; obtained the surface and still be the titanium aluminum alloy slab of the complex tissue of directional freeze columanar structure for thin brilliant, the center of axle of waiting of refinement; adopt traditional heating means; because each autoxidisable substance free energy of formation of titanium atom and aluminium atom is very low; and the activity of aluminium atom is negative deviation; in the pyritous air; its resistance of oxidation very a little less than, the aluminium atom is difficult to selective oxidation and generates fine and close and have the Al of anti-oxidation protection
2O
3Protective membrane, but generated the loose TiO that contains many cavities
2And Al
2O
3Mixed oxide films; And present embodiment adopts the heating under vacuum mode, has avoided contacting of titanium aluminum alloy and high temperature air, has avoided the formation of loose mixed oxide films; Present embodiment only the titanium aluminum alloy slab is carried out a spot of surface plastic deformation and single thermal treatment, avoided cycle heat treatment easily to make the top layer be subjected to the effect of thermal stresses and the shortcoming that comes off.The top layer of the titanium aluminum alloy slab that present embodiment obtains is that grain size is the thin crystal layer of 10 μ m～30 μ m, and the tissue in blank centre keeps original directional freeze columanar structure state, formed directional freeze columanar structure and waited the thin brilliant compound weave construction of axle, can satisfy high temperature creep and high temperature fatigue performance demands simultaneously blade.Can be used for making blade of aviation engine.
Claims (10)
1. the method for a refinement directionally solidifying titanium aluminum alloy slab textura epidermoidea is characterized in that the method for refinement directionally solidifying titanium aluminum alloy slab textura epidermoidea is carried out according to the following steps: one, test directionally solidifying titanium aluminum alloy slab by γ in opposite directions α change the temperature A that finishes mutually; Two, at room temperature, utilize ball rolling to carry out surface plastic deformation the titanium aluminum alloy slab, draught is 0.1mm～0.2mm; Three, will put into silica tube through the titanium aluminum alloy slab sample behind the surface plastic deformation and seal, silica tube will be evacuated to 1 * 10
-4Pa～1 * 10
-3Pa; Four, the silica tube of step 3 is placed on be heated in the process furnace than temperature A high 10 ℃～20 ℃ temperature and keep 10min～20min, taking out aluminum alloy slab then from silica tube, to put into temperature be 10 ℃～25 ℃ quenching-in water, obtains the directionally solidifying titanium aluminum alloy slab of textura epidermoidea's refinement.
2. the method for a kind of refinement directionally solidifying titanium aluminum alloy slab according to claim 1 textura epidermoidea, the draught that it is characterized in that the surface plastic deformation in the step 2 is 0.12mm～0.18mm.
3. the method for a kind of refinement directionally solidifying titanium aluminum alloy slab according to claim 1 and 2 textura epidermoidea, the draught that it is characterized in that the surface plastic deformation in the step 2 is 0.15mm.
4. the method for a kind of refinement directionally solidifying titanium aluminum alloy slab according to claim 1 and 2 textura epidermoidea is characterized in that in the step 3 silica tube being evacuated to 2 * 10
-4Pa～8 * 10
-4Pa.
5. the method for a kind of refinement directionally solidifying titanium aluminum alloy slab according to claim 1 and 2 textura epidermoidea is characterized in that in the step 3 silica tube being evacuated to 5 * 10
-4Pa.
6. the method for a kind of refinement directionally solidifying titanium aluminum alloy slab according to claim 1 and 2 textura epidermoidea, it is characterized in that silica tube in the step 4 be heated to than temperature A high 12 ℃～18 ℃ temperature and keep 12min～18min.
7. the method for a kind of refinement directionally solidifying titanium aluminum alloy slab according to claim 1 and 2 textura epidermoidea is characterized in that silica tube in the step 4 is heated to than the high 15 ℃ temperature of temperature A and keeps 15min.
8. the method for a kind of refinement directionally solidifying titanium aluminum alloy slab according to claim 1 and 2 textura epidermoidea, the temperature of water is 12 ℃～23 ℃ when it is characterized in that quenching in the step 4.
9. the method for a kind of refinement directionally solidifying titanium aluminum alloy slab according to claim 1 and 2 textura epidermoidea, the temperature of water is 15 ℃ when it is characterized in that quenching in the step 4.
10. the method for a kind of refinement directionally solidifying titanium aluminum alloy slab according to claim 1 and 2 textura epidermoidea, it is characterized in that in the step 1 test directionally solidifying titanium aluminum alloy slab by γ in opposite directions the α method that changes the temperature A that finishes mutually be: the titanium aluminum alloy slab is carried out differential scanning calorimetric analysis, the differential scanning calorimetric analysis test parameter is: the intensification scope is 50 ℃～1450 ℃, temperature rise rate is 18K/min～22K/min, on the differential thermal curve that records, the pairing temperature of endotherm(ic)peak in 1200 ℃～1400 ℃ temperature range, be the titanium aluminum alloy slab by γ in opposite directions α change the temperature A that finishes mutually.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472085A (en) * | 2013-09-29 | 2013-12-25 | 哈尔滨工业大学 | Experimental equipment and experimental method for Ti-Al base alloy directional solidification under action of direct current |
| CN105821470A (en) * | 2016-04-14 | 2016-08-03 | 南京理工大学 | Dual-structure titanium aluminum (TiAl) alloy and preparation method thereof |
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|---|---|---|---|---|
| EP0375374A1 (en) * | 1988-12-23 | 1990-06-27 | Technology Development Corporation | Low density heat resistant intermetallic alloys of the A13 Ti type |
| CN101648252A (en) * | 2009-09-14 | 2010-02-17 | 哈尔滨工业大学 | Forging process for directionally solidifying titanium aluminum alloy blades |
| CN101797687A (en) * | 2010-01-19 | 2010-08-11 | 哈尔滨工业大学 | Preparation method of TiAl alloy with fine grain full synusia tissue |
| CN101875106A (en) * | 2009-11-20 | 2010-11-03 | 北京科技大学 | Preparation method of directional solidification high-niobium TiAl-base alloy |
-
2010
- 2010-12-23 CN CN2010106020068A patent/CN102011078B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0375374A1 (en) * | 1988-12-23 | 1990-06-27 | Technology Development Corporation | Low density heat resistant intermetallic alloys of the A13 Ti type |
| CN101648252A (en) * | 2009-09-14 | 2010-02-17 | 哈尔滨工业大学 | Forging process for directionally solidifying titanium aluminum alloy blades |
| CN101875106A (en) * | 2009-11-20 | 2010-11-03 | 北京科技大学 | Preparation method of directional solidification high-niobium TiAl-base alloy |
| CN101797687A (en) * | 2010-01-19 | 2010-08-11 | 哈尔滨工业大学 | Preparation method of TiAl alloy with fine grain full synusia tissue |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472085A (en) * | 2013-09-29 | 2013-12-25 | 哈尔滨工业大学 | Experimental equipment and experimental method for Ti-Al base alloy directional solidification under action of direct current |
| CN103472085B (en) * | 2013-09-29 | 2016-03-09 | 哈尔滨工业大学 | The base alloy directionally solidified experimental facilities of Ti-Al under DC current effect and experimental technique |
| CN105821470A (en) * | 2016-04-14 | 2016-08-03 | 南京理工大学 | Dual-structure titanium aluminum (TiAl) alloy and preparation method thereof |
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| CN102011078B (en) | 2012-03-28 |
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