CN1132953C - Process for preparing high niobium Ti Al alloy large size cake material - Google Patents
Process for preparing high niobium Ti Al alloy large size cake material Download PDFInfo
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- CN1132953C CN1132953C CN 01134630 CN01134630A CN1132953C CN 1132953 C CN1132953 C CN 1132953C CN 01134630 CN01134630 CN 01134630 CN 01134630 A CN01134630 A CN 01134630A CN 1132953 C CN1132953 C CN 1132953C
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Abstract
The present invention provides a method for preparing large-sized high-niobium Ti-Al alloy cake. A process flow comprises smelting, soaking treatment, turning, wrapping, forging and slow cooling. The method is characterized in that smelting comprises first self consuming, self-consuming skull forming and second self consuming. Heat preservation is carried out at the temperature of 1100 to 1300DEGC for 24 to 48 hours, and then the socking treatment is carried out. The surface oxide skin of a cast ingot is removed. A pure stainless steel pipe with the outer diameter of 150 to 300mm and the wall thickness of 2 to 6mm is used as a wrap, and the cast ingot is put into the center of a titanium pipe. Both ends of the titanium pipe are sealed by argon-arc welding with stainless steel with the thickness of 2 to 6mm, and then the pure stainless steel pipe is coated by a stainless steel sheet with the thickness of 1 to 3mm. The pure stainless steel pipe is heated to be from 1250 to 1300 DEG C along with the furnace, heat preservation is carried out for the pure stainless steel pipe for 40 to 60 minutes, and then the pure stainless steel pipe is taken out of the furnace. The forged piece preheated for 6 to 10 hours is transferred to an oil hydraulic press of 3000 to 5000 tons for forging, the deformation temperature is from 1200 to 1350 DEG C, the rate of deformation is 1*(10<-3> to 10<-1>)/s, and the amount of deformation is from 60 to 80%. Low temperature tempering is carried out after forging. The method has the advantages of fine and small grain size and good comprehensive mechanical property.
Description
Technical field:
The invention provides a kind of process for preparing high niobium Ti Al alloy large size cake material.
Background technology:
High-niobium TiAl intermetallic compound is through in recent years research, at phasor, the research of aspect such as oxidation-resistance and microstructure and property has obtained a series of important progress, the high-temperature behavior that it is excellent, oxidation-resistance and creep resistance and be subjected to paying close attention to widely, the adding of high-content refractory metal niobium element makes the more common titanium aluminum alloy of the fusing point of alloy improve about 90--100 ℃, the solution strengthening of niobium element, make the high 150---200MPa of the more common titanium aluminum alloy of its yield strength of 900 ℃, the adding of high-melting-point niobium has reduced spread coefficient simultaneously, having improved oxidation-resistance, is the high-temperature structural material of new generation that has application potential most.When but the adding of high niobium brings superior high-temperature behavior, also increased the difficulty of the preparation of alloy, because alloy melting point, hot strength increases substantially the smelting temperature and the hot processing temperature that must improve alloy, high-niobium TiAl-base alloy still is in the starting stage at present as the research and development of high-temperature structural material of new generation, alloy preparation quality quality will be related to the heightened awareness to the alloy intrinsic performance, thereby can have a strong impact on the work of further optimization alloy research carry out smoothly, also be alloy moves towards the practical stage from conceptual phase prerequisite simultaneously, and good preparation technology is the prerequisite that obtains the high quality alloy, therefore the preparation technology of high niobium Ti Al alloy is carried out preliminary exploratory development and has realistic meanings.The preparation technology of present common titanium aluminium base alloy mainly contains three kinds, i.e. ingot metallurgy technology, powder metallurgical technique and pure casting technique, and wherein ingot metallurgy technology is common titanium aluminium base alloy preparation technology the most commonly used.
Document Kim Y.W., " Microstructual Evolution and Mechanical Properties of aForged Gamma Titanium Aluminide Alloy ", Acta Metall.Mater., 1992,40:1121 provides the forging process of common titanium aluminium sample.
Document Semiain S.L.Seetharaman V.and Jain V.K., " Microstructure Developmentduring Conventional and Isothermal Hot Forging of a Near-Gamma TitaniumAluminide ", Metal.Trans.A, 1994,25A:275 provides the isothermal forging process of nearly γ-titanium aluminium base alloy.
Traditional melting method comprises induction melting, the vacuum consumable remelting, three kinds of main melting technologies such as plasma melting, first kind of technology generally is the pure metal constituent element to be mixed carry out the induction heating melting, then two kinds of technology generally is pure constituent element to be mixed be pressed into electrode and carry out remelting.Because the rising of the fusing point of high niobium alloy makes high niobium alloy when adopting induction melting technology, high niobium alloy is difficult to reach very high teeming temperature, make high niobium alloy ingot casting macroshrinkage and a large amount of loosening often occur, can't forge at all, but when adopting induction melting technology, alloy solution can be through relatively more sufficient homogenizing process before casting, the composition of alloy is relatively even, solidify rapidly after then two kinds of melting technologies make electrode melting become molten drop to splash into cold-crucible, droplet temperature temperature with regard to fusing is more much higher than the melt temperature of induction melting, and molten drop is very little, therefore single molten drop diffusion process is very abundant, in process of setting, do not deposit loose and component segregation basically, but adopt the composition difference of each several part on the consumable electrode cross section of pure constituent element preparation, therefore composition is different between molten drop and the molten drop, owing to solidify rapidly after single molten drop splashes into water jacketed copper crucible, there is not the homogenization of composition process between molten drop and the molten drop, the high-melting-point niobium has little time to spread homogenizing, make alloy the macrosegregation of niobium aluminium occur, this will cause as-cast structure seriously uneven, for addressing this problem, we utilize scull processing alloy composition more even, and vacuum consumable remelting processing ingot casting density advantage of higher, two kinds of melting technologies are combined with each other, be referred to as compound melting technology, promptly utilize induction scull remelting processing that the alloy constituent element is pre-alloyed, and prealloy poured into consumable electrode, again with composition consumable electrode remelting relatively uniformly, thereby make ingot casting densification and the further homogenizing of composition.
The heat processing technique commonly used of titanium aluminum alloy comprises isothermal forging at present, technologies such as canned forging and hot extrusion, and wherein canned forging is a kind of relatively simple, the heat processing technique that equipment requirements is not high.For high Nb titanium aluminum alloy, have only coloured institute of new metallic substance National Key Laboratory of University of Science ﹠ Technology, Beijing and northwest to carry out the shaping research of small-scale test sample both at home and abroad.And do not have the research report for large-sized high niobium Ti Al alloy cake material preparation.
The objective of the invention is to prepare large size cake material, use on the aircraft engine diskware for high niobium Ti Al alloy and lay the first stone with excellent comprehensive mechanical property according to the characteristics of high niobium Ti Al alloy.
Summary of the invention:
Technical process of the present invention is as follows:
Melting → evenly heating processing → turning processing → jacket → forging → slowly cooling
It is as follows that high niobium Ti Al alloy large size cake material prepares concrete processing parameter:
Melting: consumable+consumable scull+second time consumable for the first time
Evenly heating annealing: 1100-1300 ℃ is incubated 24-48 hour, and furnace cooling is come out of the stove.
Turning processing: the surface scale turning of the ingot casting after will annealing is removed, and surfaceness reaches Ra6.3-1.6.
Jacket: adopt the pure stainless steel tube of external diameter 150-300mm wall thickness 2-6mm as jacket, ingot casting is placed titanium pipe central authorities, and adopt argon arc welding to bind with the thick stainless pipe of 2-6mm two ends, stainless steel tube adds the thick stainless steel plate of one deck 1-3mm outward again to be wrapped, real with the high-temperature flame-proof tampon between stainless steel tube and the stainless steel plate.
Jacket heating: be heated to 1250-1300 ℃ of insulation 40-60 minute with stove, come out of the stove at once.
Forge: will move on to rapidly through the forging of preheating in 6-10 hour on the 3000-5000 ton oil press and forge, deformation temperature is 1200-1350 ℃, and deformation rate is 1 * 10
-3-10
-1/ s, deflection are 60-80%.Because forging compressing head and backing plate temperature are generally room temperature in the canned forging process, pressure head and backing plate have strong refrigeration to the forging two ends.
After forging is finished forging placed rapidly in 600-800 ℃ the low temperature oven, carry out low-temperaturetempering, prevent that forging is owing to inner high residual stress causes forging cracking.
The invention has the advantages that:, avoided because the component segregation that high-melting-point Nb causes owing to use the Nb-Al master alloy in the fusion process.Can prepare large size high niobium Ti Al alloy cake material, forging smooth surface flawless.The grain-size of organizing of forging is 10-30 μ m, and very even, and for the TiAl alloy, such grain-size is very tiny, makes material have good comprehensive mechanical property.
Description of drawings:
Fig. 1 is that the present invention prepares Ti-45Al-8.5Nb-0.2W-0.1C-0.05Y alloy large size cake material photo in kind.
Embodiment:
Table 1 is prepared the Ti-45Al-8.5Nb-0.2W-0.1C-0.05Y alloy large size cake material
| Homogenizing annealing | Jacket | The jacket heating | Forge | Performance | |
| Embodiment 1 | ?1200℃/36h | External diameter 150mm, the outer bed thickness 1mm of the thick 5mm in thick 5mm two ends | ?1250℃/60m | ?1200℃ ?1×10 -3?70％ | Forging smooth surface flawless 15 μ m |
| Embodiment 2 | ?1250℃/24h | External diameter 200mm, the outer bed thickness 2mm of the thick 3mm in thick 3mm two ends | ?1300℃/40m | ?1250℃ ?1×10 -2?80％ | Forging smooth surface flawless 20 μ m |
Claims (1)
1, a kind of process for preparing high niobium Ti Al alloy large size cake material, technical process is:
Melting → evenly heating processing → turning processing → jacket → forging → slowly cooling is characterized in that:
A, melting: consumable+consumable scull+second time consumable for the first time;
B, evenly heating annealing: 1100-1300 ℃ is incubated 24-48 hour, and furnace cooling is come out of the stove;
C, turning processing: the surface scale turning of the ingot casting after will annealing is removed, and surface smoothness reaches 5- 7;
D jacket: adopt the pure stainless steel tube of external diameter 150-300mm wall thickness 2-6mm as jacket, ingot casting is placed titanium pipe central authorities, and adopt argon arc welding to bind with the thick stainless pipe of 2-6mm two ends, stainless steel tube adds the thick stainless steel plate of one deck 1-3mm outward again to be wrapped, real with the high-temperature flame-proof tampon between stainless steel tube and the stainless steel plate;
E, jacket heating: be heated to 1250-1300 ℃ of insulation 40-60 minute with stove, come out of the stove at once;
F, forging: will move on to rapidly through the forging of preheating in 6-10 hour on the 3000-5000 ton oil press and forge, deformation temperature is 1200-1350 ℃, and deformation rate is 1 * 10
-3-10
-1/ s, deflection are 60-80%;
G, forge after finishing in the low temperature oven that forging is placed on 600-800 ℃, carry out low-temperaturetempering.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01134630 CN1132953C (en) | 2001-11-08 | 2001-11-08 | Process for preparing high niobium Ti Al alloy large size cake material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01134630 CN1132953C (en) | 2001-11-08 | 2001-11-08 | Process for preparing high niobium Ti Al alloy large size cake material |
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| CN1352315A CN1352315A (en) | 2002-06-05 |
| CN1132953C true CN1132953C (en) | 2003-12-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817135A (en) * | 2010-04-13 | 2010-09-01 | 中南大学 | Manufacturing method of TiAl-based alloy high-temperature double-layer oxygen-isolating sheath |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100386558C (en) * | 2005-02-03 | 2008-05-07 | 宝钢集团上海五钢有限公司 | Sticking adiabatic cotton and method of making the same |
| CN100500907C (en) * | 2007-04-02 | 2009-06-17 | 北京科技大学 | Heat treatment process for large size as-cast high-Nb TiAl-base alloy to obtain complete lamellar structure |
| CN103572082B (en) * | 2013-11-18 | 2015-08-05 | 北京科技大学 | A kind of high Nb containing TiAl based alloy and preparation method thereof |
| CN103773981B (en) * | 2013-12-25 | 2016-06-29 | 西安西工大超晶科技发展有限责任公司 | A kind of method of smelting of high Nb-TiAl base alloy |
| CN103801581B (en) * | 2014-01-24 | 2015-11-11 | 北京科技大学 | A kind of high-niobium TiAl-base alloy preparation of plates method |
| CN105506525B (en) * | 2015-12-30 | 2017-05-17 | 中国航空工业集团公司北京航空材料研究院 | Preparation method of Ti2AlNb-based alloy large-size uniform fine-grain bar |
| JP6909412B2 (en) * | 2016-09-15 | 2021-07-28 | 日立金属株式会社 | Material for metal mask and its manufacturing method |
| CN107952922B (en) * | 2017-11-07 | 2019-04-19 | 西北工业大学 | A kind of method of TiAl alloy cogging forging |
| CN108115365A (en) * | 2017-12-20 | 2018-06-05 | 西安西工大超晶科技发展有限责任公司 | A kind of jacket cogging forging molding process of titanium-aluminium alloy ingot casting |
| CN110643851A (en) * | 2019-10-15 | 2020-01-03 | 中国航发北京航空材料研究院 | TiAl-based composite material and thermal mechanical treatment method thereof |
| CN111299613A (en) * | 2020-03-27 | 2020-06-19 | 宁波江丰电子材料股份有限公司 | Machining method of titanium-aluminum alloy target material, product and application thereof |
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2001
- 2001-11-08 CN CN 01134630 patent/CN1132953C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817135A (en) * | 2010-04-13 | 2010-09-01 | 中南大学 | Manufacturing method of TiAl-based alloy high-temperature double-layer oxygen-isolating sheath |
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