CN101988167A - High-temperature titanium alloy - Google Patents
High-temperature titanium alloy Download PDFInfo
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- CN101988167A CN101988167A CN 201010571022 CN201010571022A CN101988167A CN 101988167 A CN101988167 A CN 101988167A CN 201010571022 CN201010571022 CN 201010571022 CN 201010571022 A CN201010571022 A CN 201010571022A CN 101988167 A CN101988167 A CN 101988167A
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Abstract
The invention discloses a high-temperature titanium alloy, which belongs to the field of alloys. The highest service temperature of the high-temperature titanium alloy can reach 600 DEG C. The high-temperature titanium alloy is characterized in that: the content of main alloy elements is adjusted on the basis of the conventional 600 DEG C high-temperature titanium alloy; meanwhile, Mo, Nb and rare-earth element (neodymium) Nd are added. The alloy comprises the following components in percentage by weight: 6.2 to 6.5 percent of Al, 3.5 to 4.0 percent of Zr, 2.0 to 2.5 percent of Sn, 0.1 to 0.3 percent of Mo, 0.6 to 0.9 percent of Nb, 0.3 to 0.4 percent of Si, 0.4 to 0.8 percent of Nd and the balance of Ti. The alloy has high heat strength and good thermal stability. The alloy can be used as an alternative material for high-temperature titanium alloy components such as air compressor discs, blades and the like in aerial engines.
Description
Technical field
The invention belongs to the titanium base alloy technical field, be specifically related to a kind of titanium base alloy that is applied in 600 ℃ of life-time service on the aircraft engine.
Background technology
High-temperature titanium alloy has excellent heat resistance, low density and good solidity to corrosion, is used for making calm the anger dish, the casing etc. of aircraft engine at aerospace field more.The use temperature of high-temperature titanium alloy develops into 600 ℃ from initial 400 ℃, the IMI 834 of external 600 ℃ of high-temperature titanium alloys such as Britain, the Ti-1100 of the U.S., be used for aircraft engine, improved the performance of engine significantly, Muscovite BT36 is in the applied research stage.The 600 ℃ of high-temperature titanium alloy Ti60 and the Ti600 of China development also reach advanced world standards on intensity.At present, further improve the use temperature of high-temperature titanium alloy, and make its over-all properties obtain the emphasis that matched well becomes research.
The development of high-temperature titanium alloy mainly is subjected to heat resistance and thermal stability limit.600 ℃ of high-temperature titanium alloys almost are that Ti-Al-Zr-Sn-Mo-Si is the high equivalent thickness of aluminium alloy of nearly α type entirely.This alloy can effectively improve the intensity of alloy by the content that increases Al, Sn, Zr, but thermostability has in various degree decline behind life-time service.Reason is that more Al and the Sn of adding can cause separating out a large amount of Ti in the alloy
3X (X=Al, Sn) fragility phase descends the alloy thermostability.Thermostability has characterized material and kept plasticity and flexible ability under the high temperature long duration of action, is an important mechanical performance index of high-temperature titanium alloy.Have great importance for the high temperature life-time service reliability that guarantees the high-temperature titanium alloy parts.
The 600 ℃ of high-temperature titanium alloy nominal compositions in table 1 various countries
Table 1 is domestic and international 5 kinds of 600 ℃ of high-temperature titanium alloys and nominal composition thereof.Report that from external and domestic lot of documents these five kinds of alloys all have higher room temperature and hot strength as can be known, tensile strength is all at 1000～1100Mpa and 600～750Mpa, but the result of study for thermal stability differs, most barely satisfactory, some alloy plasticity descends and reaches more than 50%, can not reach the design objective of 600 ℃ of high-temperature titanium alloys for thermal stability.Therefore, in order to improve high-temperature titanium alloy 600 ℃ of reliabilities of using down, need a kind of alloy of design to make it have higher heat resistance, can also have thermostability preferably simultaneously, over-all properties obtains good coupling.
The performance of alloy depends on its component to a certain extent, and composition all contain Al, Zr, Sn, Mo and Si element in existing 600 ℃ of high-temperature titanium alloys, and weight percent is close as can be known from table.Wherein Al is a α phase stable element, Zr and Sn are neutral element, and three kinds of elements are used for guaranteeing the heat resistance of alloy jointly, and Mo is a β phase stable element, the adding of a spot of β phase stable element can improve the workability of alloy, and the adding of Si can improve the alloy creep drag.The adding of these elements can well reinforced alloys.High-temperature titanium alloy is through secular development, and these five kinds of elements almost become indispensable integral part.On this basis, the alloy that has has also added weak β phase stable element Nb and W, and the alloy that also has adds a certain amount of rare earth Nd or Y.These five kinds of alloying constituent differences just are that the addition of main alloying element is different slightly, have perhaps added other alloying element.Generally, by optimizing and strict control alloy composition constituent content, improve alloy treatment technology and often can play the effect that improves the alloy thermostability.
Summary of the invention
The present invention seeks to by optimizing the composition of alloy, development and design go out a kind of can be at the higher heat resistance of having of 600 ℃ of following long term operations and the high-temperature titanium alloy of thermostability preferably.
A kind of high-temperature titanium alloy, this alloy comprises Ti, Al, Zr, Sn and Si, it is characterized in that: also contain Nb, Mo, three kinds of elements of Nd in this alloy simultaneously, each composition and weight percent thereof are in the alloy: Al:6.2～6.5%, Zr:3.5～4.0%, Sn:2.0～2.5%, Mo:0.1～0.3%, Nb:0.6～0.9%, Si:0.3～0.4%, Nd:0.4～0.8%, surplus are Ti.
Further, the weight percent that adds element Nd is 0.4～0.6%.
600 ℃ of high-temperature titanium alloys that the present invention developed comprise Ti, Al, Zr, Sn, Mo, Nb, eight kinds of elements of Si, Nd, it is characterized in that: contain two kinds of β of Nb and Mo stable element mutually in the alloy, also added rare earth element nd simultaneously.Difference with the composition of existing 600 ℃ of high-temperature titanium alloys on this alloying element compositing characteristic is, two kinds of β phase stable elements and a kind of rare earth element do not occur adding simultaneously on existing 600 ℃ of high-temperature titanium alloys elementary composition, and added two kinds of β of Mo and Nb stable element and added a certain amount of rare earth element nd mutually among the present invention.On constituent content, titanium alloy system of the present invention adopts the high Zr of high Al to hang down Sn, and the composition proportion of low Mo and middle Nb, adds a spot of rare earth Nd in this new base alloy.Characteristics are, the low Sn combination of the high Zr of high Al guarantees the heat resistance of alloy, and Nb itself has the oxidation resistant effect of the alloy of making as a kind of weak β phase stable element, utilize the combination of low Mo and middle Nb better to guarantee the workability and the thermostability of alloy.The adding of rare earth Nd can be played the effect that the reinforced alloys matrix improves the alloy thermostability simultaneously.
The contriver draws the optimized choice for interalloy element of the present invention by the effect of each component in the high-temperature titanium alloy is furtherd investigate.Be how to select to determine that alloying constituent and effect thereof describe to the present invention below, all elemental compositions are all counted by weight percentage.
The present invention to Al, Mo, Nb, Nd the effect in titanium alloy carry out analysis-by-synthesis, obtain following constituent content and determine scheme:
Al is as the indispensable alloying element of high-temperature titanium alloy, and its effect is to strengthen the α phase, can effectively improve hot strength, and experience in the past thinks that the add-on of working as Al surpasses 6% meeting because of separating out α
2Cause alloy embrittlement mutually, reduce the alloy temperature-room type plasticity, promptly reduce thermostability, still a large amount of afterwards research is thought, separates out a spot of α in the alloy
2The phase disperse is distributed in the matrix also can play certain strengthening effect, for improving heat resistance (drag of wriggling change, tensile strength) certain help is arranged.And separate out α
2Also relevant with the content of the Zr that is added, Sn and oxygen impurities mutually, empirical evidence is worked as the alloying element that is added and is satisfied equivalent thickness of aluminium formula: [Al
EqComparatively suitable during]=%Al+1/3%Sn+1/6Zr+10%O≤9% (10%O can think equal 1).Therefore, the content range of the Al of alloy of the present invention is defined as 6.2～6.5%, and the content range of Zr and Sn is respectively and is adjusted into 3.5～4.0% and 2～2.5% simultaneously, has satisfied equivalent thickness of aluminium experimental formula.
In addition, Mo is respectively β stable element mutually with Nb, and wherein Mo is stronger β phase stable element, Nb a little less than.High-temperature titanium alloy of the present invention is nearly α type alloy, promptly mainly contains α and contains a spot of β phase when identical.The effect of β phase provides alloy certain toughness, workability.Mo can reduce the β phase transition temperature significantly, and solubleness is very little in α-Ti, therefore a large amount of Mo add affiliation cause occurring in the alloy a large amount of β mutually and strength degradation obvious.Nb is as weak β phase stable element, itself is bigger in the solubleness of α in mutually, and can improve the oxidation-resistance of alloy, this has good effect for the thermostability of improving high-temperature titanium alloy, but its add-on is also unsuitable too high, has research to think that the too high meeting of Nb add-on reduces the hot strength of alloy.This shows add simultaneously two kinds of β of Mo and Nb mutually stable element can offer certain workability of alloy and oxidation-resistance, comprehensive action is better.The present invention consider with its composition range determine Mo be 0.1～0.3% and Nb be 0.6～0.9% comparatively suitable.
The rare earth Nd element joins in the titanium alloy, can in fusion process, form a kind of rare earth phase of high-temperature stable, disperse is distributed in the alloy substrate, this rare earth phase particle is little, and is mainly elementary composition by containing aerobic (O), neodymium (Nd), three kinds in tin (Sn), when reducing matrix oxygen (O) and tin (Sn), reduce the alloy substrate mean electron concentration, reduce equivalent thickness of aluminium numerical value, thereby suppressed separating out in a large number of fragility phase, improved the alloy thermostability.The existence of this in addition rare earth phase can be played the crystal grain thinning effect, and the rare earth phase particle that disperse distributes can hinder crystal boundary motion, pinning dislocation, reinforced alloys matrix.The present invention determines the Nd composition range 0.4～0.8%, has obtained effect preferably.
High-temperature titanium alloy provided by the present invention melting in vacuum consumable electrode arc furnace strips off the skin ingot casting then, carries out cogging at the β phase region and forges; Under two-phase region, carry out finish forge, go out to handle through the two-phase region solid solution aging then, obtain to contain the bifurcation tissue of a certain amount of primary phase.Have higher room temperature, high temperature tensile strength, and be on close level with domestic and international similar alloy, have good plasticity, alloy of the present invention also shows thermostability preferably simultaneously.
Description of drawings
Fig. 1 Nd content is to alloy room temperature effects of tensile strength of the present invention.
The influence of the room temperature tensile plasticity after Fig. 2 Nd content exposes through 600 ℃/100h air heat alloy of the present invention.
Below in conjunction with the drawings and the specific embodiments the present invention is further described.The present invention is by changing the add-on of rare earth Nd, determines the optimum content of Nd from tensile property and thermostability; Investigate different Mo, Nb proportioning to the alloy Effect on Performance.
Embodiment
Embodiment 1
By following prescription: Al:6.2wt%, Zr:4.0wt%, Sn:2.5wt%, Mo:0.3wt%, Nb:0.9wt%, Si:0.35wt%, surplus is that Ti prepares burden, and wherein adds Nd content and is respectively (wt%): 0,0.4,0.6,0.8 four kinds of alloying constituent numberings are respectively: I, II, III, IV.With 0 grade of titanium sponge, high-purity Al, the Zr particle, TiSn, AlMo, AlNb, AlSi bits shape master alloy and high-purity N d powder, batch mixing is pressed into electrode, wherein consider shape and powder material to be worth doing and wrap up laggard column electrode compacting with high-purity aluminum foil, secondary smelting in vacuum consumable electrode arc furnace, finally obtain four weight and be about 5kg, diameter is the different ingot casting of the Nd amount that contains of the high 140mm of 120mm, to each ingot casting strip off the skin the back on average block into two joints along cylindrical cross-section, and all under 1100 ℃, carry out cogging and forge, upsetting pull becomes the length of side to be about 70 millimeters square billet repeatedly, under 980 ℃, square billet is pulled out again, obtain the bar that diameter is 20mm, air cooling.The heterogeneity that obtains is numbered I, II, III, the bar of IV is through 1000 ℃/1h, and the solution treatment of air cooling and 700 ℃/2h are after the ageing treatment of air cooling, the standard tensile sample of many cylindrical end headband screw threads is made in sampling, carries out room temperature, 600 ℃ of instantaneous stretching tests.And 600 ℃/100h air heat exposes the room temperature tensile test after handling.The stretching data see Table 2, wherein, and σ
bBe tensile strength, σ
sBe yield strength, A is a unit elongation, and Z is a relative reduction in area.
Table 2 alloy room temperature and high temperature tensile properties
As ise apparent from FIG. 1, alloy of the present invention has higher room temperature tensile strength and the yield strength of I alloy that does not contain Nd.From table 2 stretching data as can be known, alloy of the present invention has excellent room temperature and high temperature tensile properties, all reaches domestic and international similar alloy strength level.After can finding also that from table 2 four kinds of alloys expose processing through 600 ℃/100h air heat, tensile strength all obviously increases, but plasticity descends significantly, Fig. 2 shows, the stretching plastic of alloy II of the present invention and III descends less, and the II alloy plasticity loses less than 20%, has thermostability preferably, it is about 30% that the III alloy plasticity descends, and is lower than the plasticity loss of other similar horizontal high-temperature titanium alloys.As seen, when Nd content was between 0.4～0.6%, alloy of the present invention had better comprehensive performance.
Embodiment 2～4
The one-tenth of embodiment 2～4 is respectively in the table 3, is numbered V by composition in the table 3, VI, the composition proportion of VII is prepared burden, and carries out melting, processing and thermal treatment by the technology of embodiment 1, and 600 ℃/100h heat exposes, the tensile property of beta alloy, performance data sees Table 4.
Table 3
Table 4
From the alloy room temperature high temperature tensile properties of embodiment 2～4, and thermal stability numerical value as can be seen, and high-temperature titanium alloy of the present invention has heat resistance and thermostability preferably under 600 ℃.
Claims (2)
1. high-temperature titanium alloy, this alloy comprises Ti, Al, Zr, Sn and Si, it is characterized in that: also contain Nb, Mo, three kinds of elements of Nd in this alloy simultaneously, each composition and weight percent thereof are in the alloy: Al:6.2～6.5%, Zr:3.5～4.0%, Sn:2.0～2.5%, Mo:0.1～0.3%, Nb:0.6～0.9%, Si:0.3～0.4%, Nd:0.4～0.8%, surplus are Ti.
2. the described a kind of high-temperature titanium alloy of claim 1 is characterized in that: add element Nd weight percent be 0.4～0.6%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586647A (en) * | 2012-03-05 | 2012-07-18 | 北京工业大学 | Erbium-containing high-temperature titanium alloy and preparation process thereof |
| CN103409658A (en) * | 2013-07-09 | 2013-11-27 | 中国船舶重工集团公司第七二五研究所 | Weldable high-strength titanium alloy capable of resisting high temperature of 600 DEG C |
| CN104762524A (en) * | 2015-03-18 | 2015-07-08 | 沈阳市亨运达钛业开发有限公司 | Ultrahigh temperature titanium alloy and preparation method thereof |
| CN103572094B (en) * | 2012-07-19 | 2018-06-05 | Rti国际金属公司 | There is good oxidation resistance and the titanium alloy of high intensity at high temperature |
| CN108774702A (en) * | 2018-06-22 | 2018-11-09 | 广西趣创想创客空间管理有限责任公司 | A kind of high temperature oxidation resisting titanium alloy and preparation method thereof |
| CN114672694A (en) * | 2022-03-30 | 2022-06-28 | 北京工业大学 | Low-temperature rolling and heat treatment process of near-alpha type high-temperature titanium alloy |
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| US20020033717A1 (en) * | 2000-06-05 | 2002-03-21 | Aritsune Matsuo | Titanium alloy |
| CN101457313A (en) * | 2007-12-12 | 2009-06-17 | 北京有色金属研究总院 | High temperature titanium alloy containing rare-earth element |
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| US20020033717A1 (en) * | 2000-06-05 | 2002-03-21 | Aritsune Matsuo | Titanium alloy |
| CN101457313A (en) * | 2007-12-12 | 2009-06-17 | 北京有色金属研究总院 | High temperature titanium alloy containing rare-earth element |
Non-Patent Citations (1)
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586647A (en) * | 2012-03-05 | 2012-07-18 | 北京工业大学 | Erbium-containing high-temperature titanium alloy and preparation process thereof |
| CN102586647B (en) * | 2012-03-05 | 2014-06-25 | 北京工业大学 | Erbium-containing high-temperature titanium alloy and preparation process thereof |
| CN103572094B (en) * | 2012-07-19 | 2018-06-05 | Rti国际金属公司 | There is good oxidation resistance and the titanium alloy of high intensity at high temperature |
| CN108486409A (en) * | 2012-07-19 | 2018-09-04 | Rti国际金属公司 | Titanium alloy with good oxidation resistance and high intensity at high temperature |
| CN103409658A (en) * | 2013-07-09 | 2013-11-27 | 中国船舶重工集团公司第七二五研究所 | Weldable high-strength titanium alloy capable of resisting high temperature of 600 DEG C |
| CN103409658B (en) * | 2013-07-09 | 2016-04-13 | 中国船舶重工集团公司第七二五研究所 | A kind of resistance to 600 DEG C of high strength at high temperature can welding titanium alloy |
| CN104762524A (en) * | 2015-03-18 | 2015-07-08 | 沈阳市亨运达钛业开发有限公司 | Ultrahigh temperature titanium alloy and preparation method thereof |
| CN108774702A (en) * | 2018-06-22 | 2018-11-09 | 广西趣创想创客空间管理有限责任公司 | A kind of high temperature oxidation resisting titanium alloy and preparation method thereof |
| CN114672694A (en) * | 2022-03-30 | 2022-06-28 | 北京工业大学 | Low-temperature rolling and heat treatment process of near-alpha type high-temperature titanium alloy |
| CN114672694B (en) * | 2022-03-30 | 2022-08-16 | 北京工业大学 | Preparation method of near-alpha type high-temperature titanium alloy |
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Application publication date: 20110323 |