CN102329983A - Titanium alloy capable of resisting high temperature higher than 600 DEG C - Google Patents
Titanium alloy capable of resisting high temperature higher than 600 DEG C Download PDFInfo
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Abstract
The invention discloses a titanium alloy capable of resisting high temperature higher than 600 DEG C. The chemical elements of the titanium alloy are 5.5 to 7.0 percent by weight of Al, 2.5 to 4.0 percent by weight of Sn, 1.0 to 3.0 percent by weight of Zr, 1.0 to 3.0 percent by weight of Mo, 1.5 to 3.0 percent by weight of Nb, 0.10 to 0.40 percent by weight of Si, 0.05 to 1.0 percent by weight of Ce, 0.1 to 5.0 percent by weight of Ta, 0.1 to 2.0 percent by weight of C, 0.1 to 2.0 percent by weight of B and the balance of Ti and other inevitable impurities. The titanium alloy can be used under the temperature higher than 600 DEG C, and guarantees excellent mechanical properties under the high temperature at the same time.
Description
Technical field
The present invention relates to a kind of titanium alloy, relate in particular to a kind of resistant to elevated temperatures titanium alloy.
Background technology
Titanium alloy is widely used in aerospace field because of it has high specific tenacity.Since the eighties in 20th century, countries such as American and Britain, Russia successfully develop alloys such as Ti-1100, IMI834, BT36, and the use temperature of these titanium alloys reaches 550～600 ℃.Domestic Ti-600, the Ti-60 high-temperature titanium alloy that uses under 600 ℃ of temperature of also developing.
Along with the development of modern aerospace technology, the cry of high-temperature titanium alloy demand that is higher than 600 ℃ for use temperature is also increasingly high.It is the contradiction of the thermostability of alloy with heat resistance that development at present is higher than the subject matter that titanium alloy ran into of 600 ℃ of use temperatures; The wherein stability and the alloy surface problem of oxidation of the involved titanium alloy phase structure of thermostability are along with the rising of temperature seems more and more outstanding.
Publication number is CN1031721, and open day is on March 15th, 1989, and name is called the Chinese patent document of " a kind of heat-resistant titanium alloy "; And publication number is CN101050479; Open day is on October 10th, 2007; The related titanium alloy of Chinese patent document that name is called " a kind of high temperature, solid solution, strengthened, heat-resistant titanium alloy containing rare earth " has added rear earth element nd, yttrium respectively; Though can crystal grain thinning behind the adding REE, improve creep property, its use temperature still rests on 600 ℃, and its reason is to pursue intensity and the high-alloying taked; The probability that fragility was separated out mutually after alloy was worked long hours increases, and causes tissue unstable.In addition, the infiltration meeting of oxygen forms oxygen-rich layer at alloy surface under the high temperature, thereby causes alloy surface unstable.
Publication number is CN101074464; Open day is on November 21st, 2007; The related titanium alloy of Chinese patent document that name is called " composite heat-resisting enhance titanium alloy " has added rare-earth elements of lanthanum, boron; Make its use temperature can be higher than 600 ℃, but, cause the Drawing abillity variation after second of hard is introduced mutually because it is particle and staple fibre reinforced composite materials.Though it has better comprehensive performance being higher than 600 ℃, its processing interval is narrower, and hot processing temperature is higher, has increased the difficulty of processing of material, has also improved material cost.
Summary of the invention
The purpose of this invention is to provide a kind of anti-pyritous titanium alloy more than 600 ℃, this kind titanium alloy can use being higher than under 600 ℃ the high temperature, and under this use temperature, the mechanical property of titanium alloy is excellent, and has good formability.
According to above-mentioned purpose of the present invention, the present invention proposes a kind of anti-pyritous titanium alloy more than 600 ℃, and its chemical element quality per distribution ratio is:
Al:5.5%～7.0%, Sn:2.5%～4.0%, Zr:1.0%～3.0%; Mo:1.0%～3.0%, Nb:1.5%～3.0%, Si:0.10%～0.40%; Ce:0.05%～1.0%, Ta:0.1%～5.0%, C:0.1%～2.0%; B:0.1%～2.0%, surplus are Ti and other unavoidable impurities.
The composition principle of design of above-mentioned each chemical element is following:
Above-mentioned Al, Sn, Zr, Mo, Nb, Si element are high-temperature titanium alloy alloy element commonly used.In these elements, Al belongs to α phase stabilizing element; Mo, Nb, Si belong to β phase stabilizing element; Sn, Zr are neutral elements.
Al is a topmost alloy element in the high-temperature titanium alloy, and it mainly acts on: solution strengthening, the density that reduces alloy, raising recrystallize and transformation temperature.In addition, Al can also improve hydrogen in the solubleness of α in mutually, reduces because of hydrogenate and separates out the hydrogen embrittlement that causes.But the detrimental action of Al in high-temperature titanium alloy also clearly.According to the Ti-Al phasor, the limit of solubility of Al in Ti is 7.5wt%, and after the Al content among the Ti surpassed this value, alloy can be separated out hard crisp α in timeliness or high temperature use
2Phase, the plasticity and the fracture toughness property of infringement alloy.For fear of because of separating out excessive α
2Cause the embrittlement of alloy mutually, bring into play the solution strengthening effect of Al to greatest extent, the present invention is controlled at 5.5～7.0wt% with the Al constituent content.
Sn and Zr belong to neutral element in high-temperature titanium alloy, they mutually all have bigger solid solubility with β in mutually at α, and these two kinds of elements add with other elements can play the effect that replenishes reinforcement; Wherein Sn can also reduce the susceptibility of alloy to hydrogen embrittlement.Compare with the Al element, these two kinds of elements form α
2The proneness of phase is less.Their adding can significantly improve the hot strength of alloy under the condition that does not reduce the alloy temperature-room type plasticity.Therefore the present invention is controlled at 2.5～4.0wt% with the Sn constituent content; Zr content is controlled at 1.0～3.0wt%.
Mo and Nb are the most frequently used β stabilizing elements mutually, and they can significantly reduce alpha+beta/β critical transition temperature.Add a spot of Mo and Nb in the high-temperature titanium alloy, can at room temperature obtain a spot of β phase, make alloy have temperature-room type plasticity preferably, but too high Mo content can produce adverse influence to the structure stability of titanium alloy.Therefore, add the Nb element in the alloy, substitute the Mo element of part, can play multielement enhanced effect, the present invention is controlled at 1.0～3.0wt% with the Mo constituent content, and Nb content is controlled at 1.5～3.0wt%.
The Si element is crucial microalloying element in high-temperature titanium alloy.Solid solution attitude Si can form the solute atoms air mass with other alloying element, hinders dislocation motion, reduces the stacking fault energy of alloy, thereby reduces the mobility of dislocation under the high temperature, and restriction hands over slippage to take place, and improves the high temperature tensile strength and the creep property of alloy.But; The higher high-temperature titanium alloy of si content is in carrying out ageing treatment or use, and the Si element that surpasses solid solubility limit will be separated out with the form of silicide, and excessive silicide can cause alloy plasticity to descend; Crack growth rate increases, and reduces the low cycle fatigue property of alloy.Therefore, the present invention is controlled at 0.1～0.4wt% with Si content.
Except above-mentioned conventional alloying element, the present invention also with the second phase enhanced mode, has added rare earth element ce, and C, B, Ta element.
Ce is a surface active element, and it mainly acts on is crystal grain thinning, thereby promotes all even distribution that improves silicide of distortion, and the adding of Rare-Earth Ce can improve the crystal boundary diffusion activation energy, reduces the crystal boundary motion.The interior oxidation of Ce can reduce the oxygen level and the effective equivalent thickness of aluminium in the sosoloid, and the particle of oxide compound can produce effects such as dispersion-strengthened.Therefore, rare earth element ce at first is a kind of intensive reductor, can effectively capture the oxygen in the alloy, improves the mechanical property of alloy, improves the antioxidant property of alloy.Secondly, the oxide compound of Ce is a kind of high melting compound, and disperse plays strengthening effect when distributing, and can improve the high temperature instantaneous strength and the strength of alloy; Once more, the Ce element has been alleviated the instability problem of alloy structure with the surface to a certain extent.But add excessive Ce element, with forming bigger oxide particle, unfavorable on the contrary to alloy property, therefore, the present invention is controlled at 0.05～1.0wt%. with the Ce constituent content
The Ta metal has only a kind of body-centered cubic lattice, so it only forms continuous solid solution with having mutually isomorphous β-Ti, then forms limit solid solution with the α-Ti of close-packed hexagonal dot matrix.When elementary composition multicomponent alloys such as Ti and Nb, Ta, Mo, also will form polybasic β continuous solid solution and αYou Xian sosoloid.What elements such as Ti and Zr, Nb, Ta, Mo formed is substitutional solid solution, and the twisted degree of dot matrix is little, thus in the high sosoloid titanium alloy of this type alloying element content, not only can improve intensity, and can keep higher plasticity.But because the ratio of Ta is great, adding Ta content is high more, and the density that forms new alloy also can increase, and this is unfavorable for improving the specific tenacity of alloy.Therefore, the present invention is controlled at 0.1～5.0wt% with Ta content.
B and C join in the titanium alloy with the master alloy mode, and in fusion process, can form wild phase has TiB, TiC.Because TiB is the staple fibre shape, the crystalline structure that it is unique is easy to directional profile in titanium alloy, can bear load, thereby improves the performance of alloy; TiC is a particulate state, and uniform distribution in alloy plays strengthening effect.But the add-on of B and C element is wanted suitably, otherwise too much add-on forms the second thick phase easily, does not have strengthening effect, reduces alloy property on the contrary.Therefore, the present invention is controlled at 0.1～2.0wt% with B content, and C content is controlled at 0.1～2.0wt%.
Titanium alloy of the present invention has the following advantages than existing titanium alloy:
(1) its preparation method is simple: the titanium alloy course of processing of the present invention is simple, does not need special process or equipment, uses preparation equipment, the technology of conventional titanium alloy just can produce;
(2) its mechanical property is excellent, has stretching preferably more than 600 ℃;
(3) its good moldability: titanium alloy of the present invention is less 950～1050 ℃ of resistance to deformation, has superplastic ability preferably, is fit to the superplastic formation of special-shaped structural part, can satisfy the performance requriements of space flight industry to the high-temperature titanium alloy material.
Figure of description
Fig. 1 is the micro-organization chart of titanium alloy embodiment 1 of the present invention.
Shown in Figure 2 is the backscattered electron stereoscan photograph of titanium alloy embodiment 5 of the present invention.
Fig. 3 is the stress-strain curve of titanium alloy embodiment 5 of the present invention under differing temps.
Embodiment
Embodiment 1-5
During batch mixing, add required master alloy in proportion, rare earth element ce adds with Al-Ce master alloy form, and Ta adds with the master alloy mode, and C adds with Graphite Powder 99, and B is with B powder or B
4The C powder adds, and after thorough mixing is even, is pressed into electrode, in vacuum consumable electrode arc furnace, carries out three meltings.Through fast forging, footpath forging and rolling, obtain the titanium alloy rod bar that diameter is 25mm then.Table 1 is the chemical composition content table of each titanium alloy among the embodiment 1-5.
Table 1. (weight percent)
| Embodiment | Al | Sn | Zr | Mo | Nb | Si | Ce | Ta | | C | |
| 1 | 5.5 | 2.5 | 1.2 | 2.4 | 1.6 | 0.1 | 0.9 | 0.2 | 0.1 | 0.1 | |
| 2 | 5.8 | 3.5 | 2.5 | 2.8 | 1.9 | 0.1 | 0.08 | 4.8 | 2.0 | 2.0 | |
| 3 | 6.2 | 3.2 | 2.9 | 1.2 | 2.6 | 0.4 | 0.12 | 0.2 | 0.1 | 0.1 | |
| 4 | 6.5 | 4.0 | 1.8 | 1.5 | 2.9 | 0.4 | 0.6 | 4.8 | 2.0 | 2.0 | |
| 5 | 6.8 | 2.8 | 2.1 | 1.9 | 2.3 | 0.26 | 0.3 | 2.3 | 0.4 | 0.2 |
The contriver to embodiment 1-5 and as a comparison the trade mark of example be that the titanium alloy of IMI834 at room temperature with under 600～700 ℃ the use temperature has carried out mechanical property test respectively, test-results is seen table 2.
Table 2.
Can know by table 2; Titanium alloy of the present invention is being higher than under 600 ℃ the use temperature; Its tensile strength is up to 500～800MPa, than at present external 600 ℃ with the room temperature and the high temperature tensile properties of exemplary alloy all high, can satisfy and be higher than under 600 ℃ of temperature the more high performance requirement of material.In addition, the contriver at high temperature carries out thermal modeling test for embodiment 5, and the result is as shown in Figure 3, can find out that by Fig. 3 this titanium alloy is less 950～1050 ℃ of resistance to deformation.The contriver carries out tension test at 950～980 ℃ to the titanium alloy among the embodiment 5 simultaneously, proves that its unit elongation can reach 1000%, has superplastic ability preferably.
Shown in Figure 1 is the micro-organization chart of the titanium alloy of embodiment 1, as can be seen from the figure is distributed with the TiB and the granular TiC of undersized corynebacterium on the uniform microtexture of titanium alloy.
Shown in Figure 2 is the back scattering stereoscan photograph of titanium alloy among the embodiment 5, as can be seen from Figure 2 the TiB of undersized corynebacterium and granular TiC.The small sized particles that even dispersion distributes in this tissue can play strengthening effect to titanium alloy, improves the high temperature instantaneous strength of alloy, and can improve the resistance of oxidation of alloy.
Titanium alloy of the present invention is when being out of shape more than 950 ℃, and distortion is very easy to carry out, and does not crack, and is fit to the superplastic formation of special-shaped structural part, can satisfy the performance requriements of high-end industry such as space flight industry to the high-temperature titanium alloy material.
Be noted that above enumerate be merely specific embodiment of the present invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.
Claims (1)
1. anti-pyritous titanium alloy more than 600 ℃ is characterized in that its chemical element quality per distribution ratio is:
Al 5.5％～7.0％
Sn 2.5％～4.0％
Zr 1.0％～3.0％
Mo 1.0％～3.0％
Nb 1.5％～3.0％
C 0.1％～2.0％
Ce 0.05％～1.0％
Si 0.10％～0.40％
B 0.1％～2.0％
Ta 0.1％～5.0％
Surplus is Ti and other unavoidable impurities.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103555999A (en) * | 2013-11-06 | 2014-02-05 | 北京科技大学 | High-strength cast Ti-Si-Al-B-Zr base alloy |
| CN104532056A (en) * | 2014-12-08 | 2015-04-22 | 洛阳双瑞精铸钛业有限公司 | High temperature titanium alloy and preparation method thereof |
| CN105018793A (en) * | 2015-08-28 | 2015-11-04 | 西北有色金属研究院 | Heat-resistant Ti alloy |
| CN107058801A (en) * | 2017-03-09 | 2017-08-18 | 西北工业大学 | One kind is applied to 560 ~ 650 DEG C of cast titanium alloy |
| CN111020289A (en) * | 2019-12-18 | 2020-04-17 | 佛山科学技术学院 | Heat-resistant titanium alloy |
| CN111014651A (en) * | 2019-11-26 | 2020-04-17 | 中国科学院金属研究所 | Short fiber reinforced high-temperature titanium alloy powder for 700-750 ℃ and preparation thereof |
| CN112195363A (en) * | 2020-08-28 | 2021-01-08 | 中国科学院金属研究所 | High-strength titanium alloy for 500-600 ℃ and processing method thereof |
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|---|---|---|---|---|
| JPH04202729A (en) * | 1990-11-30 | 1992-07-23 | Daido Steel Co Ltd | Ti alloy excellent in heat resistance |
| CN101050496A (en) * | 2007-05-18 | 2007-10-10 | 西北有色金属研究院 | High temperature, solid solution, strengthened, heat-resistant titanium arroy |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH04202729A (en) * | 1990-11-30 | 1992-07-23 | Daido Steel Co Ltd | Ti alloy excellent in heat resistance |
| CN101050496A (en) * | 2007-05-18 | 2007-10-10 | 西北有色金属研究院 | High temperature, solid solution, strengthened, heat-resistant titanium arroy |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103555999A (en) * | 2013-11-06 | 2014-02-05 | 北京科技大学 | High-strength cast Ti-Si-Al-B-Zr base alloy |
| CN104532056A (en) * | 2014-12-08 | 2015-04-22 | 洛阳双瑞精铸钛业有限公司 | High temperature titanium alloy and preparation method thereof |
| CN105018793A (en) * | 2015-08-28 | 2015-11-04 | 西北有色金属研究院 | Heat-resistant Ti alloy |
| CN107058801A (en) * | 2017-03-09 | 2017-08-18 | 西北工业大学 | One kind is applied to 560 ~ 650 DEG C of cast titanium alloy |
| CN111014651A (en) * | 2019-11-26 | 2020-04-17 | 中国科学院金属研究所 | Short fiber reinforced high-temperature titanium alloy powder for 700-750 ℃ and preparation thereof |
| CN111020289A (en) * | 2019-12-18 | 2020-04-17 | 佛山科学技术学院 | Heat-resistant titanium alloy |
| CN112195363A (en) * | 2020-08-28 | 2021-01-08 | 中国科学院金属研究所 | High-strength titanium alloy for 500-600 ℃ and processing method thereof |
| CN112195363B (en) * | 2020-08-28 | 2022-05-10 | 中国科学院金属研究所 | High-strength titanium alloy for 500-600 ℃ and processing method thereof |
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Application publication date: 20120125 |