CN105803258A - High-strength high-toughness titanium alloy - Google Patents
High-strength high-toughness titanium alloy Download PDFInfo
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- CN105803258A CN105803258A CN201610244037.8A CN201610244037A CN105803258A CN 105803258 A CN105803258 A CN 105803258A CN 201610244037 A CN201610244037 A CN 201610244037A CN 105803258 A CN105803258 A CN 105803258A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C14/00—Alloys based on titanium
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Abstract
The invention discloses a high-strength high-toughness titanium alloy which comprises the following components by mass percent: 1.0% to 2.0% of vanadium/V, 1.0% to 2.0% of molybdenum/Mo, 1.5% to 2.5% of ferrum/Fe, 5.0% to 6.5% of aluminum/Al, 2.0% to 3.0% of niobium/Nb, 0.9% to 2.5% of zirconium/Zr, and the balance being titanium, wherein the content of impurities is required to be lower than 0.4%. compared with the prior art, the high-strength high-toughness titanium alloy has the characteristic that the dynamic load performance and hot strength performance are relatively good.
Description
Technical field
The invention belongs to titanium alloy technical field, particularly relate to a kind of high-strength high-ductility titanium alloy.
Background technology
Titanium alloy is to add other elementary composition alloys with titanium for base.Titanium has two kinds of paramorphs: less than 882 DEG C is close-packed hexagonal structure α titanium, and more than 882 DEG C is body-centred cubic β titanium.The impact of phase transition temperature can be divided three classes by alloying element according to them: 1. stable alpha phase, improve phase transition temperature element be α stable element, have aluminum, carbon, oxygen and nitrogen etc..Wherein aluminum is titanium alloy main alloy element, it to carrying heavy alloyed room temperature and elevated temperature strength, reduction proportion, increase elastic modelling quantity and have positive effect.2. stablize β phase, the element of reduction phase transition temperature is beta stable element, can divide again isomorphism and two kinds of eutectoid type.The former has molybdenum, vanadium etc.；The latter has chromium, manganese, copper, ferrum, silicon etc..3. phase transition temperature being affected little element is neutral element, has zirconium, stannum etc..Oxygen, nitrogen, carbon and hydrogen are the major impurities of titanium alloy.Oxygen and nitrogen have bigger dissolubility in α phase, titanium alloy is had and significantly strengthens effect, but make plasticity decline.Generally specify that in titanium, the content of oxygen and nitrogen is respectively 0.15～0.2% and less than 0.04～0.05%.Hydrogen dissolubility in α phase is only small, dissolves too much hydrogen and can produce hydride, make alloy become fragile in titanium alloy.In usual titanium alloy, hydrogen content controls below 0.015%.Hydrogen dissolving in titanium is reversible, it is possible to remove with vacuum annealing.Titanium is isomer, and fusing point is 1660 DEG C, is close-packed hexagonal lattice structure, is called α titanium when lower than 882 DEG C；In body-centered cubic character structure more than 882 DEG C, it is called β titanium.Utilize the different characteristics of the above two structure of titanium, add suitable alloying element so that it is phase transition temperature and divide content to change gradually mutually and obtain the titanium alloy (titaniumalloys) of different tissues.Under room temperature, titanium alloy has three kinds of matrix, and titanium alloy is also just divided into following three classes: α alloy, (alpha+beta) alloy and beta alloy.China represents with TA, TC, TB respectively.
Alpha titanium alloy: it is the single-phase alloy of α phase solid solution composition, whether at general temperature or at higher practical application temperature, is all α phase, tissue stabilization, wearability is higher than pure titanium, and oxidation resistance is strong.At the temperature of 500 DEG C～600 DEG C, still keeping its intensity and creep-resistant property, but can not carry out heat treatment reinforcement, room temperature strength is not high.
Beta-titanium alloy: it is the single-phase alloy of β phase solid solution composition, namely non-heat treatment has higher intensity, and after quenching, timeliness, alloy is further strengthened, and room temperature strength is up to 1372～1666MPa；But heat stability is poor, should not at high temperature use.
Alpha+beta titanium alloys: it is two-phase alloys, has good combination property, and structure stability is good, has good toughness, plasticity and Hot Deformation Performance, can carry out thermal pressure processing preferably, can carry out quenching, timeliness makes alloy strengthening.Intensity after heat treatment about improves 50%～100% than annealed condition；Elevated temperature strength is high, can long-term work at the temperature of 400 DEG C～500 DEG C, its heat stability is inferior to alpha titanium alloy.Three kinds of titanium alloys are most commonly used that alpha titanium alloy and alpha+beta titanium alloys；The machinability of alpha titanium alloy is best, and alpha+beta titanium alloys takes second place, and beta-titanium alloy is worst.Alpha titanium alloy code name is TA, and beta-titanium alloy code name is TB, and alpha+beta titanium alloys code name is TC.
At present, known titanium alloy, as: a kind of titanium alloy (U.S. Patent Publication No. № 5160554), the stabilizer that its chemical composition (% weight) is 1.5-3.5 α equivalent, the vanadium of 5-7 equivalent, the molybdenum of 5-7 equivalent, the ferrum of 5-7 equivalent, is wherein titanium.This alloy has higher intensity (reaching 1500 М П а) after hot intensive treatment. but it does not possess enough plasticity, and additionally its welding performance is bad；Another kind of titanium alloy (Russ P publication number № 2549804), its type is titanium-aluminum-vanadium-oxygen, and this Alloyapplication is in the production of armour material, and this alloy puies forward heavy alloyed viscosity and plasticity by oxygenation, but owing to its elastic modelling quantity is higher, cause that its power performance is bad；Another kind of titanium alloy (Russ P publication number № 1131234), its type is titanium-aluminum-molybdenum-vanadium-chromium-ferrum-zirconium, wherein also includes the hydrogen of higher content, nitrogen and silicon.This alloy can not weld, and its plasticity is on the low side simultaneously；Another kind of titanium alloy (Russ P publication number № 1508594), its type is titanium-aluminum-molybdenum-vanadium-chromium-tantalum-niobium, owing to adding the tantalum of high level in its alloy, adds the cost of alloy largely；Another kind of titanium alloy (Russ P publication number № 1593259), its type is titanium-aluminum-molybdenum-vanadium-zirconium-chromium-ferrum-silicon-nitrogen-hydrogen-Xi, owing to its alloy adding the stannum of 4%, improving while its calorific intensity, its weldability and welded reduction；Another kind of titanium alloy (U.S. Patent Publication No. № 5509979), it is a kind of titanium-aluminum-vanadium-ferrum-molybdenum class Type Titanium Alloy, adds 0.2% oxygen in the alloy separately.This alloy has higher hardness, is easier polishing, is suitable for the manufacture of souvenir, is not suitable for Welding Structure product；Another kind of titanium alloy (Ukraine patent publication No. № 7385), its type is titanium-aluminum-niobium-zirconium-ferroalloy.This kind of alloy has higher corrosion resistance, weldability, but its insufficient strength.
Therefore the weak point of prior art high strength titanium alloy to be elastic modelling quantity higher, this characteristic causes that its dynamic load(loading) performance is not enough, and its calorific intensity performance is also inadequate, and combination property is poor.
Summary of the invention
The present invention is directed to problem above and the high-strength high-ductility titanium alloy of a kind of dynamic load better performances and calorific intensity better performances is provided.
This invention address that the technical scheme used by problem above is: providing a kind of high strength titanium alloy, it includes the component of following mass percent:
Vanadium/V is 1.0%～2.0%, and molybdenum/Mo is 1.0%～2.0%, and ferrum/Fe is 1.5%～2.5%, and aluminum/Al is 5.0%～6.5%, and niobium/Nb is 2.0%～3.0%, and zirconium/Zr is 0.9%～2.5%, and all the other are titanium, it is desirable to impurity content is less than 0.4%.
After adopting above component proportion, in the reasonable situation of aluminum, ferrum, molybdenum and vanadium content in the alloy, they are effective Boosters, wherein aluminum is titanium alloy reinforcing agent most effective, generally the least expensive in titanium alloy, but when its content is more than 7%, will producing a kind of 3Al intermetallic material, this will drop low-alloyed plasticity；Molybdenum can the as-cast microstructure of refining alloy, its alloy intensity and plasticity impact；The determination of iron content is subject to the restriction of two factors, and one is in the impact on strength and stability of the β phase region, and two is the decline that may result in being formed ferrum element intermediate material and plasticity；Vanadium as stabilizer and hardening agent, can make titanium alloy have good ductility and plasticity in titanium alloy；And zirconium and niobium are neutral reinforcing agent, they can improve alloy strength, although performance is inconspicuous, but they can carry heavy alloyed impact viscosity, reduces elastic modelling quantity, this will demonstrate important performance advantage under Dynamic Loading, consider the high expensive of niobium, reduce its content in the alloy, and improve the content of zirconium simultaneously, thus being issued to good economy in the situation not reducing alloy property, and zirconium also acts as the effect of modifying agent of Metal with Fine Grain kernel structure in titanium alloy.Aluminium component has brought up to close to 7% in the present invention, and after other alloy is carried out reasonable disposition, the present invention is seen as alpha+beta titanium alloys from matrix, compared with prior art, the method have the advantages that
1, after the such component proportion of the present invention, performance is better while, eliminate chromium, and reduce the content of niobium, thus cost is greatly reduced.
2, alloy of the present invention and is strengthened under operating mode in heat under annealing operating mode, mean intensity reach 1100 М p а and more than, simultaneously the meansigma methods of elongation percentage is up to 11% more than (meansigma methods of prior art high-strength high-ductility titanium alloy elongation percentage about 8%), therefore there is higher physical property, high specific strength；And still possess higher mechanical performance and fatigue strength in high temperature environments, there is good dynamic load performance, calorific intensity performance and thermal fatigue strength, it is possible to be applied to space flight, aviation, naval construction, gun tube and other military equipment manufacture.
3, alloy of the present invention has very good hot-working character, it is possible to use rolling, forging or compacting carry out half-finished processing, therefore combination property is better.
As preferably, described ferrum/Fe is 2.2%～2.5%.
Described zirconium/Zr is 0.9%～2.0%.
Described molybdenum/Mo is 1.0%～1.5%.
Described aluminum/Al is 6.0%～6.5%.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described further.
A kind of high-strength high-ductility titanium alloy, it includes the component of following mass percent:
Vanadium/V is 1.0%～2.0%, and molybdenum/Mo is 1.0%～2.0%, and ferrum/Fe is 1.5%～2.5%, and aluminum/Al is 5.0%～6.5%, and niobium/Nb is 2.0%～3.0%, and zirconium/Zr is 0.9%～2.5%, and all the other are titanium, it is desirable to impurity content is less than 0.4%.
| Smelting number | Al (%) | V (%) | Fe (%) | Zr (%) | Nb (%) | Mo (%) |
| No. 1 | 5.4 | 1.9 | 1.9 | 1.3 | 2.65 | 1.5 |
| No. 2 | 6.0 | 1.0 | 1.5 | 0.9 | 2.0 | 1.0 |
| No. 3 | 5.6 | 1.53 | 2.07 | 0.91 | 2.5 | 1.23 |
| No. 4 | 5.0 | 1.6 | 2.2 | 1.5 | 3.0 | 1.5 |
| No. 5 | 5.6 | 1.83 | 2.07 | 1.09 | 2.40 | 1.23 |
| No. 6 | 6.5 | 2.0 | 2.5 | 2.5 | 2.5 | 2.0 |
The alloy vacuum arc furnace ignition of above-mentioned different component carries out melting, and after completing forging and rolling, the physical property test being correlated with, its result of the test is as follows:
Mechanical and physical performance under annealing operating mode
Mechanical and physical performance under hot intensive treatment operating mode
From above-mentioned test can be seen that mean intensity of the present invention reach 1100 М p а and more than, simultaneously the meansigma methods of elongation percentage is up to more than 11%, thus just really accomplishing the requirement of high toughness.
The present invention can use titanium sponge and polynary intermediate alloy, uses existing any method of smelting all can complete.
Above example is only presently preferred embodiments of the present invention, the present invention be not limited only to above example also allow for other structure change, all in rights to independence claimed range of the present invention change, all belong to scope.
Claims (5)
1. a high-strength high-ductility titanium alloy, it is characterised in that: it includes the component of following mass percent:
Vanadium/V is 1.0%～2.0%, and molybdenum/Mo is 1.0%～2.0%, and ferrum/Fe is 1.5%～2.5%, and aluminum/Al is 5.0%～6.5%, and niobium/Nb is 2.0%～3.0%, and zirconium/Zr is 0.9%～2.5%, and all the other are titanium, it is desirable to impurity content is less than 0.4%.
2. high-strength high-ductility titanium alloy according to claim 1, it is characterised in that: described ferrum/Fe is 2.2%～2.5%.
3. high-strength high-ductility titanium alloy according to claim 1, it is characterised in that: described zirconium/Zr is 0.9%～2.0%.
4. high-strength high-ductility titanium alloy according to claim 1, it is characterised in that: described molybdenum/Mo is 1.0%～1.5%.
5. high-strength high-ductility titanium alloy according to claim 1, it is characterised in that: described aluminum/Al is 6.0%～6.5%.
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| CN201610244037.8A CN105803258A (en) | 2016-04-18 | 2016-04-18 | High-strength high-toughness titanium alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107246069A (en) * | 2017-08-02 | 2017-10-13 | 谭颖 | One kind building truss structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1473533A (en) * | 2003-08-06 | 2004-02-11 | 朱妙道 | Titanium chopsticks |
| CN101148717A (en) * | 2007-04-12 | 2008-03-26 | 南昌航空工业学院 | High-performance yttrium-base heavy rare earth copper alloy die material and preparation method thereof |
| CN104169449A (en) * | 2012-01-12 | 2014-11-26 | 钛金属公司 | Titanium alloy with improved properties |
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- 2016-04-18 CN CN201610244037.8A patent/CN105803258A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1473533A (en) * | 2003-08-06 | 2004-02-11 | 朱妙道 | Titanium chopsticks |
| CN101148717A (en) * | 2007-04-12 | 2008-03-26 | 南昌航空工业学院 | High-performance yttrium-base heavy rare earth copper alloy die material and preparation method thereof |
| CN104169449A (en) * | 2012-01-12 | 2014-11-26 | 钛金属公司 | Titanium alloy with improved properties |
Non-Patent Citations (2)
| Title |
|---|
| V.M.ZAMKOV等: "Development of a new system of alloying of high-strength titanium alloys for welded structures", 《MATERIALS SCIENCE》 * |
| 师昌绪等: "《材料科学与工程手册（上卷）第6篇 金属材料篇》", 31 January 2004 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107246069A (en) * | 2017-08-02 | 2017-10-13 | 谭颖 | One kind building truss structure |
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Application publication date: 20160727 |