CN102605211A - Low density, high strength and high plasticity titanium alloy - Google Patents
Low density, high strength and high plasticity titanium alloy Download PDFInfo
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- CN102605211A CN102605211A CN2012100478334A CN201210047833A CN102605211A CN 102605211 A CN102605211 A CN 102605211A CN 2012100478334 A CN2012100478334 A CN 2012100478334A CN 201210047833 A CN201210047833 A CN 201210047833A CN 102605211 A CN102605211 A CN 102605211A
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Abstract
The invention relates to a low density, high strength and high plasticity titanium alloy. The technological key points are as follows: the titanium alloy comprises metal titanium as the main component, a small amount of metal aluminum, metal iron, metal vanadium, silicon element, and inevitable impurities. Because of adding the small amount of noble metal V with same crystal structure with the titanium and capable of playing the role in suppressing the crystal nucleation and refining the crystal grains, the alloy has relatively high plasticity in the situation of ensuring the high intensity. The added Al replaces the noble metal V and the titanium sponge, thus the cost of the alloy is reduced, the addition of the small amount of the Si element increases the strength and the oxidation resistance of the alloy, the processability of the alloy is good, the process steps are simple, the process cost is low, and the alloy is easily produced. The alloy meets the requirements of various application fields for the low cost, high strength and high plasticity titanium alloy.
Description
Technical field
The invention belongs to the titanium alloy technical field in the titanium metal.It is a kind of low-density and high-strength high-ductility titanium alloy.
Background technology
Titanium or titanium alloy is because of having specific tenacity height, anti-corrosion, many advantages such as thermotolerance is strong, and the application in every field is very extensive.Particularly some specific industries are all improving constantly the expensive low titanium alloy demand of intensity.
At present, the titanium alloy that simple closing aurification is strengthened, its room temperature tensile intensity generally is no more than 1000MPa, and high strength structure titanium alloy more then must thermal treatment improve intensity if desired.Typical heat treatment reinforcement alpha and beta type titan alloy Ti-6Al-4V, BT14, BT23; Nearly metastable beta-type titanium alloy BT22, Ti-10V-2Fe-3Al; Metastable beta-type titanium alloy BT15, Ti-8-8-2-3 and Ti-3-8-6-4-4 (β c), intensified process back draft intensity all can reach more than 1200 MPa, but general plasticity is very low; Alloy compositions is more, and tooling cost is high.From the needs that Application Areas is expanded, further improving the intensity of alloy and reducing cost becomes its important development trend.Generally, the intensity that improves metallic substance can be brought the loss of material plasticity or the raising of cost.The α stable element that increases in the alloy is one of effective ways that improve intensity.Add aluminium in the titanium just as adding carbon in the steel, play solution strengthening.Aluminium adds stable alpha phase in the titanium, and it has positive effect to normal temperature and hot strength, reduction proportion, the increase Young's modulus that improves alloy.Add Al when improving beta transus temperature, beta stable element is increased in the solubleness of α in mutually.But the Al content in the alloy generally can not surpass 9% (weight percent), because Al is not unlimited solid solution in titanium, when surpassing solubleness, will form TiAl (Ti
3Al) frangible compounds phase increases alloy fragility.Therefore Al content is chosen in 7.5%-8.5%.Same beta stable element also can play the effect of solution strengthening, thereby and can keep more metastable mutually so that when timeliness, decompose the raising precipitating reinforcing effect.Therefore when using eutectoid type element, the isomorphism beta stable element of generally should arranging in pairs or groups can reduce the possibility that fragility is separated out mutually like this.Beta stable element V has identical crystalline structure with Ti, and can promote the crystal forming core, suppresses grain growth, plays crystal grain thinning, improves plasticity and flexible effect.The Si element can improve the alloy high-temp creep-resistant property, improves the intensity under any temperature.The silicide particle that disperse distributes has iris action to the motion of dislocation.But silicide can produce sclerosis during the Si too high levels, increases the fragility of alloy material.Therefore Si content is controlled between the 0.20-0.25%, guarantees material property.
Summary of the invention
Technical problem to be solved by this invention is to overcoming titanium alloy keeping the unsettled deficiency of high-intensity while plasticity a kind of low-density and high-strength high-ductility titanium alloy to be provided.And under the situation that guarantees alloy high strength, still has titanium alloy than high-ductility.
The technical scheme that the present invention adopts is: a kind of low-density and high-strength high-ductility titanium alloy; The weight percent that it is characterized in that this alloying constituent consists of: Al:7.5%-8.5%; V:1.0%-1.5%, Si:0.2%-0.25%, surplus is Ti and unavoidable impurities.Said high-strength high-plasticity refers to that the Kang of alloy after simple annealing draws Qiang Du ≧ 1000Mpa, Yan Shen Shuais ≧ and 12%.
The working method of alloy of the present invention is to adopt Titanium Sponge 40-60 mesh, aluminum silicon alloy, fine aluminium, aluminum-vanadium alloy to mix the compacting electrode by design mix, casts alloy pig with conventional vacuum consumable electrode arc furnace secondary smelting;
The cogging under 1150 ℃ of-1200 ℃ of temperature of described alloy pig is forged, and the blank processing temperature is controlled at 900 ℃-1000 ℃, and the alloy finished product becomes the titanium alloy finished product after 770 ℃-860 annealing.Processing temperature is relatively low, can significantly cut down finished cost.
The present invention has the following advantages: because interpolation is a small amount of and titanium has same crystal structure, play the V that suppresses crystal forming core, crystal grain thinning effect, this alloy is guaranteeing to have higher plasticity under the high-intensity situation.The increase of Al has replaced precious metal V and Titanium Sponge 40-60 mesh; Cause cost of alloy to reduce, a small amount of Si element improves intensity and antioxidant property, and the processibility of alloy is good; The complete processing link is simple; Tooling cost is low, is easy to produce, and has been suitable for the requirement of each Application Areas to low-cost high-strength high-ductility titanium alloy.
To do further explain to the present invention through instance below, but following instance only is the present invention's example wherein, the rights protection scope of not representing the present invention and being limited, rights protection scope of the present invention is as the criterion with claims.
Embodiment:
Embodiment 1
At Al:7.5%-8.5%; V:1.0%-1.5% is mixed with six kinds of titanium alloys of heterogeneity in the composition range of Si:0.2%-0.25%, adopt the different complete processing of tradition to prepare titanium alloy plate respectively; Through following examples 1-6 particular embodiment, particular case is seen table 1 and table 2.
The concrete composition proportion of table 1 T91 alloy
| Sequence number | Fine aluminium/% | Vananum/% | Aluminum silicon alloy/% | Titanium Sponge 40-60 mesh/% |
| Embodiment 1 | 7.14 | 1.99 | 0.49 | 90.38 |
| Embodiment 2 | 6.84 | 1.99 | 0.49 | 90.68 |
| Embodiment 3 | 7.30 | 1.53 | 0.49 | 90.68 |
| Embodiment 4 | 7.60 | 1.53 | 0.49 | 90.38 |
| Embodiment 5 | 6.74 | 2.29 | 0.49 | 90.48 |
| Embodiment 6 | 7.44 | 1.99 | 0.49 | 90.08 |
Annotate: above proportioning is weight percentage
Adopt two kinds of different complete processing systems respectively with a kind of alloy; Integrate the composition proportion of gold in identical process system downward modulation; Final through 1200 ℃ of forgings of mechanical property contrast discovery Ti-8.4Al-1.0V-0.21Si warp; 990 ℃ rolling, when having higher-strength after 860 ℃ of anneal, keeping higher plasticity.
Table 2 T91 complete processing and mechanical property
The golf club production with the scope of attack of bulb is done bombard test for whether salable product.It is to be bottom line 4 times/second with ball speed that standard is bombarded test, and speed is by 6 times/second, 8 times/second ... Increase progressively, be as the criterion to bombarding not break for 2000 times; Titanium alloy material of the present invention is bombarded in the test at golf club; Undertaken by above test, bombard number of times 4300 times with the upper surface flawless, reached titanium alloy material and had the high-intensity while to reach; Have very high plasticity and toughness again, concrete data see table 3 for details.
Table 3 golf club material mechanical performance and bombard test contrast
Experiment shows: can find out that from the over-all properties of embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5 and embodiment 6 over-all properties of low-density and high-strength high-ductility titanium alloy of the present invention is following: σ
b : 960-1150MPa, σ
0.2 : 900-1080MPa, δ: ≧ 12%, ψ: ≧ 30%.Golf club is bombarded test more than 4100 times.
Claims (3)
1. low-density and high-strength high-ductility titanium alloy is characterized in that the weight percent of this alloying constituent consists of: Al:7.5%-8.5%, and V:1.0%-1.5%, Si:0.2%-0.25%, surplus is Ti, unavoidable impurities≤0.1%.
2. low-density and high-strength high-ductility titanium alloy according to claim 1 is characterized in that: said high-strength high-plasticity is meant that the Kang of alloy after annealing draws Qiang Du ≧ 1000Mpa, Yan Shen Shuais ≧ and 12%.
3. high-strength high-plasticity titanium alloy according to claim 1; It is characterized in that: the working method of alloy of the present invention is to adopt Titanium Sponge 40-60 mesh, aluminum silicon alloy, fine aluminium, aluminum-vanadium alloy to mix the compacting electrode by design mix, casts alloy pig with conventional vacuum consumable electrode arc furnace secondary smelting;
The cogging under 1150 ℃ of-1200 ℃ of temperature of described alloy pig is forged, and the blank processing temperature is controlled at 900 ℃-1000 ℃, and the alloy finished product becomes the titanium alloy finished product after 770 ℃-860 annealing.
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| CN2012100478334A CN102605211A (en) | 2012-02-29 | 2012-02-29 | Low density, high strength and high plasticity titanium alloy |
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| CN2012100478334A CN102605211A (en) | 2012-02-29 | 2012-02-29 | Low density, high strength and high plasticity titanium alloy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108754231A (en) * | 2018-08-31 | 2018-11-06 | 浙江申吉钛业股份有限公司 | Lightweight high-intensity high resiliency titanium alloy and its implementation |
| CN114381633A (en) * | 2022-02-11 | 2022-04-22 | 中南大学 | Titanium alloy and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101514411A (en) * | 2008-02-20 | 2009-08-26 | 明安国际企业股份有限公司 | Titanium aluminum alloy applied to golf club head |
| CN101906602A (en) * | 2010-09-10 | 2010-12-08 | 攀钢集团钢铁钒钛股份有限公司 | Method for processing metastable beta-type titanium alloy plate |
-
2012
- 2012-02-29 CN CN2012100478334A patent/CN102605211A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101514411A (en) * | 2008-02-20 | 2009-08-26 | 明安国际企业股份有限公司 | Titanium aluminum alloy applied to golf club head |
| CN101906602A (en) * | 2010-09-10 | 2010-12-08 | 攀钢集团钢铁钒钛股份有限公司 | Method for processing metastable beta-type titanium alloy plate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108754231A (en) * | 2018-08-31 | 2018-11-06 | 浙江申吉钛业股份有限公司 | Lightweight high-intensity high resiliency titanium alloy and its implementation |
| CN114381633A (en) * | 2022-02-11 | 2022-04-22 | 中南大学 | Titanium alloy and preparation method thereof |
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