CN104818408A - High-strength Ti-Al-Fe-Si alloy and preparation method thereof - Google Patents
High-strength Ti-Al-Fe-Si alloy and preparation method thereof Download PDFInfo
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- CN104818408A CN104818408A CN201510260738.6A CN201510260738A CN104818408A CN 104818408 A CN104818408 A CN 104818408A CN 201510260738 A CN201510260738 A CN 201510260738A CN 104818408 A CN104818408 A CN 104818408A
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 60
- 239000000956 alloy Substances 0.000 title claims abstract description 60
- 229910018191 Al—Fe—Si Inorganic materials 0.000 title claims abstract description 7
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052742 iron Inorganic materials 0.000 claims abstract description 16
- 229910052786 argon Inorganic materials 0.000 claims abstract description 13
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 7
- 239000010936 titanium Substances 0.000 claims description 28
- 229910052719 titanium Inorganic materials 0.000 claims description 25
- 238000002844 melting Methods 0.000 claims description 18
- 230000008018 melting Effects 0.000 claims description 18
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 13
- 229910018125 Al-Si Inorganic materials 0.000 claims description 9
- 229910018520 Al—Si Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 229910000676 Si alloy Inorganic materials 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 238000005339 levitation Methods 0.000 claims description 6
- 210000001161 mammalian embryo Anatomy 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000004411 aluminium Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 2
- 229910000883 Ti6Al4V Inorganic materials 0.000 abstract description 18
- 230000003647 oxidation Effects 0.000 abstract description 6
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- 238000003723 Smelting Methods 0.000 abstract 2
- 238000005242 forging Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000005070 sampling Methods 0.000 abstract 1
- 239000000725 suspension Substances 0.000 abstract 1
- 230000007306 turnover Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 229910001069 Ti alloy Inorganic materials 0.000 description 9
- 239000000470 constituent Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000005275 alloying Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention discloses a low-cost and high-strength Ti-Al-Fe-Si alloy, which comprises the following components in percentage by weight: 3-8% of Al, 1-6% of Fe, 0-2% of Si, no more than 0.5% of N, O, C, H and the balance of Ti. The invention uses cheap Fe and Si to replace V element in Ti-6Al-4V alloy, the strength can reach more than 1000MPa, and the cost is reduced by about 20%. Meanwhile, due to the addition of the Si element, the creep resistance and the oxidation resistance of the alloy are improved, and the applicability of the alloy in a high-temperature environment is improved. The preparation method comprises the following steps: adding raw materials into a cold crucible suspension smelting furnace protected by argon according to the designed alloy component proportion, performing turnover smelting for multiple times to obtain an ingot, forging the ingot into a bar blank, performing mechanical processing to prepare a bar, sampling the bar, performing heat treatment, and finally characterizing the performance of the bar.
Description
Technical field
The invention belongs to titanium alloy field, be specifically related to a kind of high strength Ti-Al-Fe-Si Alloy And Preparation Method.
Background technology
The density of titanium metal is less, is 4.5g/cm3, usually and aluminium, magnesium etc. be called as light metal, titanium alloy is the feature such as specific tenacity is high, solidity to corrosion good, thermotolerance is high, easy welding and be widely used in every field because having.
Titanium is originally a kind of very active metal, and its equilibrium potential is low, but has strong passivation tendency, and the avidity of oxygen is very high, can form rapidly the TiO of one deck densification, strong adhesion in atmosphere on surface
2film, thus protection matrix, make it not be corroded, also can rapid regeneration even if destroyed.Titanium has specific tenacity maximum in metal, and its alloy strength is suitable with iron and steel, and density only has 60% of iron and steel, uses titanium alloy as structured material, can alleviate its weight in a large number.Ti-6Al-4V is as titanium alloy the earliest, and use range is the most extensive.In recent years, Ti-6Al-4V, as a kind of light weight, high-strength, corrosion resistant excellent lightweight structural material, is further promoted in the application in space flight and aviation, naval vessel and the field such as civilian.But due to cost factor, although Ti-6Al-4V has a lot of successfully application case, its usage quantity is still very limited.Simultaneously because Ti-6Al-4V creep property is at high temperature general, and easily oxidized, and under part hot environment, result of use is not good.
According to the people such as Wu Huan " beta stable element is on the impact of titanium alloy α phase strengthening behavior ", the stability of beta stable element to β phase is stronger within the specific limits, and composition is that the tensile strength of the α ' alloy of Ti-Me and hardness are higher.And Fe is as a kind of eutectoid type beta stable element of being also eager to excel than Cr, the enhancing of its alloy is particularly evident.
In the people such as Seagle " Creep-resistant Titanium Alloys ", the research of Ti-6242 alloy is proved, add the creep-resistant property that appropriate silicon can strengthen alloy, possible explanation is because the main deformation mechanism of creep is climb of dislocation, and Si can form silicide and separates out in dislocation and hinder climb of dislocation under high temperature, thus carry heavy alloyed creep-resistant property.
The people such as D.B.Lee " Mechanical and oxidation properties of Ti – xFe-ySi alloys " study discovery, the oxidation rate of Ti-6Al-4V high temperature more than 700 degrees Celsius, far away higher than Ti-Fe-Si alloy, reasonably explains it is that Si is at high temperature oxidized generation SiO
2, and SiO
2thermal expansivity and fracture toughness property lower, the thin and zone of oxidation of densification can be formed, put forward heavy alloyed oxidation-resistance.
Publication number is CN101899590A, and denomination of invention is a kind of Chinese invention patent of titanium ferroaluminium, because containing aluminium in composition, hot workability is between the pure titanium of ASTM and Ti-6Al-4V, and fatigue strength is higher than Ti-6Al-4V.Have the hot workability that high strength titanium alloy is than ever more excellent, its tensile strength reaches 1000MPa, suitable with Ti-6Al-4V.Due in alloy not containing Si, its creep-resistant property and high-temperature oxidation resistance more weak.
Summary of the invention
The object of the present invention is to provide a kind of low cost, high performance Ti-Al-Fe-Si alloy, the V element replacing high price with Fe and Si of cheapness, reduces by the cost of about 20%, simultaneously improving SNR.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of low cost, high strength titanium ferro-aluminum silicon alloy, weight alloy percentage composition is: Al 3-8%, Fe 1-6%, Si 0-2%, and it is surplus that N, O, C, H total content is no more than 0.5%, Ti.
The present invention is because containing Fe in alloying element, and Fe is a kind of very strong beta stable element, compares Ti-6Al-4V and can promote alloy strength in right amount, and Ti-6Al-4V alloy basic mechanical performance is in table 1.Add Si element simultaneously and can form intermetallic compound Ti
5si
3, improve the creep-resistant property of alloy, the SiO generated when utilizing Si to be oxidized
2zone of oxidation, improves alloy high-temp oxidation-resistance.
The basic mechanical performance of table 1.Ti-6Al-4V alloy
According to another aspect of the present invention, the invention provides a kind of low cost, high strength titanium alloy preparation method, comprise the following steps:
The first step: point carry out proportioning sponge Ti, Fe grain, Al grain, Al-Si master alloy according to being predetermined to be of alloy, according to the weight of every ingot about 100g, the material prepared is put into cold crucible vacuum levitation melting stove, be evacuated to 2 × 10
-3pa; In stove, be filled with the high-purity argon gas (99.99%) of a certain amount of pressure, argon pressure scope is 0.4 ~ 0.6MPa, melting ten minutes.
Second step: by all alloys together melting 3 ~ 4 times, obtain the Ti-Al-Fe-Si alloy button ingot mixed.
3rd step: the alloy pig cast is forged into excellent embryo, makes the bar of Φ 12mm through mechanical workout.
4th step: the bar obtained is annealed 790 DEG C of insulations for 2 hours.
5th step: Elongation test and creep test will be carried out through heat treated bar, and obtain corresponding mechanical property and creep property.
Compared with prior art tool of the present invention has the following advantages:
The present invention, while guarantee alloy ductility and Ti-6Al-4V alloy phase are worked as, improves the intensity of 10%, reduces the cost of 20%, enhance the creep-resistant property of alloy.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.
Embodiment 1
The present invention prepares the purity of each metal constituent element that titanium ferro-aluminum silicon alloy is selected as table 2, and alloying constituent by weight percentage composition is: it is surplus that Al 8%, Fe 2%, Si 0.5%, N, O, C, H total content are no more than 0.5%, Ti.
Point carry out proportioning sponge Ti, Fe grain, Al grain, Al-Si master alloy according to being predetermined to be of alloy, according to the weight of every ingot about 100g, the material prepared is put into cold crucible vacuum levitation melting stove, be evacuated to 2 × 10
-3pa; In stove, be filled with the high-purity argon gas (99.99%) of a certain amount of pressure, argon pressure scope is 0.4 ~ 0.6MPa, melting ten minutes.
By all alloys together melting 3 ~ 4 times, obtain the alloy button ingot mixed.
The alloy pig cast is forged into excellent embryo, makes the bar of Φ 12mm through mechanical workout.
By the bar that obtains in 790 DEG C of insulations annealing in 2 hours, be respectively 1120MPa and 1.5% to the mechanical properties of alloy and elongation at break.
The purity (%) that master alloy ingot selects metal constituent element prepared by table 2
Embodiment 2
The low cost, the high strength titanium ferro-aluminum silicon alloy that adopt the method identical with embodiment 1 to obtain, is characterized in that weight percent consists of: it is surplus that Al 6%, Fe 1%, Si 0.25%, N, O, C, H total content are no more than 0.5%, Ti.
Point carry out proportioning sponge Ti, Fe grain, Al grain, Al-Si master alloy according to being predetermined to be of alloy, according to the weight of every ingot about 100g, the material prepared is put into cold crucible vacuum levitation melting stove, be evacuated to 2 × 10
-3pa; In stove, be filled with the high-purity argon gas (99.99%) of a certain amount of pressure, argon pressure scope is 0.4 ~ 0.6MPa, melting ten minutes.
By all alloying constituents together melting 3 ~ 4 times, obtain the alloy button ingot mixed.
The alloy pig cast is forged into excellent embryo, makes the bar of Φ 12mm through mechanical workout.
Within 2 hours, annealed 790 DEG C of insulations by the bar obtained, the mechanical properties and the elongation at break that obtain alloy are respectively 1080MPa and 13.1%.500 DEG C, do creep test under 85MPa pulling force, its creep speed is 1.56 × 10
-4%.
Embodiment 3
The low cost, the high strength titanium ferro-aluminum silicon alloy that adopt the method identical with embodiment 1 to obtain, is characterized in that weight percent consists of: it is surplus that Al 4%, Fe 4%, Si 2%, N, O, C, H total content are no more than 0.5%, Ti.
Point carry out proportioning sponge Ti, Fe grain, Al grain, Al-Si master alloy according to being predetermined to be of alloy, according to the weight of every ingot about 100g, the material prepared is put into cold crucible vacuum levitation melting stove, be evacuated to 2 × 10
-3pa; In stove, be filled with the high-purity argon gas (99.99%) of a certain amount of pressure, argon pressure scope is 0.4 ~ 0.6MPa, melting ten minutes.
By all alloying constituents together melting 3 ~ 4 times, obtain the alloy button ingot mixed.
The alloy pig cast is forged into excellent embryo, makes the bar of Φ 12mm through mechanical workout.
Within 2 hours, annealed 790 DEG C of insulations by the bar obtained, the mechanical properties and the elongation at break that obtain alloy are respectively 960MPa and 3.5%.
Embodiment 4
The low cost, the high strength titanium ferro-aluminum silicon alloy that adopt the method identical with embodiment 1 to obtain, is characterized in that weight percent consists of: it is surplus that Al 3%, Fe 6%, Si 0.1%, N, O, C, H total content are no more than 0.5%, Ti.
Point carry out proportioning sponge Ti, Fe grain, Al grain, Al-Si master alloy according to being predetermined to be of alloy, according to the weight of every ingot about 100g, the material prepared is put into cold crucible vacuum levitation melting stove, be evacuated to 2 × 10
-3pa; In stove, be filled with the high-purity argon gas (99.99%) of a certain amount of pressure, argon pressure scope is 0.4 ~ 0.6MPa, melting ten minutes.
By all alloying constituents together melting 3 ~ 4 times, obtain the alloy button ingot mixed.
The alloy pig cast is forged into excellent embryo, makes the bar of Φ 12mm through mechanical workout.
Within 2 hours, annealed 790 DEG C of insulations by the bar obtained, the mechanical properties and the elongation at break that obtain alloy are respectively 980MPa and 14.5%.500 DEG C, do creep test under 85MPa pulling force, its creep speed is 1.35 × 10
-4%.
Experiment proves that the intensity of Ti-6Al-4Fe-0.25Si reaches 1080MPa, and intensity comparatively Ti-6Al-4V slightly promotes, and its elongation at break is 13.1%, and Ti-6Al-4V is suitable, and hot workability is close with it.The intensity of Ti-4Al-2Fe-0.1Si alloy is 980MPa, and Ti-6Al-4V is close, but elongation at break is 14.5%, and comparatively Ti-6Al-4V increases, and hot workability is better, and creep speed comparatively 1.35 × 10
-4%, lower than 1.56 × 10 of Ti-6Al-4Fe-0.25Si
-4%, more lower than Ti-6Al-4V, creep-resistant property is better, applies under being adapted at part hot environment.The present invention, mainly in order to reduce the cost of titanium alloy, makes its usage quantity expand further, especially in the environment that working temperature is higher.
Although describe embodiments of the present invention in detail, it should be understood that when without departing from the spirit and scope of the present invention, various change, replacement and change can be made to embodiments of the present invention.
Claims (2)
1. a low cost, high strength titanium ferro-aluminum silicon alloy, it is characterized in that: described alloy with weight percentage, by Al 3-8%, Fe 1-6%, Si 0-2%, it is surplus composition that N, O, C, H total content is no more than 0.5%, Ti, and described titanium elements is provided by sponge Ti, ferro element is provided by Fe grain, element silicon is provided by Al-Si master alloy, and aluminium element is provided by Al grain and Al-Si master alloy, and Al-Si master alloy used is Al
60si
40.
2. a preparation method for low cost, high strength titanium ferro-aluminum silicon alloy, is characterized in that: comprise the following steps:
The first step: point carry out proportioning sponge Ti, Fe grain, Al grain, Al-Si master alloy according to being predetermined to be of alloy, the material prepared is put into cold crucible vacuum levitation melting stove by the weight according to every ingot about 100g, is evacuated to 2 × 10
-3pa; In stove, be filled with the high-purity argon gas of a certain amount of pressure, argon pressure scope is 0.4 ~ 0.6MPa, melting ten minutes;
Second step: by all alloys together melting 3 ~ 4 times, obtain the Ti-Al-Fe-Si alloy button ingot mixed;
3rd step: the alloy pig cast is forged into excellent embryo, makes the bar of Φ 12mm through mechanical workout;
4th step: the bar obtained is annealed 790 DEG C of insulations for 2 hours;
5th step: Elongation test and creep test will be carried out through heat treated bar, and obtain corresponding mechanical property and creep property.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105088014A (en) * | 2015-09-15 | 2015-11-25 | 北京工业大学 | Low-cost and high-strength Ti-Fe alloy billet and preparing technology thereof |
| CN105624466A (en) * | 2016-01-26 | 2016-06-01 | 安徽同盛环件股份有限公司 | Thin-wall titanium alloy ring piece and forging molding method thereof |
| CN107723514A (en) * | 2017-10-14 | 2018-02-23 | 周书平 | A kind of titanium alloy plate |
| CN108149064A (en) * | 2017-12-19 | 2018-06-12 | 燕山大学 | A kind of high-strength high-plastic titanium ferro-aluminum silicon-carbon alloy |
| CN109487120A (en) * | 2018-12-07 | 2019-03-19 | 中国石油天然气集团有限公司 | A kind of graphene enhances 1200MPa grades of titanium alloy drilling rod titanium alloys and its tubing manufacturing method |
| CN109778049A (en) * | 2019-03-04 | 2019-05-21 | 南京理工大学 | A method of preparing titan alloy casting ingot |
| CN110846534A (en) * | 2019-11-05 | 2020-02-28 | 西安西工大超晶科技发展有限责任公司 | Low-cost medium-high-strength titanium alloy material and preparation method of bar thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105088014A (en) * | 2015-09-15 | 2015-11-25 | 北京工业大学 | Low-cost and high-strength Ti-Fe alloy billet and preparing technology thereof |
| CN105624466A (en) * | 2016-01-26 | 2016-06-01 | 安徽同盛环件股份有限公司 | Thin-wall titanium alloy ring piece and forging molding method thereof |
| CN107723514A (en) * | 2017-10-14 | 2018-02-23 | 周书平 | A kind of titanium alloy plate |
| CN107723514B (en) * | 2017-10-14 | 2019-09-20 | 河北纵横集团丰南钢铁有限公司 | A kind of titanium alloy plate |
| CN108149064A (en) * | 2017-12-19 | 2018-06-12 | 燕山大学 | A kind of high-strength high-plastic titanium ferro-aluminum silicon-carbon alloy |
| CN109487120A (en) * | 2018-12-07 | 2019-03-19 | 中国石油天然气集团有限公司 | A kind of graphene enhances 1200MPa grades of titanium alloy drilling rod titanium alloys and its tubing manufacturing method |
| CN109778049A (en) * | 2019-03-04 | 2019-05-21 | 南京理工大学 | A method of preparing titan alloy casting ingot |
| CN110846534A (en) * | 2019-11-05 | 2020-02-28 | 西安西工大超晶科技发展有限责任公司 | Low-cost medium-high-strength titanium alloy material and preparation method of bar thereof |
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Application publication date: 20150805 Assignee: Jiangsu Xiangyun Titanium Alloy New Materials Co.,Ltd. Assignor: Nanjing Tech University Contract record no.: X2024980000992 Denomination of invention: A high-strength Ti Al Fe Si alloy and its preparation method Granted publication date: 20170815 License type: Common License Record date: 20240119 |
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