CN103276242A - Ultrahigh-strength titanium alloy and preparation method thereof - Google Patents
Ultrahigh-strength titanium alloy and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an ultrahigh-strength titanium alloy and a preparation method thereof, and aims to solve the problem that the existing high-strength titanium alloy can not have high strength and high ductility simultaneously. The ultrahigh-strength titanium alloy comprises Al, Mo, V, Cr, Sn, Fe and the balance of Ti and inevitable impurities in certain percentage by weight. The preparation method comprises the following steps: 1, weighing all the components; 2, preparing a monoblock electrode; 3, preparing a consumable electrode; 4, preparing a cast ingot; 5, preparing a forging blank; and 6, performing upsetting and finish-forging to obtain the ultrahigh-strength titanium alloy. According to the invention, after the ultrahigh-strength titanium alloy is subjected to solid solution and aging, the strength and ductility can be as follows: the tensile strength is up to 1496 MPa, the elongation percentage is 14.5%, and the percentage reduction in area is 20.77%. The invention can be used for preparation of the ultrahigh-strength titanium alloy.
Description
Technical field
The present invention relates to a kind of superhigh intensity titanium alloy and preparation method thereof.
Background technology
High-strength titanium alloy refers to that room temperature strength is greater than the titanium alloy of 1100MPa after Overheating Treatment, have intensity high in, also have characteristics such as good plasticity and toughness, solidity to corrosion be good, mainly be used to substitute high-strength steel as the structured material in the aerospace flight vehicle, and spring material, be one of main direction of studying of various countries' titanium alloy, wherein developed in this regard early with the U.S. and Russia especially.In recent years, the application percentage of titanium alloy in aerospace field strengthens gradually, high-strength titanium alloy is also developed and application thereupon faster, as U.S. Boeing company 737,747 and 757 on use the Ti-1023 high-strength titanium alloy to prepare aircraft wing engine nacelle joint, landing gear connecting rod, shaft bearing housing and auxiliary flap slide rail in succession, used BT22 high-strength titanium alloy etc. on the large-scale load-carrying member of Muscovite Ilyushin 76,86,96, peace 124 and airframe such as Figure 20 4 and landing gear and the parts.Along with the development of aerospace cause, the high strength titanium alloy material is had higher requirement, need further to improve specific tenacity and the specific rigidity of titanium alloy, to realize bigger weight loss effect.Yet high-strength titanium alloy can be cost to sacrifice its plasticity when improving its intensity, as being example with present state-of-the-art Ti-5553 titanium alloy, and when its intensity reaches 1500MPa, several flat plasticity that do not have.
Summary of the invention
The present invention will solve existing high-strength titanium alloy not possess the problem of high strength and high-ductility simultaneously, and a kind of superhigh intensity titanium alloy and preparation method thereof is provided.
A kind of superhigh intensity titanium alloy of the present invention is that Ti and unavoidable impurities are formed by 3.0%～5.0% Al, 4%～6% Mo, 5%～7% V, 2%～4% Cr, 1%～3% Sn, 0.5%～1% Fe, surplus by weight percentage.
The preparation method of above-mentioned superhigh intensity titanium alloy, carry out according to the following steps:
One, take by weighing each component: by the weight percent of each element consist of 3.0%～5.0% Al, 4%～6% Mo, 5%～7% V, 2%～4% Cr, 1%～3% Sn, 0.5%～1% Fe, surplus is that Ti and unavoidable impurities take by weighing titanium sponge, rafifinal, pure chromium, pure tin, aluminium molybdenum alloy, aluminum-vanadium alloy and iron nail respectively as raw material; Two, preparation monolithic electrode: the feedstock production of step 1 is become the monolithic electrode; Three, preparation consumable electrode: monolithic electrode assembly welding in vacuum welding equipment of step 2 preparation is become consumable electrode; Four, preparation ingot casting: the consumable electrode of step 3 preparation is carried out twice melting be prepared into ingot casting in vacuum consumable electrode arc furnace; Five, preparation forging stock: ingot casting 150 ℃～200 ℃ coggings forgings more than alpha+beta/beta transformation point of step 4 preparation are prepared into forging stock; Six, pier pull out, finish-forging: with the forging stock of step 5 preparation alpha+beta/beta transformation point up and down 50 ℃～100 ℃ carry out two to three fire time repeatedly piers pull out, then alpha+beta/beta transformation point up and down 0 ℃～100 ℃ carry out finish-forging, namely obtain superhigh intensity titanium alloy.
Superhigh intensity titanium alloy of the present invention is the Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe alloy, and this alloy belongs to nearly beta titanium alloy, and alloy name Mo equivalent is that 11.43, β stability factor is 1.43.
It is 1496MPa that superhigh intensity titanium alloy of the present invention intensity plasticity coupling after solid solution and timeliness can reach tensile strength, and unit elongation is 14.5%, and relative reduction in area is 20.77%.
Superhigh intensity titanium alloy of the present invention maximum pulling strength after through (alpha+beta) two-phase region solid solution and 400 ℃ of timeliness thermal treatment can reach 1829MPa, unit elongation 2.7%.
Embodiment
Embodiment one: a kind of superhigh intensity titanium alloy of present embodiment is that Ti and unavoidable impurities are formed by 3.0%～5.0% Al, 4%～6% Mo, 5%～7% V, 2%～4% Cr, 1%～3% Sn, 0.5%～1% Fe, surplus by weight percentage.
The described inevitable impurity of present embodiment is O, H, N, C, Si etc., O≤0.1% wherein, C≤0.08%, H≤0.0005%, N≤0.02%.
The described superhigh intensity titanium alloy of present embodiment is the Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe alloy, and this alloy belongs to nearly beta titanium alloy, and alloy name Mo equivalent is that 11.43, β stability factor is 1.43.
It is 1496MPa that the described superhigh intensity titanium alloy of present embodiment intensity plasticity coupling after solid solution and timeliness can reach tensile strength, and unit elongation is 14.5%, and relative reduction in area is 20.77%.
The maximum pulling strength of the described superhigh intensity titanium alloy of present embodiment after through (alpha+beta) two-phase region solid solution and 400 ℃ of timeliness thermal treatment can reach 1829MPa, unit elongation 2.7%.
Embodiment two: what present embodiment and embodiment one were different is: superhigh intensity titanium alloy is that Ti and unavoidable impurities are formed by 4.0%～5.0% Al, 4.5%～6% Mo, 6%～7% V, 3%～4% Cr, 2%～3% Sn, 0.5%～1% Fe, surplus by weight percentage.Other is identical with embodiment one.
The described inevitable impurity of present embodiment is O, H, N, C, Si etc., O≤0.1% wherein, C≤0.08%, H≤0.0005%, N≤0.02%.
Embodiment three: what present embodiment was different with embodiment one or two is: superhigh intensity titanium alloy is that Ti and unavoidable impurities are formed by 4.0% Al, 5% Mo, 6% V, 3% Cr, 2% Sn, 0.5% Fe, surplus by weight percentage.Other is identical with embodiment one or two.
The described inevitable impurity of present embodiment is O, H, N, C, Si etc., O≤0.1% wherein, C≤0.08%, H≤0.0005%, N≤0.02%.
Embodiment four: the preparation method of a kind of superhigh intensity titanium alloy of present embodiment, carry out according to the following steps:
One, take by weighing each component: by the weight percent of each element consist of 3.0%～5.0% Al, 4%～6% Mo, 5%～7% V, 2%～4% Cr, 1%～3% Sn, 0.5%～1% Fe, surplus is that Ti and unavoidable impurities take by weighing titanium sponge, rafifinal, pure chromium, pure tin, aluminium molybdenum alloy, aluminum-vanadium alloy and iron nail respectively as raw material; Two, preparation monolithic electrode: the feedstock production of step 1 is become the monolithic electrode; Three, preparation consumable electrode: monolithic electrode assembly welding in vacuum welding equipment of step 2 preparation is become consumable electrode; Four, preparation ingot casting: the consumable electrode of step 3 preparation is carried out twice melting be prepared into ingot casting in vacuum consumable electrode arc furnace; Five, preparation forging stock: ingot casting 150 ℃～200 ℃ coggings forgings more than alpha+beta/beta transformation point of step 4 preparation are prepared into forging stock; Six, pier pull out, finish-forging: with the forging stock of step 5 preparation alpha+beta/beta transformation point up and down 50 ℃～100 ℃ carry out two to three fire time repeatedly piers pull out, then alpha+beta/beta transformation point up and down 0 ℃～100 ℃ carry out finish-forging, namely obtain superhigh intensity titanium alloy.
The described inevitable impurity of present embodiment described in the present embodiment step 1 is O, H, N, C, Si etc., O≤0.1% wherein, C≤0.08%, H≤0.0005%, N≤0.02%.
The superhigh intensity titanium alloy of present embodiment preparation is the Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe alloy, and this alloy belongs to nearly beta titanium alloy, and alloy name Mo equivalent is that 11.43, β stability factor is 1.43.
It is 1496MPa that the superhigh intensity titanium alloy of present embodiment preparation intensity plasticity coupling after solid solution and timeliness can reach tensile strength, and unit elongation is 14.5%, and relative reduction in area is 20.77%.
The maximum pulling strength of the superhigh intensity titanium alloy of present embodiment preparation after through (alpha+beta) two-phase region solid solution and 400 ℃ of timeliness thermal treatment can reach 1829MPa, unit elongation 2.7%.
Embodiment five: what present embodiment and embodiment four were different is: in the step 1 by the weight percent of each element consist of 4.0%～5.0% Al, 4.5%～6% Mo, 6%～7% V, 3%～4% Cr, 2%～3% Sn, 0.5%～1% Fe, surplus is that Ti and unavoidable impurities take by weighing titanium sponge, rafifinal, pure chromium, pure tin, aluminium molybdenum alloy, aluminum-vanadium alloy and iron nail respectively as raw material.Other is identical with embodiment four.
The described inevitable impurity of present embodiment is O, H, N, C, Si etc., O≤0.1% wherein, C≤0.08%, H≤0.0005%, N≤0.02%.
Embodiment six: what present embodiment was different with embodiment four or five is; In the step 1 by the weight percent of each element consist of 4.0% Al, 5% Mo, 6% V, 3% Cr, 2% Sn, 0.5% Fe, surplus is that Ti and unavoidable impurities take by weighing titanium sponge, rafifinal, pure chromium, pure tin, aluminium molybdenum alloy, aluminum-vanadium alloy and iron nail respectively as raw material.Other is identical with embodiment four or five.
The described inevitable impurity of present embodiment is O, H, N, C, Si etc., O≤0.1% wherein, C≤0.08%, H≤0.0005%, N≤0.02%.
Embodiment seven: what present embodiment was different with one of embodiment four to six is: ingot casting 160 ℃～200 ℃ coggings forgings more than alpha+beta/beta transformation point with the step 4 preparation in the step 5 are prepared into forging stock.Other is identical with one of embodiment four to six.
Adopt following verification experimental verification effect of the present invention:
Test one: a kind of preparation method of superhigh intensity titanium alloy, carry out according to the following steps:
One, take by weighing each component: by the weight percent of each element consist of 4% Al, 5% Mo, 6% V, 3% Cr, 2% Sn, 0.5% Fe, surplus is that Ti and unavoidable impurities take by weighing titanium sponge, rafifinal, pure chromium, pure tin, aluminium molybdenum alloy, aluminum-vanadium alloy and iron nail respectively as raw material; Two, preparation monolithic electrode: the feedstock production of step 1 is become the monolithic electrode; Three, preparation consumable electrode: monolithic electrode assembly welding in vacuum welding equipment of step 2 preparation is become consumable electrode; Four, preparation ingot casting: the consumable electrode of step 3 preparation is carried out twice melting be prepared into ingot casting in vacuum consumable electrode arc furnace; Five, preparation forging stock: the ingot casting of step 4 preparation is prepared into forging stock 980 ℃ of coggings forgings; Six, pier pull out, finish-forging: with the forging stock of step 5 preparation alpha+beta/beta transformation point up and down 50 ℃～100 ℃ carry out three fire time repeatedly piers pull out, carry out finish-forging and finishing becomes diameter 80mm bar at 780 ℃ then, namely obtain superhigh intensity titanium alloy.
Inevitable impurity described in this testing sequence one is O, H, N, C, Si etc., O≤0.1% wherein, C≤0.08%, H≤0.0005%, N≤0.02%.
The chemical ingredients of this testing sequence four described ingot castings is as shown in table 1:
Table 1
The partial properties of superhigh intensity titanium alloy after different solid solubility temperature thermal treatments of this test preparation is as shown in table 2:
Table 2
The superhigh intensity titanium alloy of this test preparation is through the partial properties of timeliness after 8 hours under the different aging temps after 800 ℃ of solid solutions, and is as shown in table 3:
Table 3
The superhigh intensity titanium alloy of this test preparation is as shown in table 4 through 800 ℃ of solid solutions and the partial properties behind different aging times under 560 ℃:
Table 4
Show excellent intensity after the superhigh intensity titanium alloy process solid-solution and aging heat treatment of the present invention's preparation, and good intensity plasticity coupling is arranged under high strength.
Claims (7)
1. superhigh intensity titanium alloy is characterized in that superhigh intensity titanium alloy is that Ti and unavoidable impurities are formed by 3.0%～5.0% Al, 4%～6% Mo, 5%～7% V, 2%～4% Cr, 1%～3% Sn, 0.5%～1% Fe, surplus by weight percentage.
2. superhigh intensity titanium alloy, tool are characterised in that superhigh intensity titanium alloy is that Ti and unavoidable impurities are formed by 4.0%～5.0% Al, 4.5%～6% Mo, 6%～7% V, 3%～4% Cr, 2%～3% Sn, 0.5%～1% Fe, surplus by weight percentage.
3. superhigh intensity titanium alloy, tool are characterised in that superhigh intensity titanium alloy is that Ti and unavoidable impurities are formed by 4.0% Al, 5% Mo, 6% V, 3% Cr, 2% Sn, 0.5% Fe, surplus by weight percentage.
4. the preparation method of a kind of superhigh intensity titanium alloy as claimed in claim 1, the preparation method who it is characterized in that superhigh intensity titanium alloy carries out according to the following steps:
One, take by weighing each component: by the weight percent of each element consist of 3.0%～5.0% Al, 4%～6% Mo, 5%～7% V, 2%～4% Cr, 1%～3% Sn, 0.5%～1% Fe, surplus is that Ti and unavoidable impurities take by weighing titanium sponge, rafifinal, pure chromium, pure tin, aluminium molybdenum alloy, aluminum-vanadium alloy and iron nail respectively as raw material; Two, preparation monolithic electrode: the feedstock production of step 1 is become the monolithic electrode; Three, preparation consumable electrode: monolithic electrode assembly welding in vacuum welding equipment of step 2 preparation is become consumable electrode; Four, preparation ingot casting: the consumable electrode of step 3 preparation is carried out twice melting be prepared into ingot casting in vacuum consumable electrode arc furnace; Five, preparation forging stock: ingot casting 150 ℃～200 ℃ coggings forgings more than alpha+beta/beta transformation point of step 4 preparation are prepared into forging stock; Six, pier pull out, finish-forging: with the forging stock of step 5 preparation alpha+beta/beta transformation point up and down 50 ℃～100 ℃ carry out two to three fire time repeatedly piers pull out, then alpha+beta/beta transformation point up and down 0 ℃～100 ℃ carry out finish-forging, namely obtain superhigh intensity titanium alloy.
5. the preparation method of a kind of superhigh intensity titanium alloy according to claim 4 is characterized in that in the step 1 that weight percent by each element consists of 4.0%～5.0% Al, 4.5%～6% Mo, 6%～7% V, 3%～4% Cr, 2%～3% Sn, 0.5%～1% Fe, surplus is that Ti and unavoidable impurities take by weighing titanium sponge, rafifinal, pure chromium, pure tin, aluminium molybdenum alloy, aluminum-vanadium alloy and iron nail respectively as raw material.
6. the preparation method of a kind of superhigh intensity titanium alloy according to claim 4 is characterized in that in the step 1 that weight percent by each element consists of 4.0% Al, 5% Mo, 6% V, 3% Cr, 2% Sn, 0.5% Fe, surplus is that Ti and unavoidable impurities take by weighing titanium sponge, rafifinal, pure chromium, pure tin, aluminium molybdenum alloy, aluminum-vanadium alloy and iron nail respectively as raw material.
7. the preparation method of a kind of superhigh intensity titanium alloy according to claim 4 is characterized in that ingot casting 160 ℃～200 ℃ coggings forgings more than alpha+beta/beta transformation point that in the step 5 step 4 prepared are prepared into forging stock.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104174791A (en) * | 2014-07-22 | 2014-12-03 | 中国科学院金属研究所 | Preparation method of titanium alloy spring made of wire with specially-shaped section |
| CN104561651A (en) * | 2013-10-11 | 2015-04-29 | 东港市东方高新金属材料有限公司 | Titanium alloy (Ti5563) rolled pipe and preparation method thereof |
| CN104862529A (en) * | 2015-06-06 | 2015-08-26 | 西北有色金属研究院 | Super-high strength and high-plasticity titanium alloy |
| CN105088012A (en) * | 2015-09-14 | 2015-11-25 | 沈阳泰恒通用技术有限公司 | Titanium alloy piston and connecting rod set applied to diesel locomotive and process method |
| CN106435264A (en) * | 2016-06-08 | 2017-02-22 | 中国船舶重工集团公司第七二五研究所 | Medium-strength high-toughness corrosion-resistant weldable alloy and preparation method thereof |
| CN108277385A (en) * | 2018-03-07 | 2018-07-13 | 北京德勤伟业航空投资管理有限公司 | A kind of titanium alloy plate and processing method |
| CN108950297A (en) * | 2017-05-24 | 2018-12-07 | 江苏天工科技股份有限公司 | A kind of high strength titanium alloy suitable for high-temperature work environment |
| CN110229976A (en) * | 2019-06-04 | 2019-09-13 | 北京科技大学 | A kind of yield strength is higher than the high-tenacity titanium alloy and preparation method of 900MPa |
| CN114657417A (en) * | 2022-05-07 | 2022-06-24 | 北京航空航天大学 | High-strength plastic titanium alloy suitable for cold deformation processing and preparation method thereof |
| CN115927909A (en) * | 2022-11-28 | 2023-04-07 | 哈尔滨工业大学 | Method for regulating and controlling as-cast high-strength and high-toughness titanium alloy by using beta stable element |
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| CN104561651A (en) * | 2013-10-11 | 2015-04-29 | 东港市东方高新金属材料有限公司 | Titanium alloy (Ti5563) rolled pipe and preparation method thereof |
| CN104561651B (en) * | 2013-10-11 | 2017-05-17 | 东港市东方高新金属材料有限公司 | Titanium alloy (Ti5563) rolled pipe and preparation method thereof |
| CN104174791A (en) * | 2014-07-22 | 2014-12-03 | 中国科学院金属研究所 | Preparation method of titanium alloy spring made of wire with specially-shaped section |
| CN104174791B (en) * | 2014-07-22 | 2016-03-30 | 中国科学院金属研究所 | The preparation method of profiled-cross-section silk material titanium alloy spring |
| CN104862529A (en) * | 2015-06-06 | 2015-08-26 | 西北有色金属研究院 | Super-high strength and high-plasticity titanium alloy |
| CN105088012A (en) * | 2015-09-14 | 2015-11-25 | 沈阳泰恒通用技术有限公司 | Titanium alloy piston and connecting rod set applied to diesel locomotive and process method |
| CN106435264A (en) * | 2016-06-08 | 2017-02-22 | 中国船舶重工集团公司第七二五研究所 | Medium-strength high-toughness corrosion-resistant weldable alloy and preparation method thereof |
| CN108950297A (en) * | 2017-05-24 | 2018-12-07 | 江苏天工科技股份有限公司 | A kind of high strength titanium alloy suitable for high-temperature work environment |
| CN108277385A (en) * | 2018-03-07 | 2018-07-13 | 北京德勤伟业航空投资管理有限公司 | A kind of titanium alloy plate and processing method |
| CN110229976A (en) * | 2019-06-04 | 2019-09-13 | 北京科技大学 | A kind of yield strength is higher than the high-tenacity titanium alloy and preparation method of 900MPa |
| CN114657417A (en) * | 2022-05-07 | 2022-06-24 | 北京航空航天大学 | High-strength plastic titanium alloy suitable for cold deformation processing and preparation method thereof |
| CN115927909A (en) * | 2022-11-28 | 2023-04-07 | 哈尔滨工业大学 | Method for regulating and controlling as-cast high-strength and high-toughness titanium alloy by using beta stable element |
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