CN106636746A - High-strength and high-elongation high-temperature titanium alloy and preparing technology thereof - Google Patents
High-strength and high-elongation high-temperature titanium alloy and preparing technology thereof Download PDFInfo
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- CN106636746A CN106636746A CN201611237245.1A CN201611237245A CN106636746A CN 106636746 A CN106636746 A CN 106636746A CN 201611237245 A CN201611237245 A CN 201611237245A CN 106636746 A CN106636746 A CN 106636746A
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- C—CHEMISTRY; METALLURGY
- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention provides a high-strength and high-elongation high-temperature titanium alloy and a preparing technology thereof and belongs to the technical field of titanium alloy. The high-strength and high-elongation high-temperature titanium alloy is prepared from 5-7% of Al, 3-5% of Sn, 4-6% of Zr, 0.3-1.0% of Mo, 0.5-0.8% of Nb, 1-3% of Ta, 0.4-0.5% of Si, 0.01-0.1% of C, 0.1-0.2% of Er and the balance of Ti. The preparing technology comprises the following steps: weighing the raw materials, and smelting by adopting a vacuum induction melting furnace with a water-cooled copper crucible; forging, to be specific, carrying out isothermal one-step axial forging on an alloy ingot; after keeping the ingot in a resistance furnace at 1050DEG C, taking out, transferring onto forging equipment, carrying out hot forging, and ensuring that the deformation quantity is 76.7%; and after forging, air-cooling to a room temperature. The prepared titanium alloy is high in strength and high in elongation.
Description
Technical field
The present invention relates to a kind of design of alloy and its preparation technology, belong to titanium alloy technical field.
Background technology
Titanium or titanium alloy density is little, specific strength is high, corrosion-resistant, high and low temperature resistance is good, is another heavy after iron and steel, aluminium
The structural material wanted, with the title such as " the 3rd metal ", " space metal ".Although the industrialized production of titanium only has over half a century
History, but at present titanium and its alloy in Aeronautics and Astronautics, navigation, Vehicle Engineering, petrochemical industry, metallurgy, machinery, medical treatment, energy
The various fields such as source obtain extensively application, especially aerospace field.Titanium alloy is mainly used in aircraft engine wheel disc, low
The positions such as pressure turbo blade, rotor, drum barrel, product type is mainly forging and sheet material, in view of requirement of the engine to material is severe
Carve, it is desirable to which it has the matched well of good room-temperature property, elevated temperature strength and fracture toughness etc., and this is accomplished by us and develops one
Plant the titanium alloy of stiffness high-elongation.
The hot schedule of reinforcement of high-temperature titanium alloy mainly includes solution strengthening and precipitation hardening, presently used nearly α types
Ti-Al-Sn-Zr-Mo-Si systems high-temperature titanium alloy, mainly based on the solution strengthening of α phases, while being suitably beneficial to disperse educt
The phases of α 2 and silicide phase precipitation enhancement, and beta transus temperature (T β) is improved by alloying, so as to improve heat resistance
And oxidation resistance, the solution strengthening of α phases is performed to ultimate attainment.For high-temperature titanium alloy, T β are a critically important parameters, are improved
T β contribute to improving the heat resistance of alloy, but can not infinitely improve T β, when being designed to alloying component, in addition it is also necessary to comprehensive to examine
Consider the equivalent thickness of aluminium [Al] eq and molybdenum equivalent [Mo] eq of alloy, by [Al] eq or [Mo] eq values as Titanium Alloy Design important standard
Then.
Can see from external high-temperature titanium alloy development course, with the rising using temperature, the element added in alloy
It is in alloy elements such as diversified trend, the such as Ti-6Al-4V of early 1950s, Ti-5Al-2.5Sn, Ti-8-1-1
2-3 kinds；First for succeeding in developing for 1984,600 DEG C of titanium alloy IMI834 alloy elements increase to 7 kinds.If it can be seen that lacked
Necessary theoretical direction, using the method for traditional cooking trial and error, independent development high-temperature titanium alloy can have blindness, lead time
The defects such as length, risk height.For this purpose, HU etc. has carried out alloying the first principle calculation of titanium alloy Effect on Mechanical Properties is studied,
Using the super primitive unit cell total energy methods of LMTO-ASA, by calculating alloy atom-room interaction energy, the system research periodic table of elements
In the 3rd, 4, impact of the most elements to nearly alpha titanium alloy croop property in 5 cycles.The calculated results are tied with experimental study
Fruit is identical, and nowadays has proven to Fe, Ni to high-temperature titanium alloy persistently and croop property has very detrimental effect.First Principle
Calculate and the bridge between high-temperature titanium alloy mechanical property, select for high-temperature titanium alloy alloy element and its effect prediction is provided
Foundation.The present invention combines first principle calculation and designs alloying component.
Forging is one of important channel of titanium alloy component production, and by forging suitable forging shape not only can be obtained
Shape, it is often more important that heavy alloyed mechanical performance can be put forward.Titan alloy casting ingot cogging is generally from more than β phase transition temperatures 100～150
DEG C β monophase fields start, then gradually reduce heating-up temperature, short base or bar are processed into using open die forging or radial forging.Change
Forging alternately, adopts upsetting pull repeatedly to crush thick as cast condition group typically in alpha+beta two-phase section or in beta transus temperature annex
Knit, obtain equiaxed structure, subsequently according to actual needs semifinished or finished goods can be produced using the mode such as open die forging or die forging, this
Bright employing alpha+beta forging technology.
The content of the invention
The invention solves the problems that the problem of the titanium alloy tensile strength of existing method preparation and elongation percentage difference, and provide a kind of high
Intensity high-elongation high-temperature titanium alloy into and preparation technology.
To realize goal of the invention as above, the present invention adopts technical scheme as described below.
A kind of high-strength high-elongation ratio high-temperature titanium alloy of the present invention is by mass percentage by Al：5%-7%, Sn：3%-
5%th, Zr：4%-6%, Mo：0.3%-1.0%, Nb：0.5%-0.8%, Ta：1%-3%, Si：0.4%-0.5%, C：
0.01%-0.1%, Er：The Ti of 0.1%-0.2% and surplus makes.
The preparation technology of above-mentioned high-strength high-elongation ratio high-temperature titanium alloy is to carry out according to the following steps：
(1) alloy raw material is weighed：Consist of by each element percentage by weight Al, 3%-5% of 5%-7% Sn,
The Si of Ta, 0.4%-0.5% of Nb, 1%-3% of Mo, 0.5%-0.8% of Zr, 0.3%-1.0% of 4%-6%,
The Er of C, 0.1%-0.2% of 0.01%-0.1% and balance of Ti weigh respectively titanium sponge, high-purity aluminium ingot, sponge zirconium, high-purity
Close in the middle of silicon, high-purity tantalum piece, high purity graphite powder, Ti-Sn intermediate alloys, Al-Nb intermediate alloys, Al-Mo intermediate alloys, Al-Er
Gold is raw material；
(2) melting：The raw material that step (1) is weighed are carried out into melting using water jacketed copper crucible vacuum induction melting furnace, is melted
Downlink power is 150～170KW, and melt suspension time is 50s-60s.To improve the accuracy and uniformity of composition, ingot casting needs anti-
Remelt is refined three times, obtains titan alloy casting ingot；
(3) forge：The alloy cast ingot that step (2) is obtained is carried out into isothermal single step axially to forge, by ingot casting in resistance furnace
It is incubated to take out to be transported on forging equipment after Tmin in 1050 DEG C and carries out warm and hot forging, deflection is 76.7%, is air cooled to after forging
Room temperature；Ingot casting titanium alloy is cut into rising head before forging, ingot casting surrounding applies last layer antioxidizing paint, and spindle surrounding wraps up one layer
Heat-preservation cotton, forging arranges suitable heating-up temperature and temperature retention time, prevent the heat time it is too short so that ingot casting heat it is impermeable,
Or the heat time is oversize situations such as cause β crystal grain to grow up.It is preferred that forging time is by the corresponding time note of 1min/mm ingot casting radiuses
For t, (i.e. per mm radiuses correspondence 1min, total time is t) T=(1.3-1.5) t.
Using technical scheme as above, the present invention has superiority as described below：
A kind of composition design and its preparation technology of high-strength high-elongation ratio high-temperature titanium alloy of the present invention, has：
(1) present invention adds a certain amount of weak β according to the design philosophy of traditional nearly α types Ti-Al-Sn-Zr-Mo-Si system high-temperature titanium alloy
Stable element Ta and rare earth element er, Ta and Ti have close atomic radius and elecrtonegativity, and it has larger in α-Ti
Solid solubility, can play good solution strengthening effect, while making alloy keep higher plasticity, in addition Ta can also improve titanium conjunction
The high-temperature oxidation resistance of gold.Er is rare earth element, and when adding rare earth element in titanium alloy, rare earth element captures titanium alloy substrate
In gap oxygen element, improve the toughness of alloy.In addition rare earth element can form second-phase dispersion particle, can crystal grain thinning,
Increase dislocation density, be conducive to putting forward heavy alloyed tensile strength and creep resistance；(2) the High-Temperature Strengthening principle machine of material of the present invention
Reason is mainly by controlling Al equivalents, the method for Mo equivalents combines first principle calculation and designs alloying component.
Description of the drawings
Fig. 1 titanium alloys room temperature tensile properties contrast block diagram；
Fig. 2 titanium alloy high-temperatures tensile property contrasts block diagram；
Specific embodiment
The present invention can be explained in more detail by the following examples, technical solution of the present invention is not limited to set forth below
The specific embodiment of act.
Embodiment
A kind of high-strength high-elongation ratio high-temperature titanium alloy of the present invention, its composition peace mass percent includes：
Al：5%-7%, Sn：3%-5%, Zr：4%-6%, Mo：0.3%-1.0%, Nb：0.5%-0.8%, Ta：
1%-3%, Si：0.4%-0.5%, C：0.01%-0.1%, Er：The Ti of 0.1%-0.2% and surplus.
A kind of preparation technology of high-strength high-elongation ratio high-temperature titanium alloy, comprises the following steps that：
(1) alloy raw material is weighed：Consist of by each element percentage by weight Al, 3%-5% of 5%-7% Sn,
The Si of Ta, 0.4%-0.5% of Nb, 1%-3% of Mo, 0.5%-0.8% of Zr, 0.3%-1.0% of 4%-6%,
The Er of C, 0.1%-0.2% of 0.01%-0.1% and balance of Ti weigh respectively titanium sponge, high-purity aluminium ingot, sponge zirconium, high-purity
Close in the middle of silicon, high-purity tantalum piece, high purity graphite powder, Ti-Sn intermediate alloys, Al-Nb intermediate alloys, Al-Mo intermediate alloys, Al-Er
Gold is raw material；
(2) melting：The raw material that step (1) is weighed are carried out into melting using water jacketed copper crucible vacuum induction melting furnace, is melted
Downlink power is 150～170KW, and melt suspension time is 50s-60s.To improve the accuracy and uniformity of composition, ingot casting needs anti-
Remelt is refined three times, obtains titan alloy casting ingot；
(3) forge：The alloy cast ingot that step (2) is obtained is carried out into isothermal single step axially to forge, by ingot casting in resistance furnace
It is incubated to take out to be transported on forging equipment after 40min in 1050 DEG C and is forged, deflection is 76.7%, and room is air cooled to after forging
Temperature.Ingot casting titanium alloy is cut into rising head before forging, the spindle size after cutting is about diameter 60mm, high 150mm；Ingot casting surrounding is applied
Last layer antioxidizing paint Ti-1200, to prevent spindle over oxidation in heating process；Spindle surrounding wraps up one layer of heat preservation
Cotton, to prevent from transporting the excessive drop temperature with spindle in forging process after heating；Suitable heating-up temperature and temperature retention time are set, are prevented
Only occur the heat time it is too short so that ingot casting heat it is impermeable, or the heat time it is oversize situations such as cause β crystal grain to grow up.
The specific embodiment of the present invention is as follows：
The preparation technology of example 1 below # -2# titanium alloy materials is：Raw material adopt titanium sponge, rafifinal, sponge
Zirconium, HIGH-PURITY SILICON, high-purity tantalum piece, high purity graphite powder, Ti-Sn intermediate alloys, Al-Nb intermediate alloys, Al-Mo intermediate alloys, Al-Er
Intermediate alloy is pressed into electrode Jing after dispensing, batch mixing with press, by electrode in water jacketed copper crucible vacuum induction melting furnace melting 3
Time, make alloy cast ingot；The alloy cast ingot for obtaining is carried out into nearly isothermal single step axially to forge, by ingot casting in resistance furnace in 1050
Take out after DEG C insulation 40min and be transported on forging equipment and forged, deflection is 76.7%, and room temperature is air cooled to after forging.
The alloying component (wt%) of embodiment 1# -2# titanium alloy materials, see the table below shown.
The alloying component (wt%) of embodiment 1# of table 1-2# titanium alloy materials
The room temperature tensile properties of embodiment 1# -2# titanium alloy materials, see the table below shown.
The room temperature tensile properties of embodiment 1# of table 2-2# titanium alloy materials
650 DEG C of high temperature tensile properties of embodiment 1# -2# titanium alloy materials, see the table below shown.
650 DEG C of high temperature tensile properties of embodiment 1# of table 2-2# titanium alloy materials
From data above it will be seen that alloy of the present invention has good room temperature and 650 DEG C of elevated temperature strengths and extension
Rate.It can be seen that present invention effect is significant on titanium alloy intensity and elongation percentage is improved, especially significantly improves to high temperature elongation percentage.
Claims (4)
1. a kind of high-strength high-elongation ratio high-temperature titanium alloy, it is characterised in that by mass percentage by Al：5%-7%, Sn：
3%-5%, Zr：4%-6%, Mo：0.3%-1.0%, Nb：0.5%-0.8%, Ta：1%-3%, Si：0.4%-0.5%, C：
0.01%-0.1%, Er：The Ti of 0.1%-0.2% and surplus makes.
2. a kind of high-strength high-elongation ratio high-temperature titanium alloy obtains preparation method, it is characterised in that comprise the following steps：
(1) alloy raw material is weighed：Sn, 4%- of Al, 3%-5% of 5%-7% are consisted of by each element percentage by weight
Si, 0.01%- of Ta, 0.4%-0.5% of Nb, 1%-3% of Mo, 0.5%-0.8% of 6% Zr, 0.3%-1.0%
The Er of 0.1% C, 0.1%-0.2% and balance of Ti weigh respectively titanium sponge, high-purity aluminium ingot, sponge zirconium, HIGH-PURITY SILICON, high-purity
Tantalum piece, high purity graphite powder, Ti-Sn intermediate alloys, Al-Nb intermediate alloys, Al-Mo intermediate alloys, Al-Er intermediate alloys are original
Material；
(2) melting：The raw material that step (1) is weighed carry out melting, melting work(using water jacketed copper crucible vacuum induction melting furnace
Rate is 150～170KW, and melt suspension time is 50s-60s；Obtain titan alloy casting ingot；
(3) forge：The alloy cast ingot that step (2) is obtained is carried out into isothermal single step axially to forge, by ingot casting in resistance furnace in
Take out to be transported on forging equipment after 1050 DEG C of insulation Tmin and carry out warm and hot forging, deflection is 76.7%, and room is air cooled to after forging
Temperature；Forging arranges suitable heating-up temperature and temperature retention time, and by the 1min/mm ingot casting radiuses corresponding time t, T=(1.3- are designated as
1.5)t。
3. according to the method for claim 2, it is characterised in that step (2) is to improve the accuracy and uniformity of composition, and ingot casting is needed
Melt back three times, obtains titan alloy casting ingot.
4. according to the method for claim 2, it is characterised in that ingot casting titanium alloy is cut into rising head, ingot casting before step (3) forging
Surrounding applies last layer antioxidizing paint, spindle surrounding parcel one layer of heat preservation cotton.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109536777A (en) * | 2019-01-04 | 2019-03-29 | 青海聚能钛业股份有限公司 | A kind of high-temperature titanium alloy and preparation method thereof |
| CN109536776A (en) * | 2019-01-04 | 2019-03-29 | 青海聚能钛业股份有限公司 | A kind of heat-resistant titanium alloy and preparation method thereof |
| CN110983102A (en) * | 2019-12-02 | 2020-04-10 | 中国石油天然气集团有限公司 | Titanium alloy oil pipe and manufacturing method thereof |
| US10851439B2 (en) * | 2017-10-19 | 2020-12-01 | The Boeing Company | Titanium-based alloy and method for manufacturing a titanium-based alloy component by an additive manufacturing process |
| CN113290180A (en) * | 2021-05-27 | 2021-08-24 | 西北有色金属研究院 | Method for improving cogging forging cracking of heat-resistant titanium alloy |
| CN115821111A (en) * | 2022-10-19 | 2023-03-21 | 中国航发北京航空材料研究院 | Short-time high-temperature resistant titanium alloy and forging method thereof |
| CN118389903A (en) * | 2024-06-28 | 2024-07-26 | 新乡学院 | Medium-strength easy-forming high-temperature corrosion-resistant weldable titanium alloy for crane exhaust system and preparation method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10851439B2 (en) * | 2017-10-19 | 2020-12-01 | The Boeing Company | Titanium-based alloy and method for manufacturing a titanium-based alloy component by an additive manufacturing process |
| CN109536777A (en) * | 2019-01-04 | 2019-03-29 | 青海聚能钛业股份有限公司 | A kind of high-temperature titanium alloy and preparation method thereof |
| CN109536776A (en) * | 2019-01-04 | 2019-03-29 | 青海聚能钛业股份有限公司 | A kind of heat-resistant titanium alloy and preparation method thereof |
| CN110983102A (en) * | 2019-12-02 | 2020-04-10 | 中国石油天然气集团有限公司 | Titanium alloy oil pipe and manufacturing method thereof |
| CN113290180A (en) * | 2021-05-27 | 2021-08-24 | 西北有色金属研究院 | Method for improving cogging forging cracking of heat-resistant titanium alloy |
| CN113290180B (en) * | 2021-05-27 | 2022-07-08 | 西北有色金属研究院 | Method for improving cogging forging cracking of heat-resistant titanium alloy |
| CN115821111A (en) * | 2022-10-19 | 2023-03-21 | 中国航发北京航空材料研究院 | Short-time high-temperature resistant titanium alloy and forging method thereof |
| CN115821111B (en) * | 2022-10-19 | 2024-05-24 | 中国航发北京航空材料研究院 | Short-time high-temperature-resistant titanium alloy and forging method thereof |
| CN118389903A (en) * | 2024-06-28 | 2024-07-26 | 新乡学院 | Medium-strength easy-forming high-temperature corrosion-resistant weldable titanium alloy for crane exhaust system and preparation method |
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