CN103627928A - Low-temperature-resistant and high-strength two-phase titanium alloy - Google Patents
Low-temperature-resistant and high-strength two-phase titanium alloy Download PDFInfo
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Abstract
The invention provides a low-temperature-resistant and high-strength two-phase titanium alloy. The low-temperature-resistant and high-strength two-phase titanium alloy comprises the following components in percentage by mass: 1.5-3.5% of Al, 4.5-6.5% of Nb, 1.2-3% of Mo and the balance of titanium and unavoidable impurities. At a low temperature of 20K, the low-temperature-resistant and high-strength two-phase titanium alloy has mechanical properties as follows: Rm is greater than or equal to 1400MPa, Rp0.2 is greater than or equal to 1100MPa, and A is greater than or equal to 20%; compared with the conventional low-temperature-resistant titanium alloy, the low-temperature-resistant and high-strength two-phase titanium alloy has more excellent strength-plasticity matching, and can meet relevant requirements on low-temperature-resistant components of high-performance rocket, spacecrafts and spaceships.
Description
Technical field
The invention belongs to titanium alloy technical field, be specifically related to a kind of low-temperature high-strength diphasic titanium alloy.
Background technology
There is no a kind of space rocket is not use titanium and alloy thereof, as engine lifting bracket member, piping system, cryogenic liquid bin, liquid hydrogen delivery pump blade wheel and bracket etc., can say, titanium and alloy thereof receive space flight and rocketry equipment preparation personnel's concern all the time.In order to meet the requirement that in high-performance rocket, spacecraft and spaceship, low temperature component life is on active service safely, the titanium alloy of use not only should have the strong plasticity coupling of high low temperature, also should have good temperature-room type plasticity and be beneficial to processing.
Consider these requirements, can generally select the good α type of room temperature cold-forming property and nearly α type alloy at the Cryogenic Titanium Alloy of liquid hydrogen temperature (20K) long service.The countries such as Japan, the U.S. and USSR (Union of Soviet Socialist Republics) all stipulate the safe handling temperature of dissimilar Cryogenic Titanium Alloy, alpha titanium alloy TA7ELI, AT2, OT4, alpha and beta type titan alloy TC4ELI all can use safely under 20K, but TA7 and TC4 alloying constituent must be controlled as ultralow gap level, because the increase of the interstitial element content such as O, C, N can reduce titanium alloy low temperature fracture toughness and plasticity greatly, cause alloy low-temperature performance responsive to oxygen level.Existing U.S.A is that Cryogenic Titanium Alloy TA7 alloy increases owing to having added Sn element atarting material fragility, and at room temperature cold working hardening rate of TC4 alloy is high, and the cold-forming property of two kinds of alloys is poor, all cannot adopt as everyone knows conventional cold working mode to prepare tubing.Russia is that alpha titanium alloy AT2, OT4 are owing to not containing Al element, although the impelling strength that this series alloy has high intensity and satisfaction at low temperature matches, and these alloys are less to oxygen level susceptibility, but this is associated gold, the plasticity when 20K is lower, is only 11%～14%.
Therefore, need a kind of low-temperature high-strength diphasic titanium alloy of research and development badly, to meet the related request of low temperature parts in high-performance rocket, spacecraft and spaceship.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, and a kind of low-temperature high-strength diphasic titanium alloy is provided.The mechanical property of this titanium alloy under 20K cold condition meets: R
m>=1400MPa, Rp
0.2>=1100MPa, A>=20%, has more excellent strong plasticity coupling than traditional Cryogenic Titanium Alloy, meets the related request of low temperature parts in high-performance rocket, spacecraft and spaceship.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of low-temperature high-strength diphasic titanium alloy, is characterized in that, one-tenth by following mass percent is grouped into: Al1.5～3.5%, Nb4.5～6.5%, Mo1.2～3%, surplus is titanium and inevitable impurity; Described low-temperature high-strength diphasic titanium alloy refers to that this titanium alloy is that mechanical property under 20K condition meets: R in temperature
m>=1400MPa, Rp
0.2>=1100MPa, A>=20%.
Above-mentioned a kind of low-temperature high-strength diphasic titanium alloy, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al1.5%, and Nb5%, Mo1.2%, surplus is titanium and inevitable impurity.
Above-mentioned a kind of low-temperature high-strength diphasic titanium alloy, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al1.5%, and Nb4.5%, Mo3%, surplus is titanium and inevitable impurity.
Above-mentioned a kind of low-temperature high-strength diphasic titanium alloy, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al2.5%, and Nb5.5%, Mo1.7%, surplus is titanium and inevitable impurity.
Above-mentioned a kind of low-temperature high-strength diphasic titanium alloy, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al3.5%, and Nb6.5%, Mo2.5%, surplus is titanium and inevitable impurity.
Above-mentioned a kind of low-temperature high-strength diphasic titanium alloy, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al1.5%, and Nb5%, Mo2.5%, surplus is titanium and inevitable impurity.
Above-mentioned a kind of low-temperature high-strength diphasic titanium alloy, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al3.5%, and Nb5%, Mo2.1%, surplus is titanium and inevitable impurity.
The preparation method of low-temperature high-strength titanium alloy of the present invention is the conventional preparation method of titanium alloy: select first as required suitable raw material, press design mix mixing electrode pressing, with conventional vacuum consumable electrode arc furnace, through secondary or three meltings, obtain alloy cast ingot again, then alloy cast ingot stripped off the skin and cut after rising head and tail end, on the open die forging equipment such as hydrostatic forging machine, forging hammer, carry out time upsetting pull forging repeatedly of cogging forging and many fire, finally on the rolling equipments such as hot rolls, cold-rolling mill, carry out multi-pass rolling and obtain bar or sheet material.
The present invention compared with prior art has the following advantages and technique effect:
1, in titanium alloy of the present invention, the total content of composition aluminium, niobium, molybdenum is controlled in 13%, 1.5～3.5% aluminium content and 1.2～3% molybdenum content can effectively guarantee that titanium alloy has good room temperature strength, and aluminium, niobium, three kinds of alloying elements of molybdenum is reasonably combined, can make titanium alloy there is more than 19% good plasticity and good cold and hot working performance under 298K room temperature condition, be suitable for adopting conventional cold working mode to manufacture bar, sheet material and tubing.
2, the ratio of Nb in Ti Alloys of the present invention is 4.5～6.5%, and the ratio of molybdenum is 1.2～3%, and this ratio is that contriver optimizes and draws after lot of experiments.4.5～6.5% content of niobium and 1.2～3% molybdenum content can make the low-temperature performance of titanium alloy have more excellent strong plasticity coupling than existing Cryogenic Titanium Alloy, and the plasticity under its 20K cold condition is higher than 20%.
3, in titanium alloy of the present invention, 4.5%～6.5% content of niobium can make titanium alloy diminish to oxygen level susceptibility, under elevated oxygen level, still can normally use.
4, titanium alloy of the present invention is that mechanical property under 20K condition meets: R in temperature
m>=1400MPa, Rp
0.2>=1100MPa, A>=20%, has more excellent strong plasticity coupling than traditional Cryogenic Titanium Alloy, meets the related request of low temperature parts in high-performance rocket, spacecraft and spaceship.
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment
Low-temperature high-strength diphasic titanium alloy of the present invention is grouped into by the one-tenth of following mass percent: Al1.5～3.5%, and Nb4.5～6.5%, Mo1.2～3%, surplus is titanium and inevitable impurity.The related raw material of this titanium alloy comprises aluminium molybdenum alloys, titanium niobium alloy, aluminium shot and titanium sponge.In concrete preparation process, first as required select suitable raw material, press design mix mixing electrode pressing, in vacuum consumable electrode arc furnace, through secondary or three conventional meltings, obtain alloy cast ingot again, then alloy cast ingot stripped off the skin and cut after rising head and tail end, on the open die forging equipment such as hydrostatic forging machine, forging hammer, carry out time upsetting pull forging repeatedly of cogging forging and many fire, finally on the rolling equipments such as hot rolls, cold-rolling mill, carry out multi-pass rolling and obtain bar or sheet material.The Heating temperature that described cogging is forged is 1050 ℃～1150 ℃, and to pull out the Heating temperature of forging be 850 ℃～980 ℃ to pier repeatedly, and the Heating temperature of hot rolling is 750～900 ℃, the pass deformation 30%～70% of hot rolling, cold rolling pass deformation 10%～35%.The mechanical property of titanium alloy of the present invention under 20K cold condition meets: R
m>=1400MPa, Rp
0.2>=1100MPa, A>=20%, has more excellent strong plasticity coupling than traditional Cryogenic Titanium Alloy, meets the related request of low temperature parts in high-performance rocket, spacecraft and spaceship.
Embodiment 1
The nominal composition of the present embodiment titanium alloy is Ti-1.5Al-5Nb-1.2Mo, is Al1.5% by weight percentage, Nb5%, and Mo1.2%, surplus is titanium and inevitable impurity.
The preparation method of the present embodiment titanium alloy is: by nominal composition Ti-1.5Al-5Nb-1.2Mo batching, starting material adopt Al-60Mo master alloy, Ti-50Nb master alloy, aluminium shot and zero level titanium sponge.Starting material mix rear electrode pressing, with vacuum consumable electrode arc furnace melting, obtain alloy cast ingot three times.Alloy cast ingot is through stripping off the skin and excising after rising head and tail end, on flat-die forging equipment, in 1100 ℃, carry out cogging forging, then in temperature, it is 900 ℃, pass deformation is under 60% condition, to carry out upsetting pull repeatedly to forge, in temperature, it is finally 860 ℃, pass deformation is to carry out multi-pass hot rolling under 50% condition, finally obtains the sheet material that thickness is 2mm.
The 298K room-temperature property of the present embodiment titanium alloy plate after 900 ℃/1h+800 ℃/3h thermal treatment is: R
m=713MPa, Rp
0.2=592MPa, A=19%; 20K low-temperature performance is: R
m=1457MPa, R
p0.2=1257MPa, A=24%
Embodiment 2
The nominal composition of the present embodiment titanium alloy is Ti-1.5Al-4.5Nb-3Mo, is Al1.5% by weight percentage, Nb4.5%, and Mo3%, surplus is titanium and inevitable impurity.
The preparation method of the present embodiment titanium alloy is: by nominal composition Ti-1.5Al-4.5Nb-3Mo batching, starting material adopt Al-55Mo master alloy, Ti-50Nb master alloy, aluminium shot and zero level titanium sponge.Starting material mix rear electrode pressing, with vacuum consumable electrode arc furnace melting, obtain alloy cast ingot three times.Alloy cast ingot is through stripping off the skin and excising after rising head and tail end, on flat-die forging equipment, through 1080 ℃ of coggings, forge, then in temperature, be 9298K, pass deformation is under 55% condition, to carry out upsetting pull repeatedly to forge, in temperature, it is finally 840 ℃, pass deformation is to carry out multi-pass hot rolling under 60% condition, finally obtains the sheet material that thickness is 2mm.
The 298K room-temperature property of the present embodiment titanium alloy plate after 800 ℃/1h+700 ℃/3h thermal treatment is: R
m=603MPa, Rp
0.2=496MPa, A=21%; 20K cryogenic stretching performance is: R
m=1472MPa, R
p0.2=1213MPa, A=26%.
Embodiment 3
The nominal composition of the present embodiment titanium alloy is Ti-2.5Al-5.5Nb-1.7Mo, is Al2.5% by weight percentage, Nb5.5%, and Mo1.7%, surplus is titanium and inevitable impurity.
The preparation method of the present embodiment titanium alloy is: by nominal composition Ti-2.5Al-5.5Nb-1.7Mo batching, starting material adopt Al-60Mo master alloy, Ti-46Nb master alloy, aluminium shot and zero level titanium sponge.Starting material mix rear electrode pressing, with vacuum consumable electrode arc furnace melting, obtain alloy cast ingot three times.Alloy cast ingot is through stripping off the skin and excising after rising head and tail end, on flat-die forging equipment, through 1100 ℃ of coggings, forge, then in temperature, it is 880 ℃, pass deformation is under 50% condition, to carry out upsetting pull repeatedly to forge, in temperature, it is finally 860 ℃, pass deformation is to carry out multi-pass hot rolling under 60% condition, finally obtains the sheet material that thickness is 2mm.
The 298K room-temperature property of the present embodiment titanium alloy plate after 850 ℃/1h+750 ℃/3h thermal treatment is: R
m=670MPa, Rp
0.2=560MPa, A=24%; 20K cryogenic stretching performance is: R
m=1491MPa, R
p0.2=1286MPa, A=21%.
Embodiment 4
The nominal composition of the present embodiment titanium alloy is Ti-3.5Al-6.5Nb-2.5Mo, is Al3.5% by weight percentage, Nb6.5%, and Mo2.5%, surplus is titanium and inevitable impurity.
The preparation method of the present embodiment titanium alloy is: by nominal composition Ti-3.5Al-6.5Nb-2.5Mo batching, starting material adopt Al-60Mo master alloy, Ti-46Nb master alloy, aluminium shot and zero level titanium sponge.Starting material mix rear electrode pressing, with vacuum consumable electrode arc furnace melting, obtain alloy cast ingot three times.Alloy cast ingot is through stripping off the skin and excising after rising head and tail end, on flat-die forging equipment, through 1080 ℃ of coggings, forge, then in temperature, it is 900 ℃, pass deformation is under 50% condition, to carry out upsetting pull repeatedly to forge, in temperature, it is finally 850 ℃, pass deformation is to carry out multi-pass hot rolling under 55% condition, finally obtains the bar that diameter of section is 2mm.
The 298K room-temperature property of the present embodiment titanium alloy rod bar after 900 ℃/1h+810 ℃/3h thermal treatment is: R
m=720MPa, Rp
0.2=610MPa, A=19%; 20K cryogenic stretching performance is: R
m=1510MPa, R
p0.2=1372MPa, A=20%.
Embodiment 5
The nominal composition of the present embodiment titanium alloy is Ti-1.5Al-5Nb-2.5Mo, is Al1.5% by weight percentage, Nb5%, and Mo2.5%, surplus is titanium and inevitable impurity.Raw material choose is: Al-60Mo alloy, Ti-46Nb alloy, aluminium shot, 0 grade of titanium sponge.
The preparation method of the present embodiment titanium alloy is: by nominal composition Ti-1.5Al-5Nb-2.5Mo batching, starting material adopt Al-60Mo master alloy, Ti-46Nb master alloy, aluminium shot and zero level titanium sponge.Starting material mix rear electrode pressing, with vacuum consumable electrode arc furnace melting, obtain alloy cast ingot three times.Alloy cast ingot is through stripping off the skin and excising after rising head and tail end, on flat-die forging equipment, through 1080～1100 ℃ of coggings, forge, then in temperature, it is 900 ℃, pass deformation is under 50% condition, to carry out upsetting pull repeatedly to forge, in temperature, it is 840 ℃ afterwards, pass deformation is to carry out multi-pass hot rolling under 50% condition, finally under the condition of pass deformation 35%, carries out multi-pass cold rolling, finally obtains the bar that diameter of section is 2mm.
The 298K room-temperature property of the present embodiment titanium alloy rod bar after 850 ℃/1h+780 ℃/3h thermal treatment is: R
m=710MPa, Rp
0.2=590MPa, A=20%; 20K cryogenic stretching performance is: R
m=1475MPa, R
p0.2=1186MPa, A=26%.
Embodiment 6
The nominal composition of the present embodiment titanium alloy is Ti-3.5Al-5Nb-2.1Mo, is Al3.5% by weight percentage, Nb5%, and Mo2.1%, surplus is titanium and inevitable impurity.Raw material choose is: Al-60Mo alloy, Ti-46Nb alloy, aluminium shot, 0 grade of titanium sponge.
The preparation method of the present embodiment titanium alloy is: by nominal composition Ti-3.5Al-5Nb-2.1Mo batching, starting material adopt Al-60Mo master alloy, Ti-46Nb master alloy, aluminium shot and zero level titanium sponge.Starting material mix rear electrode pressing, with vacuum consumable electrode arc furnace melting, obtain alloy cast ingot three times.Alloy cast ingot is through stripping off the skin and excising after rising head and tail end, on flat-die forging equipment, through 1080～1100 ℃ of coggings, forge, then in temperature, it is 880 ℃, pass deformation is under 55% condition, to carry out upsetting pull repeatedly to forge, in temperature, it is 860 ℃ afterwards, pass deformation is to carry out multi-pass hot rolling under 60% condition, finally under the condition of pass deformation 10%, carries out multi-pass cold rolling, finally obtains the bar that diameter of section is 2mm.
The 298K room-temperature property of the present embodiment titanium alloy rod bar after 8298K/1h+750 ℃/3h thermal treatment is: R
m=610MPa, Rp
0.2=480MPa, A=22%; 20K cryogenic stretching performance is: R
m=1410MPa, Rp
0.2=1210MPa, A=23%.
The above, be only preferred embodiment of the present invention, not the present invention imposed any restrictions.Every any simple modification of above embodiment being done according to invention technical spirit, change and equivalence change, and all still belong in the protection domain of technical solution of the present invention.
Claims (7)
1. a low-temperature high-strength diphasic titanium alloy, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al1.5%～3.5%, and Nb4.5%～6.5%, Mo1.2%～3%, surplus is titanium and inevitable impurity; Described low-temperature high-strength diphasic titanium alloy refers to that this titanium alloy is that mechanical property under 20K condition meets: Rm>=1400MPa, Rp in temperature
0.2>=1100MPa, A>=20%.
2. a kind of low-temperature high-strength diphasic titanium alloy according to claim 1, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al1.5%, and Nb5%, Mo1.2%, surplus is titanium and inevitable impurity.
3. a kind of low-temperature high-strength diphasic titanium alloy according to claim 1, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al1.5%, and Nb4.5%, Mo3%, surplus is titanium and inevitable impurity.
4. a kind of low-temperature high-strength diphasic titanium alloy according to claim 1, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al2.5%, and Nb5.5%, Mo1.7%, surplus is titanium and inevitable impurity.
5. a kind of low-temperature high-strength diphasic titanium alloy according to claim 1, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al3.5%, and Nb6.5%, Mo2.5%, surplus is titanium and inevitable impurity.
6. a kind of low-temperature high-strength diphasic titanium alloy according to claim 1, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al1.5%, and Nb5%, Mo2.5%, surplus is titanium and inevitable impurity.
7. a kind of low-temperature high-strength diphasic titanium alloy according to claim 1, is characterized in that, by the one-tenth of following mass percent, is grouped into: Al3.5%, and Nb5%, Mo2.1%, surplus is titanium and inevitable impurity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114150180A (en) * | 2021-11-01 | 2022-03-08 | 新乡学院 | Ocean engineering titanium alloy material for electron beam fuse 3D printing and preparation method thereof |
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| JPH11199955A (en) * | 1998-01-20 | 1999-07-27 | Mitsubishi Materials Corp | Titanium alloy for casting, excellent in impact resistance |
| WO2009151031A1 (en) * | 2008-06-11 | 2009-12-17 | 株式会社神戸製鋼所 | α－β TYPE TITANIUM ALLOY |
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| CN101886188A (en) * | 2010-04-08 | 2010-11-17 | 厦门大学 | Beta titanium alloy and preparation method thereof |
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2013
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| JPS62103331A (en) * | 1985-10-28 | 1987-05-13 | Sumitomo Metal Ind Ltd | High-strength titanium alloy excellent in cold workability |
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| WO2009151031A1 (en) * | 2008-06-11 | 2009-12-17 | 株式会社神戸製鋼所 | α－β TYPE TITANIUM ALLOY |
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| CN114150180A (en) * | 2021-11-01 | 2022-03-08 | 新乡学院 | Ocean engineering titanium alloy material for electron beam fuse 3D printing and preparation method thereof |
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