CN106148739A - A kind of preparation method containing niobium Ti3Al alloy cast ingot - Google Patents
A kind of preparation method containing niobium Ti3Al alloy cast ingot Download PDFInfo
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- CN106148739A CN106148739A CN201610497822.4A CN201610497822A CN106148739A CN 106148739 A CN106148739 A CN 106148739A CN 201610497822 A CN201610497822 A CN 201610497822A CN 106148739 A CN106148739 A CN 106148739A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
Abstract
A kind of preparation method containing niobium Ti3Al alloy cast ingot, first prepare pure titanium ingot casting, purer titanium ingot casting is processed into bright titanium rod, then the bright titanium rod of acquisition is welded into consutrode with light niobium aluminium bar excellent, bright, through 3 vacuum consumable arc-meltings, it is thus achieved that containing niobium Ti3Al alloy cast ingot.The present invention uses the mode of bar welding to prepare consutrode, eliminates and prepares intermediate alloy, and the step of electrode pressing block, simplifies technique.Simultaneously, owing to using the mode of titanium rod, aluminium bar and niobium rod welding to prepare consutrode, the each constituent content that can ensure in fusion process on same melting cross section is consistent, owing to titanium rod, aluminium bar, niobium rod are closely knit material, it is to avoid metallurgical imperfections such as the uneven chemical components that produces because of local melting speed difference or being mingled with of falling that block produces.The composition of alloy cast ingot prepared by the present invention is uniform, overcomes in prior art that niobium element segregation is serious, alloying component is inaccurate and the problem of lack of homogeneity.
Description
Technical field
The invention belongs to titanium alloy preparation field, relate to a kind of preparation method containing niobium Ti3Al alloy cast ingot.
Background technology
Ti3Al is the one of Ti-Al base intermetallic compound, has orderly close-packed hexagonal structure, and its specific strength is high, but its
Elevated temperature strength and temperature-room type plasticity are relatively low, limit its development and application, can improve its high-temperature oxidation resistant by adding beta stable element Nb
Property and temperature-room type plasticity.The Ti3Al base alloy containing niobium has many excellent performances, compared with common alloy of titanium, has more preferable height
Warm nature energy, oxidation resistance, creep-resistant property, higher use temperature；Compared with nickel-base alloy, density is little, the most Ni-based conjunction
Alleviating of the half of gold, beneficially weight of equipment；Compared with ceramic material, at high temperature there is more preferable plasticity.Additionally, containing niobium
Ti3Al base alloy has good volume stability, and it is less that thermal coefficient of expansion varies with temperature fluctuation.Therefore, containing niobium Ti3Al base
Alloy is a kind of high temperature structural material can filled up between common alloy of titanium and high temperature alloy use temperature.Containing niobium
The basis scope of Ti3Al base alloy is Ti-(20～27) Al-(11～30) Nb (at.%).
Relatively big containing differences such as fusing point, density and the vapour pressures between the niobium each element of Ti3Al alloy, bring to the preparation of alloy
Difficulty, it is serious containing niobium Ti3Al alloy niobium element segregation that Conventional processing methods is prepared, and alloying component accuracy and uniformity are difficult
To be guaranteed.For improving alloying effect and improving alloy composition uniformity, accordingly, it would be desirable to the one preferably side of preparation
Method improves the metallurgical quality containing niobium Ti3Al base alloy cast ingot.
Summary of the invention
It is an object of the invention to the shortcoming overcoming above-mentioned prior art, it is provided that a kind of quality stability high containing niobium
The preparation method of Ti3Al alloy cast ingot, the method prepare containing niobium Ti3Al alloy cast ingot composition uniformly, without phenomenons such as niobium segregations,
Improve raw material lumber recovery, reduce spillage of material.
For achieving the above object, the technical solution used in the present invention is:
A kind of preparation method containing niobium Ti3Al alloy cast ingot, first prepares pure titanium ingot casting, then is processed into by pure titanium ingot casting
Bright titanium rod, is then welded into consutrode, through 3 vacuum consumables by the bright titanium rod of acquisition with light niobium aluminium bar excellent, bright
Electric arc melting, it is thus achieved that containing niobium Ti3Al alloy cast ingot.
The present invention is further improved by, and specifically comprises the following steps that
Step 1) titanium sponge is pressed into electrode block, and assembly welding becomes consutrode；
Step 2) consutrode step 1 prepared uses more than twice vacuum consumable arc-melting to prepare finished product casting
Ingot；
Step 3) the finished product ingot casting step 2 prepared is forged, be rolled into bar, and by bar through stripping off the skin or grinding obtains
Obtain bright titanium rod；
Step 4) step 3 is obtained titanium rod with niobium rod, aluminium bar arrangement after be welded into consutrode；The mode of arrangement is concrete
For one, center niobium rod, around niobium rod arrangement one circle titanium rod, around the evenly distributed circle aluminium bar of titanium rod, and titanium rod, aluminium bar with
Niobium rod length is consistent, and titanium rod is identical with aluminium bar quantity, by adjusting titanium rod, aluminium bar, diameter that niobium is excellent control host element Al,
The content of Nb, Ti；
Step 5) melting once: consutrode step 4 prepared melting in vacuum consumable electrode arc furnace obtains an ingot；
Step 6) secondary smelting: an ingot is inverted as consutrode, vacuum consumable electrode arc furnace carries out secondary and melts
Refining obtains secondary ingot；
Step 7) three meltings: secondary ingot is inverted and in vacuum consumable electrode arc furnace, carries out three meltings as consutrode
Obtain three ingots；
Step 8) cooling: melting is cooled to less than 200 DEG C and comes out of the stove after completing, obtain containing niobium Ti3Al alloy cast ingot.
The present invention is further improved by, and in step 1, titanium sponge is more than 0 grade titanium sponge.
The present invention is further improved by, and uses plasma arc soldering method assembly welding to become consutrode in step 1.
The present invention is further improved by, in step 4 the proportioning weight ratio of aluminium bar to be prepared containing niobium Ti3Al alloy cast
In ingot, aluminium element actual mass percentage composition is high by 20%.
The present invention is further improved by, and uses plasma arc welding method to be welded into consutrode in step 4.
The present invention is further improved by, and in step 5, melting electric current is 4-8KA, and melting voltage is 25-28V.
The present invention is further improved by, and in step 6, melting electric current is 7-12KA, and melting voltage is 26-32V.
The present invention is further improved by, and in step 7, melting electric current is 7-10KA, and melting voltage is 28-32V.
The present invention is further improved by, and in step 8, cooling is carried out under vacuum or argon filling state.
Compared with prior art, beneficial effects of the present invention is as follows:
The present invention uses the mode of bar welding to prepare consutrode, eliminates and prepares intermediate alloy, and electrode pressing
The step of block, simplifies technique.Simultaneously as use the mode of titanium rod, aluminium bar and niobium rod welding to prepare consutrode, it is ensured that
In fusion process, each constituent content on same melting cross section is consistent, simultaneously because titanium is excellent, aluminium bar, niobium rod are closely knit material,
Avoid the uneven chemical components produced because of local melting speed difference or fall that block produces the metallurgical imperfection such as be mingled with.The present invention
The composition of the alloy cast ingot of preparation is uniform, overcome that niobium element segregation in prior art is serious and alloying component inaccurate with
And the problem of lack of homogeneity.
Further, the proportioning weight of aluminium bar in the present invention, use present invention preparation containing melting once during niobium Ti3Al ingot casting
Aluminium element scaling loss amount be about 20%, blending process improves the proportioning weight of aluminium element, reserved enough scaling loss amounts, it is ensured that
In final finished ingot, each constituent content meets requirement.
Further, owing to the fusing point of aluminum is lower more than 1000 DEG C than titanium, niobium, melt for aluminium bar during preventing melting once
Comparatively fast, cause aluminium element segregation, use relatively low melting electric current 4-8KA, melting voltage 25-28V when melting once, it is ensured that titanium
Rod, niobium rod, aluminium bar can melt, and also can reduce aluminium element scaling loss simultaneously.
Further, niobium rod, titanium rod, aluminium bar are outwards enclosed arrangement according to fusing point mode from high in the end from center, can profit
The characteristic being outwards gradually lowered from center by arc column temperature, alleviates the chemistry that in fusion process, each metallic element different melting points produces
Uneven components.
Detailed description of the invention
Being described in further detail the present invention in conjunction with embodiment, in the present invention, at% represents atomic number percentage composition.
Titanium rod in the present invention, aluminium bar are consistent with niobium rod length, and titanium is excellent identical with aluminium bar quantity, by adjustment titanium rod, aluminium bar,
The diameter of niobium rod controls the content of host element Al, Nb, Ti.Owing to the aluminium element scaling loss amount of melting once is about 20%, so
To be prepared the containing containing aluminium element actual mass percentage in niobium Ti3Al alloy cast ingot of the proportioning weight ratio of aluminium bar in step 4 of the present invention
Measure high by 20%, reserved enough scaling loss amounts.
Embodiment 1
As a example by preparation 120kg Ti-22at.%Al-25at.%Nb alloy cast ingot, its preparation process is as follows:
Step 1: selecting more than 0 grade titanium sponge is that raw material prepares pure titanium ingot casting, and by forged for pure titanium ingot casting, roll
The operations such as system, grinding prepare the bright titanium rod of Φ 28mm specification.
Step 2: being computed preparing 120kg Ti-22at.%Al-25at.%Nb alloy cast ingot needs Φ 62 × 2000mm
Niobium rod 1, Φ 28 × 2000mm titanium rod 10, Φ 19.5 × 2000mm aluminium bar 10, during consutrode welding titanium rod, niobium rod with
The arrangement mode of aluminium bar is: 1, center niobium rod, and the second layer is around 10 titanium rods of niobium rod close-packed arrays, and third layer is around niobium rod again
Evenly distributed 10 aluminium bars.Wherein, the Ti-22at.%Al-25at.%Nb alloy cast ingot that the proportioning weight ratio of aluminium bar is to be prepared
Middle aluminium element actual mass percentage composition is high by 20%.
Step 3: the welding mode using plasma arc welding method to design according to step 2 is excellent with niobium by titanium rod, aluminium bar
It is welded into consutrode.
Step 4: melting once, with consutrode melting in vacuum consumable electrode arc furnace of step 3 preparation, it is thus achieved that once
Ingot；Wherein, melting electric current is 4-8KA, and melting voltage is 25-28V.
Step 5: secondary smelting, carries out secondary using an ingot inversion in vacuum consumable electrode arc furnace as consutrode and melts
Refining, it is thus achieved that secondary ingot, wherein, melting electric current is 7-12KA, and melting voltage is 26-32V.
Step 6: three meltings, carries out three times using the inversion of secondary ingot in vacuum consumable electrode arc furnace as consutrode and melts
Refining, it is thus achieved that three ingots, wherein, melting electric current is 7-10KA, and melting voltage is 28-32V.
Step 7: cooling, melting requires after completing that finished ingot is cooled to less than 200 DEG C under vacuum or argon filling state and comes out of the stove,
Obtain containing niobium Ti3Al alloy cast ingot.
After the ingot casting of preparation is stripped off the skin, cuts rising head, ingot casting head, in, afterbody sampling carry out chemical composition analysis.
Host element aluminum, niobium testing result are shown in Table 1:
Table 1 Ti-22at%Al-25at%Nb alloy cast ingot aluminum, content of niobium (at%)
| Position | Head | In | Tail |
| Aluminum content | 22.54 | 22.35 | 22.27 |
| Content of niobium | 25.10 | 24.82 | 24.75 |
Embodiment 2
As a example by preparation 80kg Ti-25at.%Al-16at.%Nb alloy cast ingot, its preparation process is as follows:
Step 1: selecting more than 0 grade titanium sponge is that raw material prepares pure titanium ingot casting, and by forged for pure titanium ingot casting, roll
The operations such as system, grinding prepare the bright titanium rod of Φ 30mm specification.
Step 2: being computed preparing 80kg Ti-25at.%Al-16at.%Nb alloy cast ingot needs Φ 42.5 × 2000mm
Niobium rod 1, Φ 30 × 2000mm titanium rod 7, Φ 21.5 × 2000mm aluminium bar 7, titanium rod, niobium rod and aluminum during consutrode welding
The arrangement mode of rod is: 1, center niobium rod, the second layer is around 7 titanium rods of niobium rod close-packed arrays, and third layer is the most uniform around niobium rod
Arrange 7 aluminium bars
Step 3: the welding mode using plasma arc welding method to design according to step 2 is excellent with niobium by titanium rod, aluminium bar
It is welded into consutrode.
Step 4: melting once, with consutrode melting in vacuum consumable electrode arc furnace of step 3 preparation, it is thus achieved that once
Ingot；Wherein, melting electric current is 4-8KA, and melting voltage is 25-28V.
Step 5: secondary smelting, carries out secondary using an ingot inversion in vacuum consumable electrode arc furnace as consutrode and melts,
Refining obtains secondary ingot, and wherein, melting electric current is 7-12KA, and melting voltage is 26-32V.
Step 6: three meltings, carries out three times using the inversion of secondary ingot in vacuum consumable electrode arc furnace as consutrode and melts
Refining, it is thus achieved that three ingots, wherein, melting electric current is 7-10KA, and melting voltage is 28-32V.
Step 7: cooling, melting requires after completing that finished ingot is cooled to less than 200 DEG C under vacuum or argon filling state and comes out of the stove,
Obtain containing niobium Ti3Al alloy cast ingot.
After the ingot casting of preparation is stripped off the skin, cuts rising head, ingot casting head, in, afterbody sampling carry out chemical composition analysis.
Host element aluminum, niobium testing result are shown in Table 2:
Table 2 Ti-25at%Al-16at%Nb alloy cast ingot aluminum, content of niobium (at%)
| Position | Head | In | Tail |
| Aluminum content | 25.48 | 25.24 | 25.32 |
| Content of niobium | 16.25 | 16.18 | 16.12 |
Embodiment 3
As a example by preparation 124kg Ti-22at.%Al-27at.%Nb alloy cast ingot, its preparation process is as follows:
Step 1: selecting more than 0 grade titanium sponge is that raw material prepares pure titanium ingot casting, and by forged for pure titanium ingot casting, roll
The operations such as system, grinding prepare the bright titanium rod of Φ 27.5mm specification.
Step 2: being computed preparing 124kg Ti-22at.%Al-27at.%Nb alloy cast ingot needs Φ 65 × 2000mm
Niobium rod 1, Φ 27.5 × 2000mm titanium rod 10, Φ 19.5 × 2000mm aluminium bar 10, titanium rod, niobium rod during consutrode welding
With the arrangement mode of aluminium bar being: 1, center niobium rod, the second layer is around 10 titanium rods of niobium rod close-packed arrays, and third layer is the most uniformly arranged
10 aluminium bars of row.
Step 3: the welding mode using plasma arc welding method to design according to step 2 is excellent with niobium by titanium rod, aluminium bar
It is welded into consutrode.
Step 4: melting once, with consutrode melting in vacuum consumable electrode arc furnace of step 3 preparation, it is thus achieved that once
Ingot；Wherein, melting electric current is 4-8KA, and melting voltage is 25-28V.
Step 5: secondary smelting, carries out secondary using an ingot inversion in vacuum consumable electrode arc furnace as consutrode and melts
Refining, it is thus achieved that secondary ingot, wherein, melting electric current is 7-12KA, and melting voltage is 26-32V.
Step 6: three meltings, carries out three times using the inversion of secondary ingot in vacuum consumable electrode arc furnace as consutrode and melts
Refining, it is thus achieved that three ingots, wherein, melting electric current is 7-10KA, and melting voltage is 28-32V.
Step 7: cooling, melting requires after completing that finished ingot is cooled to less than 200 DEG C under vacuum or argon filling state and comes out of the stove,
Obtain containing niobium Ti3Al alloy cast ingot.
After the ingot casting of preparation is stripped off the skin, cuts rising head, ingot casting head, in, afterbody sampling carry out chemical composition analysis.
Host element aluminum, niobium testing result are shown in Table 3:
Table 3 Ti-22at%Al-27at%Nb alloy cast ingot aluminum, content of niobium (at%)
| Position | Head | In | Tail |
| Aluminum content | 22.41 | 22.15 | 22.12 |
| Content of niobium | 27.14 | 27.05 | 27.19 |
Embodiment 4
As a example by preparation 100kg Ti-24at.%Al-11at.%Nb alloy cast ingot, its preparation process is as follows:
Step 1: selecting more than 0 grade titanium sponge is that raw material prepares pure titanium ingot casting, and by forged for pure titanium ingot casting, roll
The operations such as system, grinding prepare the bright titanium rod of Φ 39mm specification.
Step 2: being computed preparing 100kg Ti-24at.%Al-11at.%Nb alloy cast ingot needs Φ 40 × 2000mm
Niobium rod 1, Φ 39 × 2000mm titanium rod 6, Φ 25.5 × 2000mm aluminium bar 6, titanium rod, niobium rod and aluminum during consutrode welding
The arrangement mode of rod is: 1, center niobium rod, the second layer is around 6 titanium rods of niobium rod close-packed arrays, and third layer is the most uniform around niobium rod
Arrange 6 aluminium bars.
Step 3: the welding mode using plasma arc welding method to design according to step 2 is excellent with niobium by titanium rod, aluminium bar
It is welded into consutrode.
Step 4: melting once, with consutrode melting in vacuum consumable electrode arc furnace of step 3 preparation, it is thus achieved that once
Ingot；Wherein, melting electric current is 4-8KA, and melting voltage is 25-28V.
Step 5: secondary smelting, carries out secondary using an ingot inversion in vacuum consumable electrode arc furnace as consutrode and melts
Refining, it is thus achieved that secondary ingot, wherein, melting electric current is 7-12KA, and melting voltage is 26-32V.
Step 6: three meltings, carries out three times using the inversion of secondary ingot in vacuum consumable electrode arc furnace as consutrode and melts
Refining, it is thus achieved that three ingots, wherein, melting electric current is 7-10KA, and melting voltage is 28-32V.
Step 7: cooling, melting requires after completing that finished ingot is cooled to less than 200 DEG C under vacuum or argon filling state and comes out of the stove,
Obtain containing niobium Ti3Al alloy cast ingot.
After the ingot casting of preparation is stripped off the skin, cuts rising head, ingot casting head, in, afterbody sampling carry out chemical composition analysis.
Host element aluminum, niobium testing result are shown in Table 4:
Table 4 Ti-24at%Al-11at%Nb alloy cast ingot aluminum, content of niobium (at%)
| Position | Head | In | Tail |
| Aluminum content | 24.32 | 24.25 | 24.40 |
| Content of niobium | 10.85 | 10.92 | 11.06 |
From table 1-4 it can be seen that the alloy composition uniformity prepared of embodiment 1-4 is good.
Claims (10)
1. the preparation method containing niobium Ti3Al alloy cast ingot, it is characterised in that first prepare pure titanium ingot casting, then by pure titanium
Ingot casting is processed into bright titanium rod, then the bright titanium rod of acquisition is welded into consutrode, through 3 with light niobium aluminium bar excellent, bright
Secondary vacuum consumable arc-melting, it is thus achieved that containing niobium Ti3Al alloy cast ingot.
A kind of preparation method containing niobium Ti3Al alloy cast ingot the most according to claim 1, it is characterised in that concrete steps
As follows:
Step 1) titanium sponge is pressed into electrode block, and assembly welding becomes consutrode；
Step 2) consutrode step 1 prepared uses more than twice vacuum consumable arc-melting to prepare finished product ingot casting；
Step 3) the finished product ingot casting step 2 prepared is forged, be rolled into bar, and by bar through stripping off the skin or grinding obtains light
Bright titanium rod；
Step 4) step 3 is obtained titanium rod with niobium rod, aluminium bar arrangement after be welded into consutrode；Arrangement mode particularly as follows:
One, center niobium rod, around niobium rod arrangement one circle titanium rod, around the evenly distributed circle aluminium bar of titanium rod, and titanium rod, aluminium bar and niobium
Rod length is consistent, and titanium rod is identical with aluminium bar quantity, by adjusting titanium rod, aluminium bar, diameter that niobium is excellent control host element Al, Nb,
The content of Ti；
Step 5) melting once: consutrode step 4 prepared melting in vacuum consumable electrode arc furnace obtains an ingot；
Step 6) secondary smelting: an ingot is inverted as consutrode, vacuum consumable electrode arc furnace carries out secondary smelting and obtains
Obtain secondary ingot；
Step 7) three meltings: secondary ingot is inverted and in vacuum consumable electrode arc furnace, carries out three meltings as consutrode and obtain
Three ingots；
Step 8) cooling: melting is cooled to less than 200 DEG C and comes out of the stove after completing, obtain containing niobium Ti3Al alloy cast ingot.
A kind of preparation method containing niobium Ti3Al alloy cast ingot the most according to claim 2, it is characterised in that sea in step 1
Continuous titanium is more than 0 grade titanium sponge.
A kind of preparation method containing niobium Ti3Al alloy cast ingot the most according to claim 2, it is characterised in that adopt in step 1
Consutrode is become with plasma arc soldering method assembly welding.
A kind of preparation method containing niobium Ti3Al alloy cast ingot the most according to claim 2, it is characterised in that aluminum in step 4
To be prepared high by 20% containing aluminium element actual mass percentage composition in niobium Ti3Al alloy cast ingot of proportioning weight ratio of rod.
A kind of preparation method containing niobium Ti3Al alloy cast ingot the most according to claim 2, it is characterised in that adopt in step 4
It is welded into consutrode with plasma arc welding method.
A kind of preparation method containing niobium Ti3Al alloy cast ingot the most according to claim 2, it is characterised in that molten in step 5
Refining electric current is 4-8KA, and melting voltage is 25-28V.
A kind of preparation method containing niobium Ti3Al alloy cast ingot the most according to claim 2, it is characterised in that molten in step 6
Refining electric current is 7-12KA, and melting voltage is 26-32V.
A kind of preparation method containing niobium Ti3Al alloy cast ingot the most according to claim 2, it is characterised in that molten in step 7
Refining electric current is 7-10KA, and melting voltage is 28-32V.
A kind of preparation method containing niobium Ti3Al alloy cast ingot the most according to claim 2, it is characterised in that in step 8
Cooling is carried out under vacuum or argon filling state.
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| CN108796304A (en) * | 2018-06-22 | 2018-11-13 | 江苏钛坦新材料有限公司 | A kind of γ-TiAl prealloys gas-atomized powder electrode bar and preparation method thereof |
| CN110669952A (en) * | 2019-11-01 | 2020-01-10 | 西安西工大超晶科技发展有限责任公司 | Preparation method of low-elasticity-modulus medical titanium alloy ingot |
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| CN110684908A (en) * | 2019-11-05 | 2020-01-14 | 西安西工大超晶科技发展有限责任公司 | Preparation method of homogenized titanium-aluminum alloy ingot for casting |
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| CN108796304A (en) * | 2018-06-22 | 2018-11-13 | 江苏钛坦新材料有限公司 | A kind of γ-TiAl prealloys gas-atomized powder electrode bar and preparation method thereof |
| CN111790866A (en) * | 2019-04-08 | 2020-10-20 | 中国科学院金属研究所 | Forging method and application of large-size cake blank of non-sheathed TiAl alloy |
| CN110669952A (en) * | 2019-11-01 | 2020-01-10 | 西安西工大超晶科技发展有限责任公司 | Preparation method of low-elasticity-modulus medical titanium alloy ingot |
| CN110669974A (en) * | 2019-11-05 | 2020-01-10 | 西安西工大超晶科技发展有限责任公司 | Preparation method of niobium-zirconium alloy cast ingot |
| CN110684908A (en) * | 2019-11-05 | 2020-01-14 | 西安西工大超晶科技发展有限责任公司 | Preparation method of homogenized titanium-aluminum alloy ingot for casting |
| CN112030015A (en) * | 2020-09-02 | 2020-12-04 | 中国航发北京航空材料研究院 | Vacuum consumable melting method for high-Al-content refractory high-entropy alloy cast ingot |
| CN112030015B (en) * | 2020-09-02 | 2022-03-15 | 中国航发北京航空材料研究院 | Vacuum consumable melting method for high-Al-content refractory high-entropy alloy cast ingot |
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