CN103820673A - W and V alloying beta phase solidifying high Nb-TiAl alloy and preparation method thereof - Google Patents
W and V alloying beta phase solidifying high Nb-TiAl alloy and preparation method thereof Download PDFInfo
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- CN103820673A CN103820673A CN201410090526.3A CN201410090526A CN103820673A CN 103820673 A CN103820673 A CN 103820673A CN 201410090526 A CN201410090526 A CN 201410090526A CN 103820673 A CN103820673 A CN 103820673A
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- 239000000956 alloy Substances 0.000 title claims abstract description 113
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 109
- 229910010038 TiAl Inorganic materials 0.000 title claims abstract description 47
- 229910052721 tungsten Inorganic materials 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 15
- 238000005275 alloying Methods 0.000 title abstract 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 28
- 230000006698 induction Effects 0.000 claims abstract description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 21
- -1 aluminium tungsten niobium Chemical compound 0.000 claims abstract description 21
- 229910052802 copper Inorganic materials 0.000 claims abstract description 21
- 239000010949 copper Substances 0.000 claims abstract description 21
- 239000010936 titanium Substances 0.000 claims abstract description 16
- PEQFPKIXNHTCSJ-UHFFFAOYSA-N alumane;niobium Chemical compound [AlH3].[Nb] PEQFPKIXNHTCSJ-UHFFFAOYSA-N 0.000 claims abstract description 15
- PTXMVOUNAHFTFC-UHFFFAOYSA-N alumane;vanadium Chemical compound [AlH3].[V] PTXMVOUNAHFTFC-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000010955 niobium Substances 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 11
- 239000000725 suspension Substances 0.000 claims abstract description 10
- 239000004411 aluminium Substances 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910000756 V alloy Inorganic materials 0.000 claims description 26
- 238000002844 melting Methods 0.000 claims description 26
- 230000008018 melting Effects 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 12
- 238000009750 centrifugal casting Methods 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 8
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 239000004484 Briquette Substances 0.000 claims description 6
- 238000003475 lamination Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 abstract description 10
- 238000005204 segregation Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000000155 melt Substances 0.000 abstract 3
- 238000005058 metal casting Methods 0.000 abstract 1
- 238000003825 pressing Methods 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 15
- 244000137852 Petrea volubilis Species 0.000 description 6
- 238000002441 X-ray diffraction Methods 0.000 description 6
- 241000446313 Lamella Species 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000010892 electric spark Methods 0.000 description 3
- 238000005088 metallography Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000004626 scanning electron microscopy Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229960000935 dehydrated alcohol Drugs 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Abstract
The invention relates to a W and V alloying beta phase solidifying high Nb-TiAl alloy and a preparation method thereof, and belongs to the field of alloy technology. The alloy comprises the following elements by mole: 43%-45% of Al, 5%-15% of Nb, less than or equal to 0.4% of W, less than or equal to 0.5% of V, and the balance of Ti and inevitable impurities. The preparation method comprises the following steps: raw materials are subjected to briquetting forming according to constitutions, titanium sponges are placed on the edge of the inner side of a mould firstly, a high purity aluminium layer, an aluminium niobium intermediate alloy layer, an aluminium vanadium intermediated alloy layer, an aluminium tungsten niobium intermediate alloy layer and a titanium sponge layer are arranged from bottom to top respectively; pressing cakes are placed into a water-cooling copper crucible vacuum induction suspension smelting furnace capable of centrifugal pressure casting for vacuum smelting to obtain melts and the melts are enabled to be mixed uniformly; the melts are cast in a metal casting mould that is preheated in advance and centrifugally rotates for centrifugal rotating and casting and cooled with the furnace. According to the invention, a TiAl alloy that is homogeneous and fine in structure and has no obvious segregation is obtained.
Description
Technical field
The present invention relates to a kind of high Nb-TiAl alloy and preparation technology thereof, relate in particular to a kind of W, V alloy β and solidify mutually high Nb-TiAl Alloy And Preparation Method, belong to alloy technology field.
Background technology
TiAl alloy is due to advantages such as its low density, low-expansion coefficient, high specific strength, high elastic coefficient and good high temperature and creep resistance antioxidant properties, the lightening fire resistant structured material that is considered to have very much application prospect, can be applicable to the field such as Aeronautics and Astronautics and automotive industry.At present, GE company has been successfully applied to two grade blades after Boeing 787 passenger plane GEnx engine low-pressure turbines, Mitsubishi also by TiAl Alloyapplication in automobile charging turbine.But, the drawbacks limit such as the low and hot workability of TiAl alloy plasticity is poor its widespread use, therefore the carrying out of preparation shaping, organizational controls and the machining deformation aspect of scientific worker to TiAl alloy large quantity research, result shows, β solidifies mechanical property and the hot workability that can effectively improve TiAl alloy mutually.Along with the raising day by day of people TiAl alloy high-temp performance requriements, Nb element becomes the important element that effectively improves hot strength and high-temperature oxidation resistance in TiAl alloy, high Nb-TiAl alloy also becomes the key areas of TiAl alloy research, and β solidifies TiAl alloy mutually becomes an important research direction.Now, in order further to improve the performance that β solidifies high Nb-TiAl alloy mutually, important β phase stable element is added into wherein, and the physical metallurgy behavior being added in high Nb-TiAl alloy when W and V there is not yet play-by-play.
Summary of the invention
The object of this invention is to provide and a kind ofly make alloy graining route solidify and be transformed into β and solidify mutually by traditional Peritectic Reaction by add polynary β phase stable element W and V in the process of alloy melting, and then the W, the V alloy β that improve alloy material structure property solidify high Nb-TiAl alloy material and preparation method thereof mutually.
W of the present invention, V alloy β solidify high Nb-TiAl alloy material mutually, it is characterized in that, the molar content of its element is: 43～45% Al, 5～15%(preferably 8%) Nb, not higher than 0.4% W, not higher than the Ti of 0.5% V and surplus and inevitable impurity.
The preparation method that W of the present invention, V alloy β solidify high Nb-TiAl alloy mutually, realizes by following step:
(1), take following raw material: titanium sponge, rafifinal, aluminium niobium master alloy, aluminium tungsten niobium master alloy and aluminium vanadium master alloy; The Al that the molar content of wherein controlling Al, Nb, W, V and Ti element is 43%～45%, 5～15% Nb, not higher than 0.4% W, be not Ti and inevitable impurity higher than 0.5% V and surplus;
(2), step (1) is claimed raw material carry out compound stalk forming by metallic briquette machine, when briquetting, first titanium sponge is placed in to mould surrounding inside edge, bottom, region that then titanium sponge surrounds from bottom to top each layer be respectively high-purity aluminium lamination, aluminium niobium master alloy layer, aluminium vanadium master alloy layer, aluminium tungsten niobium master alloy layer and sponge titanium layer;
(3) briquetting step (2) being obtained put into can the water jacketed copper crucible vacuum induction suspension smelting furnace of centrifugal casting in, before melting, by metallic mould mould and die preheating to 300～500 ℃, water jacketed copper crucible vacuum induction melting furnace is evacuated to 1.0～3.0 × 10
-3mbar, with the preferred 20kw/min of 20～30kw/min() rate of rise stops increasing power after water jacketed copper crucible vacuum induction melting furnace monitor system is risen to 160～180kw, and then under firm power, melting 200～300s obtains melt, makes melt-mixing even;
(4) melt in step (3) is cast in metallic mould mould in advance preheated and centrifugal rotation, centrifuge speed is preferably 140r/min, and form containing W, V alloy β and solidify mutually high Nb-TiAl alloy cast ingot, and furnace cooling.
In step of the present invention (1), the quality purity of titanium sponge is 99.78%, the quality purity of rafifinal is 99.99%, the quality purity of aluminium niobium master alloy is 99.86%, and the quality purity of aluminium tungsten niobium master alloy is 99.69%, and the quality purity of aluminium vanadium master alloy is 99.6%; Each raw material is commercially available prod.
The present invention has determined the optimal addn scope of W and V, in Material Coagulating Process, W and V add the route that solidifies that has changed alloy, by traditional L → L+ β → α → ... become L → L+ β → β → ... the high Nb-TiAl alloy microscopic structure obtaining is very tiny, and without obviously segregation appearance, the β of formation mainly appears at mutually lamella colony grain boundaries and is net distribution.Tiny tissue even, the obvious segregation of nothing is conducive to the hot workability of alloy, improves the over-all properties of alloy.
The present invention obtained even tiny and without obvious segregation TiAl alloy structure, and adopt water jacketed copper crucible vacuum induction suspension smelting furnace melting and carry out centrifugal casting, technological process is simple to operation.
Accompanying drawing explanation
W, the V alloy β of Fig. 1 embodiment 1 solidifies the high Nb-TiAl alloy Ti-45Al-8Nb-0.4W-0.5V cast alloy figure of optical microstructure mutually;
W, the V alloy β of Fig. 2 embodiment 1 solidifies high Nb-TiAl alloy Ti-45Al-8Nb-0.4W-0.5V cast alloy X-ray diffraction spectrogram mutually;
W, the V alloy β of Fig. 3 embodiment 1 solidifies high Nb-TiAl alloy Ti-45Al-8Nb-0.4W-0.5V cast alloy scanning electron microscopy mutually;
W, the V alloy β of Fig. 4 embodiment 2 solidifies the high Nb-TiAl alloy Ti-43Al-8Nb-0.1W-0.1V cast alloy figure of optical microstructure mutually;
W, the V alloy β of Fig. 5 embodiment 2 solidifies high Nb-TiAl alloy Ti-43Al-8Nb-0.1W-0.1V cast alloy X-ray diffraction spectrogram mutually;
W, the V alloy β of Fig. 6 embodiment 2 solidifies high Nb-TiAl alloy Ti-43Al-8Nb-0.1W-0.1V cast alloy scanning electron microscopy mutually;
W, the V alloy β of Fig. 7 embodiment 3 solidifies the high Nb-TiAl alloy Ti-44Al-8Nb-0.2W-0.5V cast alloy figure of optical microstructure mutually;
W, the V alloy β of Fig. 8 embodiment 3 solidifies high Nb-TiAl alloy Ti-44Al-8Nb-0.2W-0.5V cast alloy X-ray diffraction spectrogram mutually;
W, the V alloy β of Fig. 9 embodiment 3 solidifies high Nb-TiAl alloy Ti-44Al-8Nb-0.2W-0.5V cast alloy scanning electron microscopy mutually.
Embodiment
Below in conjunction with embodiment, the present invention will be further described, but the present invention is not limited to following examples.The capacity of following vacuum induction suspension smelting furnace is 5 kilograms.
Embodiment 1
W, the V alloy β of the present embodiment solidifies high Nb-TiAl alloy preparation mutually to be realized by following step: one, take following raw material: titanium sponge, rafifinal, aluminium niobium master alloy, aluminium tungsten niobium master alloy and aluminium vanadium master alloy, wherein Ti46.1at.%, Al45at.%, Nb8at.%, W0.4at.%, V0.5at.%; Two, step 1 is claimed raw material carry out compound stalk forming by metallic briquette machine, when briquetting, first titanium sponge is placed in to mould surrounding inside edge, bottom, region that then titanium sponge surrounds from bottom to top each layer be respectively high-purity aluminium lamination, aluminium niobium master alloy layer, aluminium vanadium master alloy layer, aluminium tungsten niobium master alloy layer and sponge titanium layer; Three, briquetting step 2 being obtained put into can the water jacketed copper crucible vacuum induction suspension smelting furnace of centrifugal casting in, before melting, metallic mould is preheated to 400 ℃, water jacketed copper crucible vacuum induction melting furnace is evacuated to 2.0 × 10
-3mbar; Four, stop increasing power after water jacketed copper crucible vacuum induction melting furnace monitor system being risen to 180kw with 20kw/min rate of rise, then under firm power, melting 300s obtains melt, makes melt-mixing even; Five, melt is cast in metallic mould after preheating and centrifugal rotation, centrifuge speed is preferably 140r/min, and ingot casting is of a size of φ 60 × 180mm, and furnace cooling, obtains Ti-45Al-8Nb-0.4W-0.5V alloy cast ingot.
Adopt electric spark wire cutting method to cut 15 × 15 × 10mm sample from ingot casting.Metallographic and scanned sample are ground to 3000 orders through abrasive paper for metallograph from 180 orders, then on polished machine, carry out mechanical polishing, throw afterwards by electropolisher, essence again; X-ray diffraction sample is ground to 1000 orders through washing sand paper from 180 orders, then uses ultrasonic oscillator clean surface; Transmission sample is the thin slice that 0.5mm is thick, is ground to 40um thick with sand paper, then adopts the preparation of two spray thinning technique.Utilize the microstructure of metallography microscope sem observation Ti-45Al-8Nb-0.4W-0.5V to find, TiAl alloy be organized as tiny equiaxed grain structure, see Fig. 1; Utilize XRD (X-ray diffractometer) to analyze discovery, in alloy except α
2outside γ phase, also have β to occur mutually, see Fig. 2; Utilize scanning electronic microscope and electronic probe to analyze discovery, white exposes and is mainly distributed in lamella colony grain boundaries and is net distribution, sees Fig. 3.
W, the V alloy β of the present embodiment solidifies high Nb-TiAl alloy preparation mutually to be realized by following step: one, take following raw material: titanium sponge, rafifinal, aluminium niobium master alloy, aluminium tungsten niobium master alloy and aluminium vanadium master alloy, wherein Ti48.8at.%, Al43at.%, Nb8at.%, W0.1at.%, V0.1at%; Two, step 1 is claimed raw material carry out compound stalk forming by metallic briquette machine, when briquetting, first titanium sponge is placed in to mould surrounding inside edge, bottom, region that then titanium sponge surrounds from bottom to top each layer be respectively high-purity aluminium lamination, aluminium niobium master alloy layer, aluminium vanadium master alloy layer, aluminium tungsten niobium master alloy layer and sponge titanium layer; Three, briquetting step 2 being obtained put into can the water jacketed copper crucible vacuum induction suspension smelting furnace of centrifugal casting in, before melting, by metallic mould mould and die preheating to 300 ℃, water jacketed copper crucible vacuum induction melting furnace is evacuated to 1.5 × 10
-3mbar; Four, stop increasing power after water jacketed copper crucible vacuum induction melting furnace monitor system being risen to 160kw with 20kw/min rate of rise, then under firm power, melting 200s obtains melt, makes melt-mixing even; Five, melt is cast in metallic mould after preheating and centrifugal rotation, centrifuge speed is preferably 140r/min, and ingot casting is of a size of φ 60 × 180mm, and furnace cooling, obtains Ti-43Al-8Nb-0.1W-0.1Cr compound ingot casting.
Adopt electric spark wire cutting method to cut 15 × 15 × 10mm sample from ingot casting, metallographic and scanned sample are ground to 3000 orders through abrasive paper for metallograph from 180 orders, then throw with electropolisher, is smart; X-ray diffraction sample is ground to 1000 orders through washing sand paper from 180 orders, then to use dehydrated alcohol clean surface, transmission sample be the thin slice that 0.5mm is thick, is ground to 40um thick with sand paper, then adopts the preparation of two spray thinning techniques.Utilize the microstructure of metallography microscope sem observation Ti-43Al-8Nb-0.1W-0.1Cr to find, the tissue of TiAl alloy is tiny equiaxed grain structure, sees Fig. 4; Utilize XRD (X-ray diffractometer) to analyze discovery, in alloy except α
2outside γ phase, also have β to occur mutually, see Fig. 5; Utilize scanning electronic microscope and electronic probe to analyze discovery, white exposes and is mainly distributed in lamella colony grain boundaries and is net distribution, sees Fig. 6.
Embodiment 3
W, the V alloy β of the present embodiment solidifies high Nb-TiAl alloy preparation mutually to be realized by following step: one, take following raw material: titanium sponge, rafifinal, aluminium niobium master alloy, aluminium tungsten niobium master alloy and aluminium vanadium master alloy, wherein Ti47.3at.%, Al44at.%, Nb8at.%, W0.2at.%, V0.5at%; Two, step 1 is claimed raw material carry out compound stalk forming by metallic briquette machine, when briquetting, first titanium sponge is placed in to mould surrounding inside edge, bottom, region that then titanium sponge surrounds from bottom to top each layer be respectively high-purity aluminium lamination, aluminium niobium master alloy layer, aluminium vanadium master alloy layer, aluminium tungsten niobium master alloy layer and sponge titanium layer; Three, briquetting step 2 being obtained put into can the water jacketed copper crucible vacuum induction suspension smelting furnace of centrifugal casting in, before melting, by metallic mould mould and die preheating to 450 ℃, water jacketed copper crucible vacuum induction melting furnace is evacuated to 2.0 × 10
-3mbar; Four, stop increasing power after water jacketed copper crucible vacuum induction melting furnace monitor system being risen to 170kw with 20kw/min rate of rise, then under firm power, melting 260s obtains melt, makes melt-mixing even; Five, melt is cast in metallic mould after preheating and centrifugal rotation, centrifuge speed is preferably 140r/min, and ingot casting is of a size of φ 60 × 180mm, and furnace cooling, obtains Ti-44Al-8Nb-0.2W-0.5V compound ingot casting.
Adopt electric spark wire cutting method to cut 15 × 15 × 10mm sample from ingot casting, metallographic and scanned sample are ground to 3000 orders through abrasive paper for metallograph from 180 orders, then throw with electropolisher, is smart; X-ray diffraction sample is ground to 1000 orders through washing sand paper from 180 orders, then to use dehydrated alcohol clean surface, transmission sample be the thin slice that 0.5mm is thick, is ground to 40um thick with sand paper, then adopts the preparation of two spray thinning techniques.Utilize the microstructure of metallography microscope sem observation Ti-44Al-8Nb-0.2W-0.5V to find, the tissue of TiAl alloy is tiny equiaxed grain structure, sees Fig. 7; Utilize XRD (X-ray diffractometer) to analyze discovery, in alloy except α
2outside γ phase, also have β to occur mutually, see Fig. 8; Utilize scanning electronic microscope and electronic probe to analyze discovery, white exposes and is mainly distributed in lamella colony grain boundaries and is net distribution, sees Fig. 9.
Embodiment 4
(1), take following raw material: titanium sponge, rafifinal, aluminium niobium master alloy, aluminium tungsten niobium master alloy and aluminium vanadium master alloy; The Al that the molar content of wherein controlling Al, Nb, W, V and Ti element is 43%～45%, 8% Nb, 0.1～0.4% W, 0.1～0.5% V and Ti and the impurity of surplus;
(2), step (1) is claimed raw material carry out compound stalk forming by metallic briquette machine, when briquetting, first titanium sponge is placed in to mould surrounding inside edge, the region then surrounding at titanium sponge bottom from bottom to top each layer be respectively high-purity aluminium lamination, aluminium niobium master alloy layer, aluminium vanadium master alloy layer, aluminium tungsten niobium master alloy layer and sponge titanium layer;
(3) briquetting step (2) being obtained put into can the water jacketed copper crucible vacuum induction suspension smelting furnace of centrifugal casting in, before melting, by metallic mould mould and die preheating to 300～500 ℃, water jacketed copper crucible vacuum induction melting furnace is evacuated to 1.0～3.0 × 10
-3mbar, with the preferred 20kw/min of 20～30kw/min() rate of rise stops increasing power after water jacketed copper crucible vacuum induction melting furnace monitor system is risen to 160～180kw, and then under firm power, melting 200～300s obtains melt, makes melt-mixing even;
(4) melt in step (3) is cast in metallic mould mould in advance preheated and centrifugal rotation, centrifuge speed is preferably 140r/min, and form containing W, V alloy β and solidify mutually high Nb-TiAl alloy cast ingot, and furnace cooling.
W, the V alloy β that adopts the sign identical with embodiment 3 with embodiment 1, embodiment 2 to obtain solidifies the tiny even and obviously segregation of nothing of high Nb-TiAl alloy material microstructure mutually, in tissue, there is the β phase of brilliant white, be mainly distributed in lamella colony grain boundaries and be net distribution.
Claims (8)
1. W, V alloy β solidify a high Nb-TiAl alloy mutually, it is characterized in that the molar content of element: 43%～45% Al, 5～15% Nb, not higher than 0.4% W, not higher than the Ti of 0.5% V and surplus and inevitable impurity.
2. solidify mutually high Nb-TiAl alloy according to a kind of W of claim 1, V alloy β, it is characterized in that, the molar content 8% of Nb, the molar content of W not higher than the molar content of 0.4%, V not higher than 0.5%.
3. solidify mutually high Nb-TiAl alloy according to a kind of W of claim 1, V alloy β, it is characterized in that, the molar content 8% of Nb, the molar content 0.1-0.4% of W, the molar content of V is not higher than 0.5%.
4. solidify mutually high Nb-TiAl alloy according to a kind of W of claim 1, V alloy β, it is characterized in that, the molar content 8% of Nb, the molar content 0.1-0.4% of W, the molar content 0.1-0.5% of V.
The preparation method that 5.W, V alloy β solidify high Nb-TiAl alloy mutually, is characterized in that, comprises the steps:
(1), take following raw material: titanium sponge, rafifinal, aluminium niobium master alloy, aluminium tungsten niobium master alloy and aluminium vanadium master alloy; The Al that the molar content of wherein controlling Al, Nb, W, V and Ti element is 43%～45%, 5～15% Nb, not higher than 0.4% W, be not Ti and inevitable impurity higher than 0.5% V and surplus;
(2), step (1) is claimed raw material carry out compound stalk forming by metallic briquette machine, when briquetting, first titanium sponge is placed in to mould surrounding inside edge, bottom, the region then surrounding at titanium sponge from bottom to top each layer of placement is respectively high-purity aluminium lamination, aluminium niobium master alloy layer, aluminium vanadium master alloy layer, aluminium tungsten niobium master alloy layer and sponge titanium layer;
(3) briquetting step (2) being obtained put into can the water jacketed copper crucible vacuum induction suspension smelting furnace of centrifugal casting in, before melting, by metallic mould mould and die preheating to 300～500 ℃, water jacketed copper crucible vacuum induction melting furnace is evacuated to 1.0～3.0 × 10
-3mbar, stops increasing power after water jacketed copper crucible vacuum induction melting furnace monitor system being risen to 160～180kw with 20～30kw/min rate of rise, and then under firm power, melting 200～3000s obtains melt, makes melt-mixing even;
(4) melt in step (3) is cast in metallic mould mould in advance preheated and centrifugal rotation, forms W, V alloy β and solidify mutually high Nb-TiAl alloy cast ingot, and furnace cooling.
6. according to the method for claim 5, it is characterized in that, with 20kw/min rate of rise, water jacketed copper crucible vacuum induction suspension smelting furnace monitor system is risen to 160～180kw and carries out centrifugal casting forming.
7. according to the method for claim 5, it is characterized in that, centrifuge speed is preferably 140r/min.
8. according to the method for claim 5, it is characterized in that, (1) in, the quality purity of titanium sponge is 99.78%, the quality purity of rafifinal is 99.99%, the quality purity of aluminium niobium master alloy is 99.86%, the quality purity of aluminium tungsten niobium master alloy is 99.69%, and the quality purity of aluminium vanadium master alloy is 99.6%.
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| CN107127341A (en) * | 2017-04-10 | 2017-09-05 | 西安铂力特激光成形技术有限公司 | A kind of quick forming method of TiAl alloy part |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107127341A (en) * | 2017-04-10 | 2017-09-05 | 西安铂力特激光成形技术有限公司 | A kind of quick forming method of TiAl alloy part |
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