CN104928531A - Uniform TiAl alloy lamellar structure and preparation method thereof - Google Patents
Uniform TiAl alloy lamellar structure and preparation method thereof Download PDFInfo
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- CN104928531A CN104928531A CN201510239382.8A CN201510239382A CN104928531A CN 104928531 A CN104928531 A CN 104928531A CN 201510239382 A CN201510239382 A CN 201510239382A CN 104928531 A CN104928531 A CN 104928531A
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Abstract
The invention discloses an uniform TiAl alloy lamellar structure and a preparation method thereof, relates to a TiAl alloy and a preparation method thereof, and aims to solve the problems of weak plasticity of a traditional TiAl alloy and bad TiAl alloy performance caused by such single elements as boron and carbon refining a cast-state TiAl alloy structure. The uniform TiAl alloy lamellar structure comprises the following components in percentage by weight: 43-48% of Al, 0-2% of Cr, 0-2% of Nb, 0.5-1% of B, 0.1-1% of C and the balance of Ti; the compressive strength of the unform TiAl alloy lamellar structure is 1687-2370 MPa; and the compression ratio is 23-32%. The preparation method comprises (1) material weighing and (2) mixing; and the uniform TiAl alloy lamellar structure is prepared. The method can obtain the uniform TiAl alloy lamellar structure.
Description
Technical field
The present invention relates to a kind of TiAl alloy and preparation method thereof.
TiAl alloy is as a kind of novel high-temperature structural material, and have the advantages such as high-melting-point, low density, high elastic coefficient and good hot strength, fire retardancy, oxidation-resistance, future can be widely used in the field such as aerospace, navigation.But its temperature-room type plasticity difference hinders the widespread use of TiAl alloy, adopt the element such as boron, carbon refinement as-cast state TiAl alloy structure to reach the object improving its temperature-room type plasticity at present more.And the membership that adds of boron exists following shortcoming: one, clustering phenomena can occur in alloy melting process, most of boron separates out longer ribbon boride along crystal boundary, reduce between crystal boundary in conjunction with energy, reduce alloy strength, plasticity; Two, carbon room temperature solubility in TiAl alloy is less, and a small amount of membership segregation in TiAl alloy that adds forms bar-shaped carbide, strengthens the stress concentration in tissue, reduces TiAl alloy intensity.So need the feed postition introducing a kind of new boron, carbon at present, weaken the detrimentally affect adding separately boron, carbon alloy room-temperature property, and TiAl alloy use properties at high temperature can be improved to a certain extent.
Summary of the invention
The object of the invention is to solve the problem that the element refinement as-cast state TiAl alloy structures such as existing TiAl alloy plasticity difference and independent boron, carbon cause TiAl alloy performance bad, and a kind of homogenizing TiAl alloy lamellar microstructure and preparation method thereof is provided.
A kind of homogenizing TiAl alloy lamellar microstructure is made up of 43% ~ 48%Al, 0% ~ 2%Cr, 0% ~ 2%Nb, 0.5% ~ 1%B, 0.1% ~ 1%C and surplus Ti by weight percentage; The ultimate compression strength of described homogenizing TiAl alloy lamellar microstructure is 1687MPa ~ 2370MPa, and rate of compression is 23% ~ 32%.
A preparation method for homogenizing TiAl alloy lamellar microstructure, carries out according to the following steps:
One, weighing: by each element weight percent Al:43% ~ 48%, Cr:0% ~ 2%, Nb:0% ~ 2%, B:0.5% ~ 1%, C:0.1% ~ 1% and surplus Ti, taking aluminium ingot, aluminium niobium master alloy, chromium powder, 0 grade of titanium sponge, boracic starting material respectively and containing carbon source materials is raw material;
Two, mixing:
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be 0%, Nb element weight percent is also 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; Again size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be 0%, Nb element weight percent is not 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is divided into two parts, a copy of it 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; In the copper crucible again the aluminium niobium master alloy taken in step one being laid in smelting furnace above 0 grade of titanium sponge; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be not 0%, Nb element weight percent is 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is divided into two parts, a copy of it 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; In the copper crucible again chromium powder taken in step one being laid in smelting furnace above 0 grade of titanium sponge; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be not 0%, Nb element weight percent is not 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is divided into two parts, a copy of it 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; Again the chromium powder taken in step one and aluminium niobium master alloy are mixed, then in the copper crucible chromium powder mixed and aluminium niobium master alloy being laid in smelting furnace above 0 grade of titanium sponge; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure.
Advantage of the present invention:
One, present invention employs a kind of new method joins in TiAl alloy by boron and carbon, to optimize TiAl alloy structure property, for the practical application of alloy is provided fundamental basis;
Two, the second-phase such as boride, carbide is uniformly distributed in the TiAl alloy lamellar microstructure of homogenizing that prepared by the present invention; The microstructure of uniform small grains in TiAl alloy lamellar microstructure, improves the use properties of TiAl alloy, increases the utilization ratio of TiAl alloy, reduces the machining cost before cast alloy application;
Three, the present invention can obtain comparatively uniform microstructure, and carbide, boride tiny, be uniformly distributed between grain boundaries and synusia, concentrate precipitation to weaken at grain boundaries, reduce crackle crystal boundary expand may, raising alloy use properties;
Four, the TiAl alloy lamellar microstructure of homogenizing prepared of the present invention ultimate compression strength be 1687MPa ~ 2370MPa, rate of compression is 23% ~ 32%.
The present invention can obtain a kind of method of homogenizing TiAl alloy lamellar microstructure.
Accompanying drawing explanation
Fig. 1 is the SEM figure that the Ti-48Al alloy lamellar microstructure of embodiment one preparation amplifies 500 times;
Fig. 2 is the SEM figure that the Ti-48Al-0.8B-0.2C alloy lamellar microstructure of embodiment two preparation amplifies 1000 times;
Fig. 3 is Ti-48Al-0.2B prepared by embodiment three
4c alloy lamellar microstructure amplifies the SEM figure of 2000 times;
Fig. 4 is the SEM figure that the Ti-48Al-2Cr-2Nb alloy lamellar microstructure of embodiment four preparation amplifies 1000 times;
Fig. 5 is Ti-48Al-2Cr-2Nb-0.4B prepared by embodiment five
4c alloy lamellar microstructure amplifies the SEM figure of 1000 times.
Embodiment
Embodiment one: present embodiment is that a kind of homogenizing TiAl alloy lamellar microstructure is made up of 43% ~ 48%Al, 0% ~ 2%Cr, 0% ~ 2%Nb, 0.5% ~ 1%B, 0.1% ~ 1%C and surplus Ti by weight percentage; The ultimate compression strength of described homogenizing TiAl alloy lamellar microstructure is 1687MPa ~ 2370MPa, and rate of compression is 23% ~ 32%.
The advantage of present embodiment:
One, present embodiment have employed a kind of new method and joins in TiAl alloy by boron and carbon, to optimize TiAl alloy structure property, for the practical application of alloy is provided fundamental basis;
Two, the second-phase such as boride, carbide is uniformly distributed in the TiAl alloy lamellar microstructure of homogenizing that prepared by present embodiment; The microstructure of uniform small grains in TiAl alloy lamellar microstructure, improves the use properties of TiAl alloy, increases the utilization ratio of TiAl alloy, reduces the machining cost before cast alloy application;
Three, present embodiment can obtain comparatively uniform microstructure, and carbide, boride tiny, be uniformly distributed between grain boundaries and synusia, concentrate precipitation to weaken at grain boundaries, reduce crackle crystal boundary expand may, raising alloy use properties;
Four, the TiAl alloy lamellar microstructure of homogenizing prepared of present embodiment ultimate compression strength be 2130MPa ~ 2140MPa, rate of compression is 30% ~ 32%.
Present embodiment can obtain a kind of method of homogenizing TiAl alloy lamellar microstructure.
Embodiment two: present embodiment is that a kind of preparation method of homogenizing TiAl alloy lamellar microstructure carries out according to the following steps:
One, weighing: by each element weight percent Al:43% ~ 48%, Cr:0% ~ 2%, Nb:0% ~ 2%, B:0.5% ~ 1%, C:0.1% ~ 1% and surplus Ti, taking aluminium ingot, aluminium niobium master alloy, chromium powder, 0 grade of titanium sponge, boracic starting material respectively and containing carbon source materials is raw material;
Two, mixing:
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be 0%, Nb element weight percent is also 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; Again size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be 0%, Nb element weight percent is not 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is divided into two parts, a copy of it 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; In the copper crucible again the aluminium niobium master alloy taken in step one being laid in smelting furnace above 0 grade of titanium sponge; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be not 0%, Nb element weight percent is 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is divided into two parts, a copy of it 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; In the copper crucible again chromium powder taken in step one being laid in smelting furnace above 0 grade of titanium sponge; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be not 0%, Nb element weight percent is not 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is divided into two parts, a copy of it 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; Again the chromium powder taken in step one and aluminium niobium master alloy are mixed, then in the copper crucible chromium powder mixed and aluminium niobium master alloy being laid in smelting furnace above 0 grade of titanium sponge; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure.
The advantage of present embodiment:
One, present embodiment have employed a kind of new method and joins in TiAl alloy by boron and carbon, to optimize TiAl alloy structure property, for the practical application of alloy is provided fundamental basis;
Two, the second-phase such as boride, carbide is uniformly distributed in the TiAl alloy lamellar microstructure of homogenizing that prepared by present embodiment; The microstructure of uniform small grains in TiAl alloy lamellar microstructure, improves the use properties of TiAl alloy, increases the utilization ratio of TiAl alloy, reduces the machining cost before cast alloy application;
Three, present embodiment can obtain comparatively uniform microstructure, and carbide, boride tiny, be uniformly distributed between grain boundaries and synusia, concentrate precipitation to weaken at grain boundaries, reduce crackle crystal boundary expand may, raising alloy use properties;
Four, the TiAl alloy lamellar microstructure of homogenizing prepared of present embodiment ultimate compression strength be 1687MPa ~ 2370MPa, rate of compression is 23% ~ 32%.
Present embodiment can obtain a kind of method of homogenizing TiAl alloy lamellar microstructure.
Embodiment three: the difference of present embodiment and embodiment two is: the boracic starting material described in step 2 are boron powder, TiB
2powder or B
4c powder.Other are identical with embodiment two.
Embodiment four: the difference of present embodiment and embodiment two or three is: described in step 2 is carbon dust, TiC powder or B containing carbon source materials
4c powder.Other are identical with embodiment two or three.
Embodiment five: the difference of present embodiment and embodiment two to four is: the purity 99.9wt.% of grade titanium sponge of 0 described in step one, the purity > 99.99wt.% of aluminium ingot, the purity > 99.9wt.% of chromium powder, in aluminium niobium master alloy, Nb massfraction is 50% ~ 60%.Other are identical with embodiment two to four.
Embodiment six: the difference of present embodiment and embodiment two to five is: the particle diameter of the aluminium niobium master alloy described in step one is less than 5mm, and the particle diameter of chromium powder is less than 5mm, and the particle diameter of 0 grade of titanium sponge is less than 10mm.Other are identical with embodiment two to five.
Embodiment seven: the difference of present embodiment and embodiment two to six is: the particle diameter of described boron powder is less than 50 μm, TiB
2the particle diameter of powder is less than 50 μm, B
4the particle diameter of C powder is less than 50 μm.Other are identical with embodiment two to six.
Embodiment eight: the difference of present embodiment and embodiment two to seven is: the particle diameter of described carbon dust is less than 50 μm, the particle diameter of TiC powder is less than 50 μm, B
4the particle diameter of C powder is less than 50 μm.Other are identical with embodiment two to seven.
Embodiment nine: the difference of present embodiment and embodiment two to eight is: by each element weight percent Al:48%, B:0.8%, C:0.2% and surplus Ti in step one, taking aluminium ingot, 0 grade of titanium sponge, boracic starting material respectively and containing carbon source materials is raw material.Other are identical with embodiment two to eight.
Embodiment ten: the difference of present embodiment and embodiment two to nine is: by each element weight percent Al:48%, Cr:2%, Nb:2%, B:0.8%, C:0.2% and surplus Ti in step one, taking aluminium ingot, aluminium niobium master alloy, chromium powder, 0 grade of titanium sponge and boracic starting material respectively and containing carbon source materials is raw material.Other are identical with embodiment two to nine.
Following examples are adopted to verify advantage of the present invention:
Embodiment one: a kind of homogenizing TiAl alloy of the present embodiment lamellar microstructure is made up of 48%Al and surplus Ti by weight percentage;
The preparation method of a kind of homogenizing TiAl alloy of the present embodiment lamellar microstructure carries out according to the following steps:
One, weighing: by each element weight percent Al:48% and surplus Ti, takes aluminium ingot respectively and 0 grade of titanium sponge is raw material;
Two, the aluminium ingot taken in step one is cut into size and be less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; Again size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 15kW/min loads power to 300kW with speed, melting is melted completely to the mixing material in copper crucible, then is incubated 20min under temperature of fusion, obtains TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 500 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
The purity 99.9wt.% of grade titanium sponge of 0 described in step one, the purity > 99.99wt.% of aluminium ingot;
The particle diameter of grade titanium sponge of 0 described in step one is for being less than 10mm.
Test homogenizing TiAl alloy lamellar microstructure tensile property prepared by embodiment one, according to GB/T4338-2006 standard, under room temperature, ultimate compression strength is 1687.0MPa, and rate of compression is 23.5%.
Fig. 1 is the SEM figure that the Ti-48Al alloy lamellar microstructure of embodiment one preparation amplifies 500 times; As can be seen from Figure 1, do not add B, C element the grain-size of binary Ti-48Al alloy thicker, its grain-size is far longer than 100 μm.
Embodiment two: a kind of homogenizing TiAl alloy of the present embodiment lamellar microstructure is made up of 48%Al, 0.8%B, 0.2%C and surplus Ti by weight percentage;
The preparation method of a kind of homogenizing TiAl alloy of the present embodiment lamellar microstructure, carries out according to the following steps:
One, weighing: by each element weight percent Al:48%, B:0.8%, C:0.2% and surplus Ti, taking aluminium ingot, 0 grade of titanium sponge, boracic starting material respectively and containing carbon source materials is raw material;
Two, the aluminium ingot taken in step one is cut into size and be less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; Again size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 15kW/min loads power to 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 500 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Boracic starting material described in step 2 are boron powder; The particle diameter of described boron powder is less than 50 μm;
Described in step 2 is carbon dust containing carbon source materials; The particle diameter of described carbon dust is less than 50 μm;
The purity 99.9wt.% of grade titanium sponge of 0 described in step one, the purity > 99.99wt.% of aluminium ingot;
The particle diameter of grade titanium sponge of 0 described in step one is less than 10mm.
Test homogenizing TiAl alloy lamellar microstructure tensile property prepared by embodiment two, according to GB/T4338-2006 standard, under room temperature, ultimate compression strength is 2130.3MPa, and rate of compression is 30.1%.
Fig. 2 is the SEM figure that the Ti-48Al-0.8B-0.2C alloy lamellar microstructure of embodiment two preparation amplifies 1000 times; As can be seen from Figure 2, after adding boron powder and carbon dust in binary Ti-48Al alloy, the obvious refinement of its microstructure, its grain-size is approximately 50 ~ 100 μm.
Embodiment three: a kind of preparation method of homogenizing TiAl alloy lamellar microstructure, carry out according to the following steps:
One, weighing: by each element weight percent Al:8%, B:0.8%, C:0.2% and surplus Ti, taking aluminium ingot, 0 grade of titanium sponge, boracic starting material respectively and containing carbon source materials is raw material;
Two, the aluminium ingot taken in step one is cut into size and be less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 15kW/min loads power to 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 500 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Boracic starting material described in step 2 are B
4c powder; Described B
4the particle diameter of C powder is less than 50 μm;
Described in step 2 is B containing carbon source materials
4c powder; Described B
4the particle diameter of C powder is less than 50 μm;
The purity 99.9wt.% of grade titanium sponge of 0 described in step one, the purity > 99.99wt.% of aluminium ingot;
The particle diameter of grade titanium sponge of 0 described in step one is less than 10mm.
Test homogenizing TiAl alloy lamellar microstructure tensile property prepared by embodiment three, according to GB/T 4338-2006 standard, under room temperature, ultimate compression strength is 1936.2MPa, and rate of compression is 26.1%
Fig. 3 is Ti-48Al-0.2B prepared by embodiment three
4c alloy lamellar microstructure amplifies the SEM figure of 2000 times; As can be seen from Figure 3, B is added in binary Ti-48Al alloy
4after C, the obvious refinement of its microstructure, its grain-size is approximately 50 μm.
Embodiment four: a kind of preparation method of homogenizing TiAl alloy lamellar microstructure, carry out according to the following steps:
One, weighing: by each element weight percent Al:48%, Cr:2%, Nb:2% and surplus Ti, taking aluminium ingot, 0 grade of titanium sponge, boracic starting material respectively and containing carbon source materials is raw material;
Two, the aluminium ingot taken in step one is cut into size and be less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; Again the chromium powder taken in step one and aluminium niobium master alloy are mixed, then in the copper crucible chromium powder mixed and aluminium niobium master alloy being laid in smelting furnace above 0 grade of titanium sponge; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 15kW/min loads power to 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 500 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
The purity 99.9wt.% of grade titanium sponge of 0 described in step one, the purity > 99.99wt.% of aluminium ingot;
The particle diameter of grade titanium sponge of 0 described in step one is less than 10mm.
Test homogenizing TiAl alloy lamellar microstructure tensile property prepared by embodiment four, according to GB/T4338-2006 standard, under room temperature, ultimate compression strength is 1857.0MPa, and rate of compression is 25.4%.
Fig. 4 is the SEM figure that the Ti-48Al-2Cr-2Nb alloy lamellar microstructure of embodiment four preparation amplifies 1000 times; Do not add the Ti-48Al-2Cr-2Nb alloy of B and C, its coarse microstructure, about about 200 μm of grain-size.
Embodiment five: a kind of preparation method of homogenizing TiAl alloy lamellar microstructure, carry out according to the following steps:
One, weighing: by each element weight percent Al:48%, Cr:2%, Nb:2%, B:0.8%, C:0.2% and surplus Ti, taking aluminium ingot, aluminium niobium master alloy, chromium powder, 0 grade of titanium sponge, boracic starting material respectively and containing carbon source materials is raw material;
Two, the aluminium ingot taken in step one is cut into size and be less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is divided into two parts, a copy of it 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; Again the chromium powder taken in step one and aluminium niobium master alloy are mixed, then in the copper crucible chromium powder mixed and aluminium niobium master alloy being laid in smelting furnace above 0 grade of titanium sponge; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 15kW/min loads power to 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 500 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Boracic starting material described in step 2 are B
4c powder; Described B
4the particle diameter of C powder is less than 50 μm;
Described in step 2 is B containing carbon source materials
4c powder; Described B
4the particle diameter of C powder is less than 50 μm;
The purity 99.9wt.% of grade titanium sponge of 0 described in step one, the purity > 99.99wt.% of aluminium ingot;
The particle diameter of grade titanium sponge of 0 described in step one is less than 10mm.
Test homogenizing TiAl alloy lamellar microstructure tensile property prepared by embodiment five, according to GB/T 4338-2006 standard, under room temperature, ultimate compression strength is 2364.4MPa, and rate of compression is 31.7%.
Fig. 5 is Ti-48Al-2Cr-2Nb-0.4B prepared by embodiment five
4c alloy lamellar microstructure amplifies the SEM figure of 1000 times; B is added at Ti-48Al-2Cr-2Nb alloy
4after C, boride and carbide are evenly distributed in crystal boundary and intracrystalline, the obvious refinement of its microstructure, about about 50 μm of grain-size.
Claims (10)
1. a homogenizing TiAl alloy lamellar microstructure, is characterized in that a kind of homogenizing TiAl alloy lamellar microstructure is made up of 43% ~ 48%Al, 0% ~ 2%Cr, 0% ~ 2%Nb, 0.5% ~ 1%B, 0.1% ~ 1%C and surplus Ti by weight percentage; The ultimate compression strength of described homogenizing TiAl alloy lamellar microstructure is 1687MPa ~ 2370MPa, and rate of compression is 23% ~ 32%.
2. the preparation method of a kind of homogenizing TiAl alloy lamellar microstructure as claimed in claim 1, is characterized in that a kind of preparation method of homogenizing TiAl alloy lamellar microstructure carries out according to the following steps:
One, weighing: by each element weight percent Al:43% ~ 48%, Cr:0% ~ 2%, Nb:0% ~ 2%, B:0.5% ~ 1%, C:0.1% ~ 1% and surplus Ti, taking aluminium ingot, aluminium niobium master alloy, chromium powder, 0 grade of titanium sponge, boracic starting material respectively and containing carbon source materials is raw material;
Two, mixing:
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be 0%, Nb element weight percent is also 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; Again size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be 0%, Nb element weight percent is not 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is divided into two parts, a copy of it 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; In the copper crucible again the aluminium niobium master alloy taken in step one being laid in smelting furnace above 0 grade of titanium sponge; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be not 0%, Nb element weight percent is 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is divided into two parts, a copy of it 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; In the copper crucible again chromium powder taken in step one being laid in smelting furnace above 0 grade of titanium sponge; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure;
Specifically carry out according to the following steps when the Cr element weight percent taken in step one be not 0%, Nb element weight percent is not 0%:
The aluminium ingot taken in step one is cut into size and is less than 10cm
3aluminium block; Again take in step one 0 grade of titanium sponge is divided into two parts, a copy of it 0 grade of titanium sponge is joined in the copper crucible of smelting furnace; Again the chromium powder taken in step one and aluminium niobium master alloy are mixed, then in the copper crucible chromium powder mixed and aluminium niobium master alloy being laid in smelting furnace above 0 grade of titanium sponge; In the copper crucible of smelting furnace, add another part 0 grade of titanium sponge again, then size is less than 10cm
3aluminium block be placed on 0 grade of titanium sponge; Again by the boracic starting material taken in step one with join in the secondary charging bucket of smelting furnace containing carbon source materials, vacuum tightness is evacuated to smelting furnace and reaches 10
-3mbar, be then that 10kW/min ~ 20kW/min loads power to 200kW ~ 300kW with speed, melting is melted completely to the mixing material in copper crucible, obtains alloy melt; Then by the boracic starting material in secondary charging bucket with join in alloy melt containing carbon source materials, be heated to alloy melting, and be incubated 15min ~ 20min at alloy melting temperature, obtain TiAl alloy melt; Then copper crucible is overturn, then TiAl alloy melt to be poured into temperature be in the steel die of 400 DEG C ~ 600 DEG C, in melting body of heater, be filled with argon gas after 1min, then blow-on, then naturally cool to room temperature, obtain homogenizing TiAl alloy lamellar microstructure.
3. the preparation method of a kind of homogenizing TiAl alloy lamellar microstructure according to claim 2, is characterized in that the boracic starting material described in step 2 are boron powder, TiB
2powder or B
4c powder.
4. the preparation method of a kind of homogenizing TiAl alloy lamellar microstructure according to claim 2, it is characterized in that described in step 2 containing carbon source materials be carbon dust, TiC powder or B
4c powder.
5. the preparation method of a kind of homogenizing TiAl alloy lamellar microstructure according to claim 2, it is characterized in that the purity 99.9wt.% of grade titanium sponge of 0 described in step one, the purity > 99.99wt.% of aluminium ingot, the purity > 99.9wt.% of chromium powder, in aluminium niobium master alloy, Nb massfraction is 50% ~ 60%.
6. the preparation method of a kind of homogenizing TiAl alloy lamellar microstructure according to claim 2, it is characterized in that the particle diameter of the aluminium niobium master alloy described in step one is less than 5mm, the particle diameter of chromium powder is less than 5mm, and the particle diameter of 0 grade of titanium sponge is less than 10mm.
7. the preparation method of a kind of homogenizing TiAl alloy lamellar microstructure according to claim 3, is characterized in that the particle diameter of described boron powder is less than 50 μm, TiB
2the particle diameter of powder is less than 50 μm, B
4the particle diameter of C powder is less than 50 μm.
8. the preparation method of a kind of homogenizing TiAl alloy lamellar microstructure according to claim 4, it is characterized in that the particle diameter of described carbon dust is less than 50 μm, the particle diameter of TiC powder is less than 50 μm, B
4the particle diameter of C powder is less than 50 μm.
9. the preparation method of a kind of homogenizing TiAl alloy lamellar microstructure according to claim 2, it is characterized in that taking aluminium ingot, 0 grade of titanium sponge, boracic starting material respectively and containing carbon source materials is raw material by each element weight percent Al:48%, B:0.8%, C:0.2% and surplus Ti in step one.
10. the preparation method of a kind of homogenizing TiAl alloy lamellar microstructure according to claim 2, it is characterized in that taking aluminium ingot, aluminium niobium master alloy, chromium powder, 0 grade of titanium sponge and boracic starting material respectively and containing carbon source materials is raw material by each element weight percent Al:48%, Cr:2%, Nb:2%, B:0.8%, C:0.2% and surplus Ti in step one.
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| CN110643877A (en) * | 2019-09-09 | 2020-01-03 | 中国航发北京航空材料研究院 | TiAl intermetallic compound containing W, Mn, Si, B, C and rare earth elements |
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| CN112359262A (en) * | 2020-11-20 | 2021-02-12 | 重庆理工大学 | Strengthening and toughening titanium-aluminum-based composite material and preparation method thereof |
| CN112410642A (en) * | 2020-11-20 | 2021-02-26 | 重庆理工大学 | Titanium-aluminum-based composite material and preparation method thereof |
| CN112626373A (en) * | 2020-11-20 | 2021-04-09 | 重庆理工大学 | High-temperature titanium-aluminum alloy and preparation method thereof |
| CN116334447A (en) * | 2023-03-23 | 2023-06-27 | 北京科技大学 | Preparation method of C-containing high Nb-TiAl alloy |
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