CN109202080A - A kind of method of selective laser fusing preparation TiAl alloy structural member - Google Patents
A kind of method of selective laser fusing preparation TiAl alloy structural member Download PDFInfo
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- CN109202080A CN109202080A CN201811209234.1A CN201811209234A CN109202080A CN 109202080 A CN109202080 A CN 109202080A CN 201811209234 A CN201811209234 A CN 201811209234A CN 109202080 A CN109202080 A CN 109202080A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/32—Process control of the atmosphere, e.g. composition or pressure in a building chamber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
- B22F10/362—Process control of energy beam parameters for preheating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
- B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The present invention provides a kind of method of selective laser fusing preparation TiAl alloy structural member, comprising: 1) dries and heat aerosolization TiAl powder；2) clamping on workbench and preheats substrate after processing；3) it is filled with operating room after inert protective gas drying and heating, operating room's oxygen content is down to 0.01% or less；4) TiAl powder is prepared with successively " low-power laser pre-sintering-high power laser fusing-low-power laser is kept the temperature " scanning mode until drip molding completes the process using selective laser smelting technology；5) drip molding is slowly cooled to room temperature in vacuum environment.The present invention prepares TiAl alloy component with " low-power laser scans pre-sintering-high power laser scanning fusing-low-power laser scanning heat preservation slow cooling " process, significantly reduce the temperature gradient and internal stress in elements during formation, the generation that restrained effectively crackle has obtained consistency height and the preferable TiAl alloy sample of comprehensive performance.
Description
Technical field
The invention belongs to alloy structure part manufacturing fields, and in particular to a kind of selective laser fusing preparation TiAl alloy structure
The method of part.
Background technique
TiAl high temperature alloy have excellent high elastic modulus, anti-corrosion, wear-resisting, high temperature resistant and excellent inoxidizability and
The advantages that flame retardant property.The material of space flight, aviation and the great competitiveness of automobile engine heat resistant structure part is had become at present.Mesh
It is preceding mainly to prepare TiAl part using the conventional methods such as hot investment casting and thermoplasticity processing.
But since its brittleness at room temperature and high temperature deformability are poor, it is caused to shape to receive and greatly limit.Room
Warm brittleness causes TiAl alloy to be easy to crack, so as to cause its hardly possible deformation, difficult processing.To prevent from cracking, the forging of TiAl alloy
Etc. thermoplasticity processings need to carry out at 1100~1300 DEG C, difficulty is big, at high cost.Meanwhile for high-performance, high-cost TiAl
Alloy material, traditional processing method can generate serious waste of raw materials, while these methods are difficult to prepare complicated precision
Structural member.As a kind of emerging nearly manufacturing process of hardware, be particularly suitable for manufacture has again metal increases material manufacturing technology
The parts such as the difficult machining titanium alloy of miscellaneous structure, high temperature alloy.Selective laser smelting technology (Selective Laser Melting,
SLM it is) forming accuracy and the best technique of Forming Quality in current all metal increases material manufacturing technologies, complex precise can be shaped
Function part.Compared with classical production process, stock utilization is greatly improved, shortens the manufacturing cycle.
Commercialization SLM device currently on the market is many kinds of, and home equipment has had developed two or more lasers
SLM device, such as in South China Science & Engineering University and Nanjing section's illuminate great mansion etc. have been developed for dual-beam SLM increase material equipment, can be same
When use two optical fiber lasers, the Central China University of Science and Technology is even more the large scale SLM device for taking the lead in having developed four light beams, shapes ruler
Very little and efficiency, which has, to be greatlyd improve.
Currently, many researchers prepare TiAl alloy using SLM technology, but the low room intrinsic due to TiAl-base alloy
Warm ductility makes TiAl alloy part be very easy to generation and splits in SLM temperature gradient produced during the preparation process and residual stress
Line influences part quality, and SLM can not also prepare fully dense TiAl alloy part at present.
Summary of the invention
In order to overcome the problems, such as that TiAl alloy complex structural member is difficult to prepare in the prior art, it is an object of the invention to mention
The method of preparation TiAl alloy structural member is melted for a kind of selective laser, the manufacturing method is first to powder, protective gas and base
Plate is heated, then by the way that " low-power laser scans pre-sintering-high power laser and scans fusing-low-power laser scanning guarantor
The technique of warm slow cooling " to heat up step by step and cool down, greatly reduces the temperature gradient and internal stress in forming process, effectively presses down
The generation for having made crackle has obtained consistency height and the preferable TiAl alloy sample of comprehensive performance.
The technical solution that the present invention is taken to achieve the above object are as follows:
A kind of method of selective laser fusing preparation TiAl alloy structural member, comprising the following steps:
Step 1: formed powder is aerosolization TiAl powder, and powder is put into vacuum oven before preparation, is evacuated to true
Reciprocal of duty cycle is 1~8Pa, and temperature is 80 DEG C, and the time is 8~12h, for use；In a vacuum drying oven in dry removable TiAl powder
Moisture simultaneously prevents TiAl powder from aoxidizing；
Step 2: removing substrate surface oxide layer using sand paper or shot blasting equipment, then cleaned with acetone and dehydrated alcohol,
Clamping on workbench and levels after drying；Substrate surface can be roughened, reduce powdering difficulty by handling substrate, and be gone
Except surface and oil contaminant and impurity are to improve the TiAl powder laying uniformity, structural member performance is improved；
Step 3: inert protective gas is passed through to device for drying and filtering to remove steam first, then passes through gas heater
It is heated, heating temperature is 100 DEG C, inert protective gas is finally filled with operating room to be formed, and make operating room to be formed
Interior oxygen content is down to 0.01% or less；
Step 4: selective laser melting unit is opened, sets basal plate preheating temperature as 200 DEG C, in the protection of inert gas
Under, workbench controls working substrate and declines a thickness, and powder supply mechanism tiles TiAl powder on the table, layer-by-layer " small function
Rate laser pre-sintering-high power laser fusing-low-power laser heat preservation " scanning is completed the process until drip molding；
Step 5: part to be formed after processing is completed, is closed argon gas valve, is vacuumized, so that forming operating room's vacuum pressure
Less than 1Pa, is closed after heating platform heat preservation 3h, be slowly cooled to room temperature drip molding in vacuum environment.
Preferably, TiAl powder described in step 1 is γ type titanium-aluminium alloy, chemical component is Ti- (45-48) Al- (1-
2) Cr- (1-5) Nb, alloy powder is spherical in shape, and partial size is 15~56 μm.
Preferably, substrate described in step 2 selects the thick pure titanium of 15~25mm or titanium alloy forging plate.
Preferably, in step 3, the inert protective gas selects high-purity argon gas, purity is 99.999~
99.9999%.
Preferably, before powdering, stand-by TiAl powder is packed into Chu Fenxiang, and use external heating device pair in step 4
Powder is heated in storage powder case, and heating temperature is 200 DEG C, and the powder of supercooling is prevented directly to be laid in solidification layer.
Preferably, working substrate described in step 4 declines a thickness, thickness δ=100 μm.
Preferably, successively " low-power laser pre-sintering-high power laser fusing-low-power laser is protected in step 4
The operating procedure of temperature " scanning are as follows: low-power laser beam is first scanned pre-sintering, improves powder temperature and sintering curing；Big function
The unlatching of rate laser beam delay is scanned fusing, and the dusty material in profile is melted, and forms a layer cross section；Low-power laser is first
The section solidified is continued to scan on after scanning through one layer, until high-power laser beam completes the scanning of a layer cross section, prevents from having coagulated
Gu section cools down rapidly；It accurately successively controls powder sintered solidification, melt, heat preservation, significantly reduce in elements during formation
Temperature gradient and internal stress, restrained effectively the generation of crackle, obtained that consistency is high, the preferable TiAl of comprehensive performance is closed
Golden sample.
It is advanced optimized as to of the invention, in step 4, successively " low-power laser pre-sintering-high power laser is molten
In change-low-power laser heat preservation " scan operation, the delay time that high-power laser beam delay is opened is 0.3~0.7s.
Preferably, in step 4, the low-power laser beam, sweep parameter are as follows: laser power P=125W, scanning speed
Spend v=2000mm/s, sweep span s=0.1mm.
Preferably, in step 4, the high-power laser beam, sweep parameter are as follows: laser power P=200W, scanning speed
Spend v=20mm/s, sweep span s=0.4mm.
The invention has the benefit that the method for the present invention first heats powder, protective gas and substrate, then lead to
Cross the heating step by step of " low-power laser scans pre-sintering-high power laser scanning fusing-low-power laser scanning heat preservation slow cooling "
TiAl alloy component is prepared with cooling process, powder sintered solidification is accurately successively controlled, melts, heat preservation, significantly reduce structure
Temperature gradient and internal stress in part forming process, restrained effectively the generation of crackle, obtain consistency height and comprehensive
It can preferable TiAl alloy sample.
Present invention employs above-mentioned technical proposals to provide a kind of method of selective laser fusing preparation TiAl alloy structural member,
Compensate for the deficiencies in the prior art, reasonable design, easy operation.
Detailed description of the invention
Fig. 1 is the drip molding section metallographic structure schematic diagram in the embodiment of the present invention 1；
Fig. 2 is the drip molding section metallographic structure schematic diagram in comparative example 2 of the invention；
Fig. 3 is the drip molding section metallographic structure schematic diagram in comparative example 3 of the invention；
Fig. 4 is the drip molding section metallographic structure schematic diagram in comparative example 4 of the invention；
Fig. 5 is the drip molding section metallographic structure schematic diagram in comparative example 5 of the invention.
Specific embodiment
The present invention provides a kind of method of selective laser fusing preparation TiAl alloy structural member, comprising:
Step 1: formed powder is aerosolization TiAl powder, and powder is put into vacuum oven before preparation, is evacuated to true
Reciprocal of duty cycle is 1~8Pa, and temperature is 80 DEG C, and the time is 8~12h, for use；In a vacuum drying oven in dry removable TiAl powder
Moisture simultaneously prevents TiAl powder from aoxidizing；
Step 2: removing substrate surface oxide layer using sand paper or shot blasting equipment, then cleaned with acetone and dehydrated alcohol,
Clamping on workbench and levels after drying；Substrate surface can be roughened, reduce powdering difficulty by handling substrate, and be gone
Except surface and oil contaminant and impurity are to improve the TiAl powder laying uniformity, structural member performance is improved；
Step 3: inert protective gas is passed through to device for drying and filtering to remove steam first, then passes through gas heater
It is heated, heating temperature is 100 DEG C, inert protective gas is finally filled with operating room to be formed, and make operating room to be formed
Interior oxygen content is down to 0.01% or less；
Step 4: selective laser melting unit is opened, sets basal plate preheating temperature as 200 DEG C, in the protection of inert gas
Under, workbench controls working substrate and declines a thickness, and powder supply mechanism tiles TiAl powder on the table, successively with " small
Power laser-high power laser-low-power laser scanning " is completed the process until drip molding；
Step 5: part to be formed after processing is completed, is closed argon gas valve, is vacuumized, so that forming operating room's vacuum pressure
Less than 1Pa, is closed after heating platform heat preservation 3h, be slowly cooled to room temperature drip molding in vacuum environment.
TiAl powder of the present invention is γ type titanium-aluminium alloy, and chemical component is Ti- (45-48) Al- (1-2) Cr- (1-5)
Nb, alloy powder is spherical in shape, and partial size is 15~56 μm.
Substrate of the present invention selects the thick pure titanium of 15~25mm or titanium alloy forging plate.
Inert protective gas of the present invention selects high-purity argon gas, and purity is 99.999~99.9999%.
In step four of the invention, before powdering, external heating device heats powder in storage powder case, and heating temperature is
200 DEG C, the powder of supercooling is prevented directly to be laid in solidification layer.
In step 4 of the present invention, working substrate declines a thickness, thickness δ=100 μm.
In step 4 of the present invention, layer-by-layer " low-power laser-high power laser-low-power laser " scanning is specific
Are as follows: successively " low-power laser pre-sintering-high power laser fusing-low-power laser heat preservation " scanning, operating procedure are as follows: small-power
Laser beam is first scanned pre-sintering, improves powder temperature and sintering curing；High-power laser beam delay unlatching is scanned molten
Change, the dusty material in profile is melted, forms a layer cross section；Low-power laser continues to scan on after first scanning through one layer have been solidified
Section prevent from having solidified section and cool down rapidly until high-power laser beam completes the scanning of a layer cross section；Accurate successively control
Powder sintered solidification is melted, heat preservation, is significantly reduced the temperature gradient and internal stress in elements during formation, is effectively pressed down
The generation for having made crackle has obtained consistency height and the preferable TiAl alloy sample of comprehensive performance.
Layer-by-layer " low-power laser pre-sintering-high power laser fusing-low-power laser heat preservation " scan operation of the invention
In, the delay time that high-power laser beam delay is opened is 0.3~0.7s.
The low-power laser beam of the invention, sweep parameter are as follows: laser power P=125W, scanning speed v=
2000mm/s, sweep span s=0.1mm.
The high-power laser beam of the invention, sweep parameter are as follows: laser power P=200W, scanning speed v=20mm/
S, sweep span s=0.4mm.
Component is by layer-by-layer with " low-power laser-high power laser-low-power laser scanning " system in the method for the present invention
The defects of standby forming, and after being slowly cooled to room temperature in vacuum environment, no hole and macroscopic cracking, TiAl drip molding consistency
It is greatly improved with tensile property.
Present invention is further described in detail with attached drawing with reference to embodiments:
Embodiment 1:
Selective laser melting unit is the M400 of Nanjing CS Raycham Laser Technology Co., Ltd., is furnished with two 500W optical fiber
Laser, spot diameter are 75 μm；Equipped with preheating platform in working chamber, maximum preheating temperature is 200 DEG C；It stores up and is installed additional on powder case
Preheating device, highest are preheated up to 200 degree.Powder uses aerosolization Ti-48Al-2Cr-2Nb (powder diameter is 15-56 μm).It is real
Testing substrate is cold rolling Ti plate, substrate size 400*400*20mm.Gas dry filter selects hundred remittance AC4010-04；Gas
Heater is absolute sincerity machinery QW-500, and maximum heating temperature is 100 DEG C.Experiment the previous day puts Ti-48Al-2Cr-2Nb powder
Enter in vacuum oven and dry, timing 12h, temperature is 80 DEG C.
Specific step is as follows:
(1) first remove the oxide skin of substrate surface with shot blasting equipment, then use acetone and dehydrated alcohol wiped clean again.So
After substrate is installed to workbench and is leveled afterwards, opens heating device and powder in storage powder case is preheated, preheating temperature is
200 DEG C, close operating room；
(2) argon gas valve is opened, high-purity argon gas (99.999%Ar) is dehumidified by device for drying and filtering and gas heater, added
It is filled with after heat in forming operating room, gas heating temperature is 100 DEG C, gas flow 1.8L/min；
(3) argon gas valve is opened, after oxygen content is down to 0.01% or less in operating room to be formed；
(4) selective laser melting unit is opened, basal plate preheating temperature is set as 200 DEG C, recalls part program,
In, low-power laser beam machined parameters are as follows: laser power P=125W, scanning speed v=2000mm/s, sweep span s=
0.1mm；High-power laser beam machined parameters are as follows: laser power P=200W, scanning speed v=20mm/s, sweep span s=
0.4mm.Operation button is clicked, under the protection of inert gas, workbench controls working substrate and declines 100 μm of thickness, powdering machine
Structure tiles TiAl powder on the table, is first scanned pre-sintering, improves powder temperature and sintering curing；High power laser
Shu Yanchi 0.5s unlatching is scanned fusing, and the dusty material in profile is melted, and forms a layer cross section；Low-power laser is first swept
The section solidified is continued to scan on after having retouched one layer, until high-power laser beam completes the scanning of a layer cross section, prevents from having solidified
Section cools down rapidly；Successively " low-power laser pre-sintering-high power laser fusing-low-power laser heat preservation " scanning is until forming
Part completes the process；
(5) after the processing is completed, argon gas valve is closed, is vacuumized, is closed after heating platform heat preservation 3h, part to be formed is true
It is taken out after being slowly cooled to room temperature in Altitude.
It is the defects of TiAl drip molding section metallographic structure observation obtained in embodiment 1, no hole and macroscopic cracking, fine and close
Degree is 99.99%, as shown in Figure 1.Parallel build direction measures the tensile strength of room-temperature mechanical property and elongation percentage is respectively
360MPa, 0.95%.Tensile strength is measured at 700 DEG C and elongation percentage is respectively 330MPa, 6.57%.
Comparative example 2:
Comparative example 2 is substantially the same manner as Example 1, the difference is that protective gas is not dehumidified and heated in step 2.
The section metallographic structure of TiAl drip molding observed stomata and macroscopic cracking defect, consistency 99.35%, as shown in Figure 2.
Comparative example 3:
Comparative example 3 is substantially the same manner as Example 1, the difference is that step 1 does not preheat powder in storage powder case.TiAl
The metallographic structure of drip molding section observed stomata and big macroscopic cracking, consistency 99.12%, as shown in Figure 3.
Comparative example 4:
Comparative example 4 is substantially the same manner as Example 1, the difference is that not preheating to substrate in step 3.TiAl drip molding
Section metallographic structure observed stomata and big macroscopic cracking, consistency 98.86%, as shown in Figure 4.
Comparative example 5:
Comparative example 5 is substantially the same manner as Example 1, the difference is that being melted in step 3 only with high power laser, does not have
Low-power laser carries out auxiliary pre-sintering and remelting.The section metallographic structure of TiAl drip molding observed big hole and macroscopic view and split
Line, consistency 96.58%, as shown in Figure 5.
The prior art of routine techniques dawn known to those skilled in the art in above-described embodiment, therefore herein no longer in detail
It repeats.
The above embodiments are only used to illustrate the present invention, and not limitation of the present invention, the ordinary skill people of this field
Member can also make a variety of changes and modification without departing from the spirit and scope of the present invention.Therefore, all equivalent
Technical solution also belong to scope of the invention, scope of patent protection of the invention should be defined by the claims.
Claims (10)
1. a kind of method of selective laser fusing preparation TiAl alloy structural member, it is characterised in that use is equipped with two lasers
Selective laser melting unit by TiAl powder with successively " low-power laser pre-sintering-high power laser fusing-low-power laser is protected
The preparation of temperature " scanning mode is completed the process until drip molding.
2. a kind of method of selective laser fusing preparation TiAl alloy structural member according to claim 1, it is characterised in that:
The sweep parameter of the low-power laser beam are as follows: laser power P=125W, scanning speed v=2000mm/s, sweep span
S=0.1mm；
The sweep parameter of the high-power laser beam are as follows: laser power P=200W, scanning speed v=20mm/s, sweep span s
=0.4mm.
3. a kind of method of selective laser fusing preparation TiAl alloy structural member according to claim 1, it is characterised in that:
Aerosolization TiAl powder: being put into vacuum oven by step 1 before preparation, dehumidifies, for use；
Step 2: removal substrate surface oxide layer, clamping on operating room's platform and levels after cleaning and drying up；
Step 3: inert protective gas is first passed through into device for drying and filtering removal steam, operating room to be formed is filled with after heating, and make
Oxygen content is down to 0.01% or less in operating room to be formed；
Step 4: selective laser melting unit is opened, 200 DEG C of basal plate preheating, under the protection of inert gas, workbench controls work
Make substrate and decline a thickness, powder supply mechanism tiles TiAl powder on the table, successively " low-power laser pre-sintering-big function
Rate laser fusing-low-power laser heat preservation " scanning is completed the process until drip molding；
Step 5: drip molding after processing is completed, is closed inert protective gas valve, is vacuumized, so that forming operating room's vacuum pressure
Power is less than 1Pa, closes after heating platform heat preservation 3h, is slowly cooled to room temperature drip molding in vacuum environment.
4. a kind of method of selective laser fusing preparation TiAl alloy structural member according to claim 1 or 3, feature exist
In: the TiAl powder is γ type titanium-aluminium alloy, and chemical component is Ti- (45-48) Al- (1-2) Cr- (1-5) Nb, and alloy powder is in
Spherical shape, partial size are 15~56 μm.
5. a kind of method of selective laser fusing preparation TiAl alloy structural member according to claim 3, it is characterised in that:
In step 2, the substrate selects the thick pure titanium of 15~25mm or titanium alloy forging plate.
6. a kind of method of selective laser fusing preparation TiAl alloy structural member according to claim 3, it is characterised in that:
In step 3, the inert protective gas selects high-purity argon gas, and purity is 99.999~99.9999%.
7. a kind of method of selective laser fusing preparation TiAl alloy structural member according to claim 3, it is characterised in that:
In the step 4, before powdering, stand-by TiAl powder is packed into Chu Fenxiang, storage powder case is heated, heating temperature is 200 DEG C.
8. a kind of method of selective laser fusing preparation TiAl alloy structural member according to claim 3, it is characterised in that:
In the step 4, working substrate decline thickness with a thickness of δ=100 μm.
9. a kind of method of selective laser fusing preparation TiAl alloy structural member according to claim 1 or 3, feature exist
In: the operating procedure of successively " low-power laser pre-sintering-high power laser fusing-low-power laser heat preservation " scanning are as follows:
Low-power laser beam is first scanned pre-sintering, improves powder temperature and sintering curing；High-power laser beam delay, which is opened, to be carried out
Scanning fusing, the dusty material in profile is melted, and forms a layer cross section；Low-power laser continues to scan on after first scanning through one layer
The section solidified is prevented from having solidified section and cooled down rapidly until high-power laser beam completes the scanning of a layer cross section.
10. a kind of method of selective laser fusing preparation TiAl alloy structural member according to claim 9, feature exist
In: the delay time that the high-power laser beam delay is opened is 0.3~0.7s.
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| WO2020152169A1 (en) * | 2019-01-21 | 2020-07-30 | Ruag Ammotec Ag | Component for a firearm, firearm, and manufacturing process for a component for a firearm |
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| WO2020152166A1 (en) * | 2019-01-21 | 2020-07-30 | Ruag Ammotec Ag | Component for a firearm, firearm, and manufacturing process for a component for a firearm |
| WO2020152169A1 (en) * | 2019-01-21 | 2020-07-30 | Ruag Ammotec Ag | Component for a firearm, firearm, and manufacturing process for a component for a firearm |
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| CN113814412A (en) * | 2021-09-18 | 2021-12-21 | 航发优材(镇江)增材制造有限公司 | Crack control method in selective laser melting process of high-strength aluminum alloy component |
| CN115502412A (en) * | 2022-09-28 | 2022-12-23 | 中国航空制造技术研究院 | Electron beam selective melting additive manufacturing method of TiAl single crystal material |
| CN117464022A (en) * | 2023-12-28 | 2024-01-30 | 西安赛隆增材技术股份有限公司 | Additive manufacturing method of gamma-TiAl alloy |
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