CN107716934A - A kind of preparation method of Inconel718 alloy powders for 3D printing technique - Google Patents
A kind of preparation method of Inconel718 alloy powders for 3D printing technique Download PDFInfo
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- B22F9/00—Making metallic powder or suspensions thereof
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- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
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- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
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- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
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- 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
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- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
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Abstract
The present invention relates to a kind of preparation method of the Inconel718 alloy powders for 3D printing technique, this method uses process for vacuum induction smelting and Close-Coupled Gas Atomization technology, grain size proportion is carried out to powder with ultrasonic vibration, air current classifying method, and by vacuum degassing technology, the Inconel718 alloy powders suitable for selective laser smelting technology are prepared.Compared with prior art, the performance characteristics such as Inconel718 alloy powders prepared by the present invention have sphericity height, even particle size distribution, oxygen content is low, impurity content is low, performance requirement of the selective laser smelting technology to dusty material is met, promotes the development of metal increases material manufacturing technology.
Description
Technical field
The present invention relates to a kind of preparation method of metal dust, more particularly, to a kind of for 3D printing technique
The preparation method of Inconel718 alloy powders, belongs to material increasing field.
Background technology
3D printing is a kind of using means such as laser or electron beams, according to three-dimensional modeling, is successively added under the control of the computer
Add accumulation material that the manufacturing technology of part is directly quickly precisely formed, also referred to as " increasing material manufacturing ".Increases material manufacturing technology need not pass
Cutter, fixture and the multi-step process of system, can rapidly and precisely it be produced in an equipment using three-dimensional design data
The part of arbitrarily complicated shape, the traditional processing of (or deformation) and common special processing technology are removed compared to material, increases material
Manufacturing technology has high stock utilization.
Selective laser smelting technology (Selective Laser Melting, SLM) is one kind of metal parts straight forming
Method, it is the latest development of metal increases material manufacturing technology.Most basic thought of the technology based on rapid shaping, i.e. successively cladding
" increment " manufacture, has the part of geometry in particular according to threedimensional model straight forming, metal dust in forming process
It is completely melt, produces metallurgical binding.SLM can produce the shape and structure that can not be manufactured using traditional machining means
Complicated metal parts, and manufacturing procedure is greatly reduced, shorten the process-cycle.It is currently used in SLM metal powder material
There are titanium alloy, aluminium alloy, stainless steel, mould steel, nickel-base alloy etc..
Vacuum induction melting (Vacuum induction melting, abbreviation VIM) is that one kind utilizes under vacuum
Electromagnetic inductive heating principle carrys out the smithcraft processing procedure of smelting metal.Vortex flow can be produced during electromagnetic induction, makes metal
Fusing.This processing procedure can be used to improve the purity of alloy, the low-alloyed oxygen content of drop.
Vacuum outgas (Vacuum degassing) refers to metal dust being placed in vacuum environment, at a certain temperature,
The method for discharging the gas on powder gap or surface.Fruit storage can improve the mobility of powder, and this is
Because powder particle particle diameter is smaller, surface energy is bigger, also easier adsorbed gas, and the gas of absorption can be further exacerbated by powder
Adhesion, reunite.Therefore, if to improve the mobility of 3D printing metal dust, Fruit storage be it is a kind of it is effective after
Treatment technology.
Inconel718 alloys are the nickel-base high-temperature conjunctions of the γ with body-centered tetragonal " and face-centred cubic γ ' phases precipitation strength
Gold, has good combination property in -253~700 DEG C of temperature ranges, and less than 650 DEG C of yield strength occupies deformation high temperature and closed
The first place of gold, and with well antifatigue, radioresistance, anti-oxidant, decay resistance, and good processing characteristics, welding
Performance and chronic tissue stability, variously-shaped complicated parts can be manufactured, in aerospace, nuclear energy, petroleum industry, upper
State and extremely wide application is obtained in temperature range.Using the Inconel718 alloys of the traditional handicraft manufacture such as casting and forging
Part, the shortcomings that macro-components segregation is low with stock utilization is respectively present, and uses 3D printing technique, can effectively overcome above-mentioned
Shortcoming.Inconel718 alloy powders for 3D printing technique have the powder required for being different from prior powder metallurgy special
Property, do not require nothing more than that powder purity is high, oxygen content is low, also require that powder sphericity is high, even particle size distribution, and good flowing
Property and apparent density.
The mainly gas atomization and plasma rotating electrode process etc. of alloy powder at present.The general principle of gas atomization is
Flow of liquid metal is broken into droplet and quickly solidified with high velocity air and forms powder；The main original of plasma rotating electrode process
Reason is will to make alloy bar that local melting occur using plasma arc, while alloy electrode rotates in inert gas high speed,
Molten metal forms alloy powder under centrifugal action.Both compare, and the obtained powder size of atomization is thinner, but traditional mist
Chemical industry skill easily causes powder and is mingled with content height, satellite ball, hollow spherical powder；Powder prepared by plasma rotating electrode process is spherical
Degree is high, high purity, but powder size is thicker, is not suitable for 3D printing technique, therefore, comprehensive using novel atomized technology
A series of powder-processed techniques, there is provided it is a kind of prepare 3D printing alloy powder method it is most important.
The content of the invention
Beaten it is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of for 3D
The preparation method of the Inconel718 alloy powders of print technology.
The present invention matches with ultrasonic vibration, air current classifying method to varigrained powder, passes through vacuum outgas
Technology improves the mobility of powder, and the Inconel718 alloy powders finally prepared have composition uniform, and impurity content is low, spherical
The performance characteristics such as height, even particle size distribution are spent, can be good at being applied to selective laser smelting technology.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of preparation method of Inconel718 alloy powders for 3D printing technique, comprises the following steps：
(1) alloy melting：Vacuum induction melting is carried out to Inconel718 alloy raw materials, obtains alloy melt；
(2) powder by atomization：Alloy melt is poured into middle bottom pour ladle, opens material leakage valve, alloy melt is through middle bottom pour ladle bottom
Small opening freely flow downwardly into gas atomization stove, under the percussion of spiral vortex type high velocity air, alloy melt is ground into fine
Drop, Inconel718 alloy powders are obtained after cooling, solidification, powder drops to atomization tower bottom, brings rotation into by gas afterwards
Flow the powder collection device under device；
(3) powder sieving：Inconel718 alloy powders made from step (2) are subjected to ultrasonic vibration screening, make 53 μm
Above powder accounting is no more than 5%；Then the powder obtained to vibrosieve carries out air current classifying；
(4) vacuum outgas：The Inconel718 alloy powders matched dress boat is placed in vacuum degassing furnace, under vacuum state
Insulation, is finally made the Inconel718 alloy powders for 3D printing technique.
In a more excellent embodiment of the invention, in step (1), carry out controlling vaccum sensitive stove during vacuum induction melting
Interior vacuum is ＜ 1 × 10-2Pa.3D printing alloy powder has strict requirements to oxygen content, and high vacuum advantageously reduces
The oxygen content of powder.
In a more excellent embodiment of the invention, in step (1), treat that Inconel718 alloy raw materials are completely melt to obtain
After alloy melt, continue to heat, molten steel temperature is reached 1550~1600 DEG C, and be incubated 15~20min.
In step (1), Inconel718 alloy raw materials composition meets following requirement by percentage to the quality：Cr：17.0%
~21.0%, Ni：50.0%~55.0%, Mo：2.80%~3.30%, Al：0.30%~0.70%, Ti：0.75%~
1.15%, Nb：4.75%~5.50%, C≤0.08%, Co≤1.0%, Si≤0.35%, Mn≤0.35%, P≤
0.015%, S≤0.015%, Mg≤0.01%, B≤0.006%, Cu≤0.3%.
In a more excellent embodiment of the invention, in step (2), temperature control is 1100~1200 in middle bottom pour ladle
℃.Bottom pour ladle temperature has large effect for atomization process, and when bottom pour ladle temperature is too low, molten steel radiating rate is too fast, Yi
Condensed in bottom pour ladle, and easily cause blocking of leting slip a remark；Therefore under the permission of appointed condition, the temperature of middle bottom pour ladle should be improved as far as possible
Degree.
In a more excellent embodiment of the invention, in step (2), spiral vortex type high velocity air is to enter gas blowout by two inlets
What disk provided, inert gas is high-purity argon gas or high pure nitrogen, and the atomizing pressure in gas atomization stove is 4.0~5.5MPa.It is logical
The atomization spray disk often used is that single air admission type sprays disk, and the application can effectively improve aerosolization using two inlets air admission type spray disk
Stability, the appearance of Metal Flake thing is avoided, stable atomization production, improves production efficiency.
In a more excellent embodiment of the invention, in step (3), the sieve mesh number of ultrasonic vibration screening is 325 mesh.Through
A large amount of sieve tests find that 270 eye mesh screens corresponding to 53 μm can not effectively remove more than 53 μm of powder, and pass through air current classifying
After removing less than 15 μm powder, the accounting of more than 53 μm powder can further increase, and can not meet selective laser smelting technology
Requirement, and 325 eye mesh screens then can effectively control the accounting of more than 53 μm powder.
In a more excellent embodiment of the invention, in step (3), the grain size proportion of air current classifying is：According to particle diameter 3~
15 μm of powder accounting 0~5%, the powder accounting 85%~95% of 15~53 μm of particle diameter, the powder accounting of 53~100 μm of particle diameter
5%~10% mass ratio relation is matched.
Inconel718 Co-based alloy powders for selective laser smelting technology prepared by prior art, only powder is entered
The simple screening of row, SLM formers are directly used in after obtaining the suitable powder of particle size range.The application is sent out by experimental study
It is existing：The powder of same particle size range, different grain size proportioning, its laser fusion formability differ greatly.The present invention is prepared Ni-based
Superalloy powder, its average grain diameter are less than powdering accumulation horizon thickness, and the powder of different grain size rank is carried out accurately by weight
Match, ensure the powder bed of formation high-compactness after powdering, during the fusing shaping of selective laser, do not occur " to splash " now
As forming part deformation is small, precision is high, and performance can meet requirement.It is of the invention according to the characteristics of powder sieving technique
Preparation method innovatively applying vibration screening+air current classifying method, not only increases powder sieving efficiency, moreover it is possible to ensures higher
Screening effect.
In a more excellent embodiment of the invention, in step (4), per boat, dress powder is highly less than 15mm.
In a more excellent embodiment of the invention, in step (4), Inconel718 alloy powders are 1.3 × 10﹣ 2Pa is true
Under sky, 2~5h is incubated respectively at 300~500 DEG C and 600~800 DEG C successively.
Using Inconel718 alloy powders made from preparation method of the present invention, be particularly suitable for use in selective laser fusing skill
Art.
The method that conventional metal dust improves, improved its mobility is addition dispersant, makes rubbing between powder particle
Wipe and reduce, so as to play the effect for improving powder flowbility.But the Inconel718 alloy powders for 3D printing require powder
The impurity content at end can undoubtedly mix more impurity elements in very low level, addition dispersant, and 3D printing shaping is caused
Adverse effect.The method that powder particle sphericity is improved in powder atomization production is to increase the size of atomization cylinder, improves alloy
The degree of superheat of drop, but the size of atomization cylinder and the degree of superheat of alloy are improved, production technology can be caused unstable, be produced into
This increase, it is unfavorable for the popularization and application of 3D printing technique.
The present invention is directed to selective laser smelting technology feature, with reference to different powder technologies of preparing, preparation
Inconel718 Co-based alloy powders high purity, impurity and oxygen content are low, particle sphericity is high, particle diameter distribution is uniform, different
The other powder mixture ratio relation of grain-size grade is appropriate, has good mobility and higher apparent density, meets that selective laser is melted
Particular/special requirement of the technology for powder property.
In addition, by many experiments, it is found that Fruit storage can improve the mobility of powder.Because powder
Grain particle diameter is smaller, and surface energy is bigger, also easier adsorbed gas, and the gas of absorption can be further exacerbated by the adhesion of powder, group
It is poly-.Powder particle particle diameter is smaller in the Inconel718 alloy powders that the application is prepared according to optimum grain-diameter ratio range, to powder
Mobility and 3D printing the formability tool at end have a certain impact.Therefore, if to improve the flowing of 3D printing metal dust
Property, Fruit storage is a kind of effective post-processing technology.
In summary, compared with prior art, the present invention has advantages below and beneficial effect：
1st, the Inconel718 alloy powder impurity contents that prepared by the present invention are low, and particle diameter distribution is uniform, and powder particle is spherical
Degree is high, and average spherical degree >=0.80, powder flowbility is good (≤18s/50g), apparent density height (>=4.0g/cm3), beaten by 3D
Obtained drip molding even tissue, densification are printed, dimensional accuracy is high, good mechanical performance.
2nd, the present invention is directed to requirement of the different metal 3D printing technique to powder diameter, passes through the side such as screening, air current classifying
Method, prepare the Inconel718 alloy powders suitable for a variety of 3D printing techniques；Vacuum degassing technology is used simultaneously, is effectively carried
The high mobility of Inconel718 alloy powders.
Brief description of the drawings
Fig. 1 is Inconel718 alloy powder particles shape appearance figure made from embodiment 1；
Fig. 2 is Inconel718 alloy powder particles shape appearance figure made from embodiment 2；
Fig. 3 is Inconel718 alloy powder particles shape appearance figure made from embodiment 3.
Embodiment
A kind of preparation method of Inconel718 alloy powders for 3D printing technique, comprises the following steps：
(1) alloy melting：Vacuum induction melting is carried out to Inconel718 alloy raw materials, obtains alloy melt；
(2) powder by atomization：Alloy melt is poured into middle bottom pour ladle, opens material leakage valve, alloy melt is through middle bottom pour ladle bottom
Small opening freely flow downwardly into gas atomization stove, under the percussion of spiral vortex type high velocity air, alloy melt is ground into fine
Drop, Inconel718 alloy powders are obtained after cooling, solidification, powder drops to atomization tower bottom, brings rotation into by gas afterwards
Flow the powder collection device under device；
(3) powder sieving：Inconel718 alloy powders made from step (2) are subjected to ultrasonic vibration screening, make 53 μm
Above powder accounting is no more than 5%；Then the powder obtained to vibrosieve carries out air current classifying；
(4) vacuum outgas：The Inconel718 alloy powders matched dress boat is placed in vacuum degassing furnace, under vacuum state
Insulation, is finally made the Inconel718 alloy powders for 3D printing technique.
In step (1), it is ＜ 1 × 10 to carry out controlling vacuum in vaccum sensitive stove during vacuum induction melting-2Pa, treat
Inconel718 alloy raw materials are completely melt after obtaining alloy melt, continue to heat, and molten steel temperature is reached 1550~1600 DEG C,
And it is incubated 15~20min.
In step (1), Inconel718 alloy raw materials composition meets following requirement by percentage to the quality：Cr：17.0%
~21.0%, Ni：50.0%~55.0%, Mo：2.80%~3.30%, Al：0.30%~0.70%, Ti：0.75%~
1.15%, Nb：4.75%~5.50%, C≤0.08%, Co≤1.0%, Si≤0.35%, Mn≤0.35%, P≤
0.015%, S≤0.015%, Mg≤0.01%, B≤0.006%, Cu≤0.3%.
In step (2), for temperature control at 1100~1200 DEG C, spiral vortex type high velocity air is to pass through two inlets in middle bottom pour ladle
The offer of gas blowout disk is provided, inert gas be high-purity argon gas or high pure nitrogen, the atomizing pressure in gas atomization stove is 4.0~
5.5MPa。
In step (3), the sieve mesh number of ultrasonic vibration screening is 325 mesh, in step (3), the grain size proportion of air current classifying
For：According to 3~15 μm of powder accounting 0~5% of particle diameter, the powder accounting 85%~95% of 15~53 μm of particle diameter, particle diameter 53~
The mass ratio relation of 100 μm of powder accounting 5%~10% is matched.
In step (4), per boat, dress powder is highly less than 15mm, and Inconel718 alloy powders are 1.3 × 10﹣ 2Under Pa vacuum,
2~5h is incubated respectively at 300~500 DEG C and 600~800 DEG C successively.
With reference to specific embodiment, the present invention is described in detail.
Embodiment 1：
The Inconel718 alloy powders for SLM technologies are prepared using following steps：
(1) alloy remelting：50kg Inconel718 alloy raw materials are added into vacuum induction melting, alloying component is
Cr：18.5%, Ni：52.4%, Mo：2.91%, Al：0.45%, Ti：0.88%, Nb：4.75%~5.50%, C≤
0.004%, Co≤0.5%, Si≤0.15%, Mn≤0.12%, P≤0.003%, S≤0.003%, Mg≤0.005%, B≤
0.0006%, Cu≤0.015%.Smelting furnace vacuum 9.6 × 10-3Pa, after raw material is completely melt, molten steel temperature is controlled 1580
DEG C, 20min is incubated, while middle bottom pour ladle is heated to 1130 DEG C；
(2) powder by atomization：Material leakage valve is opened, small opening of the alloy melt through middle bottom pour ladle bottom freely flows downwardly into gas mist
Change stove, the atomizing pressure in gas atomization stove is 4.0MPa, and under the percussion of High Purity Nitrogen air-flow, alloy melt is ground into micro-
Small droplet, Inconel718 alloy powders are obtained after cooling, solidification, powder drops to atomizing cooling tower bottom, brought into by gas
Powder collection device；
(3) powder sieving：Inconel718 alloy powders made from step (2) are subjected to ultrasonic vibration screening, its screen cloth
Mesh number is 325 mesh, takes the lower mesh of sieve, and more than 53 μm powder are accounted for as 3.2%；Then the powder obtained to vibrosieve carries out air-flow point
Level, according to 3~15 μm of powder accounting 3% of particle diameter, the powder accounting 92% of 15~53 μm of particle diameter, the powder that 53~100 μm of particle diameter
The mass ratio relation of last accounting 5% is matched.
(4) vacuum outgas：The Inconel718 alloy powders dress boat that step (3) classification obtains is placed in vacuum degassing furnace,
Per boat, dress powder is highly less than 15mm, 6 boats is put per stove, 1.3 × 10﹣ 2Under Pa vacuum, protected respectively at 300 DEG C and 600 DEG C successively
Warm 4.5h.
The Inconel718 alloy powder particles pattern that the present embodiment is prepared is as shown in figure 1, the μ of average grain diameter 39.22
M, sphericity 0.91, mobility 16.5s/50g, apparent density 4.35g/cm3, powder carries out part in EOS M290 equipment
SLM is molded, and powder flowbility is good during powdering, and formation of parts deforms small, uniform texture, and mechanical property meets part
Requirement.
Embodiment 2
The Inconel718 alloy powders for LENS technologies are prepared using following steps：
(1) alloy melting：50kg Inconel718 alloy raw materials are added into vacuum induction melting, alloying component is
Cr：20.1%, Ni：53.9%, Mo：3.12%, Al：0.55%, Ti：0.78%, Nb：4.95%, C≤0.002%, Co≤
0.15%, Si≤0.025%, Mn≤0.025%, P≤0.001%, S≤0.003%, Mg≤0.001%, B≤0.0003%,
Cu≤0.017%.Smelting furnace vacuum 9.2 × 10-3Pa, after raw material is completely melt, molten steel temperature is controlled at 1550 DEG C, insulation
20min, while middle bottom pour ladle is heated to 1150 DEG C；
(2) powder by atomization：Alloy melt is poured into middle bottom pour ladle, opens material leakage valve, alloy melt is through middle bottom pour ladle bottom
Small opening freely flow downwardly into gas atomization stove, the atomizing pressure in gas atomization stove is 5.0MPa, in rushing for High Purity Nitrogen air-flow
Hit under effect, alloy melt is ground into fine droplets, obtains Inconel718 alloy powders after cooling, solidification, powder drops to
Atomizing cooling tower bottom, powder collection device is brought into by gas；
(3) powder sieving：Inconel718 alloy powders made from step (2) are subjected to ultrasonic vibration screening, its screen cloth
Mesh number is 325 mesh, takes the lower mesh of sieve, its more than 53 μm powder accountings are 3.7%；Then promoting the circulation of qi is entered to the powder that vibrosieve obtains
Flow point level, according to 3~15 μm of powder accounting 2% of particle diameter, the powder accounting 94% of 15~53 μm of particle diameter, 53~100 μm of particle diameter
The mass ratio relation of powder accounting 4% matched.
(4) vacuum outgas：The Inconel718 alloy powders dress boat that step (3) classification obtains is placed in vacuum degassing furnace,
Per boat, dress powder is highly less than 15mm, 1.3 × 10﹣ 2Under Pa vacuum, 3.5h is incubated respectively at 400 DEG C and 700 DEG C successively.
The Inconel718 alloy powders that the present embodiment is prepared, 38.54 μm of average grain diameter, sphericity 0.93, flowing
Property 17.3s/50g, apparent density 4.71g/cm3, powder carries out part LENS shapings in EOS M290 equipment, during powdering
Powder flowbility is good, and formation of parts deforms small, uniform texture, and mechanical property meets the requirement of part.
Embodiment 3：
The Inconel718 alloy powders for EBM technologies are prepared using following steps：
(1) alloy remelting：50kg Inconel718 alloy raw materials are added into vacuum induction melting, alloying component is
Cr：18.7%, Ni：52.4%, Mo：2.85%, Al：0.66%, Ti：0.82%, Nb：4.85%, C≤0.003%, Co≤
0.12%, Si≤0.027%, Mn≤0.034%, P≤0.002%, S≤0.005%, Mg≤0.007%, B≤0.0004%,
Cu≤0.025%.Smelting furnace vacuum 9.8 × 10-3Pa, after raw material is completely melt, molten steel temperature is controlled at 1600 DEG C, insulation
20min, while middle bottom pour ladle is heated to 1180 DEG C；
(2) powder by atomization：Material leakage valve is opened, small opening of the alloy melt through middle bottom pour ladle bottom freely flows downwardly into gas mist
Change stove, the atomizing pressure in gas atomization stove is 5.5MPa, and under the percussion of High Purity Nitrogen air-flow, alloy melt is ground into micro-
Small droplet, Inconel718 alloy powders are obtained after cooling, solidification, powder drops to atomizing cooling tower bottom, brought into by gas
Powder collection device；
(3) powder sieving：Inconel718 alloy powders made from step (2) are subjected to ultrasonic vibration screening, its screen cloth
Mesh number is 325 mesh, takes the lower mesh of sieve, its more than 53 μm powder accountings are 2.4%；Then promoting the circulation of qi is entered to the powder that vibrosieve obtains
Flow point level, according to 3~15 μm of powder accounting 4% of particle diameter, the powder accounting 92% of 15~53 μm of particle diameter, 53~100 μm of particle diameter
The mass ratio relation of powder accounting 4% matched.
(4) vacuum outgas：The Inconel718 alloy powders dress boat that step (4) classification obtains is placed in vacuum degassing furnace,
Per boat, dress powder is highly less than 15mm, 1.3 × 10﹣ 2Under Pa vacuum, 2.5h is incubated respectively at 500 DEG C and 800 DEG C successively.
The Inconel718 alloy powder particles pattern that the present embodiment is prepared is as shown in figure 3, the μ of average grain diameter 36.75
M, sphericity 0.95, mobility 17.8s/50g, apparent density 4.68g/cm3, powder carries out part in EOS M290 equipment
EBM is molded, and powder flowbility is good during powdering, and formation of parts deforms small, uniform texture, and mechanical property meets part
Requirement.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using invention.
Person skilled in the art obviously can easily make various modifications to these embodiments, and described herein general
Principle is applied in other embodiment without by performing creative labour.Therefore, the invention is not restricted to above-described embodiment, ability
Field technique personnel do not depart from improvement that scope made and modification all should be the present invention's according to the announcement of the present invention
Within protection domain.
Claims (10)
1. the preparation method of a kind of Inconel718 alloy powders for 3D printing technique, it is characterised in that including following step
Suddenly：
(1) alloy melting：Vacuum induction melting is carried out to Inconel718 alloy raw materials, obtains alloy melt；
(2) powder by atomization：Alloy melt is poured into middle bottom pour ladle, small opening of the alloy melt through middle bottom pour ladle bottom is freely to dirty
Enter gas atomization stove, under the percussion of spiral vortex type high velocity air, alloy melt is ground into fine droplets, after cooling, solidification
Obtain Inconel718 alloy powders；
(3) powder sieving：Inconel718 alloy powders made from step (2) are subjected to ultrasonic vibration screening, make more than 53 μm
Powder accounting is no more than 5%；Then the powder obtained to vibrosieve carries out air current classifying；
(4) vacuum outgas：The Inconel718 alloy powders matched dress boat is placed in vacuum degassing furnace, protected under vacuum state
Temperature, the Inconel718 alloy powders for 3D printing technique are finally made.
2. a kind of preparation method of Inconel718 alloy powders for 3D printing technique according to claim 1, its
It is characterised by, in step (1), it is ＜ 1 × 10 to carry out controlling vacuum in vaccum sensitive stove during vacuum induction melting-2Pa。
3. a kind of preparation method of Inconel718 alloy powders for 3D printing technique according to claim 1, its
It is characterised by, in step (1), after Inconel718 alloy raw materials are completely melt to obtain alloy melt, continue to heat, make molten steel
Temperature reaches 1550~1600 DEG C, and is incubated 15~20min.
4. a kind of preparation method of Inconel718 alloy powders for 3D printing technique according to claim 1, its
It is characterised by, in step (1), Inconel718 alloy raw materials composition meets following requirement by percentage to the quality：Cr：17.0%
~21.0%, Ni：50.0%~55.0%, Mo：2.80%~3.30%, Al：0.30%~0.70%, Ti：0.75%~
1.15%, Nb：4.75%~5.50%, C≤0.08%, Co≤1.0%, Si≤0.35%, Mn≤0.35%, P≤
0.015%, S≤0.015%, Mg≤0.01%, B≤0.006%, Cu≤0.3%.
5. a kind of preparation method of Inconel718 alloy powders for 3D printing technique according to claim 1, its
It is characterised by, in step (2), temperature control is at 1100~1200 DEG C in middle bottom pour ladle.
6. a kind of preparation method of Inconel718 alloy powders for 3D printing technique according to claim 1, its
It is characterised by, in step (2), spiral vortex type high velocity air is to enter gas blowout disk by two inlets to provide, and the inert gas used is
High-purity argon gas or high pure nitrogen, the atomizing pressure in gas atomization stove is 4.0~5.5MPa.
7. a kind of preparation method of Inconel718 alloy powders for 3D printing technique according to claim 1, its
It is characterised by, in step (3), the sieve mesh number of ultrasonic vibration screening is 325 mesh.
8. a kind of preparation method of Inconel718 alloy powders for 3D printing technique according to claim 1, its
It is characterised by, in step (3), the grain size proportion of air current classifying is：According to 3~15 μm of powder accounting 0~5% of particle diameter, particle diameter
15~53 μm of powder accounting 85%~95%, the mass ratio relation of the powder accounting 5%~10% of 53~100 μm of particle diameter are entered
Row proportioning.
9. a kind of preparation method of Inconel718 alloy powders for 3D printing technique according to claim 1, its
It is characterised by, in step (4), per boat, dress powder is highly less than 15mm.
10. a kind of preparation method of Inconel718 alloy powders for 3D printing technique according to claim 1, its
It is characterised by, in step (4), Inconel718 alloy powders are 1.3 × 10﹣ 2Under Pa vacuum, successively at 300~500 DEG C and 600
2~5h is incubated respectively at~800 DEG C.
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