CN110331400A - Al is prepared using axis stream laserxThe method and its coating of CoCrNiMnTi high entropy alloy coating - Google Patents
Al is prepared using axis stream laserxThe method and its coating of CoCrNiMnTi high entropy alloy coating Download PDFInfo
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- CN110331400A CN110331400A CN201910724997.8A CN201910724997A CN110331400A CN 110331400 A CN110331400 A CN 110331400A CN 201910724997 A CN201910724997 A CN 201910724997A CN 110331400 A CN110331400 A CN 110331400A
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 72
- 239000000956 alloy Substances 0.000 title claims abstract description 72
- 238000000576 coating method Methods 0.000 title claims abstract description 61
- 239000011248 coating agent Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000000843 powder Substances 0.000 claims abstract description 136
- 238000005253 cladding Methods 0.000 claims abstract description 36
- 239000011159 matrix material Substances 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 19
- 150000002739 metals Chemical class 0.000 claims abstract description 18
- 238000004372 laser cladding Methods 0.000 claims abstract description 13
- 239000002270 dispersing agent Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 235000019441 ethanol Nutrition 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 13
- 238000009826 distribution Methods 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 5
- 238000005275 alloying Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 241000276489 Merlangius merlangus Species 0.000 description 1
- 229910003310 Ni-Al Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910004349 Ti-Al Inorganic materials 0.000 description 1
- 229910004692 Ti—Al Inorganic materials 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000013500 performance material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
- C23C24/106—Coating with metal alloys or metal elements only
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses prepare Al using axis stream laserxThe method of CoCrNiMnTi high entropy alloy coating, comprising the following steps: matrix is pre-processed, preset deposited metals powder is prepared；The preset deposited metals powder is soaked and stirred evenly using dispersing agent, is then laid in formation cladding initialization layer on matrix surface；Utilize axis stream CO2Laser and at least tetra- selection cladding powder thickness d, laser power P, scan velocity V and spot diameter D technological parameters carry out the orthogonal laser cladding under protection gas and handle, and obtain several groups sample；The sample that selection coating and matrix are well combined carries out the calculating of centre heat affecting depth, selects technological parameter corresponding to the smallest sample of centre heat affecting depth as optimal processing parameter；Repeat step A and B and utilizes axis stream CO2Laser and optimal processing parameter carry out the Laser Cladding Treatment under protection gas and Al are madexCoCrNiMnTi high entropy alloy coating.
Description
Technical field
The present invention relates to the technical fields of new material, more particularly, be related to a kind of high entropy alloy coating new material and its
Preparation method.
Background technique
The development of material science is constantly progressive along with the development of human society, and generates huge shadow to human society
It rings.In modern age, the development of alloy is even more to advance by leaps and bounds, and has developed the practical alloy system used more than totally 30 so far, tradition is closed
Gold with one or two kinds of metals such as iron, cobalt, nickel, copper, aluminium, magnesium etc. for major components, and by add other alloying elements use
Different processing technologys and formed, therefore the properity of alloy is limited to host element.Mid-twentieth century, Ni-Al, Ti-Al
Equal intermetallic compounds system is received significant attention due to its excellent mechanical property and resistive properties.On material preparation process,
In addition to traditional smelting process, powder metallurgic method, there are also rapid solidification method, machine-alloying etc., but the research of alloy still without departing from
A kind of frame based on element or intermetallic compound, due to this limitation, the performance of many alloys has been approached the limit, is difficult to lead to
It crosses traditional idea and obtains higher performance materials, new breakthrough mouth must be found for the design of material.
The it is proposed of high-entropy alloy is the research and development based on bulk amorphous alloys the 1990s, and people are devoted to find tool
There is the alloy of super-high glass Forming ability.It is believed that entropy is high in other words for the atom randomness height of amorphous or glass, and it is high
Entropy necessarily leads to high vitrifying Forming ability, so it has been proposed that one chaotic theoretical, but later scholar find high entropy and
High-vitrification Forming ability is not consistent, turns one's coat and single phase solid solution can be formed by finding certain high entropy of mixing alloys.Chinese platform
The researchs such as gulf scholar Ye Junwei think that this solid solution is the solid solution of the high entropy of mixing, therefore are named as high-entropy alloy.
Since high-entropy alloy tool is there are two characteristic, i.e. the high entropy of mixing of alloy system and atom is not easy to spread, thus alloy
In be commonly present solid solution phase, Nano grade structure or non crystalline structure so that alloy has high thermal stability, excellent mechanical property
Deng the alloy of different designs shows various excellent characteristics, and Comprehensive Assessment high-entropy alloy is significantly better than conventional alloys.Always
For it, high-entropy alloy is a kind of new alloy design concept, can develop the high-tech that largely can be synthesized, analyze and control
Material system, and this new alloy profile material can attract more scholars to be engaged in the research of this respect, by it is this have it is numerous excellent
The alloy of good characteristic promotes the use of various fields, can bring a new change for the application of alloy industry, bring for society new
Benefit.
It is the technology of preparing that new development in recent years is got up using laser melting and coating technique preparation high entropy alloy coating, however, with
Crossing current CO is mostly used greatly toward researcher2Laser prepares high entropy alloy coating, is primarily due to cross-flow laser and generally exports height
Rank mould (multimode), in cladding process, shared power is about 90% of general power or so within spot diameter D, and light beam exists
The distribution uniform of energy on cross section, as shown in Figure 1.Thus energy distribution form and the Temperature Distribution of material internal that generates
Also in being evenly distributed on cross section, the hardenability band cross section handled out is flat-top crescent, items in the hardenability band of this profile
Mechanical performance index distribution is also more uniform, for workpiece using advantageously.
And axis stream CO2Laser output is low-order mode (basic mode) laser beam, straight in hot spot compared with Laser Beams with Higher-Order Mode
Intensity distribution in diameter D is very different, and causes the power of low-mode laser beam and Laser Beams with Higher-Order Mode in spot diameter close
Degree distribution is very different.Low mould laser beam centre power density is much higher than beam edge power density, and high-order mode swashs
Beam center position power density is then only slightly taller than beam edge power density.Low-mode laser beam energy is unevenly distributed, light
Energy gradually goes to zero at spot edge, as shown in Figure 2.Hardenability band corresponding with this energy model cross section is crescent, firmly
Change all uniform not as good as high-order mode, the axis stream CO such as depth2Fixed its of the Energy distribution feature of laser is usually used in cutting and welding.Thus
Researcher is generally acknowledged that the axis stream CO of output low-order mode light beam2Laser is not suitable for material heat treatment.
Summary of the invention
Aiming at the problems existing in the prior art, axis stream CO is utilized the present invention provides a kind of2Laser is in low-order mode item
The method and its coating of high entropy alloy coating are prepared under part.
An aspect of of the present present invention provides a kind of utilization axis stream laser preparation AlxCoCrNiMnTi high entropy alloy coating
Method the described method comprises the following steps:
A, matrix is pre-processed, is prepared by Al powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder according to 1.5:1:1:1:
The preset deposited metals powder that the molar ratio of 1:1 mixes；
B, the preset deposited metals powder is soaked and is stirred evenly using dispersing agent, be then laid on matrix surface
Form cladding initialization layer；
C, axis stream CO is utilized2Laser and at least selection cladding powder thickness d, laser power P, scan velocity V and light
Tetra- technological parameters of spot diameter D carry out the processing of the orthogonal laser cladding under protection gas, obtain several groups sample；
D, the sample that selection coating and matrix are well combined carries out the calculating of centre heat affecting depth, selects central part
Technological parameter corresponding to the smallest sample of heat affecting depth of position is as optimal processing parameter；
E, repeat step A and B and utilize axis stream CO2Laser and the optimal processing parameter carry out under protection gas
Al is made in Laser Cladding TreatmentxCoCrNiMnTi high entropy alloy coating, wherein the preset deposited metals powder is replaced with into tune
Whole Al powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder molar ratio after the different molten metal powder prepared.
Al is prepared using axis stream laser according to the present inventionxOne implementation of the method for CoCrNiMnTi high entropy alloy coating
Example, described matrix are steel class basis material, and the pretreatment includes the surface grinding process successively carried out, cutting process, table
Face cleaning treatment and drying process.
Al is prepared using axis stream laser according to the present inventionxOne implementation of the method for CoCrNiMnTi high entropy alloy coating
Example, the deposited metals powder is by Al powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder according to 1~1.8:1~1.3:1~1.3:1
The molar ratio of~1.3:1~1.3:1~1.3 mixes, and the granularity of elemental powder is 200~300 mesh, elemental powder
Purity is all larger than or is equal to 99.9wt%.
Al is prepared using axis stream laser according to the present inventionxOne implementation of the method for CoCrNiMnTi high entropy alloy coating
Example, the dispersing agent is the ethyl alcohol that purity is 90~95wt%.
Al is prepared using axis stream laser according to the present inventionxOne implementation of the method for CoCrNiMnTi high entropy alloy coating
Example, cladding powder thickness d are 1.4~1.5mm, and spot diameter D is 3~4mm, and power P is 3000~3500W, and scan velocity V is
10~20mm/s, the protection gas are argon gas.
Al is prepared using axis stream laser according to the present inventionxOne implementation of the method for CoCrNiMnTi high entropy alloy coating
Example, the optimal processing parameter are as follows: cladding powder thickness d be 1.4mm, laser power P be 3500W, scan velocity V 5mm/s,
Spot diameter D is 4.0mm.
Al is prepared using axis stream laser according to the present inventionxOne implementation of the method for CoCrNiMnTi high entropy alloy coating
Example, the orthogonal laser cladding processing choose 3~5 level values on each technological parameter and design orthogonal test.
Al is prepared using axis stream laser according to the present inventionxOne implementation of the method for CoCrNiMnTi high entropy alloy coating
Example, the centre heat affecting depth are measured by scanning electron microscope scale, wherein in 200 times of item of amplification
Under part, measurement is since coating and matrix combined area up to the depth between heat affected area and the junctional area of matrix.
Another aspect of the present invention discloses a kind of Al prepared using axis stream laserxCoCrNiMnTi high-entropy alloy applies
Layer, which is characterized in that prepare Al using axis stream laser using above-mentionedxThe method of CoCrNiMnTi high entropy alloy coating is made.
The Al of axis stream laser preparation is utilized according to the present inventionxOne embodiment of CoCrNiMnTi high entropy alloy coating,
The AlxThe molar fraction of each element is no more than 35% in CoCrNiMnTi high entropy alloy coating, wherein x is 1~1.8.
Compared with prior art, the present invention utilizes axis stream CO2Laser under the conditions of low-order mode by adjusting machined parameters,
Cladding powdered elemental ratio prepares high entropy alloy coating, it was demonstrated that axis stream CO2Laser can also be used for preparing under certain condition
Laser cladding layer and axis stream CO is effectively expanded2The application range of laser.
Detailed description of the invention
Fig. 1 shows energy profile of the high-order mode light beam on cross section.
Fig. 2 shows energy profile of the low-order mode light beam on cross section.
Fig. 3 shows axis stream CO2The heat affected area distribution map of laser low-order mode light beam.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.
Using axis stream laser prepared by Al to the present invention belowxThe method and its coating of CoCrNiMnTi high entropy alloy coating
It is specifically described.
An exemplary embodiment of the present invention, it is described to prepare Al using axis stream laserxCoCrNiMnTi high-entropy alloy
The method of coating includes following multiple steps.
Step A:
Matrix is pre-processed, is prepared by Al powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder according to 1.5:1:1:1:1:
The preset deposited metals powder that 1 molar ratio mixes.
The matrix selected in the present invention is preferably steel class basis material, i.e. Fe sill, such as can be 35 steel, 45 steel
Equal materials.
Pretreatment may include surface grinding process, cutting process, surface cleaning processing and the drying process successively carried out.
For example, with grinding machine polishing matrix surface, followed by spark cutting at 150mm × 150mm × 12mm bulk, then with third
Ketone clean the surface simultaneously carries out dry tack free, however, the present invention is not limited thereto, as long as matrix size is suitable and can guarantee surface
Clean it is smooth, be capable of forming more excellent coating formation condition.
Preset deposited metals powder is by Al powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder rubbing according to 1.5:1:1:1:1:1
You mix ratio, wherein the granularity of elemental powder is 200~300 mesh, and the purity of elemental powder is all larger than or is equal to
99.9wt%.
Step B:
Preset deposited metals powder is soaked and stirred evenly using dispersing agent, is then laid in be formed on matrix surface and melt
Cover initialization layer.
Wherein, dispersing agent can be the ethyl alcohol that purity is 90~95wt%, be soaked using suitable dispersing agent.
Step C:
Utilize axis stream CO2Laser and at least selection cladding powder thickness d, laser power P, scan velocity V and hot spot
Tetra- technological parameters of diameter D carry out the processing of the orthogonal laser cladding under protection gas, obtain several groups sample.
Wherein, protection gas can be argon gas, using axis stream CO2When laser carries out Laser Cladding Treatment, control as circle
Hot spot and preferably control cladding powder thickness d be 1.4~1.5mm, spot diameter D be 3~4mm, power P be 3000~
3500W, scan velocity V are 10~20mm/s.Can 3~5 level values be chosen for each technological parameter within the above range
Design orthogonal test simultaneously carries out orthogonal laser cladding processing, and the reciprocation between Consideration, not orthogonal thus to obtain one group
Test result.
Step D:
The sample that selection coating and matrix are well combined carries out the calculating of centre heat affecting depth, selects centre
Technological parameter corresponding to the smallest sample of heat affecting depth is as optimal processing parameter.
Coating and matrix bonding state are well the premises that coating plays a role, and consider axis stream CO2Laser low-order mode meeting
So that the heat affecting in centre is most deep, it is specific as shown in Figure 3.The heat affecting depth in centre will affect material when too deep
Service performance, therefore premised on coating and matrix are well combined, centre heat affecting depth minimum on this basis is made
For target component.The bonding state of coating and matrix can be preferably 200 times by micro- sem observation, amplification factor.
Specifically, the heat affected area depth in centre of the present invention is carried out by scanning electron microscope (SEM) scale
Measurement, specific practice are as follows: under conditions of amplifying 200 times, measurement since coating and matrix combined area until heat affected area and
(since heat affected area is different from the tissue topography of matrix and grain size, there are one for depth between the junctional area of matrix
Junctional area)
The combination of coating and matrix be generally divided into conjunction with it is not good enough, in conjunction with bad and be well combined, those skilled in the art can
To be differentiated that the invention does not limit this using common coating combination method of discrimination.
Step E:
Repeat step A and B and utilizes axis stream CO2The optimal processing parameter that laser and step D are obtained is protected
Al is made in Laser Cladding Treatment under gasxCoCrNiMnTi high entropy alloy coating, wherein replace with preset deposited metals powder
Adjust the different molten metal powder prepared after the molar ratio of Al powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder.
After obtaining optimal processing parameter, the molar ratio that powder can be adjusted obtains different molten metal powder
End using dispersing agent wetting, is laid in matrix surface after mixing evenly, recycles axis stream CO2Laser and optimal processing parameter
Cooling can be prepared by Al after lower carry out Laser Cladding TreatmentxCoCrNiMnTi high entropy alloy coating.
Wherein, deposited metals powder is by Al powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder according to 1~1.8:1~1.3:1
~1.3:1~1.3:1~1.3:1~1.3 molar ratio mixes, and the granularity of elemental powder is 200~300 mesh, each member
The purity of plain powder is all larger than or is equal to 99.9wt%.
The Al provided by the invention prepared using axis stream laserxCoCrNiMnTi high entropy alloy coating is then examined using above-mentioned
Consider the Al of dilution ratexCoCrNiMnTi high entropy alloy coating preparation method is made.Wherein, AlxCoCrNiMnTi high entropy alloy coating
It is 1~1.8 that the molar fraction of middle each element, which is no more than 35%, x,.
The present invention will be described combined with specific embodiments below.
Al powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder are placed in mortar sufficiently with the molar ratio of 1.5:1:1:1:1:1
It is mixed to form preset deposited metals powder.
45 steel matrix are subjected to surface polishing and blocky cutting, subsequent acetone is cleaned and is dried.
Preset deposited metals powder is soaked and stirred with the ethyl alcohol that purity is 90~95wt%, it is evenly laid out in base
On body surface face, it is then laid in formation cladding initialization layer, the stand-by of natural air drying on matrix surface
Utilize axis stream CO2Laser carries out Laser Cladding Treatment, controls as circular light spot and the use of the whole process of cladding
Ar gas shielded.
Orthogonal test 4 factors of selection, A: laser power P；B: scan velocity V；C: cladding powder thickness d；D: hot spot is straight
Diameter D.Each factor takes 3 levels, and the reciprocation between Consideration, does not utilize L9(34) orthogonal arrage.Wherein, cladding powder
Thickness d is 1.4~1.5mm, and spot diameter D is 3~4mm, and power P is 3000~3500W, and scanning speed v is 10~20mm/s,
Orthogonal experiment factor and water-glass are specifically as shown in table 1.
1 orthogonal experiment factor of table and water-glass
Orthogonal experiments are as shown in table 2.
2 orthogonal experiments of table
From table 2 it can be seen that No.1 and No.8 sample cladding layer and matrix form good metallurgical bonding, more than calculating
The heat affecting depth in the centre of 2 samples, is respectively as follows: 3.4mm and 2.7mm.
It obtains accordingly and utilizes axis stream CO2Laser prepares AlxThe optimal processing parameter of CoCrNiMnTi high entropy alloy coating
Are as follows: laser power P=3500W, scan velocity V=15mm/s, cladding powder thickness d=1.4mm, spot diameter D=4.0mm.
On the basis of above embodiments, in order to inquire into influence of the laser processing parameter to coating, carry out following to having a competition
It tests.
(1) take scan velocity V=15mm/s, cladding powder thickness d=1.4mm, spot diameter D=4.0mm and laser function
Rate P is respectively 3000W, 3300W, 3500W, utilizes axis stream CO2Laser prepares Al1.5CoCrNiMnTi high entropy alloy coating (Al
Powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder are mixed according to the molar ratio of 1.5:1:1:1:1:1) laser power is to bonding state
And the influence of central hot influence depth is shown in Table 3.
When laser power is 3000W, Implantation Energy is less, and 45 steel surface of matrix is insufficient to allow to melt, thus not formed
Good combination；When power is 3300W, energy melts cladding powder, while 45 steel surface of matrix melts a small thin layer,
But compared with No.8 sample, since energy is relatively low, central hot influence depth is less than 2.7mm.
Influence of 3 power of table to bonding state and central hot influence depth
(2) laser power P=3500W, cladding powder thickness d=1.4mm, spot diameter D=4.0mm and scanning speed are taken
V is respectively 10mm/s, 15mm/s, 20mm/s, utilizes axis stream CO2Laser prepares Al1.5CoCrNiMnTi high entropy alloy coating
(Al powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder are mixed according to the molar ratio of 1.5:1:1:1:1:1), scanning speed is to combination
The influence of situation and central hot influence depth is shown in Table 4.
When scanning speed is 10mm/s, compared with No.8 sample, speed is slower, and the time of laser energy injection is long, because
And keeping the fusing of 45 steel surface of matrix more, central hot influence depth is greater than 2.7mm；When scanning speed is 20mm/s, No.8 sample
The time of condition ratio, fast speed, laser energy injection is short, and the fusing of 45 steel surface of matrix has not enough time to melt, and cladding powder is
Solidification, thus good combination cannot be formed.
Influence of 4 scanning speed of table to bonding state and central hot influence depth
(3) laser power P=3500W, scan velocity V=15mm/s, spot diameter D=4.0mm and the cladding powder thickness is taken to be respectively
1.4mm, 1.5mm, 1.6mm utilize axis stream CO2Laser prepares Al1.5CoCrNiMnTi high entropy alloy coating (Al powder, Co powder,
Cr powder, Ni powder, Mn powder and Ti powder according to 1.5:1:1:1:1:1 molar ratio mix), cladding powder thickness to bonding state and in
The influence of heart heat affecting depth is shown in Table 5.
When cladding powder thickness is 1.5mm, 1.6mm, compared with No.8 sample, powder thickness increases, molten for melting
The required laser energy in whiting end increases, thus the energy for reaching 45 steel of matrix is reduced, and surface melting tails off, and center heat affecting is deep
Degree shoals.
Influence of the 5 cladding powder thickness of table to bonding state and central hot influence depth
(4) take laser power P=3500W, scan velocity V=15mm/s, cladding powder thickness d=1.4mm and hot spot straight
Diameter is respectively 3.0mm, 3.5mm, 4.0mm, utilizes axis stream CO2Laser prepares Al1.5CoCrNiMnTi high entropy alloy coating (Al
Powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder are mixed according to the molar ratio of 1.5:1:1:1:1:1), spot diameter is to bonding state
And the influence of central hot influence depth is shown in Table 6.
When spot diameter is 3.0mm, 3.5mm, compared with No.8 sample, diameter is small, and laser energy density is big, thus makes
The fusing of 45 steel surface of matrix is more, and central hot influence depth is greater than 2.7mm.
Influence of 6 spot diameter of table to bonding state and central hot influence depth
5) axis stream CO is utilized2Laser simultaneously takes laser power P=3500W, scan velocity V=15mm/s, cladding powder thick
D=1.4mm, spot diameter D=4.0mm are spent, deposited metals powder proportions, Al are further adjustedxCoCrNiMnTi high-entropy alloy
Coating (x is molar fraction, take 1.0 respectively, 1.3,1.6,1.8), alloying component is to bonding state and central hot influence depth
It influences as shown in table 7.
Influence of 7 alloying component of table to bonding state and central hot influence depth
Al element plays the role of improving coating fluidity and mouldability in alloy powder.When x takes 1.0, cladding powder
Is there is scaling loss by high energy laser beam radiation in Al element in end, so that the mobility of cladding powder is deteriorated, with the non-shape of 45 steel of matrix
At good combination；When x takes 1.3, mobility obtains a degree of improvement, compared with No.8 sample, 45 steel surface of matrix
It melts more；When x takes 1.6,1.8, cladding powder flowbility is good, and the fusing of 45 steel surface of matrix is less, and center heat affecting is deep
Degree is less than 2.7mm.
Previous researcher mostly uses greatly crossing current CO2Laser prepares high entropy alloy coating, is primarily due to cross-flow laser
General output high-order mode, the distribution uniform of its light beam energy on cross section, every mechanical performance index in cladding process
It is distributed also more uniform.And axis stream CO2Laser output is low-mode laser beam, and low-mode laser beam energy is unevenly distributed.
Thus researcher be generally acknowledged that output low-order mode light beam axis stream CO2 laser be not suitable for material heat treatment, also without utilize axis
Flow CO2The report of laser preparation high entropy alloy coating.
The present invention utilizes axis stream CO2Laser is under the conditions of low-order mode by adjusting machined parameters, cladding powdered elemental ratio
Example prepares high entropy alloy coating, it was demonstrated that axis stream CO2Laser can also be used for preparing laser cladding layer under certain condition, expand
Axis stream CO2The application range of laser.
The invention is not limited to specific embodiments above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (10)
1. a kind of prepare Al using axis stream laserxThe method of CoCrNiMnTi high entropy alloy coating, which is characterized in that the side
Method the following steps are included:
A, matrix is pre-processed, is prepared by Al powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder according to 1.5:1:1:1:1:1
The preset deposited metals powder that mixes of molar ratio；
B, the preset deposited metals powder is soaked and is stirred evenly using dispersing agent, be then laid on matrix surface and formed
Cladding initialization layer；
C, axis stream CO is utilized2Laser and at least selection cladding powder thickness d, laser power P, scan velocity V and spot diameter
Tetra- technological parameters of D carry out the processing of the orthogonal laser cladding under protection gas, obtain several groups sample；
D, the sample that selection coating and matrix are well combined carries out the calculating of centre heat affecting depth, selects centre heat
Technological parameter corresponding to the smallest sample of influence depth is as optimal processing parameter；
E, repeat step A and B and utilize axis stream CO2Laser and the optimal processing parameter carry out the laser under protection gas
Cladding, which is handled, is made AlxCoCrNiMnTi high entropy alloy coating, wherein the preset deposited metals powder is replaced with into adjustment Al
Powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder molar ratio after the different molten metal powder prepared.
2. preparing Al using axis stream laser according to claim 1xThe method of CoCrNiMnTi high entropy alloy coating, it is special
Sign is that described matrix is steel class basis material, and the pretreatment includes the surface grinding process successively carried out, cut place
Reason, surface cleaning processing and drying process.
3. preparing Al using axis stream laser according to claim 1xThe method of CoCrNiMnTi high entropy alloy coating, it is special
Sign is, the deposited metals powder by Al powder, Co powder, Cr powder, Ni powder, Mn powder and Ti powder according to 1~1.8:1~1.3:1~
1.3:1~1.3:1~1.3:1~1.3 molar ratio mixes, and the granularity of elemental powder is 200~300 mesh, each element
The purity of powder is all larger than or is equal to 99.9wt%.
4. preparing Al using axis stream laser according to claim 1xThe method of CoCrNiMnTi high entropy alloy coating, it is special
Sign is that the dispersing agent is the ethyl alcohol that purity is 90~95wt%.
5. preparing Al using axis stream laser according to claim 1xThe method of CoCrNiMnTi high entropy alloy coating, it is special
Sign is that cladding powder thickness d is 1.4~1.5mm, and spot diameter D is 3~4mm, and power P is 3000~3500 W, scanning speed
Degree V is 10~20mm/s, and the protection gas is argon gas.
6. preparing Al using axis stream laser according to claim 1xThe method of CoCrNiMnTi high entropy alloy coating, it is special
Sign is, the optimal processing parameter are as follows: cladding powder thickness d is 1.4mm, and laser power P is 3500 W, and scan velocity V is
5mm/s, spot diameter D are 4.0mm.
7. preparing Al using axis stream laser according to claim 1xThe method of CoCrNiMnTi high entropy alloy coating, it is special
Sign is that the orthogonal laser cladding processing chooses 3~5 level values on each technological parameter and designs orthogonal test.
8. preparing Al using axis stream laser according to claim 1xThe method of CoCrNiMnTi high entropy alloy coating, it is special
Sign is that the centre heat affecting depth is measured by scanning electron microscope scale, wherein in 200 times of amplification
Under conditions of, measurement is since coating and matrix combined area up to the depth between heat affected area and the junctional area of matrix.
9. a kind of Al prepared using axis stream laserxCoCrNiMnTi high entropy alloy coating, which is characterized in that wanted using right
Al is prepared using axis stream laser described in asking any one of 1 to 9xThe method of CoCrNiMnTi high entropy alloy coating is made.
10. utilizing the Al of axis stream laser preparation according to claim 9xCoCrNiMnTi high entropy alloy coating, feature exist
In the AlxThe molar fraction of each element is no more than 35% in CoCrNiMnTi high entropy alloy coating, wherein x be 1~
1.8。
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| CN116240536A (en) * | 2022-12-29 | 2023-06-09 | 南京航空航天大学 | AlCrFeMnTi high-entropy alloy high-temperature wear-resistant coating and preparation method thereof |
| CN116288330A (en) * | 2023-02-24 | 2023-06-23 | 西北工业大学 | Repair method for local damage of nickel-based superalloy hot end component |
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