CN106065450B - A kind of high-entropy alloy powder and its method that cladding layer is prepared using laser - Google Patents
A kind of high-entropy alloy powder and its method that cladding layer is prepared using laser Download PDFInfo
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- CN106065450B CN106065450B CN201610613355.7A CN201610613355A CN106065450B CN 106065450 B CN106065450 B CN 106065450B CN 201610613355 A CN201610613355 A CN 201610613355A CN 106065450 B CN106065450 B CN 106065450B
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- 239000000956 alloy Substances 0.000 title claims abstract description 91
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 89
- 239000000843 powder Substances 0.000 title claims abstract description 67
- 238000005253 cladding Methods 0.000 title abstract description 17
- 238000000034 method Methods 0.000 title abstract description 15
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 25
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 25
- 229910052742 iron Inorganic materials 0.000 claims abstract description 24
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 24
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 23
- 239000011159 matrix material Substances 0.000 abstract description 21
- 238000000498 ball milling Methods 0.000 abstract description 20
- 239000006104 solid solution Substances 0.000 abstract description 12
- 239000000243 solution Substances 0.000 abstract description 11
- 239000013078 crystal Substances 0.000 abstract description 8
- 238000005728 strengthening Methods 0.000 abstract description 5
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- 230000000694 effects Effects 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000013532 laser treatment Methods 0.000 abstract 1
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- 238000002203 pretreatment Methods 0.000 abstract 1
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 24
- 238000000576 coating method Methods 0.000 description 17
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- 239000011248 coating agent Substances 0.000 description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 238000004372 laser cladding Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 238000007605 air drying Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 238000002844 melting Methods 0.000 description 8
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- 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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- Mechanical Engineering (AREA)
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- Powder Metallurgy (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention discloses a kind of high-entropy alloy powder（That is CrFeNiTiMo）, it is made up of Cr, Fe, Ni, Ti, Mo element powders, while the method that the high-entropy alloy powder prepares cladding layer using laser is additionally provided, including ball milling step is carried out to the high-entropy alloy powder；Pre-treatment step is carried out to matrix；Prepare initialization layer；The preparation of cladding layer is finally carried out using laser, is protected in whole mechanical milling process and laser treatment process with Ar.Cladding layer hardness prepared by the high-entropy alloy powder in the present invention significantly improves, reach Vickers hardness 800HV, Mo in alloying element is very effective solution strengthening element, can crystal grain thinning, the presence of Mo elements effectively increases the solute atoms quantity of solid solution, there is reciprocation in solute atoms and dislocation, add dislocation motion resistance, improve alloy strength；Thick atom radius Ti elements are also easy to produce distortion of lattice, produce substantial amounts of solid solution, solution strengthening effect is obvious.
Description
Technical field
The present invention relates to high-entropy alloy and its cladding layer preparation method field, is by Cr, Fe, Ni, Ti, Mo specifically
The preparation method of element powders composition high-entropy alloy powder and its laser cladding layer in five.
Background technology
Traditional alloy using one or two kinds of (such as Fe, Al, Mg, Ni, Co, Cu) metals as major components, alloy
Structure and performance depend primarily on major components.With the continuous progress of science and technology, the requirement more and more higher to material is existing
Alloy can not meet to be actually needed.
A kind of new alloy material that high-entropy alloy exactly develops under this background, high-entropy alloy are also known as high chaotic
Alloy is spent, is the alloy design pattern that breaks traditions that taken the lead in by China's Taiwan's scholars in the 1990s, the new alloy of proposition is set
Meter theory, because its entropy is high compared with conventional alloys, therefore claim high-entropy alloy.It is with the difference of conventional alloys：High-entropy alloy refers to
Alloy containing a variety of essential elements, wherein each essential element has high molar fraction, but no more than 35%, this alloy
It is to be embodied by multiple element collective and show its characteristic, such microstructure of the alloy is simple in construction, or even amorphous phase and nanometer occurs
Phase, alloy have excellent combination property, so as to as a new research in material science and Condensed Matter Physics field
Focus.
Existing common high-entropy alloy has the luxuriant face-centered cubic solid solution using CoCrCuFeNi as representative for waiting discovery of leaf
The alloy of structure；The brave alloy using AlCoCrFeNi as the body center cubic solid solution structure of representative for waiting discovery is opened, but with height
The continuous development of entropy alloy material and constantly experiment, now need that hardness is more preferable, corrosion resistance is strong, yield strength and fracture are strong
Du Genggao high-entropy alloy.
The content of the invention
It is an object of the invention to provide a kind of high-entropy alloy powder, for improving existing metal material by laser melting coating means
Wearability, hardness and the intensity index of material；The present invention also provides a kind of high-entropy alloy powder and prepares cladding layer using laser simultaneously
Method, for being surface-treated to current material, high rigidity, the metal material of alkali resistance corrosive nature are obtained, to meet such as
What turbine, bearing etc. worked in certain circumstances, the part high to material hardness, intensity requirement manufactures.
The present invention is achieved through the following technical solutions：
A kind of high-entropy alloy powder, i.e. CrFeNiTiMo, be made up of Cr, Fe, Ni, Ti, Mo element powders, each element powder grain
Degree scope is 200-300 mesh, and the purity of each element powder is all higher than being equal to 99.9%, described Cr, Fe, Ni, Ti, Mo mol ratio
For (1~1.05)：(1~1.05)：(1~1.05)：(0.1~1.5)：(0.1~1.5).
A kind of high-entropy alloy powder, is made up of Cr, Fe, Ni, Ti, Mo element powders, and each element powder size scope is 200-
300 mesh, the purity of each element powder are all higher than being equal to 99.9%, and described Cr, Fe, Ni, Ti, Mo mol ratio are 1:1:1:1：1.
A kind of method that high-entropy alloy powder prepares cladding layer using laser, is comprised the steps of：
The high-entropy alloy powder is put into ball mill by step 3.1, and vacuum drawn is carried out to ball mill using evacuator,
After vacuum reaches below 5000Pa, injection Ar gas carries out ball milling, and it is 6-8 hours to continue Ball-milling Time；
Step 3.2 is pre-processed matrix, and specific processing step is followed successively by cleaning, drying, polishes, refines and check slightly
Rugosity, as roughness Ra ＜ 1.6, surface clean is carried out with acetone, air-dry 10-15 minutes, cleaned again with acetone, natural wind
Dry more than 60 minutes stand-by；
The ethanol that the high-entropy alloy powder that step 3.3 completes ball milling in step 3.1 is 90-95% with purity is soaked simultaneously
Stirring, evenly laid out on matrix surface, tiling thickness is that 0.8-1.2mm forms initialization layer, and it is stand-by to carry out natural air drying；It is preferred that
Ground, the initialization layer are 0.8-0.9mm, more preferably 0.8mm.
The initialization layer dried in step 3.3 is carried out Laser Cladding Treatment by step 3.4 using laser, the laser
Hot spot is adjusted to circular light spot, spot diameter D=3.5-4.5mm, power P=2.2-2.6KW, sweep speed v=4-5mm/s, melts
The whole process covered uses Ar gas shieldeds.
Preferably, the initial speed of ball mill described in the step 3.1 is 200 revs/min, and Ball-milling Time often reaches 1 hour
Corresponding rotating speed increases by 50 revs/min, not more than 500 revs/min.
Preferably, step 3.3 described matrix is any one in 40Cr steel, 42CrMo, 45 steel.
Preferably, laser described in the step 3.4 is high power CO2Laser.
The present invention compared with prior art, has advantages below and beneficial effect：
(1) the cladding layer hardness prepared by the high-entropy alloy powder in the present invention significantly improves, and reaches Vickers hardness
800HV, meanwhile, the Mo in the present invention in alloying element is very effective solution strengthening element, can crystal grain thinning, Mo elements
In the presence of the solute atoms quantity for effectively increasing solid solution, there is reciprocation, add dislocation motion in solute atoms and dislocation
Resistance, improve alloy strength；Thick atom radius Ti elements are also easy to produce distortion of lattice, produce substantial amounts of solid solution, solution strengthening
Effect is obvious.
(2) corrosion resistance of high-entropy alloy cladding layer is significantly improved in the present invention, thick atom radius Mo members in the present invention
Element and Ti elements cause distortion of lattice to aggravate, and cause grain boundaries to have higher energy, turn into perishable position.Ti element sheets
Body has excellent corrosion resistant alloy corrosion resistance coating good.Ti elements can form the oxidation of densification in 1mol/L NaOH solutions
Film, internal alloy coat is played a good protection.
Brief description of the drawings
Fig. 1 is the tempering hardness curve map of the embodiment of the present invention 4；
Fig. 2 is hardness profiles of the 1-6 of the embodiment of the present invention at 880 degrees Celsius；
Fig. 3 corrosion current curve maps in 1mol/L NaOH solutions for the present invention；
Fig. 4 corrosion potential curve maps in 1mol/L NaOH solutions for the present invention；
Fig. 5 is the cladding layer thickness of the embodiment of the present invention 4 and the graph of relation of hardness；
Fig. 6 is the high-entropy alloy XRD spectrum of the embodiment of the present invention 4 and embodiment 5；
Fig. 7 is high-entropy alloy CrFeNiTiMo microscopic structures in the present invention；
Fig. 8 is Cr elemental maps in CrFeNiTiMo high-entropy alloys；
Fig. 9 is Fe elemental maps in CrFeNiTiMo high-entropy alloys；
Figure 10 is Ni elemental maps in CrFeNiTiMo high-entropy alloys；
Figure 11 is Ti elemental maps in CrFeNiTiMo high-entropy alloys；
Figure 12 is Mo elemental maps in CrFeNiTiMo high-entropy alloys.
Embodiment
The present invention is described in further detail with reference to embodiment, but the implementation of the present invention is not limited to this.
With reference to shown in accompanying drawing 1-12, carried out by matrix material of 40Cr steel, it is as follows to be related to explanation of nouns in embodiment：
Atomic ratio：The number ratio of Elements Atom in compound.
Mol ratio：" amount of material " be to represent the number of material, but it is counted with number, if material is point
It just refers to the number of molecule to son, if material is the number that atom refers to atom if it, but a molecule or an atom pair
We do not use at all, relatively abstract, also nonsensical in actual applications, have then just used a bigger number, Ah
Fu Jiadeluo constants (mole constant)：Six points 02 are multiplied by ten 20 cube.1 mole of something just has so more numbers
Atom or molecule.The quality of 1 mole of something is just just so much gram of its molecular weight.If 1 mole of S is 32g, 1 mole of N2
It is 28g.
Molar fraction：A kind of amount of the material of material in mixture or solution and the amount sum of the material of each component it
Than, be the component molar fraction.
Entropy：The degree of " out of order " in one system, also characterize a kind of measurement of vital movement procedure quality.
Constituent element:Independent, the most basic unit of component alloy is referred to as constituent element, constituent element can be component alloy element or
Stable compound.
Embodiment 1：
A kind of high-entropy alloy powder, is made up of Cr, Fe, Ni, Ti, Mo element powders, and each element powder size scope is 200-
300 mesh, the purity of each element powder are all higher than being equal to 99.9%, and described Cr, Fe, Ni, Ti, Mo mol ratio are 1:1:1:0.2：
0.2。
Embodiment 2：
A kind of high-entropy alloy powder, is made up of Cr, Fe, Ni, Ti, Mo element powders, and each element powder size scope is 200-
300 mesh, the purity of each element powder are all higher than being equal to 99.9%, and described Cr, Fe, Ni, Ti, Mo mol ratio are 1:1:1:0.5：
0.5。
Embodiment 3：
A kind of high-entropy alloy powder, is made up of Cr, Fe, Ni, Ti, Mo element powders, and each element powder size scope is 200-
300 mesh, the purity of each element powder are all higher than being equal to 99.9%, and described Cr, Fe, Ni, Ti, Mo mol ratio are 1:1:1:
0.75：0.75.
Embodiment 4：
A kind of high-entropy alloy powder, is made up of Cr, Fe, Ni, Ti, Mo element powders, and each element powder size scope is 200-
300 mesh, the purity of each element powder are all higher than being equal to 99.9%, and described Cr, Fe, Ni, Ti, Mo mol ratio are 1:1:1:1：1.
Embodiment 5：
A kind of high-entropy alloy powder, is made up of Cr, Fe, Ni, Ti, Mo element powders, and each element powder size scope is 200-
300 mesh, the purity of each element powder are all higher than being equal to 99.9%, and described Cr, Fe, Ni, Ti, Mo mol ratio are 1:1:1:
1.25：1.25.
Embodiment 6：
A kind of high-entropy alloy powder, is made up of Cr, Fe, Ni, Ti, Mo element powders, and each element powder size scope is 200-
300 mesh, the purity of each element powder are all higher than being equal to 99.9%, and described Cr, Fe, Ni, Ti, Mo mol ratio are 1:1:1:1.5：
1.5。
Embodiment 7：
High-entropy alloy powder described in embodiment 1-6 is subjected to laser melting coating experiment as steps described below respectively：
The high-entropy alloy powder is put into ball mill by step 1., and vacuum drawn is carried out to ball mill using evacuator,
After vacuum reaches below 5000Pa, injection Ar gas carries out ball milling, and it is 6-8 hours to continue Ball-milling Time；
Step 2. is pre-processed matrix, and specific processing step is followed successively by cleaning, drying, polishes, refines and check slightly
Rugosity, when roughness Ra=0.3, surface clean is carried out with acetone, air-dry 10-15 minutes, cleaned again with acetone, natural wind
Dry more than 60 minutes stand-by；
The ethanol that the high-entropy alloy powder that step 3. completes ball milling in step 1 is 90-95% with purity is soaked and stirred
Mix, evenly laid out on matrix surface, tiling thickness is that 0.8mm forms initialization layer, and it is stand-by to carry out natural air drying；
The initialization layer dried in step 3 is carried out Laser Cladding Treatment, the light of the laser by step 4. using laser
Spot is adjusted to circular light spot, spot diameter D=3.5mm, power P=2.5KW, sweep speed v=5mm/s, the whole process of cladding
Using Ar gas shieldeds.
Embodiment 8：
High-entropy alloy powder described in embodiment 4 is subjected to laser melting coating experiment as steps described below respectively：
The high-entropy alloy powder is put into ball mill by step 1., and vacuum drawn is carried out to ball mill using evacuator,
After vacuum reaches below 5000Pa, injection Ar gas carries out ball milling, and it is 6-8 hours to continue Ball-milling Time；
Step 2. is pre-processed matrix, and specific processing step is followed successively by cleaning, drying, polishes, refines and check slightly
Rugosity, when roughness Ra=1, surface clean is carried out with acetone, air-dry 10-15 minutes, cleaned again with acetone, natural air drying
More than 60 minutes stand-by；
The ethanol that the high-entropy alloy powder that step 3. completes ball milling in step 1 is 90-95% with purity is soaked and stirred
Mix, evenly laid out on matrix surface, tiling thickness is that 0.8mm forms initialization layer, and it is stand-by to carry out natural air drying；
The initialization layer dried in step 3 is carried out Laser Cladding Treatment, the light of the laser by step 4. using laser
Spot is adjusted to circular light spot, spot diameter D=3.5mm, power P=2.5KW, sweep speed v=5mm/s, the whole process of cladding
Using Ar gas shieldeds.
Embodiment 9：
High-entropy alloy powder described in embodiment 4 is subjected to laser melting coating experiment as steps described below respectively：
The high-entropy alloy powder is put into ball mill by step 1., and vacuum drawn is carried out to ball mill using evacuator,
After vacuum reaches below 5000Pa, injection Ar gas carries out ball milling, and it is 6-8 hours to continue Ball-milling Time；
Step 2. is pre-processed matrix, and specific processing step is followed successively by cleaning, drying, polishes, refines and check slightly
Rugosity, when roughness Ra=1.6, surface clean is carried out with acetone, air-dry 10-15 minutes, cleaned again with acetone, natural wind
Dry more than 60 minutes stand-by；
The ethanol that the high-entropy alloy powder that step 3. completes ball milling in step 1 is 90-95% with purity is soaked and stirred
Mix, evenly laid out on matrix surface, tiling thickness is that 0.9mm forms initialization layer, and it is stand-by to carry out natural air drying；
The initialization layer dried in step 3 is carried out Laser Cladding Treatment, the light of the laser by step 4. using laser
Spot is adjusted to circular light spot, spot diameter D=3.5mm, power P=2.5KW, sweep speed v=5mm/s, the whole process of cladding
Using Ar gas shieldeds.
Embodiment 10：
High-entropy alloy powder described in embodiment 4 is subjected to laser melting coating experiment as steps described below respectively：
The high-entropy alloy powder is put into ball mill by step 1., and vacuum drawn is carried out to ball mill using evacuator,
After vacuum reaches below 5000Pa, injection Ar gas carries out ball milling, and it is 6-8 hours to continue Ball-milling Time；
Step 2. is pre-processed matrix, and specific processing step is followed successively by cleaning, drying, polishes, refines and check slightly
Rugosity, when roughness Ra=3, surface clean is carried out with acetone, air-dry 10-15 minutes, cleaned again with acetone, natural air drying
More than 60 minutes stand-by；
The ethanol that the high-entropy alloy powder that step 3. completes ball milling in step 1 is 90-95% with purity is soaked and stirred
Mix, evenly laid out on matrix surface, tiling thickness is that 1.2mm forms initialization layer, and it is stand-by to carry out natural air drying；
The initialization layer dried in step 3 is carried out Laser Cladding Treatment, the light of the laser by step 4. using laser
Spot is adjusted to circular light spot, spot diameter D=3.5mm, power P=2.5KW, sweep speed v=5mm/s, the whole process of cladding
Using Ar gas shieldeds.
Embodiment 11：
High-entropy alloy powder described in embodiment 4 is subjected to laser melting coating experiment as steps described below respectively：
The high-entropy alloy powder is put into ball mill by step 1., and vacuum drawn is carried out to ball mill using evacuator,
After vacuum reaches below 5000Pa, injection Ar gas carries out ball milling, and it is 6-8 hours to continue Ball-milling Time；
Step 2. is pre-processed matrix, and specific processing step is followed successively by cleaning, dried without polishing, surface quality
Do not handle, directly carry out surface clean with acetone, air-dry 10-15 minutes, cleaned again with acetone, natural air drying more than 60 minutes
It is stand-by；
The ethanol that the high-entropy alloy powder that step 3. completes ball milling in step 1 is 90-95% with purity is soaked and stirred
Mix, evenly laid out on matrix surface, tiling thickness is that 2.5mm forms initialization layer, and it is stand-by to carry out natural air drying；
The initialization layer dried in step 3 is carried out Laser Cladding Treatment, the light of the laser by step 4. using laser
Spot is adjusted to circular light spot, spot diameter D=3.5mm, power P=2.5KW, sweep speed v=5mm/s, the whole process of cladding
Using Ar gas shieldeds.
It can show that Cr, Fe, Ni, Ti, Mo mol ratio change are as shown in table 1 from embodiment 1- embodiments 6：
Table 1
Each element atomic radius is as shown in table 2：
| Element | Cr | Fe | Ni | Ti | Mo |
| Atomic radius | 1.85 | 1.72 | 1.62 | 2.00 | 2.01 |
| Electronegativity | 1.66 | 1.83 | 1.91 | 1.54 | 2.16 |
Table 2
As shown in Figure 1 for the embodiment of the present invention 4 temperature and corresponding hardness curved line relation, embodiment 1,2,3,5,
6 is approximate with the curve tendency of embodiment 4, and maximum hardness is between 850 ° -900 °, and maximum hardness value is less than embodiment 4
In maximum hardness value.
As shown in Fig. 2 in embodiment 1-6 in the case of equal 880 ° of temperature, using the element mole of embodiment 4
It is more maximum than the maximum hardness value of acquisition.What deserves to be explained is：Mo in the present invention in alloying element is that very effective solid solution is strong
Change element, can crystal grain thinning, and there is heat resistance, it is of the invention in Mo elements molar fraction depositing in 20% or so, Mo elements
The solute atoms quantity of solid solution is being effectively increased, solute atoms and dislocation have reciprocation, add dislocation motion resistance
Power, improve alloy strength；Thick atom radius Ti elements are also easy to produce distortion of lattice, produce substantial amounts of solid solution, and solution strengthening is made
With obvious, these all serve important function to alloy coat hardness.
As shown in fig. 6, the intensity that the mol ratio in embodiment 1-6 under equal x-ray bombardment angle in embodiment 4 obtains
It is substantially better than positioned at the embodiment 5 taken second place.Through demarcation, the alloy is mainly stood by a kind of body-centered cubic structure BCC and a kind of center of area
Square structure FCC is formed；XRD analysis show that the number of phases formed in laser cladding layer far smaller than calculates gained according to Gibbs one after anothers
The number of phases, reason be five kinds of elements of Cr, Fe, Ni, Ti, Mo mix caused by high entropic effect inhibit between complicated metal
The generation of compound.
As shown in Figure 3, Figure 4, according to respectively according to the progress laser melting coating examination of step described in embodiment 7 in embodiment 1-6
Test, the high-entropy alloy of acquisition is invaded in 1mol/L NaOH solutions respectively, according to electrochemical principle, corrosion current (Icorr)
It is smaller, corrosion potential (Ecorr) higher, then corrosion resistance is better, conversely, corrosion resistance is poorer.High-entropy alloy (CrFeNiTiMo) applies
The corrosion current of layer reduces an order of magnitude compared with matrix 40Cr steel, and corrosion potential is shuffled compared with matrix 40Cr steel
0.33V.Show that the corrosion resistance of coating is remarkably reinforced.Corrosion resistance is relevant with the element species in alloy coat and content, while group
The uniformity knitted also has an impact to corrosion resistance.
With reference to shown in table 2, the atomic radius of Mo elements is maximum in 5 kinds of elements, and Ti elements take second place, and atomic radius difference is got over
Greatly, distortion of lattice is also bigger caused by so that the phenomenon offset to the left occurs in diffraction maximum.
As shown in figure 5,7- embodiments 11 in conjunction with the embodiments, are carried out using the mol ratio of the identical element in embodiment 4
Laser melting coating is tested, and its coating thickness is followed successively by 0.8mm, 0.8mm, 0.9mm, 1.2mm, 2.5mm, and coating thickness is gradually passed
Increase, it can be seen from the relation of coating thickness in Fig. 5 and hardness, after coating thickness is more than 1.2mm, its hardness is slightly higher
In the intrinsic hardness of matrix 40Cr steel, performance unobvious, there is obvious decay in hardness curve, therefore coating thickness is preferred
Within 1.2mm.
Understand in summary：
When the molar fraction of Ti and Mo elements is 20% in conclusion one, high-entropy alloy CrFeNiTiMo of the present invention
When, hardness reaches peak value, when Ti and/or Mo elements molar fraction increase or reduce its hardness and can decline, especially when rubbing
Your fraction is more obvious than less than 20% downward trend more than 20% downward trend, so Ti and Mo members in preferred scheme of the present invention
The molar fraction of element is that 20% deviation is controlled within 0.5%.
In conclusion two, heretofore described laser cladding method between the roughness of matrix 40Cr steel and cladding layer and matrix
Element solid solution body have direct relation, the surface roughness of matrix 40Cr steel is lower, and it is better that its element solid solution body is formed, using sweeping
Retouch the tissue topography of electron microscope observation high-entropy alloy, and with the micro-area composition of its subsidiary energy disperse spectroscopy beta alloy；Utilize X
X ray diffractometer x analyzes alloy thing phase composition, and condition is：Cu targets, voltage 40kV, electric current 40mA, scanning angle are 20 ° -90 °, are swept
It is 4 °/min to retouch speed.
CrFeNiTiMo high-entropy alloy coatings are mainly made up of equiax crystal, and that waits uranium crystalline substance is formed as melt inner crystalline core
Free growing result.In laser cladding process, the nucleus in molten bath centre because preferred orientation is not present in direction of heat flow, therefore
The speed that it grows to surrounding is roughly equal, so as to form equiax crystal.Fig. 7 is micro- group of CrFeNiTiMo high-entropy alloy coatings
Knit, row element Surface scan is entered to Fig. 7, as a result see Fig. 8-Figure 12.Analysis shows, CrFeNiTiMo high-entropy alloy coating compositions are equal
It is even, do not occur the situation of component segregation.
In the present invention, the addition of solid solution alloying elements Mo improves recrystallization temperature, and can reduce at a certain temperature
The speed that crystal grain is grown up, makes crystal grain refinement.Meanwhile Ti elements can in molten bath in the case of the injection of laser high-energy in the present invention
Substantial amounts of dispersoid particle is provided and promotes Heterogeneous Nucleation, so as to obtain more fine grains after solidifying.Crystal grain is thinner, and its is comprehensive
Can be better, and anti-fatigue performance is also higher.
Although the anti-look-down capability of its higher CrFeNiTiMo high-entropy alloy of conclusion three, the molar fraction of Ti elements is stronger,
After the molar fraction of Ti elements is more than 20%, the hardness of CrFeNiTiMo high-entropy alloys can reduce, it may appear that attend to one thing and lose sight of another
Situation, so, the hardness and corrosion resistance of comprehensive CrFeNiTiMo high-entropy alloys, preferably Ti content are 20%.
It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done to the present invention, it is every according to
Any simply modification, the equivalent variations made according to the technical spirit of the present invention to above example, each fall within the protection of the present invention
Within the scope of.
Claims (2)
1. a kind of high-entropy alloy powder, it is characterised in that be made up of Cr, Fe, Ni, Ti, Mo element powders, each element powder size model
Enclose and be all higher than being equal to 99.9% for 200-300 mesh, the purity of each element powder, described Cr, Fe, Ni, Ti, Mo mol ratio are（1
~1.05）：（1~1.05）：（1~1.05）：（0.1~1.5）：（0.1~1.5）.
2. a kind of high-entropy alloy powder according to claim 1, it is characterised in that described Cr, Fe, Ni, Ti, Mo mol ratio
For 1:1:1:1:1.
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| CN109797391B (en) * | 2017-11-17 | 2021-10-15 | 天津大学 | Low-dilution-rate FeCrCoNiMoTi high-entropy alloy powder for wind power bearing and preparation method of cladding layer of high-dilution-rate FeCrCoNiMoTi high-entropy alloy powder |
| CN109112385A (en) * | 2018-09-18 | 2019-01-01 | 湘潭大学 | CrCuNiFeTiMo high entropy alloy material and preparation method thereof |
| CN109082659B (en) * | 2018-10-26 | 2021-04-16 | 河海大学常州校区 | Preparation method of metal coating applied to corrosive environment |
| CN110331400B (en) * | 2019-08-07 | 2021-10-08 | 四川建筑职业技术学院 | Preparation of Al using axial flow laserxMethod for coating CoCrNiMnTi high-entropy alloy and coating thereof |
| CN110359040B (en) * | 2019-08-07 | 2021-10-08 | 四川建筑职业技术学院 | CoCrFexNiMnMo high-entropy alloy coating considering dilution rate and preparation method thereof |
| CN111254298B (en) * | 2020-01-15 | 2021-09-10 | 湘潭大学 | High-entropy alloy resistant to molten aluminum corrosion and preparation method thereof |
| CN111593339B (en) * | 2020-04-21 | 2022-06-24 | 上海工程技术大学 | Multilayer high-entropy alloy laser cladding layer containing nano tantalum carbide and preparation method thereof |
| TWI734605B (en) * | 2020-09-04 | 2021-07-21 | 國立中央大學 | High entropy nanomaterial and preparation method thereof |
| CN115011147B (en) * | 2021-09-22 | 2023-04-07 | 武汉苏泊尔炊具有限公司 | Composite material and preparation method thereof, non-stick cooker and manufacturing method thereof |
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| CN115216768B (en) * | 2022-09-16 | 2022-12-02 | 长沙中金智能装备有限公司 | Method for preparing composite wear-resistant coating by laser cladding and application thereof |
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