CN105506615B - A method of control laser cladding coating microstructure and fire check sensibility - Google Patents
A method of control laser cladding coating microstructure and fire check sensibility Download PDFInfo
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- CN105506615B CN105506615B CN201510926327.6A CN201510926327A CN105506615B CN 105506615 B CN105506615 B CN 105506615B CN 201510926327 A CN201510926327 A CN 201510926327A CN 105506615 B CN105506615 B CN 105506615B
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- 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
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- 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
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Abstract
The invention discloses a kind of control laser cladding coating microstructure and the methods of fire check sensibility, incident angle including changing laser in laser cladding process, to change the microstructure and the orientation of growth of cladding coating, and then change the resistance of the heat resistanceheat resistant crack initiation of cladding coating, achieve the purpose that control the formation of cladding fire check.The method of control laser cladding coating microstructure and fire check sensibility of the invention has efficiently controlled the microstructure and fire check sensibility of cladding coating by changing the incident angle of laser, this method is easy to operate, strong operability and effect is good, it is suitable for the preparation process of all kinds of laser cladding coatings, is particularly suitable for the laser melting coating of nickel base superalloy.
Description
Technical field
The present invention relates to laser cladding coating field more particularly to a kind of control laser cladding coating microstructure and hot tearings
The method of line sensibility.
Background technique
Laser melting coating is a kind of novel increasing material technology, is to act on preparatory coating using the laser beam of certain power density
On metal surface or the synchronous dusty material being sent into, melt material and metallic substrate surface, in subsequent cooling procedure
Solidification forms one layer of low dilution rate in metallic substrate surface and has the cladding layer of good metallurgical bonding, reaches material surface and repair
Multiple or increasing material manufacturing purpose.Compared to traditional surface restoration technique, laser melting and coating technique is had the advantage that
(1) dilution rate of substrate is low, generally 5% hereinafter, cladding layer and substrate form good metallurgical bonding, in conjunction with strong
Degree is high；
(2) heat input is few, and Thermal Cycling is of short duration, small to the pyrolytic damage and thermal distoftion amount of substrate；
(3) heating is exceedingly fast with cooling rate (up to 106K/s), coated grains are not easy to grow up, and can prepare the tiny conjunction of crystal grain
Gold plating；
(4) selection of material is flexible big, can select material according to actual needs, realizes that workpiece surface is wear-resisting, corrosion-resistant, resistance to
The enhancement purposes such as fatigue；
(5) laser facula is small, by mechanical arm and computer numerical control technology, realizes the essence of complex parts damaged part
Really repair.
Based on above advantage, what laser melting and coating technique was particularly suitable for high added value component remanufactures reparation, such as aviation
Blade, stator in engine, axis, the components such as turbine disk.Since the service temperature of this type component is high, stress is big, working environment
Badly, parts design manufacture is accurate, production difficulty processed is big, in addition raw material price itself is higher, so that this kind of impaired zero
Component to remanufacture added value higher.
However the cooling rate due to being exceedingly fast in laser cladding process, cause it to generate great heat in process of setting and answers
Power is easy to induce the generation of fire check (mainly solidification cracking and liquation crack).Especially nickel base superalloy, due to alloy
In joined many such as Al, Ti, Nb, Mo intensified elements, it is easy to form Low melting point eutectic in the welding process, such as
Laves phase in Inconel718 alloy.During multi-track overlapping, these Low melting point eutectics in heat affected area hold
Easily liquefaction film can be formed by refuse.Since liquefaction film cannot transmit stress, the thermal stress in process of setting can be a large amount of
It is focused at these liquefaction films, forms stress and concentrate, when stress reaches material limits, liquefaction film will be pulled open, and formation is split
Line --- i.e. liquation crack.Liquation crack is one of the major defect for limiting nickel base superalloy laser melting coating, it is necessary to it
It is controlled.
And the prior art does not provide the method that can control well cracks in laser cladding coat.
Summary of the invention
In view of the above drawbacks of the prior art, technical problem to be solved by the invention is to provide one kind effectively to control
The method of cracks in laser cladding coat processed.
To achieve the above object, the present invention provides a kind of control laser cladding coating microstructure and fire check sensibility
Method, including in laser cladding process change laser incident angle, to change the microstructure and life of cladding coating
Long orientation, and then change the resistance of the heat resistanceheat resistant crack initiation of cladding coating, achieve the purpose that control the formation of cladding fire check.
Further, the change of the incident angle of laser is by rotating laser head in cladding process or guiding optical cable come real
It is existing.
Specifically, a kind of method of of the invention control laser cladding coating microstructure and fire check sensibility include with
Lower step:
Step 1 provides laser head or optical fiber；The material for being used for cladding is placed in substrate such as metallic surface；
Step 2 makes laser head transmitting semiconductor laser or makes fibre optical transmission optical-fiber laser, and cladding substrate surface is used for
The material of cladding forms molten bath, and molten bath solidifies to form cladding coating；Wherein, in cladding process, rotating laser head or guidance light
Fibre keeps the incident angle of laser not vertical with substrate, and changes the incident angle of laser.
Step 3, the change of the incident angle of laser is so that the pattern in molten bath and temperature field change, to change molten
The microstructure and the orientation of growth of coating are covered, and then changes the resistance of the heat resistanceheat resistant crack initiation of cladding coating.
Further, the material for cladding of substrate surface is powder particle, silk material or thin slice.
Further, in cladding process, powder particle is sent to the surface of substrate, and powder in real time by powder feeding gas
Particle is protected using protection gas, such as argon gas.
Further, it is coated on the surface of substrate in advance before cladding for the material of cladding or the material of cladding will be used for
It is sent in real time to the surface of substrate.
Further, fire check refers to the solidification cracking and liquation crack formed in cladding process.
Further, after the change of microstructure refers to that the incident angle due to laser changes, laser beam is in molten bath
Energy distribution is correspondingly changed, so change molten bath pattern and its interior temperature field, thus change substrate and
The solidification behavior of molten pool metal forms the microstructure of different-shape.
Further, after the change of the orientation of growth of cladding coating refers to the incident angle deflection due to laser, more
Focusing laser energy is in the side in molten bath, so that the uniformity of hot-fluid is improved in molten bath, to increase the life of cladding coating
Long orientation.
Further, the change of the resistance of the heat resistanceheat resistant crack initiation of cladding coating refers to the incident angle deflection due to laser
Afterwards, the lateral heat dissipation in molten bath is improved, and the angle between direction of heat flow and a dendrite growth direction is increased, so that one
The growth of secondary dendrite is inhibited and the growth of secondary dendrite is improved, to increase the friendship between a dendrite
Fork connection, improves the heat resistanceheat resistant crackle ability of cladding coating, reduces the fire check sensibility of cladding coating.
The method of control laser cladding coating microstructure and fire check sensibility of the invention is by changing entering for laser
Firing angle degree has efficiently controlled the microstructure and fire check sensibility of cladding coating, and this method is easy to operate, strong operability
And effect is good, is suitable for the preparation process of all kinds of laser cladding coatings, is particularly suitable for the laser melting coating of nickel base superalloy.
It is described further below with reference to technical effect of the attached drawing to design of the invention, specific structure and generation, with
It is fully understood from the purpose of the present invention, feature and effect.
Detailed description of the invention
Fig. 1 is the cladding process schematic diagram of a preferred embodiment of the invention, and wherein laser beam is to lean forward；
Fig. 2 is another cladding process schematic diagram of a preferred embodiment of the invention, and wherein laser beam is hypsokinesis；
Fig. 3 is that a preferred embodiment of the invention is obtained molten at 0 °, 10 °, 20 ° and 30 ° of hypsokinesis of laser beam difference
Cover the metallographic structure figure of coating；
Fig. 4 is that a preferred embodiment of the invention is obtained molten at 0 °, 10 °, 20 ° and 30 ° of hypsokinesis of laser beam difference
Cover the EBSD test result of coating；
Fig. 5 is the dendrite shape appearance figure of a resulting cladding coating of preferred embodiment of the invention；
Fig. 6 is the SEM shape appearance figure of a resulting cladding coating of preferred embodiment of the invention；
Fig. 7 is the list of a preferred embodiment resulting cladding coating of cladding under different laser incident angles of the invention
The statistical result of total crack length of position sectional area；
Fig. 8 is ecotone formation mechenism schematic diagram in the cladding coating of a preferred embodiment of the invention；
Fig. 9 is<001>branch crystal orientation<100>dendrite transformation mechanism schematic diagram of a preferred embodiment of the invention；
Figure 10 be a preferred embodiment of the invention in laser cladding process when laser beam vertical incidence molten bath dissipate
Relation schematic diagram between thermal field and temperature gradient and growth rate；
Figure 11 be a preferred embodiment of the invention in laser cladding process when laser hypsokinesis the heat dissipation field in molten bath and
Relation schematic diagram between temperature gradient and growth rate.
Specific embodiment
As illustrated in fig. 1 and 2, a preferred embodiment of the invention provides a kind of control laser cladding coating microstructure
And the method for fire check sensibility, comprising the following steps:
Step 1 provides laser head 1；The material 6 for being used for cladding is placed to the surface of substrate 4；
Step 2, makes laser head emit high energy laser beam 2, and the material 6 for cladding on 4 surface of cladding substrate is formed
Molten bath 5, the solidification of molten bath 5 form cladding coating 3；Wherein, in cladding process, rotating laser head 1 makes the incident angle of laser not
It is vertical with substrate 4, and change the incident angle of laser.
Step 3, the change of the incident angle of laser is so that the pattern in molten bath 5 and temperature field change, to change molten
The microstructure and the orientation of growth of coating 3 are covered, and then changes the resistance of the heat resistanceheat resistant crack initiation of cladding coating 3, to reach control
The microstructure of cladding coating 3 processed and the purpose of fire check sensibility.
Arrow 9 in Fig. 1 and Fig. 2 indicates the direction of cladding.
In the present embodiment, substrate 4 is metal sample, and the material 6 for cladding on 4 surface of substrate is powder particle, at it
It may be silk material or thin slice in its embodiment.Laser head 1 is semiconductor laser head, and the semiconductor that can generate high-energy swashs
Light, laser head 1 could alternatively be the optical fiber for generating optical-fiber laser in other embodiments.The cladding coating 3 that the present embodiment obtains
For Inconel718 coating.
In the cladding process of the present embodiment, powder particle is sent to the surface of substrate 4, and powder in real time by powder feeding gas 8
Last particle is protected using protection gas 7, generally uses argon gas.In other embodiments, it will can also be used for cladding in advance
Material is coated on the surface of substrate.Fire check in the present embodiment refers to that the solidification cracking formed in cladding process and liquefaction are split
Line.
In the control laser cladding coating microstructure of the present embodiment and the method for fire check sensibility, microstructure
Changing after referring to that the incident angle due to laser changes, Energy distribution of the laser beam 2 in molten bath 5 is correspondingly changed,
And then change the pattern in molten bath 5 and its interior temperature field to change the solidification behavior of substrate 4 forms different-shape
Microstructure.After the change of the orientation of growth of cladding coating 3 refers to the incident angle deflection due to laser, more laser energies
The side in molten bath 5 is focused on, so that the uniformity of hot-fluid is improved in molten bath 5, to increase the orientation of growth of cladding coating.
After the change of the resistance of the heat resistanceheat resistant crack initiation of cladding coating 3 refers to the incident angle deflection due to laser, the lateral of molten bath 5 dissipates
Heat is improved, and increases the angle between direction of heat flow and a dendrite growth direction, so that the growth of a dendrite
It is inhibited and the growth of secondary dendrite is improved, to increase the intersection between a dendrite to connect, improves
The heat resistanceheat resistant crackle ability of cladding coating 3, reduces the fire check sensibility of cladding coating 3.
Fig. 3 is the present embodiment in laser beam difference 0 ° of hypsokinesis (Fig. 3-a), 10 ° (Fig. 3-b), 20 ° (Fig. 3-c) and 30 ° of (figures
3-d) the metallographic structure figure of obtained cladding coating 3, the microstructure of cladding coating 3 is mainly by columnar dendrite 11 and top
A small amount of isometric dendrite 12 forms.As seen from the figure, with the increase of laser incident angle, the isometric dendrite at top
Content also increased.It can see from the trace 10 of 5 tail portion solid-liquid interface of molten bath, when laser head does not rotate, molten bath 5
The relatively flat length of solid-liquid interface, slope portion are smaller；And after increasing the incident angle of laser beam 2, the interface of solid-liquid becomes short and steep.Thus
It is found that the pattern in molten bath 5 is correspondingly changed after the incident angle of laser beam 2 changes.
Fig. 4 is that the present embodiment is surveyed in the EBSD of laser beam difference 0 °, 10 °, 20 ° and 30 ° obtained cladding coating 3 of hypsokinesis
Test result, wherein Fig. 4-a, Fig. 4-b, Fig. 4-c, Fig. 4-d are respectively 0 °, 10 °, 20 ° and 30 ° gained cladding coating of laser beam hypsokinesis
Crystal orientation figure, correspond respectively to the A in Fig. 3, B, C, tetra- test zones of D.As it can be seen that increasing in 2 incident angle of laser beam
When to 10 ° and 20 °, the crystal grain of cladding coating is become larger, and illustrates that the orientation of its crystal increased.Fig. 4-e is IPF figure,
Fig. 4-f, Fig. 4-g, Fig. 4-h, Fig. 4-i are respectively the crystal orientation of 0 °, 10 °, 20 ° and 30 ° gained cladding coating of laser beam hypsokinesis
Pole figure is counted, the A in Fig. 3, B, C, tetra- test zones of D are corresponded respectively to.It can be seen that the spot phase in Fig. 4-g and Fig. 4-h
It must more concentrate, also further demonstrated that when 2 incident angle of laser beam increases to 10 ° and 20 ° than in Fig. 4-f and Fig. 4-i,
The orientation of crystal increased.Through the IPF of Fig. 4-e figure it is recognised that when 2 incident angle of laser beam is 0 ° and 10 °, crystalline substance
The direction of growth of body is mainly<001>direction, and when 2 incident angle of laser beam is 20 ° and 30 °, along<110>direction and<111
The crystal of > direction growth increased, and illustrates the change of 2 incident angle of laser beam, not only changes the uniformity of crystal orientation,
Also change the directionality of crystal growth.
Fig. 5 is the dendrite shape appearance figure of the resulting cladding coating of the present embodiment, wherein shown in Fig. 5-a, Fig. 5-b and Fig. 5-c
Be respectively 0 °, 10 ° and 20 ° of 2 hypsokinesis of laser beam gained cladding layer microscopic dentrites pattern.It can be seen that due to laser beam 2
The orientation uniformity of crystal increases after 10 ° and 20 ° of rotation, the dendrite growth in Fig. 5-b and Fig. 5-c obtain it is more consistent,
It is bigger that crystal grain also compares Fig. 5-a.From figure it is also found that in addition to typical dendrite, some bands are yet formed in coating
Shape tissue 13, and these banded structures arrange after laser beam rotates 10 ° and 20 ° more orderly, respectively in Fig. 5-b and Fig. 5-c
Middle formation and substrate are at 38 ° and 180 ° of angle.Fig. 5-d- and Fig. 5-e is the micro- of area d in Fig. 5-b and Fig. 5-c and area e respectively
See dendrite pattern.It can be seen that, since laser melting coating cooling rate is exceedingly fast, primary<001>dendrite is formed from Fig. 5 (d)
14 relatively carefully and vertically grow with matrix, and secondary dendrite 16 then between vertical-growth and a dendrite 14, forms typical tree
Dendrite morphology.However ribbon tissue 13 then intersects between growth and a dendrite 14, and this is by the tree of each independent growths
Dendrite 14 connects, therefore this tissue is named as " ecotone " by the present invention.It can be seen that, further increased from Fig. 5-e
2 hypsokinesis angle of laser beam also induces the raw transformation from<001>dendrite 14 to<100>dendrite 15 of dendrite to 20 °.
Fig. 6 is the SEM shape appearance figure of the resulting cladding coating of the present embodiment, gained when wherein Fig. 6-a is 10 ° of laser beam hypsokinesis
The microscopic appearance of coating, Fig. 6-b are the microscopic appearance of regional area b in Fig. 6-a.The darker region of color is dendrite in figure
14,16, and the brighter region of color is to solidify the most later period to be formed by low melting point eutectic Laves phase 18, due to containing in Laves18
Measure the biggish atom of the atomic numbers such as a large amount of Nb, Mo, Ti, thus its color is brighter in the secure execution mode (sem.From Fig. 6-b it can be found that
" ecotone " 13 is formed since the secondary dendrite 16 between an adjacent dendrite 14 closely connects.It " is handed in formation
While wrong band " 13, the element of a large amount of diffusion coefficient K < 1, such as Nb, Mo, Ti, Al, Si, B are largely drained into adjacent area
In domain 17, to promote the Laves/ gamma reaction in the region 17.It can be considered that the formation of " ecotone " 13 is branch
Crystalline substance, the result of the competitive growth of especially secondary dendrite 16 and Laves phase.
Fig. 7 is that the present embodiment unit cross-sectional area of the resulting cladding coating of cladding under different laser incident angles is always split
The statistical result of line length.It can be seen that total crack length is minimum when 2 incident angle of laser beam increases to 10 °, then with
The crack sensitivity of the increase of 2 incident angle of laser beam, coating increases therewith again.The reduction of crack sensitivity be on the one hand due to
The increase of the orientation of growth of crystal is as shown in Figure 4 10 ° in 2 incident angle of laser beam, crystal orientation is the most consistent.
It is directly related with the misorientation of crystal boundary that some researches show that the sensibility of fire check, after grain boundary orientation increases, the liquid of grain boundaries
Membrane stability increases, it will could solidify at lower temperatures.And the stress in material cannot be transmitted by liquid, thus
Thermal stress is caused to be concentrated at final solidified liquid film.When stress has been more than the limiting range of stress that liquid film can bear, liquid film will be by
It pulls open, forms crackle.And the increase of crystal orientation, the misorientation of crystal boundary will be reduced, to reduce the stability of liquid film.It is another
It is a the reason is that due to 2 incident angle of laser beam to 10 ° when, the formation of " ecotone " 13 is improved, to increase cladding
The ability of the anti-crack of coating itself, to reduce the fire check sensibility of cladding coating.
Fig. 8 is ecotone formation mechenism schematic diagram in the cladding coating of the present embodiment.As shown, " ecotone " 13 be by
A large amount of secondary dendrite 16 is mutually close between primary tree dendrite arm 14 connects and is formed.In process of setting, dendrite 14 is general
Opposite direction along hot-fluid 19 is grown, but due to crystallographic preferred orientation, crystal is not fully grown along the opposite direction of hot-fluid, and
It is that there are certain anglesIn the case where 2 vertical incidence of laser beam,Value is smaller, and a dendrite 14 is grown comparatively fast, and two
The secondary growth of dendrite 16 is slower, and interconnection is limited, so the development of " ecotone " 13 is unobvious.And work as 2 incident angle of laser beam
After increase, lateral heat dissipation is improved, the angle between dendrite 14 and hot-fluid 19It increases with it, due to a dendrite
14 deviate from the angle of its growth of optimum, and growth is restricted.And at the same time, between secondary dendrite 16 and hot-fluid 19
Angle become smaller, thus the growth of more conducively secondary dendrite 16 improves branch to increase the formation of " ecotone " 13
Connection between crystalline substance 14.The anti-crack ability of cladding coating increases therewith, and crack sensitivity reduces.
Fig. 9 is the present embodiment<001>branch crystal orientation<100>dendrite transformation mechanism schematic diagram.When 2 angle of laser beam into
Angle after one step increase, between dendrite 14 and hot-fluid 19It further increases.Thus the growth of a dendrite 14 is into one
Step is inhibited, and the growth of secondary dendrite 16 is then further enhanced.In some regions, secondary dendrite 16 is grown up into
Dendrite, the transformation so as to complete<001>dendrite 14 to<100>dendrite 15.
Figure 10 and 11 is the present embodiment laser beam vertical incidence and molten bath when laser hypsokinesis in laser cladding process respectively
Heat dissipation field and temperature gradient and growth rate between relation schematic diagram.When 2 vertical incidence of laser beam, as shown in Figure 10,
High-temperature area 20 in molten bath 5 focuses primarily upon top, and when heat is spread downwards, due to by the right and left air and
The cooling effect of gel coating, hot-fluid can be dissipated to both sides, cause hot-fluid in the inhomogeneities of 5 part of molten bath.And work as laser beam 2
When angle increases, since laser mainly acts on the front side portion in molten bath 5, the lateral temperature gradient in molten bath 5 is promoted, thus
The cooling effect of frozen metal side is improved, and correspondingly the cooling effect of molten bath front end air side is suppressed, and is led
The uniform of hot-fluid in molten bath 5 is caused to be improved, to increase the orientation uniformity of crystal.Simultaneously as 5 side of molten bath to heat dissipation
Enhanced, so that the angle between hot-fluid 19 and a dendrite 14It is improved, promotes the growth of secondary dendrite,
So that the pattern of " ecotone " 13 becomes apparent.After increasing due to 2 incident angle of laser beam, a large amount of focusing laser energy is in molten
The front end in pond 5 changes the pattern of molten bath tail portion, so that the slope portion of 5 tail portion solid-liquid interface of molten bath, i.e. α value reduce.Study table
Bright, the growth of columnar dendrite 11 meets following curing condition:
Wherein G is temperature gradient, and V is solidification rate, and KCET and n are parameter relevant to material, wherein to base nickel high temperature
For alloy, general n 3.4.When the condition in equation (1) is destroyed, then the growth of columnar dendrite 11 cannot be maintained discontinuously,
Columnar dendrite translates into isometric dendrite.Since in laser cladding process, dendrite is mainly grown along<001>direction, then
The growth of columnar dendrite must satisfy:
After 2 incident angle of laser beam increases, α value reduces, so that G001 is reduced and V001 increase, so that meeting column tree
Brilliant 11 growth conditions are easily destroyed.After the incident angle for thus increasing laser beam 5, the growth of the isometric dendrite 12 at top is
It improves.It can similarly obtain, dendrite is respectively as follows: along the curing condition that<001>direction and<100>direction are grown
And when α value reduce when, ratio | G001 | 3.4/V001 reduce and | G100 | 3.4/V100 increase, thus be easy induce
<001>transformation of the dendrite 14 to<100>dendrite.
Cladding Inconel718 alloy is resulting when experimental result listed by the present embodiment is all laser incident angle hypsokinesis,
But it is not intended to limit the invention to laser beam hypsokinesis, also it is not intended that the material of cladding is only defined in Inconel718 alloy,
Do not mean that laser incident angle is only limited to 0 ° mentioned in the present invention more, 10 °, 20 ° and 30 °, but can be directed to specific
Laser melting coating system and cladding material and production practices in problem to be solved and flexibly change.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of method of control laser cladding coating microstructure and fire check sensibility, which is characterized in that be included in laser
The incident angle for changing laser in cladding process, to change growth ability and the life of the dendrite of the microstructure of cladding coating
Long orientation, and then change the resistance of the heat resistanceheat resistant crack initiation of cladding coating, the incident direction of the laser and the cladding coating
The angle of the normal of plane is 10 °, 20 ° or 30 °.
2. the method for control laser cladding coating microstructure according to claim 1 and fire check sensibility, feature
It is, the change of the incident angle of the laser is realized by rotating laser head in cladding process or guiding optical cable.
3. a kind of method of control laser cladding coating microstructure and fire check sensibility, which is characterized in that including following step
It is rapid:
Step 1 provides laser head or optical fiber；The material for being used for cladding is placed in the surface of substrate；
Step 2 makes laser head transmitting semiconductor laser or makes fibre optical transmission optical-fiber laser, and cladding substrate surface is used for cladding
Material, formed molten bath, molten bath solidifies to form cladding coating；Wherein, in cladding process, rotating laser head or guiding optical cable,
Keep the incident angle of laser not vertical with substrate, and change the incident angle of laser, the incident direction of the laser is melted with described
The angle for covering the normal of coated facet is 10 °, 20 ° or 30 °；
Step 3, the change of the incident angle of laser is so that the pattern in molten bath and temperature field change, to change cladding painting
The growth ability of the dendrite of the microstructure of layer and the orientation of growth, and then change the resistance of the heat resistanceheat resistant crack initiation of cladding coating
Power.
4. the method for control laser cladding coating microstructure according to claim 3 and fire check sensibility, feature
It is, the material for cladding is coated on the surface of substrate in advance before cladding or send the material for being used for cladding to base in real time
The surface of material.
5. the method for control laser cladding coating microstructure according to claim 3 and fire check sensibility, feature
It is, the material for cladding of the substrate surface is powder particle, silk material or thin slice.
6. the method for control laser cladding coating microstructure according to claim 5 and fire check sensibility, feature
It is, in cladding process, is in real time sent the powder particle to the surface of the substrate, and the powder by powder feeding gas
Particle is protected using protection gas.
7. the method for control laser cladding coating microstructure according to claim 3 and fire check sensibility, feature
It is, the fire check refers to the solidification cracking and liquation crack formed in cladding process.
8. the method for control laser cladding coating microstructure according to claim 3 and fire check sensibility, feature
It is, after the change of microstructure refers to that the incident angle due to laser changes, Energy distribution of the laser beam in the molten bath
Correspondingly changed, so change the molten bath pattern and its interior temperature field, to change substrate and molten bath
The solidification behavior of metal forms the microstructure of different-shape.
9. the method for control laser cladding coating microstructure according to claim 3 and fire check sensibility, feature
It is, after the change of the orientation of growth of cladding coating refers to the incident angle deflection due to laser, more focusing laser energies
In the side in molten bath, so that the uniformity of hot-fluid is improved in the molten bath, to increase the orientation of growth of cladding coating.
10. the method for control laser cladding coating microstructure according to claim 3 and fire check sensibility, feature
It is, after the change of the resistance of the heat resistanceheat resistant crack initiation of cladding coating refers to the incident angle deflection due to laser, the molten bath
It is lateral heat dissipation be improved, the angle between direction of heat flow and a dendrite growth direction is increased, so that a branch
Brilliant growth is inhibited and the growth of secondary dendrite is improved, so that the intersection increased between a dendrite connects
It connects, improves the heat resistanceheat resistant crackle ability of cladding coating, reduce the fire check sensibility of cladding coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510926327.6A CN105506615B (en) | 2015-12-11 | 2015-12-11 | A method of control laser cladding coating microstructure and fire check sensibility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN110453167A (en) * | 2019-09-02 | 2019-11-15 | 铜陵学院 | A kind of laser melting layer tissue accuracy control method |
| CN111005020B (en) * | 2019-12-10 | 2020-12-11 | 清华大学 | Method for preventing liquefaction cracks |
| CN111611734A (en) * | 2020-04-21 | 2020-09-01 | 金华职业技术学院 | Finite element calculation method for predicting laser cladding layer top turning dendritic crystal region |
| WO2024019059A1 (en) * | 2022-07-19 | 2024-01-25 | 国立大学法人大阪大学 | Inorganic structure and method for producing inorganic structure |
| CN115319101B (en) * | 2022-08-27 | 2023-06-13 | 中国长江电力股份有限公司 | Method for repairing Babbitt metal tile by laser cladding |
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