CN105256311B - A kind of method of sensing heating control Laser Direct Deposition high temperature alloy oriented growth - Google Patents
A kind of method of sensing heating control Laser Direct Deposition high temperature alloy oriented growth Download PDFInfo
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- CN105256311B CN105256311B CN201510820837.5A CN201510820837A CN105256311B CN 105256311 B CN105256311 B CN 105256311B CN 201510820837 A CN201510820837 A CN 201510820837A CN 105256311 B CN105256311 B CN 105256311B
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- molten bath
- laser direct
- high temperature
- direct deposition
- thermograde
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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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- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- General Induction Heating (AREA)
Abstract
The invention discloses a kind of method of sensing heating control Laser Direct Deposition high temperature alloy oriented growth.During high temperature alloy Laser Direct Deposition, base bottom employs convection current cooling, and molten bath is radiated along Z-direction, forms the positive thermograde of Z-direction, make column crystal along Z-direction epitaxial growth.Molten bath two side areas mainly makes thermograde be deflected to R directions in process of setting due to directly being contacted with protection gas to protection gas radiating, so as to cause the column crystal direction of growth to deflect, the final microstructure and mechanical property for influenceing drip molding.Regarding to the issue above, load coil is taken nearby to preheat molten bath, suppress molten bath to radiate to R directions, prevent thermograde from deflecting, ensure that Z-direction thermograde plays a leading role in whole molten bath process of setting, the orientation crystalline substance of two side areas around molten bath is still grown along Z-direction, ensure that drip molding finally obtains continuous whole orientation crystal solidification tissue and excellent mechanical property with this.
Description
Technical field
The present invention relates to metal material increasing field, more particularly to a kind of sensing heating control Laser Direct Deposition high temperature closes
The method of golden oriented growth.
Background technology
Laser Direct Deposition technology is a kind of common increases material manufacturing technology for being mainly used in metal material shaping, from 20 generation
Record since occurring the initial stage nineties, worldwide cause extensive concern and research.Laser Direct Deposition technology will swash
Light melting and coating technique and rapid prototyping technology are combined together, and be relate to Ji calculations machine Fu and are helped She Ji ﹑ Kuai short-term training Xing ﹑ Ji Guang Jia Gong ﹑ materials
Each field subject such as material science and control technology, consistency can be directly produced close to 100%, mechanical property is suitable with forging
And complex-shaped metal parts, there is good application prospect in the field such as Hang ﹑ biologic medicals of Hang skies and war industry equipment.Root
According to the existing theory that brilliant tissue growth is oriented on Laser Direct Deposition, during Laser Direct Deposition, make molten bath and base
Top-down ultra high temperature gradient is formd between plate and (can reach 106K/m), under the cooling velocity of superelevation, molten bath moment
Solidify (setting rate can reach 24mm/s), cladding layer microstructure is presented along Z axis and force orientation crystals growth rule.It is so warm
Degree gradient is to influence the main drive of orientation crystals growth, wants to obtain the brilliant tissue of good orientation, it is necessary to enter base bottom
Row convection current is cold to improve thermograde, but whether cooled down to matrix using which kind of method to increase thermograde, molten bath
The thermograde of two side areas still will not be along Z-direction, and this is due to that it directly contacts and carried out with the protection gas of surrounding
Heat transfer, cooling velocity also quickly, cause the thermograde in R directions to start to have an impact the brilliant growth of orientation, and with
The continuous accumulation of heat in forming process, the thermograde of Z-direction has reduced, and the influence of R directions thermograde is got over
Come it is more obvious so that orientation crystals growth direction deflect and can not along Z-direction epitaxial growth, finally have impact on entirely into
The microstructure and performance of shape part.
The content of the invention
Deflected it is an object of the invention to overcome molten bath both sides thermograde in above-mentioned high temperature alloy forming process
Problem, there is provided a kind of method of sensing heating control Laser Direct Deposition high temperature alloy oriented growth, this method ensures whole molten
Pool area is kept in process of setting along the positive thermograde of Z-direction, drip molding is had more completely along Z-direction extension
The brilliant tissue of the orientation of growth.
The realization of technical solution of the present invention comprises the following steps：
1) induction coil is determined according to the contours profiles of formation of parts or the matrix contour shape for needing to repair part
Shape, it is shaped as the equidistant outline curve of parts profile；
2) induction coil is installed to correct position, coil mid-plane is located at more than matrix profiled surface 0.5~5mm
Opening position, while infrared temperature probe position is adjusted, infrared measurement of temperature hot spot is located at below matrix profiled surface at 0.2~3mm,
And the temperature of infrared temperature-controlling system is set to 500~1000 DEG C；
3) cooling-water duct of connection on the table is first opened, induction heating apparatus is opened afterwards, to matrix profiled surface
Near zone is preheated to design temperature, opens metal laser direct-forming system, and laser power drops relative to normal laser forming
Low 10~30%, carry out first layer cladding forming；
4) after the completion of one layer, a shaping 0.1~1mm of layer height is risen, induction coil and infrared probe rise identical
Highly, next layer of cladding forming is carried out；
5) (4) step is repeated, the Laser Direct Deposition until completing whole entity component, part needed for acquisition.
The solution have the advantages that：The part and repair part with more completely along Z that the present invention makes finally to shape
The brilliant tissue of the orientation of direction of principal axis epitaxial growth, improves its mechanical property, and orienting crystal class part for high temperature alloy, (particularly orientation is brilliant
The aerospace field such as blade vital part) Laser Direct Deposition and laser repairing provide directive function, swash in high temperature alloy
Light material increasing field brings obvious economic benefit.
Brief description of the drawings
Fig. 1 is the principle schematic of the sensing heating control orientation crystals growth of the inventive method.
Fig. 2 (a) is the metallograph of the DZ125L entity regional areas shaped under non-inductive heating.
Fig. 2 (b) is the metallograph for having the DZ125L entity regional areas shaped under sensing heating.
Fig. 3 (a) is the metallograph of the DZ125L entity borderline regions shaped under non-inductive heating.
Fig. 3 (b) is the metallograph for having the DZ125L entity borderline regions shaped under sensing heating.
Embodiment
The present invention find first optimal induction coil Xing Zhuan ﹑ coil copper pipes Zhi Jing ﹑ induction coils position and
The parameters such as induction heating temperature, induction coil is set to be located at suitable position, heat effect is limited only to molten bath near zone, not shadow
Molten bath zone is rung to the positive thermograde of Z-direction of substrate, but inhibits the temperature ladder in R directions in the process of setting of molten bath again simultaneously
Degree.Molten bath near zone is heated finally, due to employ sensing heating, sensing heating turn into formed molten bath thermal source it
One, it is possible to suitably Optimizing Process Parameters (reducing laser power, improve sweep speed), and laser energy phase interworking
Close, complete forming process jointly.
In forming process of the present invention, coil and infrared temperature probe follow the rising of cladding plane under slide unit drive
And rise identical distance, ensure when carrying out each layer of cladding forming, coil and infrared measurement of temperature hot spot are all in relative to molten
The optimal position of plane fixation is covered, Z-direction thermograde is turned into the leading driving force of molten bath two side areas orientation crystals growth, most
The part of shaping or the region of reparation is set to have more completely along the brilliant tissue of orientation of Z-direction epitaxial growth eventually.
Sensing heating control DZ125L cylindrical solid orientation of the parts crystals growth experiment
(A) the shaped cylinder entity under no progress sensing heating control
Basic technological parameters：30~60 μm, laser power 200W, laser spot diameter 0.5mm of powder size, sweep speed
8mm/s, 8.7~9.3g/min of powder sending quantity, Z axis lifting capacity △ Z=0.10mm, overlapping rate 34%.
Φ 7mm DZ125L high temperature alloy cylindrical solids are shaped on diameter of phi 10mm 40Cr cylindrical matrixes, shaping is high
Spend 5mm.
(B) the shaped cylinder entity under sensing heating control
Basic technological parameters：30~60 μm, laser power 150W, laser spot diameter 0.5mm of powder size, sweep speed
8mm/s, 8.7~9.3g/min of powder sending quantity, Z axis lifting capacity △ Z=0.10mm, overlapping rate 34%, induction coil are individual pen annulus
Shape, internal radius 20mm, coil internal diameter of copper pipe 6mm, 990 DEG C of sensing heating design temperature, coil mid-plane be located at matrix into
Shape surface above 0.8mm.
Φ 7mm DZ125L high temperature alloy cylindrical solids are shaped on diameter of phi 10mm 40Cr cylindrical matrixes, shaping is high
Spend 5mm.
Induction coil 4 is installed to correct position by I, first, coil mid-plane is located at more than the profiled surface of matrix 3
0.8mm opening positions, while the position of infrared temperature probe 5 is adjusted, infrared measurement of temperature hot spot is located at below the profiled surface of matrix 3
At 0.2mm, and the temperature of infrared temperature-controlling system is set to 990 DEG C；
II, first opens cooling-water duct 1, opens induction heating apparatus afterwards, make induction coil 4 to matrix profiled surface near
Region carries out being preheated to design temperature, opens metal laser direct-forming system, carries out first layer cladding forming；
After the completion of III mono- layer of, rise a shaping layer height 0.1mm, induction coil 4 and infrared probe 5 rise identical
Height 0.1mm, carry out next layer of cladding forming；
IV, repeats III step, the Laser Direct Deposition until completing whole cylindrical solid, obtains the cylinder that height is 5mm
Entity.
After the completion of shaping, sample is carried out wire cutting, inlay, roughly grind, fine grinding, polishing, corrosion, finally in KEYENCE
Observation orients brilliant tissue growth situation under VH-8000 digit optical microscopes.
Fig. 2 is that non-inductive computer heating control and having senses the identical part of the DZ125L solid cylindricals that shape under the conditions of computer heating control
The metallographic structure figure in region.In Fig. 2 (a) of non-inductive heating, two side areas can occur in each molten bath process of setting
Crystalline substance is turned to, it is brilliant more so as to cause to turn in final drip molding microstructure, cuted through during cutting on line, in gold
The shape that ellipticity is similar to equiax crystal is presented in phasor；On the contrary, in the case where Fig. 2 (b) has sensing heating condition, each is eliminated
The R of two side areas makes the orientation of two side areas brilliant same with intermediate region along Z-direction to thermograde in the process of setting of molten bath
Epitaxial growth, more completely organized so as to ensure that whole drip molding has along the orientation crystalline substance of Z-direction, during cutting on line
Completely splitted from top to bottom along Z-direction, elongated strip is presented in metallograph.In the non-inductive heating conditions of Fig. 3 (a)
Under, the steering crystalline substance peak width of drip molding vertical section edge reaches 228.25 μm；And in the case where Fig. 3 (b) has sensing heating condition,
Turn to brilliant width and there was only 63.09 μm.As can be seen here, sensing heating controls for the thermograde in melt tank edge region and orientation is brilliant
It is obvious to grow control action, makes drip molding that there is the more complete brilliant tissue of orientation.
Claims (2)
- A kind of 1. method of sensing heating control Laser Direct Deposition high temperature alloy oriented growth, it is characterised in that make entirely into Shape part has more completely along the brilliant tissue of orientation of deposition direction epitaxial growth, comprises the following steps：1) according to the contours profiles of formation of parts or the matrix contour shape for repairing part is needed to determine the shape of induction coil, It is shaped as the equidistant outline curve of parts profile；2) induction coil (4) is installed to correct position, coil mid-plane is located at matrix (3) profiled surface above 0.5mm ~5mm opening positions, while infrared temperature probe (5) position is adjusted, infrared measurement of temperature hot spot is located at below matrix (3) profiled surface At 0.2mm~3mm, and the temperature of infrared temperature-controlling system is set to 500 DEG C~1000 DEG C；3) cooling-water duct (1) being connected on workbench (2) is first opened, opens induction heating apparatus afterwards, table is shaped to matrix Face near zone is preheated to design temperature, opens metal laser direct-forming system, laser power is relative to normal laser forming 10~30% are reduced, carries out first layer cladding forming；4) after the completion of one layer, a shaping layer height 0.1mm~1mm is risen, induction coil (4) and infrared probe (5) rise phase Same height, carry out next layer of cladding forming；5) (4) step is repeated, the Laser Direct Deposition until completing whole entity component, part needed for acquisition.
- 2. the method for sensing heating control Laser Direct Deposition high temperature alloy oriented growth according to claim 1, it is special Sign is that the section shape and size of induction coil will equally determine according to shaping or the part shape repaired in step 1), line Circle is divided into circular and square according to copper pipe cross sectional shape, and the copper pipe external diameter of circular cross-section coil is 3mm~12mm, square-section line The long width of copper pipe of circle is all 4mm~20mm, and for coil inner surface apart from matrix side 2mm~25mm, wire circle is 1~8 circle.
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| CN112760641A (en) * | 2020-12-26 | 2021-05-07 | 南京中科煜宸激光技术有限公司 | Laser cladding process and laser cladding repairing and processing system based on thermal aging treatment |
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| CN101125394A (en) * | 2007-06-13 | 2008-02-20 | 华中科技大学 | Automatic powder feeding laser induction composite coating method and device |
| CN101774082A (en) * | 2010-03-11 | 2010-07-14 | 扬州市职业大学 | Laser forming device |
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Patent Citations (3)
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| CN101125394A (en) * | 2007-06-13 | 2008-02-20 | 华中科技大学 | Automatic powder feeding laser induction composite coating method and device |
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