CN114507854A - Online cooling and heat treatment method for repairing heat-treatable aluminum alloy based on laser - Google Patents
Online cooling and heat treatment method for repairing heat-treatable aluminum alloy based on laser Download PDFInfo
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- CN114507854A CN114507854A CN202210112891.4A CN202210112891A CN114507854A CN 114507854 A CN114507854 A CN 114507854A CN 202210112891 A CN202210112891 A CN 202210112891A CN 114507854 A CN114507854 A CN 114507854A
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Abstract
The invention relates to the field of laser repair of aluminum alloy, in particular to an online cooling and heat treatment method for repairing heat-treatable aluminum alloy based on laser cladding. The treatment method comprises the steps of carrying out laser cladding repair on the aluminum alloy substrate, and carrying out online cooling in the laser cladding repair process. The research of the invention finds that the cooling speed of the cladding area can be obviously improved through on-line cooling, the depth of the heat affected area is greatly reduced, and the heat affected area is in a supersaturated solid solution state, so that the strength of the heat affected area can be well recovered by only utilizing low-temperature aging treatment during subsequent heat treatment, the problem that high-temperature solid solution treatment cannot be carried out on vehicle body parts due to large volume is solved, and the problem of thermal deformation of the material parts in high temperature can be effectively prevented.
Description
Technical Field
The invention relates to the field of laser repair of aluminum alloy, in particular to an online cooling and heat treatment method for repairing heat-treatable aluminum alloy based on laser cladding.
Background
Al6061 is an aluminum alloy which is most widely applied, belongs to a heat-treatable and reinforceable aluminum alloy, and has the advantages of medium strength, good corrosion resistance, no stress corrosion cracking tendency, good welding performance, unchanged corrosion performance of a welding area, good formability and technological performance and the like; meanwhile, the Al6061 aluminum alloy has good mechanical property, corrosion resistance and process property after being subjected to solid solution artificial aging treatment (T6), so the Al6061 aluminum alloy becomes an ideal material for vehicle body light weight and is widely applied to the field of high-speed trains.
However, with the increase of the speed and the service life of the train in recent years, higher requirements are put forward on the stability and the safety of the train body, and meanwhile, the influence of corrosion and scratch on the train body is larger because the train is exposed to various severe environments for a long time. If damaged parts are directly replaced, the expenditure cost is greatly increased and unnecessary waste is generated, so that the existing research shows that the damaged parts can be repaired by adopting the laser cladding repair technology.
Compared with the traditional welding repair, the laser cladding repair has smaller heat input, but a heat affected zone (softening zone) still exists in the cladding process, so that the performance is reduced, and the repair zone needs to be subjected to heat treatment to improve the mechanical property.
The traditional aluminum alloy heat treatment method is to carry out re-solution aging treatment on Al6061 after laser cladding repair, but because the size of parts of a vehicle body (Al6061-T6) is large, the parts cannot be put into a muffle furnace to carry out high-temperature solution treatment at the temperature of more than 500 ℃, and therefore a new method needs to be found to meet the requirement.
Disclosure of Invention
The invention provides an online cooling and heat treatment method for repairing heat-treatable aluminum alloy based on laser cladding. By the method, the mechanical strength of the aluminum alloy can be recovered by low-temperature aging treatment, the problem that high-temperature solution treatment cannot be carried out on large vehicle body parts due to large volume is solved, and the problem of thermal deformation of the material parts at high temperature can be effectively prevented.
The treatment method comprises the steps of carrying out laser cladding repair on the aluminum alloy substrate, and carrying out online cooling in the laser cladding repair process.
The research of the invention finds that the cooling speed of the cladding area can be obviously improved through on-line cooling, the depth of the heat affected area is greatly reduced, and the heat affected area is in a supersaturated solid solution state, so that the strength of the heat affected area can be well recovered by only utilizing low-temperature aging treatment during subsequent heat treatment, the problem that high-temperature solid solution treatment cannot be carried out on vehicle body parts due to large volume is solved, and the problem of thermal deformation of the material parts in high temperature can be effectively prevented.
Further, the on-line cooling is realized by a cooling device. The cooling device includes: the device comprises an atmosphere maintaining unit, a water cooling unit and a gas supply unit; the top of the atmosphere maintaining unit is semi-open; the water cooling unit is respectively connected with a water inlet pipeline and a water outlet pipeline of the atmosphere maintaining unit; the gas supply device is connected with a gas inlet pipeline of the atmosphere maintaining unit.
Studies have shown that by opening the top of the atmosphere maintaining unit, a semi-open structure design is formed, which does not affect the movement of the laser, while also maintaining the protective atmosphere. Through the structural design of the cooling device, the cladding area of the aluminum alloy substrate and the heat affected zone around the cladding area can be cooled in real time through circulating water cooling.
Furthermore, the water inlet, the water outlet and the air inlet are all fixed on the atmosphere maintaining unit, and are provided with sealing rings to prevent water leakage. The water cooling unit is connected with the water inlet and the water outlet through a water pipe. When the device works, hot water in the water outlet enters the water cooling unit, the water cooling unit is cooled through air cooling, and then the hot water enters the atmosphere maintaining unit from the water inlet, so that the flow and the temperature of the cooling water in the atmosphere maintaining unit are constant.
Meanwhile, the air inlet is connected with the argon bottle through the air pipe, argon is continuously introduced in the experimental process, and the argon can overflow from bottom to top, so that better protective atmosphere can be maintained above the aluminum alloy substrate.
Further, when laser cladding repair is performed, the laser cladding repair material is generally different from the substrate. In the invention, the substrate is 6061-T6 aluminum alloy, the tensile strength is 290MPa, and the elongation is 15%. Meanwhile, in order to ensure the strength of the sample after laser cladding repair, the repair material used for laser cladding repair is selected to be Al-Mg-Sc-Zr powder with higher strength and elongation. Meanwhile, before laser cladding repair, the repair material Al-Mg-Sc-Zr powder is required to be dried, and the drying conditions are as follows: 150 ℃ multiplied by 2 h.
Further, before laser cladding, grooving treatment is usually performed on the aluminum alloy substrate, the groove size is usually determined according to the damaged area, for example, 1 groove is formed on a 6061-T6 aluminum alloy plate with the length, width and height being 150mm, 100mm and 15mm respectively, the upper width of the groove is 9mm, the lower width of the groove is 1mm, the depth of the groove is 4mm, and the inclination of the groove is 45 degrees. And when the laser cladding repair is carried out, the liquid level is ensured to be below the substrate groove.
Further, the grooves on the aluminum alloy substrate are generally required to be pretreated before laser cladding repair. The pretreatment comprises the following steps: and (3) polishing the groove by using 800-mesh and 1500-mesh abrasive paper, then putting the substrate into a sodium hydroxide aqueous solution for cleaning to remove surface oxides, then adopting a nitric acid aqueous solution for neutralization, washing by using clear water, and then putting the substrate into a drying box for full drying.
In the invention, the technological parameters of laser cladding repair are as follows: laser power is 1400-1800W, scanning speed is 600-800mm/min, and powder feeding speed is 1000-2200mm3Min, interlaminar lapping rate of 55-85% and gas flow of 5-10L/min.
Further, carrying out low-temperature aging treatment on the aluminum alloy substrate after the laser cladding repair is finished. The conditions of the low-temperature aging treatment are as follows: aging for 12-18 h at 120-180 ℃, and air cooling.
The invention has the beneficial effects that:
the invention utilizes the simple cooling device to lead the unrepaired area of the aluminum alloy substrate to be directly contacted with the cooling water, thereby realizing on-line cooling in the cladding process, increasing the cooling speed of the cladding area, greatly reducing the depth of the heat affected area, leading the heat affected area to be in a supersaturated solid solution state, leading the material to be capable of better recovering the strength only by carrying out low-temperature aging treatment on the material, solving the problem that the high-temperature solid solution treatment cannot be carried out on the vehicle body parts due to larger volume, and simultaneously effectively preventing the thermal deformation problem of the material parts in high temperature.
Drawings
FIG. 1 is a schematic view of a simple cooling device according to the present invention.
FIG. 2 is a graph comparing strength and plasticity of the aluminum alloy samples treated in comparative example 1, comparative example 2 and example 1.
FIG. 3 is a hardness profile of the treated aluminum alloy samples of comparative example 1, comparative example 2, and example 1.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1:
the embodiment provides an online cooling and heat treatment method for repairing heat-treatable aluminum alloy based on laser cladding, which comprises the following steps:
(1) pretreatment: A6061-T6 aluminum alloy plate with the length, width and height of 150mm, 100mm and 15mm is provided with 1 through groove by adopting linear cutting, the upper width of the groove is 9mm, the lower width of the groove is 1mm, the depth of the groove is 4mm, and the inclination of the groove is 45 degrees.
Then sequentially polishing the grooves by using 800-mesh and 1500-mesh abrasive paper, then putting the substrate into a sodium hydroxide aqueous solution for cleaning to remove surface oxides, then adopting a nitric acid aqueous solution for neutralization, washing by using clear water, and then putting the substrate into a vacuum drying oven for drying for 30min at 100 ℃;
(2) laser cladding repair: putting Al-Mg-Sc-Zr powder prepared by gas atomization into an oven at 150 ℃ for drying for 2 hours, and then putting the powder into a vacuum bag for later use;
the water cooling unit is provided with: as shown in fig. 1, a water inlet and a water outlet are connected with a water cooling unit by using water pipes, then cooling water is added into an atmosphere maintaining unit, and the water cooling unit is started to ensure normal circulation of the cooling water;
placing the substrate into an atmosphere maintaining unit to ensure that the liquid level does not enter the groove below the groove of the substrate, connecting an air inlet and an argon bottle by using an air pipe, and opening a valve to introduce argon;
introducing argon for 10min, then filling dried Al-Mg-Sc-Zr powder into a powder feeder, and setting the following process parameters: laser power 1600W, scanning speed 600mm/min, powder feeder rotational speed 1.2r/min, overlap ratio 60%, in order to guarantee to fill up the recess simultaneously, print the model according to 1: 1.1, amplifying the groove, and then starting to carry out laser cladding repair on the groove;
(3) and (3) low-temperature aging treatment: and after the laser cladding repair is finished, putting the substrate into a muffle furnace for aging treatment at 150 ℃ for 15 h.
And (3) testing mechanical properties:
cutting a tensile sample and a metallographic sample from the substrate processed in the step (3) by linear cutting, carrying out tensile test after the tensile sample is ground and polished, and carrying out hardness test after the metallographic sample is ground and polished;
the test position is in the direction of the vertical surface of the groove, the test load is 0.1kg, and points are arranged on the repair interface at intervals of 0.2 mm;
the tensile test results show that: the tensile strength of the tensile sample after laser cladding repair after on-line cooling and low-temperature aging treatment is 290Pa, the elongation is 8.2 percent, the problem of performance softening is solved, and the use requirement is met.
The hardness test results are shown in FIG. 3.
Example 2:
the embodiment provides an online cooling and heat treatment method for repairing heat-treatable aluminum alloy based on laser cladding, which comprises the following steps:
(1) pretreatment: A6061-T6 aluminum alloy plate with the length, width and height of 150mm, 100mm and 15mm is provided with 1 through groove by adopting linear cutting, the upper width of the groove is 9mm, the lower width of the groove is 1mm, the depth of the groove is 4mm, and the inclination of the groove is 45 degrees.
Then sequentially polishing the grooves by using 800-mesh and 1500-mesh abrasive paper, then putting the substrate into a sodium hydroxide aqueous solution for cleaning to remove surface oxides, then adopting a nitric acid aqueous solution for neutralization, washing by using clear water, and then putting the substrate into a vacuum drying oven for drying for 30min at 100 ℃;
(2) laser cladding repair: putting Al-Mg-Sc-Zr powder prepared by gas atomization into an oven at 150 ℃ for drying for 2 hours, and then putting the powder into a vacuum bag for later use;
the water cooling unit is provided with: connecting the water inlet and the water outlet with a water cooling unit by using water pipes, then adding cooling water into the atmosphere maintaining unit, and starting the water cooling unit to ensure normal circulation of the cooling water;
placing the substrate into an atmosphere maintaining unit to ensure that the liquid level does not enter the groove below the groove of the substrate, connecting an air inlet and an argon bottle by using an air pipe, and opening a valve to introduce argon;
introducing argon for 10min, then filling dried Al-Mg-Sc-Zr powder into a powder feeder, and setting the following process parameters: laser power 1600W, scanning speed 600mm/min, powder feeder rotational speed 1.2r/min, overlap ratio 60%, in order to guarantee to fill up the recess simultaneously, print the model according to 1: 1.1, amplifying the groove, and then starting to carry out laser cladding repair on the groove;
(3) and (3) low-temperature aging treatment: after the laser cladding repair is finished, putting the substrate into a muffle furnace for aging treatment at 120 ℃ for 18 h;
and (3) testing mechanical properties:
cutting a tensile sample and a metallographic sample from the substrate processed in the step (3) by linear cutting, carrying out tensile test after the tensile sample is ground and polished, and carrying out hardness test after the metallographic sample is ground and polished;
the test position is in the direction of the vertical surface of the groove, the test load is 0.1kg, and points are arranged on the repair interface at intervals of 0.2 mm;
the tensile test results show that: the tensile strength of the laser cladding repaired tensile sample subjected to online cooling and low-temperature aging treatment is 283Pa, the elongation is 8.9 percent, and the test hardness value is 78-95HVThe problem of performance softening is solved, and the use requirement is met.
Example 3:
the embodiment provides an online cooling and heat treatment method for repairing heat-treatable aluminum alloy based on laser cladding, which comprises the following steps:
(1) pretreatment: A6061-T6 aluminum alloy plate with the length, width and height of 150mm, 100mm and 15mm is provided with 1 through groove by adopting linear cutting, the upper width of the groove is 9mm, the lower width of the groove is 1mm, the depth of the groove is 4mm, and the inclination of the groove is 45 degrees.
Then sequentially polishing the grooves by using 800-mesh and 1500-mesh abrasive paper, then putting the substrate into a sodium hydroxide aqueous solution for cleaning to remove surface oxides, then adopting a nitric acid aqueous solution for neutralization, washing by using clear water, and then putting the substrate into a vacuum drying oven for drying for 30min at 100 ℃;
(2) laser cladding repair: putting Al-Mg-Sc-Zr powder prepared by gas atomization into an oven at 150 ℃ for drying for 2 hours, and then putting the powder into a vacuum bag for later use;
the water cooling unit is provided with: connecting the water inlet and the water outlet with a water cooling unit by using water pipes, then adding cooling water into the atmosphere maintaining unit, and starting the water cooling unit to ensure normal circulation of the cooling water;
placing the substrate into an atmosphere maintaining unit to ensure that the liquid level does not enter the groove below the groove of the substrate, connecting an air inlet and an argon bottle by using an air pipe, and opening a valve to introduce argon;
introducing argon for 10min, then filling dried Al-Mg-Sc-Zr powder into a powder feeder, and setting the following process parameters: laser power 1600W, scanning speed 600mm/min, powder feeder rotational speed 1.2r/min, overlap ratio 60%, in order to guarantee to fill up the recess simultaneously, print the model according to 1: 1.1, amplifying the groove, and then starting to carry out laser cladding repair on the groove;
(3) and (3) low-temperature aging treatment: after the laser cladding repair is finished, putting the substrate into a muffle furnace for aging treatment at 180 ℃ for 12 h;
and (3) testing mechanical properties:
cutting a tensile sample and a metallographic sample from the substrate processed in the step (3) by linear cutting, carrying out tensile test after the tensile sample is ground and polished, and carrying out hardness test after the metallographic sample is ground and polished;
the test position is in the direction of the vertical surface of the groove, the test load is 0.1kg, and points are arranged on the repair interface at intervals of 0.2 mm;
the tensile test results show that: through on-line cooling and low-temperature agingThe tensile strength of the treated tensile sample after laser cladding repair is 286Pa, the elongation is 8.5 percent, and the test hardness value is 76-93HVThe problem of performance softening is solved, and the use requirement is met.
Comparative example 1 (No in-line Cooling and Heat treatment)
The embodiment provides an online cooling and heat treatment method for repairing heat-treatable aluminum alloy based on laser cladding, which comprises the following steps:
(1) pretreatment: A6061-T6 aluminum alloy plate with the length, width and height of 150mm, 100mm and 15mm is provided with 1 through groove by adopting linear cutting, the upper width of the groove is 9mm, the lower width of the groove is 1mm, the depth of the groove is 4mm, and the inclination of the groove is 45 degrees.
Then sequentially polishing the grooves by using 800-mesh and 1500-mesh abrasive paper, then putting the substrate into a sodium hydroxide aqueous solution for cleaning to remove surface oxides, then adopting a nitric acid aqueous solution for neutralization, washing by using clear water, and then putting the substrate into a vacuum drying oven for drying for 30min at 100 ℃;
(2) laser cladding repair: putting Al-Mg-Sc-Zr powder prepared by gas atomization into an oven at 150 ℃ for drying for 2 hours, and then putting the powder into a vacuum bag for later use;
placing the substrate into an atmosphere maintaining unit, connecting an air inlet and an argon bottle by using an air pipe, and opening a valve to introduce argon;
introducing argon for 5min, then filling dried Al-Mg-Sc-Zr powder into a powder feeder, and setting the following process parameters: laser power 1600W, scanning speed 600mm/min, powder feeder rotational speed 1.2r/min, overlap ratio 60%, in order to guarantee to fill up the recess simultaneously, print the model according to 1: 1.1 amplifying the groove, and then beginning to carry out laser cladding repair on the groove.
And (3) testing mechanical properties:
after the laser cladding repair is finished, cutting off a tensile sample and a metallographic sample from the substrate by using linear cutting, carrying out tensile test after the tensile sample is ground and polished, and carrying out hardness test after the metallographic sample is ground and polished;
the test position is in the direction of the vertical surface of the groove, the test load is 0.1kg, and points are arranged on the repair interface at intervals of 0.2 mm;
the tensile test results show that: the tensile strength of the repaired tensile sample is 170Pa, the elongation is 8.6%, the performance is greatly reduced, and the softening is obvious.
The hardness test results are shown in FIG. 3.
Comparative example 2: (Cooling only in-line, not heat treated)
The embodiment provides an online cooling and heat treatment method for repairing heat-treatable aluminum alloy based on laser cladding, which comprises the following steps:
(1) pretreatment: A6061-T6 aluminum alloy plate with the length, width and height of 150mm, 100mm and 15mm is provided with 1 through groove by adopting linear cutting, the upper width of the groove is 9mm, the lower width of the groove is 1mm, the depth of the groove is 4mm, and the inclination of the groove is 45 degrees.
Then sequentially polishing the grooves by using 800-mesh and 1500-mesh abrasive paper, then putting the substrate into a sodium hydroxide aqueous solution for cleaning to remove surface oxides, then adopting a nitric acid aqueous solution for neutralization, washing by using clear water, and then putting the substrate into a vacuum drying oven for drying for 30min at 100 ℃;
(2) laser cladding repair: putting Al-Mg-Sc-Zr powder prepared by gas atomization into an oven at 150 ℃ for drying for 2 hours, and then putting the powder into a vacuum bag for later use;
the water cooling unit is provided with: as shown in fig. 1, a water inlet and a water outlet are connected with a water cooling unit by using water pipes, then cooling water is added into an atmosphere maintaining unit, and the water cooling unit is started to ensure normal circulation of the cooling water, so that online cooling is realized;
placing the substrate into an atmosphere maintaining unit to ensure that the liquid level does not enter the groove below the groove of the substrate, connecting an air inlet and an argon bottle by using an air pipe, and opening a valve to introduce argon;
introducing argon for 5min, then filling dried Al-Mg-Sc-Zr powder into a powder feeder, and setting the following process parameters: laser power 1600W, scanning speed 600mm/min, powder feeder rotational speed 1.2r/min, overlap ratio 60%, in order to guarantee to fill up the recess simultaneously, print the model according to 1: 1.1 amplifying the groove, and then beginning to carry out laser cladding repair on the groove.
And (3) testing mechanical properties:
after the laser cladding repair is finished, cutting off a tensile sample and a metallographic specimen from the substrate by linear cutting, and performing tensile test after the tensile sample is ground and polished; carrying out hardness test after grinding and polishing the metallographic specimen;
the test position is in the direction of the vertical surface of the groove, the test load is 0.1kg, and points are arranged on the repair interface at intervals of 0.2 mm;
the tensile test results show that: the tensile strength of the tensile sample after laser cladding repair only by adopting an online cooling mode is 205Pa, the elongation is 7.9 percent, the performance softening problem is improved to a certain extent, but the use requirement cannot be met;
the hardness test results are shown in FIG. 3.
Comparative example 3: (in-line cooling and heat treatment, but cooling by indirect contact)
The embodiment provides an online cooling and heat treatment method for repairing heat-treatable aluminum alloy based on laser cladding, which comprises the following steps:
(1) pretreatment: A6061-T6 aluminum alloy plate with the length, width and height of 150mm, 100mm and 15mm is provided with 1 through groove by adopting linear cutting, the upper width of the groove is 9mm, the lower width of the groove is 1mm, the depth of the groove is 4mm, and the inclination of the groove is 45 degrees.
Then sequentially polishing the grooves by using 800-mesh and 1500-mesh abrasive paper, then putting the substrate into a sodium hydroxide aqueous solution for cleaning to remove surface oxides, then adopting a nitric acid aqueous solution for neutralization, washing by using clear water, and then putting the substrate into a vacuum drying oven for drying for 30min at 100 ℃;
(2) laser cladding repair: putting Al-Mg-Sc-Zr powder prepared by gas atomization into an oven at 150 ℃ for drying for 2 hours, and then putting the powder into a vacuum bag for later use;
the water cooling unit is provided with: the water cooling plate is connected with the water cooling unit through a water pipe, and the water cooling unit is started to ensure that cooling water is normally circulated in the water cooling plate;
placing the substrate on a water-cooling plate, ensuring that the bottom surface of the substrate is in contact with the water-cooling plate, connecting an air inlet and an argon bottle by using an air pipe, and opening a valve to introduce argon;
introducing argon for 10min, then filling dried Al-Mg-Sc-Zr powder into a powder feeder, and setting the following process parameters: laser power 1600W, scanning speed 600mm/min, powder feeder rotational speed 1.2r/min, overlap ratio 60%, in order to guarantee to fill up the recess simultaneously, print the model according to 1: 1.1 amplifying the groove, and then starting laser cladding repair on the groove;
(3) and (3) low-temperature aging treatment: after the laser cladding repair is finished, putting the substrate into a muffle furnace for aging treatment at 150 ℃ for 15 h;
and (3) testing mechanical properties:
cutting a tensile sample and a metallographic sample from the substrate processed in the step (3) by linear cutting, carrying out tensile test after the tensile sample is ground and polished, and carrying out hardness test after the metallographic sample is ground and polished;
the test position is in the direction of the vertical surface of the groove, the test load is 0.1kg, and points are arranged on the repair interface at intervals of 0.2 mm;
the tensile test results show that: although on-line cooling and low-temperature aging treatment are adopted, the cooling mode is indirect contact cooling, the cooling speed is low, the tensile strength of the tensile sample after laser cladding repair is 203Pa, the elongation is 9.1 percent, the performance softening problem is improved to a certain extent, and the use requirement cannot be met.
In conclusion, the test results of the aluminum alloy samples obtained by comparing the examples 1-3 with the comparative examples 1-3 show that the 6061-T6 aluminum alloy obtained by the laser cladding repair method has the tensile strength of about 290MPa and the hardness of more than 80HV, and meets the service requirements of rail transit; the implementation device of the method is simple and convenient to use; and moreover, high-temperature solid solution is not needed during subsequent heat treatment, so that the problem of thermal deformation of vehicle body parts at high temperature is avoided.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The method for treating the aluminum alloy comprises the step of carrying out laser cladding repair on an aluminum alloy substrate, and is characterized in that online cooling is carried out in the laser cladding repair process.
2. The process of claim 1, wherein the in-line cooling is achieved by a cooling device;
the cooling device includes: the device comprises an atmosphere maintaining unit, a water cooling unit and a gas supply unit;
the top of the atmosphere maintaining unit is semi-open;
the water cooling unit is respectively connected with a water inlet pipeline and a water outlet pipeline of the atmosphere maintaining unit;
the gas supply device is connected with a gas inlet pipeline of the atmosphere maintaining unit.
3. The treatment method according to claim 2, wherein the flow rate and temperature of the cooling water in the atmosphere maintaining unit are controlled to be constant.
4. The treatment method according to claim 3, wherein a protective atmosphere is maintained above the aluminum alloy substrate in the atmosphere maintaining unit.
5. The treatment method according to claim 4, wherein the aluminum alloy substrate is 6061-T6 aluminum alloy.
6. The process of claim 5, wherein the repair material for laser cladding repair is Al-Mg-Sc-Zr powder.
7. The process of claim 6, wherein said 6061-T6 aluminum alloy substrate is pre-treated to form a groove prior to said laser cladding repair; and when the laser cladding repair is carried out, the liquid level is ensured to be below the substrate groove.
8. The process of claim 7, wherein the laser cladding is performedThe composite process parameters are as follows: laser power is 1400-1800W, scanning speed is 600-800mm/min, and powder feeding speed is 1000-2200mm3Min, interlaminar lapping rate of 55-85% and gas flow of 5-10L/min.
9. The treatment method according to any one of claims 1 to 8, wherein the aluminum alloy substrate is subjected to low-temperature aging treatment after the laser cladding repair is completed.
10. The treatment method according to claim 9, characterized in that the conditions of the low temperature ageing treatment are: aging for 12-18 h at 120-180 ℃, and air cooling.
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| CN108411227A (en) * | 2018-01-30 | 2018-08-17 | 华南理工大学 | A kind of crystal whisker toughened processing method of surface micro-structure |
| US20190240716A1 (en) * | 2018-02-08 | 2019-08-08 | Shijian YUAN | Frozen forming method for large tailored plate aluminum alloy component |
| CN111172529A (en) * | 2018-11-13 | 2020-05-19 | 中国科学院沈阳自动化研究所 | Defect control method for cast aluminum alloy structural member in laser coaxial powder feeding repair process |
| CN210916257U (en) * | 2019-11-15 | 2020-07-03 | 株洲辉锐增材制造技术有限公司 | Bearing device for laser cladding plane product and laser cladding system |
| CN111408840A (en) * | 2020-04-07 | 2020-07-14 | 哈尔滨工业大学（威海） | Device for assisting underwater laser deposition or material increase through induction heating and use method |
| CN112809183A (en) * | 2021-03-15 | 2021-05-18 | 中国人民解放军空军工程大学 | Additive manufacturing metal cooling method |
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2022
- 2022-01-29 CN CN202210112891.4A patent/CN114507854A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108411227A (en) * | 2018-01-30 | 2018-08-17 | 华南理工大学 | A kind of crystal whisker toughened processing method of surface micro-structure |
| US20190240716A1 (en) * | 2018-02-08 | 2019-08-08 | Shijian YUAN | Frozen forming method for large tailored plate aluminum alloy component |
| CN111172529A (en) * | 2018-11-13 | 2020-05-19 | 中国科学院沈阳自动化研究所 | Defect control method for cast aluminum alloy structural member in laser coaxial powder feeding repair process |
| CN210916257U (en) * | 2019-11-15 | 2020-07-03 | 株洲辉锐增材制造技术有限公司 | Bearing device for laser cladding plane product and laser cladding system |
| CN111408840A (en) * | 2020-04-07 | 2020-07-14 | 哈尔滨工业大学（威海） | Device for assisting underwater laser deposition or material increase through induction heating and use method |
| CN112809183A (en) * | 2021-03-15 | 2021-05-18 | 中国人民解放军空军工程大学 | Additive manufacturing metal cooling method |
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