CN117564448A - Additive manufacturing superalloy product defect repairing method - Google Patents
Additive manufacturing superalloy product defect repairing method Download PDFInfo
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- CN117564448A CN117564448A CN202410007378.8A CN202410007378A CN117564448A CN 117564448 A CN117564448 A CN 117564448A CN 202410007378 A CN202410007378 A CN 202410007378A CN 117564448 A CN117564448 A CN 117564448A
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- 239000000654 additive Substances 0.000 title claims abstract description 49
- 230000000996 additive effect Effects 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 40
- 230000007547 defect Effects 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910000601 superalloy Inorganic materials 0.000 title claims description 25
- 238000003466 welding Methods 0.000 claims abstract description 105
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 23
- 239000000956 alloy Substances 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000005498 polishing Methods 0.000 claims abstract description 12
- 238000001917 fluorescence detection Methods 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 238000003754 machining Methods 0.000 claims abstract description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 15
- 229910052786 argon Inorganic materials 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/0096—Portable laser equipment, e.g. hand-held laser apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/34—Laser welding for purposes other than joining
- B23K26/342—Build-up welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention relates to a method for repairing the shortage of a high-temperature alloy product in additive manufacturing, belongs to the field of repairing the high-temperature alloy product in additive manufacturing, and solves the problem that a high-precision thin-wall area of the high-temperature alloy is difficult to repair in the prior art. A method for repairing the shortage of a high-temperature alloy product in additive manufacturing comprises the following steps: s1, carrying out three-dimensional scanning and comparison on an additive manufactured product, and confirming product shortage areas and thickness characteristics; s2, mechanically polishing and cleaning the defect area; s3, filling and repair welding is carried out on the shortage area by adopting a handheld laser device and a welding wire, and the shortage is repaired; s4, performing X-ray detection on the repair position; s5, carrying out heat treatment on the repair welded product; s6, machining the residual height of repair welding; s7, performing fluorescence detection on the repair position. The repair of the high-precision thin-wall structure additive manufacturing structural member is realized, and the generation of crack defects after repair welding is effectively improved.
Description
Technical Field
The invention relates to the field of repair of high-temperature alloy additive manufactured products, in particular to a method for repairing the shortage of the additive manufactured high-temperature alloy products.
Background
With the development of industry, high-performance materials are widely adopted, the development equipment period is obviously shortened, the development cost needs to be strictly controlled, and higher requirements and challenges are certainly provided for manufacturing technical means.
If a cabin in a certain product adopts GH99 alloy for material-increasing manufacturing process, the requirement on the shape surface precision of a structural member is high, and the defects of shrinkage porosity, inclusion and the like are easy to generate in the prior art; if a forging machine is adopted, a large-tonnage press is required for die forging, the service lives of the parts such as a die, a workbench and the like are extremely shortened due to high temperature, the manufacturing cost of a single part is greatly improved, the expensive metal material with high mechanical property such as GH99 alloy is seriously damaged by a cutter, the machining difficulty is high, the period is long, the material utilization rate is low, and the manufacturing cost is greatly increased. The traditional manufacturing technology is difficult to finish the manufacturing of the structural member with high efficiency and low cost. The additive manufacturing technology is based on the discrete-stacking principle, melts the metal material layer by layer through a given heat source, deposits and grows, and directly forms a high-performance structural member by a three-dimensional model in a near-net manner, thereby being an important direction for advanced manufacturing and development of the structural member in the future.
However, in the additive manufacturing process of complex thin-wall structural members, the support structure is easy to be restrained undesirably, so that the phenomena of product deformation, dent and other defects are caused, the traditional repair welding method mostly adopts manual argon arc welding, after repair welding and heat treatment, crack defects are extremely easy to occur, and the traditional repair welding method is only used for repair welding of large-wall-thickness areas with the wall thickness exceeding 1mm or high-strength areas with the inside supported by reinforcing ribs, and the thin-wall areas with the wall thickness less than 1mm and without an internal support structure are difficult to avoid crack generation, so that the popularization of the additive manufacturing technology to the field of complex high-precision high-temperature alloys is severely restricted.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method for repairing the shortage of a high-temperature alloy product in additive manufacturing, which can realize the repair of a structural member in additive manufacturing with a high-precision thin-wall structure and effectively improve the generation of crack defects after repair welding.
The embodiment of the invention provides a method for repairing the shortage of an additive manufactured superalloy product, which comprises the following steps:
s1, carrying out three-dimensional scanning on an additive manufactured product, comparing the additive manufactured product with a three-dimensional theoretical model, and confirming the product shortage area and thickness characteristics;
s2, mechanically polishing and cleaning the defect area;
s3, filling and repair welding is carried out on the shortage area by adopting a handheld laser device and a welding wire, and the shortage is repaired;
s4, performing X-ray detection on the repair position;
s5, carrying out heat treatment on the repair welded product;
s6, machining the residual height of repair welding;
s7, performing fluorescence detection on the repair position.
The additive manufacturing high-temperature alloy product is of a thin-wall hollow sandwich structure, the thickness of a thin-wall area is less than or equal to 1mm, and the shortage position of the product is the outer surface of the product.
Specifically, the thickness of the product shortage area in the step S1 is characterized by being concave, and the degree of the concave is larger than 0.3mm from the theoretical model.
Illustratively, the repair welding position thickness after repairing the product shortage area in the step S3 is larger than the body thickness.
Further, the product material is GH99, and the welding wire material is GH4099.
Specifically, in the step S3, the handheld laser device is fiber laser, the power is 1200W-1500W, welding operators fill wires manually, the laser swing frequency is 50HZ, and the swing amplitude is 2.5mm.
Preferably, the shielding gas of the handheld laser device in step S3 is argon, and the air flow is 20L/min-25L/min.
Further, the heat treatment temperature of the repair welded product in the step S5 is 750-760 ℃ and the time period is 8-9 hours.
Specifically, the room temperature strength of the repair welding position reaches 1100MPa, the high temperature strength of 700 ℃ reaches 630MPa, and the high temperature strength of 900 ℃ reaches 380MPa.
Preferably, the diameter of the welding wire in the step S3 is 1.2mm.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1. for the defect repair of the additive manufacturing superalloy product with the thin-wall hollow sandwich structure, the thickness of the thin-wall area is less than or equal to 1mm, the invention adopts the small-power handheld laser device, is flexible and efficient, and the welding operator manually fills wires, intermittently inputs and manually controls a laser heat source, so that the welding quality is ensured, the welding heat input is reduced to the greatest extent, the filling quantity of welding wires is reduced, the welding deformation is reduced, and the occurrence of weld cracks is effectively avoided.
2. According to the invention, after repair welding of the GH99 high-temperature alloy thin-wall structure, heat treatment is carried out for 8 hours at 750-760 ℃, so that the welding stress is effectively eliminated, and the occurrence of cracks at the welding seam position is avoided.
3. The high-temperature alloy product is manufactured by processing the additive by adopting the defect repairing method, the internal quality and the external quality of the welding seam are respectively detected by X-ray detection and fluorescence detection, the welding seam is defect-free, the tensile strength is detected, the room temperature strength reaches 1100MPa, the high temperature strength at 700 ℃ reaches 630MPa, and the high temperature strength at 900 ℃ reaches 380MPa.
4. The defect repairing method of the invention realizes high-quality quick repair for high-precision, small-wall-thickness and easily-deformed products for additive manufacturing of high-temperature alloy products, fills up the gap of defect repair of high-precision thin-wall high-temperature alloy products, avoids direct scrapping of high-precision products due to local defects after additive manufacturing, and greatly reduces the manufacturing cost of high-precision thin-wall high-temperature alloy products.
In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is a schematic diagram of repair welding of a hand-held laser device according to the present invention
FIG. 2a is a schematic view of the appearance of a high-precision thin-wall structure of a superalloy;
FIG. 2b is a perspective view of the profile of a superalloy high-precision thin-wall structure;
FIG. 3 is a cut-away view of a high-precision thin-wall structure of a superalloy;
FIG. 4a is a photograph of a superalloy high-precision thin-wall structure before repair;
FIG. 4b is a photograph of a superalloy after repair of a high precision thin wall structure;
FIG. 5a is a photograph of a microstructure of a superalloy prior to repair of a high-precision thin-wall structure;
FIG. 5b is a photograph of the microstructure of the superalloy after repair of the high precision thin wall structure of FIG. 5 a;
FIG. 6a is a photograph of a thin wall structure of example 1 after repair polishing;
fig. 6b is a photograph of comparative example 2 after repair polishing of a thin-walled structure.
Reference numerals:
10-a handheld laser device; 20-welding wires; 30-a product body; 40-product recessed surface defect area; 50-repair welding the filling material.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.
For complex thin-wall structural members in the additive manufacturing process, the phenomena of support structure restriction is not ideal, product deformation, dent and other defects are caused easily, manual argon arc welding is mostly adopted in the traditional repair welding method, after repair welding and heat treatment, crack defects are extremely easy to occur, the traditional repair welding method is only used for repair welding of large-wall-thickness areas with wall thickness exceeding 1mm or high-strength areas with reinforcing ribs inside for supporting, and crack generation is difficult to avoid for thin-wall areas with wall thickness less than 1mm and without internal support structures, so that popularization of additive manufacturing technology to the field of complex high-precision high-temperature alloys is severely restricted.
In order to realize repair of a high-precision thin-wall structure additive manufacturing structural member and effectively improve generation of repair welded crack defects, one specific embodiment of the invention discloses a method for repairing a defect of an additive manufacturing superalloy product, which comprises the following steps:
s1, carrying out three-dimensional scanning on an additive manufactured product, comparing the additive manufactured product with a three-dimensional theoretical model, and confirming the product shortage area and thickness characteristics;
s2, mechanically polishing and cleaning the defect area;
s3, filling and repair welding is carried out on the shortage area by adopting a handheld laser device and a welding wire, and the shortage is repaired;
s4, performing X-ray detection on the repair position;
s5, carrying out heat treatment on the repair welded product;
s6, machining the residual height of repair welding;
s7, performing fluorescence detection on the repair position.
The additive manufacturing superalloy product is of a thin-wall hollow sandwich structure, the thickness of a thin-wall area is less than or equal to 1mm, the shortage position of the product is the outer surface of the product, and the accessibility of repair welding operation space is good.
For the defect repair of the additive manufacturing superalloy product with the thin-wall hollow sandwich structure, the thickness of the thin-wall area is less than or equal to 1mm, the invention adopts the small-power handheld laser device, is flexible and efficient, and the welding operator manually fills wires, intermittently inputs and manually controls a laser heat source, so that the welding quality is ensured, the welding heat input is reduced to the greatest extent, the filling quantity of welding wires is reduced, the welding deformation is reduced, and the occurrence of weld cracks is effectively avoided.
Specifically, the thickness of the product shortage area in the step S1 is characterized by being concave, and the degree of the concave is larger than 0.3mm from the theoretical model.
Further, step S2, mechanically polishing and cleaning the surface of the shortage area before repair welding operation, and wiping with alcohol to remove an oxide film and oil stains on the surface of the area to be repaired so as to prevent air holes and slag inclusion after repair welding.
Illustratively, the product material is GH99, the wire material is GH4099, and the wire diameter is 1.2mm.
Specifically, in the step S3, the handheld laser equipment is fiber laser, the power is 1200W-1500W, welding operators fill wires manually, the laser swing frequency is 50HZ, and the swing amplitude is 2.5mm; the welding process parameters are obtained through welding feasibility verification according to the material and the wall thickness of the product.
Further, continuous laser power is adopted in the welding process, so that the welding seam strength is high and the surface is well formed.
Preferably, the shielding gas of the handheld laser device in step S3 is argon, and the air flow is 20L/min-25L/min.
Further, the thickness of the repair welding position after repairing the product shortage area in the step S3 is larger than the thickness of the body.
In one possible design, the thickness of the thin-walled product body is 1mm, the repair is performed by using a handheld laser device, the repair welding is stopped after the thickness of the visual inspection repair welding position is higher than the surface of the base material body, and the thickness of the repair welding position is larger than 1mm.
Step S4, detecting the repairing position by X-ray, and detecting whether air holes and unfused defects exist in the welding line; if the weld joint has defects, digging and discharging are needed, and then repair welding is carried out; and the qualified welding seams are ensured before heat treatment, repeated heat treatment is avoided, and the cost is reduced.
Further, the step S5 is to heat treat the whole product after repair welding at 750-760 ℃ for 8-9 hours; the heat treatment is followed by furnace cooling to room temperature.
The hand-held laser repair welding is adopted, so that the welding wire melting and the welding seam filling can be completed with smaller heat input, the internal stress of the welding seam is effectively reduced, and simultaneously, through heat treatment, fine strengthening phases can be separated out from austenite grains of the alloy, thereby improving the room temperature and high temperature strength of the alloy, the structure of a repair welding area is austenite plus a dispersion compound, and the separation strengthening phases are VC and Ni 3 Al、Ni 3 Ti、Ni 3 (Al·Ti)。
Machining the residual height of repair welding after cooling, wherein an assembling surface is machined by a machine tool, a non-assembling surface is polished in a smooth transition mode by an angle grinder, wall thickness is measured by a wall thickness meter in the polishing process, polishing is stopped after the thickness of a product body is reached, and the product body is compared with a design model again by adopting three-dimensional scanning, so that no recess exists on the outer surface of the product; the polished product has a flat surface, so that the surface crack defect can be observed conveniently in the subsequent fluorescence detection process.
Further, carrying out fluorescence detection on the processed product to detect whether microcracks exist on the surface of the product; the microcracks are scale patterns.
Compared with the prior art, the repairing method for the high-precision thin-wall structure additive manufacturing structural part can realize high-quality and low-cost rapid repairing for high-precision, small-wall-thickness and easily-deformed product additive manufacturing superalloy products.
The internal quality and the external quality of the welding seam are respectively detected by X-ray detection and fluorescence detection, the welding seam is defect-free, the tensile strength is detected, the room temperature strength reaches 1100MPa, the high temperature strength at 700 ℃ reaches 630MPa, and the high temperature strength at 900 ℃ reaches 380MPa.
The repairing effect of the invention in the aspect of repairing the high-precision thin-wall structure additive manufacturing defect is achieved by combining a specific embodiment.
The hand-held laser device model used in the examples was (FCA 1500).
Example 1
As shown in fig. 2, the high-precision thin-wall structure is a high-temperature alloy product manufactured by additive, the main body of the high-temperature alloy product is a thin-wall hollow structure, after the support is removed, the surface defect area of the product is characterized by a dent, and the deviation between the dent and a theoretical model is more than 0.3mm; the product shortage position is positioned on the outer surface of the product, and the repair welding operation space has good accessibility.
The product material is GH99, the welding wire material is GH4099, and the wall thickness of the product body is 1mm.
The specific repairing process is as follows:
s1, firstly, carrying out three-dimensional scanning on the outer surface of an additive manufactured product by adopting a tracking three-dimensional scanner, comparing the three-dimensional scanning with a three-dimensional design model, and confirming and marking a region with the outer surface depression of more than 0.3mm compared with a theoretical model;
s2, then, treating the surface of the area to be repaired: mechanically polishing and cleaning the defect area by adopting a clean steel wire brush to ensure that the defect area leaks out of metallic luster, and wiping the surface by using absolute ethyl alcohol;
s3, selecting a welding wire with the diameter of 1.2mm according to the wall thickness of the product; filling and repair welding is carried out on the shortage position by adopting a handheld laser device and a welding wire;
according to the material quality and the wall thickness of the product, through welding feasibility verification, the welding parameters are determined as follows: the laser power is 1200W-1500W, the welding operator manually fills wires, the laser swing frequency is 50HZ, and the swing amplitude is 2.5mm; the shielding gas of the hand-held laser is argon, and the gas flow is 20L/min-25L/min;
stopping repair welding after the visual inspection of the concave area completely covers and is higher than the surface of the body;
s4, performing X-ray detection on the repair position after repair welding is finished, and detecting whether air holes and unfused defects exist in the welding line; if the detection is unqualified, digging and re-repairing welding are needed to be carried out on the weld defect position, and the repair welding qualification rate is more than 98%; if the detection is qualified, carrying out heat treatment on the product;
s5, carrying out heat treatment on the product, wherein the heat treatment temperature is 750-760 ℃ for 8 hours; internal stress is eliminated, and the mechanical property of the product is improved;
s6, carrying out smooth transition polishing on the residual height of repair welding by adopting an angle grinder; in the polishing process, the wall thickness is measured through a wall thickness meter, polishing is stopped after the thickness of the product body is reached, and three-dimensional scanning is adopted to compare with a design model again, so that no recess exists on the outer surface of the product;
and S7, performing fluorescence detection on the repair position, and if the surface has no crack, completing repair, wherein the one-time repair qualification rate reaches 100%.
The appearances of the product before and after repair are shown in figure 4, the microstructures of the product before and after repair are shown in figure 5, the tensile strength is detected, the room temperature strength reaches 1100MPa, the high temperature strength at 700 ℃ reaches 630MPa, and the high temperature strength at 900 ℃ reaches 380MPa.
Comparative example 1
Aiming at welding test plates 1-1, 1-1 and 1-3 of high-temperature alloy manufactured by additive materials with the thickness of 1mm, the material is GH99, pits with the depth of 0.3-0.5 mm are machined on the surface, hand-held laser welding repair welding is carried out by adopting the method of the embodiment 1, and the welding seam is polished to be smooth after repair welding; the test pieces were subjected to mechanical property detection without heat treatment, and the detection results are shown in table 1.
Table 1 comparative example 1 welded test panels and test results of mechanical properties after repair welding of example 1
As can be seen from Table 1, the strength of the sample not reinforced by heat treatment is significantly different from that of the sample reinforced by heat treatment, and the reinforced phase is precipitated in the austenite grains during heat treatment, so that the room temperature performance and the high temperature performance of the sample can be significantly improved.
Comparative example 2
For the same product as in example 1, manual argon arc welding was used to repair weld the concave position, the welding current was 40-50A, the tungsten electrode diameter was 2.0mm, the welding wire diameter was 1.2mm, and the argon flow was 10L/min.
After welding, the deformation of the thin wall position is serious because of larger argon arc welding heat input; and meanwhile, the welding line is qualified in X-ray detection, and after heat treatment, the welding line is polished, and the microcracks are found to be visible visually.
The photographs of repair welding positions of the products obtained after repair welding and heat treatment and polishing of the example 1 and the comparative example 2 are shown in fig. 6, and it can be seen that the surface of the product obtained by repair welding and heat treatment of the method of the invention has no cracks after repair of the defect of the invention in the example 1, and the cracks of the product obtained by the comparative example 2 are obvious by adopting a traditional repair method.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The method for repairing the shortage of the high-temperature alloy product in additive manufacturing is characterized by comprising the following steps of:
s1, carrying out three-dimensional scanning on an additive manufactured product, comparing the additive manufactured product with a three-dimensional theoretical model, and confirming the product shortage area and thickness characteristics;
s2, mechanically polishing and cleaning the defect area;
s3, filling and repair welding is carried out on the shortage area by adopting a handheld laser device and a welding wire, and the shortage is repaired;
s4, performing X-ray detection on the repair position;
s5, carrying out heat treatment on the repair welded product;
s6, machining the residual height of repair welding;
s7, performing fluorescence detection on the repair position.
2. The additive manufacturing superalloy product shortage repairing method according to claim 1, wherein the additive manufacturing superalloy product is of a thin-wall hollow sandwich structure, the thickness of a thin-wall area is less than or equal to 1mm, and the shortage position of the product is the outer surface of the product.
3. The additive manufacturing superalloy product defect repair method according to claim 1, wherein the product defect area in step S1 is characterized by a dent, and the dent is deviated from the theoretical model by more than 0.3mm.
4. The additive manufacturing superalloy product defect repair method according to claim 2, wherein the repair welding location thickness after repair of the defect area of the product in step S3 is greater than the body thickness.
5. The additive manufacturing superalloy product fault restoration method according to claim 1, wherein the product material is GH99 and the wire material is GH4099.
6. The method for repairing the shortage of the additive manufactured superalloy product according to claim 5, wherein in the step S3, the handheld laser device is fiber laser, the power is 1200W-1500W, a welding operator manually fills wires, the laser swing frequency is 50HZ, and the swing amplitude is 2.5mm.
7. The method for repairing the shortage of the additive manufactured superalloy product according to claim 6, wherein the shielding gas of the handheld laser device in the step S3 is argon gas, and the gas flow is 20L/min-25L/min.
8. The additive manufacturing superalloy product defect repair method according to claim 1, wherein the post repair welding product heat treatment temperature in step S5 is 750-760 ℃ for 8-9 hours.
9. The method for repairing the shortage of additive manufactured superalloy products according to claim 1, wherein the repair welding position has a room temperature strength of 1100MPa, a high temperature strength of 630MPa at 700 ℃ and a high temperature strength of 380MPa at 900 ℃.
10. The additive manufacturing superalloy product defect repair method of claim 1, wherein the wire diameter of step S3 is 1.2mm.
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| CN202410007378.8A CN117564448A (en) | 2024-01-03 | 2024-01-03 | Additive manufacturing superalloy product defect repairing method |
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