CN113634870A - GH4169 alloy vacuum thermal deformation connection method - Google Patents
GH4169 alloy vacuum thermal deformation connection method Download PDFInfo
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- CN113634870A CN113634870A CN202110772814.7A CN202110772814A CN113634870A CN 113634870 A CN113634870 A CN 113634870A CN 202110772814 A CN202110772814 A CN 202110772814A CN 113634870 A CN113634870 A CN 113634870A
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- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
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- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
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Abstract
The invention relates to the technical field of connection of metal materials, in particular to a GH4169 alloy vacuum thermal deformation connection method. Firstly, sanding and pickling the to-be-welded surfaces of GH4169 alloy, ultrasonically cleaning in alcohol, and then butting and assembling. Then placing the connecting piece in a vacuum deformation connecting device, and vacuumizing the device to be lower than 10 DEG‑ 2And (3) heating at Pa, applying axial pressure to the connecting piece and carrying out axial deformation when the temperature of the connecting piece reaches 1120-1150 ℃, wherein the deformation speed is 0.010-0.015 mm/s, and the deformation is not less than 40%. And (5) after the deformation is finished, releasing the pressure, and cooling to room temperature in air. The welding method can realize GH4169 alloy welding through deformation under vacuum, and has the advantages of high welding efficiency, high joint strength and the like.
Description
Technical Field
The invention relates to the technical field of connection of metal materials, in particular to a GH4169 alloy vacuum thermal deformation connection method.
Background
GH4169, a typical nickel-based alloy, has the advantages of high strength, high oxidation resistance, high corrosion resistance, high ductility and toughness, excellent fatigue resistance, good weldability, and good workability. Therefore, GH4169 is widely used as a key component of aircraft engines, gas turbines for turbines, and gas turbines for land use. Thermal deformation bonding, an advanced solid state bonding process, is a bonding method that produces significant plastic deformation at the bonding interface through thermal coupling to form a highly reliable metallurgical bond. The process can improve the microstructure performance of the material by plastic deformation, so that the process has the advantages of excellent joint performance, high connection efficiency, short manufacturing period and the like. Compared with the traditional fusion welding process, the connection joint part under the action of plastic deformation does not have a melting area, an as-cast structure can not be formed, metallurgical connection is realized, and the fusion welding defect is avoided. It can therefore be used for the manufacture and repair of a wider range of aerospace components, which brings a new approach to the welding of nickel-based alloys.
Disclosure of Invention
In order to solve the problems of high cost, low efficiency, low joint strength and the like in the traditional diffusion welding process, the invention aims to provide a GH4169 alloy vacuum thermal deformation connecting method which can realize the rapid and efficient welding of GH4169 alloy pieces in vacuum.
The technical scheme of the invention is as follows:
a GH4169 alloy vacuum thermal deformation connection method comprises the following process steps:
1) sanding and pickling surfaces to be welded of GH4169 alloy with sand paper, ultrasonically cleaning in alcohol, and then drying for later use;
2) assembling the surfaces to be welded of the alloy treated in the step 1) in a butt joint mode, placing the alloy in thermal deformation connecting equipment, and vacuumizing the equipment until the vacuum degree is lower than 10-2Pa；
3) Heating the alloy treated in the step 2) to 1120-1150 ℃, wherein the heating rate is 4-6 ℃/s, and the heat preservation time is not more than 30 min;
4) applying axial pressure to the alloy treated in the step 3) and carrying out axial deformation, wherein the deformation speed is 0.010-0.015 mm/s, and the deformation is not less than 40%;
5) unloading the pressure of the alloy treated in the step 4), and cooling the alloy to room temperature.
The GH4169 alloy vacuum thermal deformation connection method comprises the following steps of 2), wherein the vacuum degree of equipment is 10-2～10-4Pa。
According to the GH4169 alloy vacuum thermal deformation connection method, in the step 3), the alloy is heated to 1150 ℃, the heating rate is 5 ℃/s, and the heat preservation time is 5 min.
In the GH4169 alloy vacuum thermal deformation connection method, in the step 3), the deformation speed is 0.012mm/s, and the deformation is 50%.
The design idea of the invention is as follows:
the thermal deformation connecting technology is that under the condition of high temperature, the connecting area is subjected to plastic deformation to promote the metallurgical bonding of the closely contacted welding surfaces. In the deformation connection process, severe plastic deformation will cause Dynamic Recrystallization (DRX) of the deformation zone structure. During the hot deformation connection, dynamic recrystallization nucleation occurs first at the interface region. The recrystallized grains are derived from small-volume substructures generated in the deformed microstructure, the substructures are spontaneously converted into the recrystallized grains under the drive of distortion energy, large-angle grain boundary protrusion occurs in the conversion process, namely, interface grain boundaries move forwards in a bow-out mode, and the drive force of the transformation is the difference of dislocation contents on two sides of the grain boundaries caused by free thermal deformation. This difference is caused by the difference in slip systems during deformation due to the non-uniform orientation of adjacent grains, or by non-uniform deformation near grain boundaries. Along with the development of the bulge, the dislocation content of the part connected with the grain boundary of the bulge is kept unchanged, but the area of the grain boundary is continuously increased, namely the grain boundary can be continuously increased, and the constraint pressure generated by the dislocation structure acting on the concave side of the grain boundary is continuously reduced. Thus, once such a protrusion is formed, it continues to grow until a new equilibrium is reached and evolves into recrystallized grains. And finally realizing the metallurgical bonding of the connecting interface through the nucleation, the growth and the crossing of the recrystallized grains. Under the action of recrystallization behavior, the tissues on the two sides of the connecting joint are completely metallurgically bonded together, and the mechanical property of the alloy matrix is achieved. Therefore, the invention utilizes the recrystallization behavior in the GH4169 thermal deformation process to reasonably select deformation connection parameters, thereby achieving the optimal connection effect.
The invention has the advantages and beneficial effects that:
1. the GH4169 alloy vacuum deformation connection method provided by the invention can realize connection quickly, a good welding joint can be obtained without long-time heat preservation treatment, the connection time is shortened, and the connection efficiency is high.
2. The welding of the GH4169 alloy is realized by deformation under vacuum by adopting the invention, and the performance index range is as follows: after solid solution and aging heat treatment, the tensile strength of the joint at room temperature is more than 1000MPa, and the elongation is more than 12%.
Drawings
FIG. 1 is a schematic view of vacuum hot-deformation connection of GH4169 alloy of the present invention; in the figure, 1 is a vacuum chamber, 2 is a sample holder, and 3 is a sample.
FIG. 2 is a sample of GH4169 alloy after vacuum hot deformation joining.
Detailed Description
As shown in FIG. 1, the vacuum hot deformation connection process of the GH4169 alloy of the invention is as follows: two sample anchor clamps 2 set up in vacuum cavity 1 relatively, and sample 3 is installed to the one end of every sample anchor clamps 2, and two samples 3 set up along the relative coaxial of horizontal direction, wait the face butt joint equipment with two samples 3 through sample anchor clamps 2.
The present invention will be described in further detail below with reference to examples.
Example 1
In the embodiment, the GH4169 alloy is subjected to vacuum deformation connection, and the method comprises the following specific steps:
firstly, sanding and pickling surfaces to be welded of GH4169 alloy with sand paper, ultrasonically cleaning in alcohol, and then drying with cold air for later use;
step two, butting and assembling to-be-welded surfaces of GH4169 alloy, placing the assembled surfaces in deformation connection equipment (a vacuum cavity), and vacuumizing the equipment to 10 DEG-2Pa；
Step three, heating the connecting piece to 1150 ℃, and preserving heat for 5min, wherein the heating rate is 5 ℃/s;
step four, applying axial pressure and carrying out axial deformation after heat preservation is finished, wherein the deformation speed is 0.012mm/s, and the deformation amount is 50%;
and step five, after the deformation connection is finished, unloading the pressure, air-cooling to room temperature, and taking out the connecting piece to realize the GH4169 alloy vacuum deformation connection.
The test results of the deformed and connected joint are as follows: (1) the connecting joint is free of defects, and the bonding rate is high; (2) the tensile strength of the joint at room temperature is 1150MPa, and the elongation is 25%; (3) the long-time heat preservation treatment is not needed in the connection process, and the connection efficiency is high.
Example 2
In the embodiment, the GH4169 alloy is subjected to vacuum deformation connection, and the method comprises the following specific steps:
firstly, sanding and pickling surfaces to be welded of GH4169 alloy with sand paper, ultrasonically cleaning in alcohol, and then drying with cold air for later use;
step two, butting and assembling to-be-welded surfaces of GH4169 alloy, placing the assembled surfaces in deformation connection equipment, and vacuumizing the equipment to 10 DEG-3Pa；
Step three, heating the connecting piece to 1120 ℃, and preserving heat for 15min, wherein the heating rate is 4 ℃/s;
step four, applying axial pressure and carrying out axial deformation after heat preservation is finished, wherein the deformation speed is 0.015mm/s, and the deformation amount is 60%;
and step five, after the deformation connection is finished, unloading the pressure, air-cooling to room temperature, and taking out the connecting piece to realize the GH4169 alloy vacuum deformation connection.
The test results of the deformed and connected joint are as follows: (1) the connecting joint is free of defects, and the bonding rate is high; (2) the tensile strength of the joint at room temperature is 1136MPa, and the elongation is 28 percent; (3) the long-time heat preservation treatment is not needed in the connection process, and the connection efficiency is high.
Example 3
In the embodiment, the GH4169 alloy is subjected to vacuum deformation connection, and the method comprises the following specific steps:
firstly, sanding and pickling surfaces to be welded of GH4169 alloy with sand paper, ultrasonically cleaning in alcohol, and then drying with cold air for later use;
step two, butting and assembling to-be-welded surfaces of GH4169 alloy, placing the assembled surfaces in deformation connection equipment, and vacuumizing the equipment to 10 DEG-4Pa；
Step three, heating the connecting piece to 1130 ℃, and preserving heat for 10min, wherein the heating rate is 6 ℃/s;
step four, applying axial pressure and carrying out axial deformation after heat preservation is finished, wherein the deformation speed is 0.010mm/s, and the deformation amount is 40%;
and step five, after the deformation connection is finished, unloading the pressure, air-cooling to room temperature, and taking out the connecting piece to realize the GH4169 alloy vacuum deformation connection.
The test results of the deformed and connected joint are as follows: (1) the connecting joint is free of defects, and the bonding rate is high; (2) the tensile strength of the joint at room temperature is 1167MPa, and the elongation is 23%; (3) the long-time heat preservation treatment is not needed in the connection process, and the connection efficiency is high.
As shown in FIG. 2, the invention can realize GH4169 alloy welding by deformation under vacuum, and has the advantages of high welding efficiency, high joint strength and the like.
Claims (4)
1. A GH4169 alloy vacuum thermal deformation connection method is characterized by comprising the following process steps:
1) sanding and pickling surfaces to be welded of GH4169 alloy with sand paper, ultrasonically cleaning in alcohol, and then drying for later use;
2) assembling the surfaces to be welded of the alloy treated in the step 1) in a butt joint mode, placing the alloy in thermal deformation connecting equipment, and vacuumizing the equipment until the vacuum degree is lower than 10-2Pa；
3) Heating the alloy treated in the step 2) to 1120-1150 ℃, wherein the heating rate is 4-6 ℃/s, and the heat preservation time is not more than 30 min;
4) applying axial pressure to the alloy treated in the step 3) and carrying out axial deformation, wherein the deformation speed is 0.010-0.015 mm/s, and the deformation is not less than 40%;
5) unloading the pressure of the alloy treated in the step 4), and cooling the alloy to room temperature.
2. The GH4169 alloy vacuum hot deformation bonding method of claim 1, wherein in step 2), the equipment vacuum degree is 10-2～10-4Pa。
3. The GH4169 alloy vacuum thermal deformation connection method according to claim 1, wherein in the step 3), the temperature of the alloy is raised to 1150 ℃, the temperature raising rate is 5 ℃/s, and the holding time is 5 min.
4. The vacuum thermal deformation connection method of GH4169 alloy according to claim 1, wherein in step 3), the deformation speed is 0.012mm/s and the deformation is 50%.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54109051A (en) * | 1978-02-16 | 1979-08-27 | Ishikawajima Harima Heavy Ind Co Ltd | Diffusion welding method for nickel base super alloy |
| CN101920393A (en) * | 2010-09-25 | 2010-12-22 | 武汉理工大学 | Low-temperature diffusion welding method for magnesium alloy and aluminum alloy |
| CN105665918A (en) * | 2016-03-24 | 2016-06-15 | 西安智拓精密焊接科技有限公司 | Diffusion welding method for improving strength of GH4099 welding joints |
| CN106271013A (en) * | 2016-08-30 | 2017-01-04 | 郑州机械研究所 | A kind of coarse vacuum diffusion welding method of copper and copper alloy and steel |
| CN106271011A (en) * | 2016-09-12 | 2017-01-04 | 西北工业大学 | γ TiAl alloy and the solid-state bonding process of TC17 alloy |
| CN109746561A (en) * | 2019-03-07 | 2019-05-14 | 西北工业大学 | The solid-state bonding process of TC17 alloy and TC4 alloy |
-
2021
- 2021-07-08 CN CN202110772814.7A patent/CN113634870A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54109051A (en) * | 1978-02-16 | 1979-08-27 | Ishikawajima Harima Heavy Ind Co Ltd | Diffusion welding method for nickel base super alloy |
| CN101920393A (en) * | 2010-09-25 | 2010-12-22 | 武汉理工大学 | Low-temperature diffusion welding method for magnesium alloy and aluminum alloy |
| CN105665918A (en) * | 2016-03-24 | 2016-06-15 | 西安智拓精密焊接科技有限公司 | Diffusion welding method for improving strength of GH4099 welding joints |
| CN106271013A (en) * | 2016-08-30 | 2017-01-04 | 郑州机械研究所 | A kind of coarse vacuum diffusion welding method of copper and copper alloy and steel |
| CN106271011A (en) * | 2016-09-12 | 2017-01-04 | 西北工业大学 | γ TiAl alloy and the solid-state bonding process of TC17 alloy |
| CN109746561A (en) * | 2019-03-07 | 2019-05-14 | 西北工业大学 | The solid-state bonding process of TC17 alloy and TC4 alloy |
Non-Patent Citations (2)
| Title |
|---|
| XIAWEI YANG等: "Physical simulation of interfacial microstructure evolution for hot compression bonding behavior in linear friction welded joints of GH4169 superalloy", 《MATERIALS & DESIGN》 * |
| 史耀武: "《焊接技术手册》", 30 April 2005 * |
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