CN116984833A - Processing method of nickel-based superalloy pipe - Google Patents
Processing method of nickel-based superalloy pipe Download PDFInfo
- Publication number
- CN116984833A CN116984833A CN202310823117.9A CN202310823117A CN116984833A CN 116984833 A CN116984833 A CN 116984833A CN 202310823117 A CN202310823117 A CN 202310823117A CN 116984833 A CN116984833 A CN 116984833A
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- China
- Prior art keywords
- heat treatment
- pipe
- straightening
- cold rolling
- processing
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910000601 superalloy Inorganic materials 0.000 title claims abstract description 11
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 10
- 238000003672 processing method Methods 0.000 title claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000005097 cold rolling Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000000137 annealing Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000005482 strain hardening Methods 0.000 claims abstract description 7
- 238000005238 degreasing Methods 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 238000007514 turning Methods 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 3
- 238000005498 polishing Methods 0.000 claims abstract description 3
- 239000004677 Nylon Substances 0.000 claims description 5
- 239000000314 lubricant Substances 0.000 claims description 5
- 229920001778 nylon Polymers 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 2
- 230000001186 cumulative effect Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 7
- 238000003754 machining Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000001192 hot extrusion Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention belongs to the technical field of processing of aviation fluid pipes, and relates to a processing method of a nickel-based superalloy pipe. The processing comprises the following steps: cold working the bar material: turning the outer surface, drilling and boring the inner surface to obtain a tube blank, and annealing the tube blank to enter a cold rolling process; the technical indexes of the finished product pipe are ensured through solution heat treatment after the steps of multi-pass cold rolling, degreasing and cleaning, heat treatment, straightening and polishing and grinding processing are carried out to reach the specification of the finished product.
Description
Technical Field
The invention belongs to the technical field of processing of aviation fluid pipes, and relates to a processing method of a nickel-based superalloy pipe.
Technical Field
The GH3625 alloy pipe is a solid solution strengthening type nickel-based deformation superalloy taking Mo and Nb as main strengthening elements, has excellent corrosion resistance and oxidation resistance, can bear complex stress under the oxidation and gas corrosion conditions of 600-1100 ℃ or even higher, can reliably work for a long time, and is mainly used for hot end parts of aeroengines. The processing method is that after the bar surface is processed, a heating furnace is used for heating, a tube blank is obtained through a hot punching or hot extrusion mode, and the surface oxide skin is removed through an acid washing mode and then enters a cold processing procedure. The pipe with finished product specification can be directly processed through cold processing, processing stress is removed by using a heat treatment mode of stress relief annealing among cold processing channels, oil removal and cleaning are carried out among working procedures, defects of the pipe are prevented after cold processing and heat treatment, and the relevant performance index of the pipe is ensured by a solid solution heat treatment mode of a final finished product.
The processing method has the advantages that the material loss is less, but in order to meet the requirement of a narrower temperature window for hot processing, the sizes of the ingot blank and the extruded tube cannot be small, the small-diameter tube blank is difficult to punch or extrude, meanwhile, the small-diameter tube blank is manufactured by using the large-diameter tube blank, the deformation and the heat treatment channels in the middle are extremely large, and the processing cost is greatly increased. Meanwhile, the recrystallization annealing of the material is sensitive to deformation, and the cold deformation of the pass is required to be reasonably controlled; the material has high strength, severe work hardening, large deformation resistance, extremely easy occurrence of problems such as sticking to the die, and the like, the deformation speed needs to be reduced to reduce impact and heat during rolling, and a high-performance tool and die, a special lubricant and lubricating measures need to be adopted during drawing; for thin-wall pipes, in order to ensure the precision and surface quality of the pipes, the dimensional precision of the mould is strictly controlled, measures are taken to ensure the centering of equipment and the pipes, and even measures such as additional ultrasonic vibration are taken; in addition, the alloy element content is high, carburization, element depletion and other problems are easy to cause due to surface pollution during heat treatment, and the cleaning requirement before heat treatment is higher.
Disclosure of Invention
The invention aims to: the invention provides a processing technology of a nickel-based superalloy pipe, which can be used for producing the nickel-based superalloy with high performance index at low cost and greatly widening the application range of the superalloy pipe for aviation.
The technical scheme is as follows:
a processing method of a nickel-based superalloy pipe comprises the following steps:
cold working the bar material: turning the outer surface, drilling and boring the inner surface to obtain a tube blank, and annealing the tube blank to enter a cold rolling process;
the technical indexes of the finished product pipe are ensured through solution heat treatment after the steps of multi-pass cold rolling, degreasing and cleaning, heat treatment, straightening and polishing and grinding processing are carried out to reach the specification of the finished product.
The deformation amount between cold rolling accumulated times in the processing procedure is not more than 55 percent.
The heat treatment in the processing procedure adopts 900-1100 ℃, and the heat preservation is carried out for 20-40min.
And a nylon straightening roller is used for straightening the pipe.
The tube straightening processing procedure adopts a 6-roller straightener.
The roller diameter D is selected to be 40-50mm, and the straightening speed is selected to be 1.5-3m/min.
The solution heat treatment adopts vacuum heat treatment, the heat treatment temperature is 950-1100 ℃, and the surface of the pipe is bright after the heat treatment.
The cold rolling lubricating oil adopts chlorinated paraffin.
The beneficial effects are that: the pipe blank is manufactured by using a machining mode, so that the processing cost of pickling, heat treatment and pipe blank shaking of the pipe after hot perforation and hot extrusion can be reduced, and the whole production period can be reduced.
Drawings
FIG. 1 is a flow chart of pipe processing.
Detailed Description
The technological process of machining nickel base superalloy pipe includes bar machining, cold rolling, deoiling and cleaning and solution heat treatment.
The bar stock adopts a machining mode, the outer surface is polished, the inner surface adopts a drilling and boring turning mode to obtain a tube blank, and the tube blank enters a cold rolling procedure after annealing. And (3) processing the finished product to the specification after the multi-pass (cold rolling, degreasing and cleaning and heat treatment) working procedure, and obtaining the finished product pipe after solution heat treatment.
The bar material is machined to obtain the tube blank, so that the production cost is greatly reduced. The pipe blank processed by the modes of hot punching, hot extrusion and the like needs to be subjected to pickling to remove surface oxide skin, meanwhile, the pipe blank needs to be processed for multiple times to obtain blank specifications with proper size, the processing cost is high, the period is long, the pipe blank is manufactured by the mode of machining, and the overall cost and the period are lower than the cost required by the mode of hot punching, hot extrusion and the like although the material loss is large.
The cold working accumulated inter-pass deformation is not more than 55%, and the recrystallization annealing of the material is sensitive to the deformation, so that the inter-pass deformation is not more than 55% when the cold rolling deformation is designed, and the process test proves that the surface quality of the pipe in the processing process is good, and the material structure after heat treatment is uniform.
The intermediate pass heat treatment temperature is 900-1100 ℃, and the heat preservation is carried out for 20-40min, so that the heat treatment process parameters ensure that the crystal grains of the pipe do not grow after the heat treatment, and the uniform structure of the pipe is ensured.
The nylon straightening roller is used for straightening the pipe to replace the steel straightening roller, the section rigidity of the thin-wall pipe is low, and remarkable section flattening can occur during straightening, so that a larger reverse bending amount is required compared with a thick-wall pipe to achieve the straightening effect, and the problems of pipe diameter change, scratching of the surface of the pipe by a roller shoulder, large residual stress after straightening and the like are extremely easy to occur. The nylon straightening roller is used for meeting the pipe straightening requirement and avoiding affecting the surface and the size of the pipe.
The solution heat treatment adopts vacuum heat treatment, the heat treatment temperature is 950-1100 ℃, and the surface of the pipe is bright after the heat treatment.
The design scheme of the cold rolling tool and die is that the roller and the core rod are processed and manufactured by adopting high-strength and high-toughness cold-working die steel, and compared with the tool and die manufactured by adopting conventional materials such as common GCr15 and the like, the surface hardness is higher, and the surface quality of the cold-rolled pipe is good.
Machining process of GH3625 alloy bar
The method comprises the steps of processing a phi 60mm bar into a phi 59 multiplied by 11mm tube blank, controlling the outer diameter tolerance within 0.1mm, controlling the wall thickness tolerance within 0.08mm, controlling the outer surface roughness to be Ra1.6, controlling the inner surface roughness to be Ra0.2, and controlling the coaxiality of the tube blank to be not more than 0.16mm after processing, wherein the inner hole is not allowed to have defects such as tool receiving marks, tool withdrawal marks and the like.
2. Continuous cold working of pipes
Rolling the blank by using an LG60 two-roller mill, wherein the lubricant uses more TDN81, the pipe is rolled into phi 47 multiplied by 8.2 by phi 59 multiplied by 11, the deformation is 39.7%, the rolling speed is 0.6m/min, the lubricant is removed by using a water-based cleaning agent after rolling, the heating temperature of the cleaning agent is 70+/-5 ℃, the ultrasonic vibration mode is adopted, the ultrasonic time is 8-10min, the lubricant on the surface of the pipe is removed, the heat treatment is carried out by using a vacuum gas quenching furnace, the heat treatment temperature is 990 ℃, the heat preservation is carried out for 30min, the air cooling is carried out, the pipe is not required to be pickled after the vacuum heat treatment, and the pipe can directly enter the next-pass cold rolling, and the GH3625 alloy pipe meeting the size specification of the finished product is obtained after a plurality of times of circulation.
3. Roller straightening of pipe
After heat treatment, the pipe is possibly bent, the pipe is straightened by using a 6-roller straightener, the straightening precision in the continuous cold rolling process is controlled within 0.2mm/m, the straightening roller is made of nylon, the straightening speed is 1.5-3m/min, and a single branch pipe adopts a straightening mode in the forward and reverse directions.
4. Heat treatment of pipes
The final product is treated by solution heat treatment in a vacuum gas quenching furnace at 1020-1100 deg.C, and is kept for 25-30min, and is gas cooled to heat treatment temperature within + -3 deg.C.
Claims (8)
1. The processing method of the nickel-based superalloy pipe is characterized by comprising the following steps of:
cold working the bar material: turning the outer surface, drilling and boring the inner surface to obtain a tube blank, and annealing the tube blank to enter a cold rolling process;
the technical indexes of the finished product pipe are ensured through solution heat treatment after the steps of multi-pass cold rolling, degreasing and cleaning, heat treatment, straightening and polishing and grinding processing are carried out to reach the specification of the finished product.
2. The method of claim 1, wherein the cumulative amount of cold rolling run-to-run deformation during the manufacturing process is no more than 55%.
3. The method according to claim 1, wherein the heat treatment is carried out at 900-1100 ℃ for 20-40min.
4. The method of claim 1, wherein the tube straightening process uses a nylon straightening roll.
5. The method of claim 4, wherein the tube straightening process is performed using a 6-roll straightener.
6. The method according to claim 5, wherein the roll diameter D is selected to be 40-50mm and the straightening speed is selected to be 1.5-3m/min.
7. The method according to claim 1, wherein the solution heat treatment is a vacuum heat treatment, the heat treatment temperature is 950-1100 ℃, and the surface of the pipe after the heat treatment is bright.
8. The method according to claim 1, wherein the cold rolling lubricant is chlorinated paraffin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310823117.9A CN116984833A (en) | 2023-07-06 | 2023-07-06 | Processing method of nickel-based superalloy pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310823117.9A CN116984833A (en) | 2023-07-06 | 2023-07-06 | Processing method of nickel-based superalloy pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116984833A true CN116984833A (en) | 2023-11-03 |
Family
ID=88524088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310823117.9A Pending CN116984833A (en) | 2023-07-06 | 2023-07-06 | Processing method of nickel-based superalloy pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116984833A (en) |
-
2023
- 2023-07-06 CN CN202310823117.9A patent/CN116984833A/en active Pending
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