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Manufacturing technology for optimized cobalt-base deformed high-temperature alloy forged bar

A technology for deforming superalloys and manufacturing processes, which is applied in the field of superalloy forging processing, can solve problems such as the aggregation of carbide strips, and achieve the effect of improving the uniformity of the microstructure

Active Publication Date: 2019-04-19
FUSHUN SPECIAL STEEL SHARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production of GH5188 alloy bars at home and abroad usually adopts the above-mentioned direct-drawing process and heating process; however, the GH5188 finished bars produced by this process have serious carbide strips (see figure 1 )The problem

Method used

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  • Manufacturing technology for optimized cobalt-base deformed high-temperature alloy forged bar
  • Manufacturing technology for optimized cobalt-base deformed high-temperature alloy forged bar
  • Manufacturing technology for optimized cobalt-base deformed high-temperature alloy forged bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] GH5188 alloy forged rod finished product, specification Φ180mm;

[0029] The ingot shape is Φ480mm, the heating temperature of the steel ingot is 1160°C, and the holding time is 3h;

[0030] Fast forging first fire forging: heating temperature 1160°C, single hammer reduction 30mm, forging to Φ450mm, deformation 12%;

[0031] Intermediate billet heating: the intermediate billet Φ450mm is returned to the furnace, the heating temperature is 1160°C, and the refiring time is 2h;

[0032] Fast forging intermediate heat forging: Φ450mm intermediate billet undergoes 1 upsetting + drawing, pier thickness 200mm, drawing length to Φ450mm, forging heating temperature 1160°C, deformation 44%;

[0033] Intermediate billet heating: intermediate billet Φ450mm, reheating temperature 1160°C, refiring time 2h;

[0034] Fast forging intermediate fire secondary forging: Φ450mm intermediate billet is drawn up to 350mm square, the forging heating temperature is 1160°C, and the deformation i...

Embodiment 2

[0041] GH5188 alloy forged rod finished product, specification Φ250mm;

[0042] The ingot shape is Φ480mm, the heating temperature of the steel ingot is 1170°C, and the holding time is 2h.

[0043] Fast forging first fire forging: heating temperature 1170℃, single hammer reduction 30mm, forging to Φ450mm, deformation 12%;

[0044] Intermediate billet heating: the intermediate billet Φ450mm is returned to the furnace, the heating temperature is 1170°C, and the refiring time is 2.5h;

[0045] Fast forging intermediate heat forging: Φ450mm intermediate billet undergoes 2 times of upsetting + elongation, pier thickness 200mm, elongation to Φ450mm, forging heating temperature 1170°C, deformation 44%;

[0046] Intermediate billet heating: intermediate billet Φ450mm, reheating temperature 1170°C, refiring time 2.5h;

[0047] Fast forging and last fire forging: the billet is elongated in one direction, the single hammer reduction is 50mm, the elongation is Φ330mm, the forging heatin...

Embodiment 3

[0052] GH5188 alloy forged rod finished product, specification Φ300mm;

[0053] The ingot shape used is Φ480mm, the actual ingot heating temperature is 1150°C, and the holding time is 3h.

[0054] Fast forging first fire forging: heating temperature 1150℃, single hammer reduction 30mm, forging to Φ450mm, deformation 12%;

[0055] Intermediate billet heating: the intermediate billet Φ450mm is returned to the furnace, the heating temperature is 1150°C, and the refiring time is 3h;

[0056] Fast forging intermediate fire secondary forging: Φ450mm intermediate billet undergoes 3 times of upsetting + drawing, pier thickness 200mm, drawing length to 450mm square, forging heating temperature 1150°C, deformation amount 45%;

[0057] Intermediate billet heating: intermediate billet Φ450mm, reheating temperature 1150°C, refiring time 3h;

[0058] Fast forging and last fire forging: the billet is elongated in one direction, the single hammer reduction is 50mm, the elongation is Φ360mm,...

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Abstract

The invention discloses a manufacturing technology for an optimized cobalt-base deformed high-temperature alloy forged bar and aims to achieve the technical effect that a high-temperature alloy GH 5188 finished product bar reaches a state that carbide is distributed in a dispersing manner. According to the technical scheme, the manufacturing technology for the optimized cobalt-base deformed high-temperature alloy forged bar comprises the steps that repeated upsetting, drawing out and reburning heating technologies are adopted, and a combined forging manner of fast forging and radial forging isadopted; the deformation amount is controlled between 35% and 45%, the fast forging end fire one-way drawing out deformation amount is controlled between 45% and 55%, and the radial forging deformation amount is larger than 30% so that bar billet structures can be fully crushed; and the middle heating number heating time is two hours to three hours so that static recrystallization can be fully completed by non-recrystallizing structures in fast forging and accumulated carbide can be precipitated again in a dispersing manner after being fully redissolved, and the forged bar with carbide distributed in a dispersing manner is finally acquired. The manufacturing technology for optimized cobalt-base deformed high-temperature alloy forged bar has the advantages that firstly, through control over the number of upsetting times and the deformation amount of each heating number, uniformity of microstructures of the bar is improved; and secondly, through adjustment of the reburning heating time,structures which do not fully recrystallize in a previous heating number is prompted to fully complete static recrystallization, and the accumulated carbide is precipitated in a dispersing manner ina reforging process after being fully redissolved.

Description

technical field [0001] The invention belongs to the field of high-temperature alloy forging processing, and in particular relates to an optimized manufacturing process of cobalt-based deformed high-temperature alloy forging rods. Background technique [0002] The GH5188 alloy is a cobalt-based oxidation-resistant superalloy that relies on 14.5% tungsten solid solution strengthening and carbide dispersion strengthening. The rare earth element lanthanum is added to the alloy to improve the oxidation resistance of the material, and boron is added to strengthen the grain boundary; the alloy has a high Tensile strength, good plasticity, excellent durability, welding performance and oxidation resistance, the service temperature can reach 1000 ° C, mainly used in aero-engine vortex plates, flame guides, combustion chamber walls, combustion chamber walls, sealing sheets High temperature components and coal chemical equipment pipeline lining, nozzles and other components. The tradit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J1/06
CPCB21J1/06B21J5/008
Inventor 候智鹏张鹏王艾竹李飞扬王志刚张玉春
Owner FUSHUN SPECIAL STEEL SHARES
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