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GH738 high-temperature alloy grain homogenization forging technology

A technology of GH738 and high-temperature alloy, which is applied in the field of high-temperature alloy forging, can solve the problems of inconspicuous heat preservation effect, cracking of forgings, and easy falling off, etc., so as to increase the amount of deformation in a single pass, facilitate forging deformation, and improve the uniformity of grain size of the structure Effect

Inactive Publication Date: 2021-05-25
WUXI PAIKE HEAVY CASTING & FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the forging adopts the conventional low forging temperature, and then adopts the method of wrapping asbestos on the outside of the forging for heat preservation. The asbestos is easy to fall off during the forging process, resulting in no obvious heat preservation effect; The crystallization temperature range is small, and it is easy to produce mixed crystals, which leads to cracking of forgings

Method used

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  • GH738 high-temperature alloy grain homogenization forging technology
  • GH738 high-temperature alloy grain homogenization forging technology
  • GH738 high-temperature alloy grain homogenization forging technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: A kind of GH738 superalloy crystal grain homogenization forging technology, such as figure 1 shown, including the following steps:

[0021] S1, blanking to obtain a blank. The blank size is Φ230×450mm.

[0022] S2, the first fire forging heating. Place the billet in the heating furnace, raise the temperature to 920°C, and keep it for 120 minutes; continue to raise the temperature to 1140°C, and keep it for 140 minutes.

[0023] S3, blank upsetting and punching. The upsetting height along the axial direction is Φ330×220mm, and the punching hole is Φ120mm. During the deformation process, the deformation amount of a single pass is ≥50%, and the strain rate of the material is ≥5mm / s. The crystal grains are fully broken, further improving the uniformity of the grain size of the structure.

[0024] S4, the second fire forging heating. Place the billet in a heating furnace, raise the temperature to 1140°C, and keep it warm for 50 minutes.

[0025] S5, the ...

Embodiment 2

[0032] Embodiment 2: a kind of GH738 superalloy crystal grain homogeneous forging technology, the steps different from embodiment 1 are:

[0033] S2, the first fire forging heating. Place the billet in the heating furnace, raise the temperature to 940°C, and keep it for 130 minutes; continue to raise the temperature to 1150°C, and keep it for 150 minutes.

[0034] S4, the second fire forging heating. Place the billet in a heating furnace, raise the temperature to 1150°C, and keep it warm for 60 minutes.

[0035] S6, the third fire forging heating. Place the billet in a heating furnace, raise the temperature to 1150°C, and keep it warm for 40 minutes.

[0036] S8, solid solution strengthening of ring forgings. After heating the ring forging to 1025°C and keeping it warm for 220 minutes, it was taken out of the furnace and cooled with water at room temperature for 30 minutes.

[0037] S9. One-time aging treatment for ring forgings. In step S9, the ring forging is heated to...

Embodiment 3

[0040] Embodiment 3: a kind of GH738 superalloy crystal grain homogeneous forging technology, the steps different from embodiment 1 are:

[0041] S2, the first fire forging heating. Place the billet in the heating furnace, raise the temperature to 960°C, and keep it for 140 minutes; continue to raise the temperature to 1160°C, and keep it for 160 minutes.

[0042] S4, the second fire forging heating. Place the billet in a heating furnace, raise the temperature to 1160°C, and keep it warm for 70 minutes.

[0043] S6, the third fire forging heating. Place the billet in a heating furnace, raise the temperature to 1160°C, and keep it warm for 50 minutes.

[0044] S8, solid solution strengthening of ring forgings. After heating the ring forging to 1040°C and keeping it warm for 250 minutes, it was taken out of the furnace for water cooling, the water temperature was room temperature, and the water entry time was 40 minutes.

[0045] S9. One-time aging treatment for ring forgin...

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Abstract

The invention discloses a GH738 high-temperature alloy grain homogenization forging technology, and belongs to the field of high-temperature alloy forging. The technology is characterized by comprising the following steps: S1, blanking to obtain a blank; S2, conducting first-fire forging heating; S3, upsetting and punching the blank; S4, conducting second-fire forging heating; S5, conducting secondary-fire forging; S6, conducting third-fire forging heating; S7, performing third-fire forging to obtain a ring forged piece; S8, carrying out solution strengthening on the ring forged piece; S9, conducting primary ageing treatment on the ring forged piece; and S10, conducting secondary ageing treatment on the ring forged piece. The technology has the advantages that dynamic recrystallization is fully carried out in the deformation process, grains are fully crushed, the grain size of a structure is made to be uniform and consistent, mixed crystals are reduced, and the problem of cracking of the forged piece is solved.

Description

technical field [0001] The invention relates to the technical field of high-temperature alloy forging, in particular to a GH738 high-temperature alloy crystal grain uniform forging technology. Background technique [0002] Aeroengines are one of the important symbols to measure a country's aviation strength and technological capabilities. Case-type forgings are the base of aero-engines, the main structure and main load-bearing parts of the engine, and the service environment is harsh, which requires high comprehensive mechanical properties of materials. [0003] The GH738 material has better comprehensive mechanical properties than the traditional GH4169 material, and is being widely used in various parts of aero-engines. At present, the forging adopts the conventional low forging temperature, and then adopts the method of wrapping asbestos on the outside of the forging for heat preservation. The asbestos is easy to fall off during the forging process, resulting in no obvio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J1/06B21J5/00B21K21/02
CPCB21J1/06B21J5/002B21K21/02
Inventor 刘其源王雪张建军叶显艮万志超
Owner WUXI PAIKE HEAVY CASTING & FORGING