Forging method of GH4169 alloy ultrafine grain forging

A GH4169, ultra-fine grain technology, applied in the direction of metal processing equipment, etc., can solve the problems of failure to meet the standard requirements, fatigue performance of parts, etc., and achieve the effect of excellent fatigue performance

Inactive Publication Date: 2017-11-24
上海怀德机电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early production process, due to the lack of research on the forging process of the related GH4169 alloy, the grain size can generally only reach about 8 grades, which cannot meet the standard requirements, and the final parts cannot obtain excellent fatigue properties.

Method used

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  • Forging method of GH4169 alloy ultrafine grain forging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Finished product specifications: Φ250×60mm thin wafer cake

[0016] 1. Use a Φ220mm round bar as the initial billet for pretreatment of δ phase precipitation. The pretreatment is carried out in an electric furnace. The treatment process is 910°C for 12 hours, and the furnace is air-cooled after treatment.

[0017] 2. The Φ220mm round bar blank is heated at 970°C, and the surface of the blank is covered with a heat-insulating cotton that can be pasted. Then, it is drawn in one direction on a 1200-ton fast forging machine, and it is drawn to Φ140mm in one fire. The forging ratio is 2.5, and the final forging temperature is It is 920°C.

[0018] 3. The Φ140mm round bar is polished on the surface to remove defects such as micro-cracks on the surface to ensure the surface quality of the finished product. Then cut to length to form die forging billet, the billet size is Φ130×270mm.

[0019] 4. Φ130×270mm is heated by an electric furnace at a heating temperature of 970°C. Th...

Embodiment 2

[0022] Finished product specifications: Φ250×60mm thin wafer cake

[0023] 1. Use a Φ140mm×280mm round bar as the initial billet for pretreatment of δ phase precipitation. The pretreatment is carried out in an electric furnace. The treatment process is 910°C for 12 hours, and it is air-cooled after treatment.

[0024] 2. The Φ140mm×280mm round bar blank is heated at 970°C, and the surface of the blank is covered with a heat-insulating cotton that can be pasted, and then upsetting is carried out on a 2,000-ton hydraulic press machine, upsetting 30%, and it is pulled out to Φ140mm×280mm by holding tongs, forged The ratio is 2.7, and the final forging temperature is 910°C.

[0025] 3. The Φ140mm round bar is polished on the surface to remove defects such as micro-cracks on the surface to ensure the surface quality of the finished product. Then cut to length to form die forging billet, the billet size is Φ130×270mm.

[0026] 4. Φ130×270mm is heated by an electric furnace at a he...

Embodiment 3

[0029] Finished product specifications: Φ300×70mm thin wafer cake

[0030] 1. Use a Φ250mm round bar as the initial billet for pretreatment of δ phase precipitation. The pretreatment is carried out in an electric furnace. The treatment process is 910°C for 12 hours, and the furnace is air-cooled after treatment.

[0031] 2. The Φ250mm round bar blank is heated at 970°C, and the surface of the blank is covered with a heat-insulating cotton that can be pasted. Then, it is drawn in one direction on a 1200-ton fast forging machine, and it is drawn to Φ160mm in one fire. The forging ratio is 2.4, and the final forging temperature is It is 920°C.

[0032] 3. The Φ160mm round bar is polished on the surface to remove defects such as micro-cracks on the surface to ensure the surface quality of the finished product. Then cut to length to form die forging billet, the billet size is Φ150×310mm.

[0033] 4. Φ150×310mm is heated by an electric furnace at a heating temperature of 970°C. Th...

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Abstract

The invention discloses a forging method of a GH4169 alloy ultrafine grain forging; the forging method comprises: 1) subjecting a forging blank to sigma phase precipitation pretreatment at 890-920 DEG C for not shorter than 8 hours in order to precipitate a certain amount of sigma phase for controlling growth of crystal grains in thermal machining; 2) heating the forging blank to 950-980 DEG C, performing unidirectional drawing or upsetting drawing with an oil press or a rapid forging press at a total forging ratio of not less than 2 in order to crush needle sigma phase and acquire fine crystal grain structure; 3) heating the forging blank to 950-980 DEG C for not shorter than 50 min, and performing final forging forming in order to obtain a fine grain structure.

Description

technical field [0001] The invention relates to a high-temperature alloy forging method, which belongs to the field of thermal processing, in particular to a forging method of a GH4169 alloy ultra-fine grain forging. Background technique [0002] The GH4169 superalloy is a nickel-based superalloy that is precipitated and strengthened by body-centered square γ″ and face-centered cubic γ′ phases. The following yield strength ranks first in superalloys, and has good fatigue resistance, radiation resistance, oxidation resistance and corrosion resistance, as well as good processing performance and welding performance, so it is widely used in aerospace, nuclear energy, petrochemical, engine and other industries field. [0003] It is well known that grain refinement can significantly improve the fatigue performance of GH4169 alloy. Some fields of application are special. For example, a certain type of Stirling engine GH4169 alloy requires a grain size of 10 or finer. At the same...

Claims

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Application Information

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IPC IPC(8): B21J5/00
CPCB21J5/00
Inventor 廖智姿谢华伟黄仕康
Owner 上海怀德机电有限公司
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