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Process for preparing GH4145 alloy pipes

A technology of GH4145 and preparation process, applied in the field of preparation process of GH4145 alloy pipe, can solve the problems of cracking, low performance level and reliability, unstable quality, etc., and achieve the effect of smooth inner and outer surfaces, saving raw materials, and high dimensional accuracy

Inactive Publication Date: 2012-04-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

GH4145 alloy is used in aero-engines to make some important large-scale thin-walled casings in the rear casing parts, as well as planar wave springs, coil springs and spring collar rings, structural parts and bolts. Currently, these casings can be used The method of strip welding or direct bar processing is very low, but the performance level and reliability are very low, and the waste of raw materials is serious. It is formed by conventional rolling methods. For the GH4145 alloy, there are the following main problems:
Both cold and hot processing are more difficult
[0005] (2) The research on the pipe forming process is not systematic and the quality is not stable
For example, the amount of deformation in each pass must be controlled to a certain extent to obtain a completely recrystallized structure, but excessive deformation will cause tube blank hardening, performance exceeding the standard or cracking, and deterioration of processability
In addition, due to the high requirements for dimensional accuracy and surface quality of aerospace pipes, even if the pipes can be formed and the organizational properties are qualified, if the dimensions do not meet the specified accuracy or the surface has folds, cracks, cuts, straight roads, threads, pits, etc. Such defects will still lead to the scrapping of the pipe

Method used

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  • Process for preparing GH4145 alloy pipes
  • Process for preparing GH4145 alloy pipes
  • Process for preparing GH4145 alloy pipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The GH4145 alloy ingot is smelted by vacuum induction and electroslag, forged at 1180℃ to form a Φ40mm round bar with a deformation of 80%, and then solution heat treated at 1020℃×30 minutes, and processed into a Φ41mm×7mm tube by machined drilling The billet is cold-rolled and annealed 5 times repeatedly, and rolled into a Φ29mm×2.5mm pipe. Finished product organization see image 3 , The rolling process parameters are shown in Table 1.

[0031] Table 1 Example 1 Rolling process parameters

[0032]

Embodiment 2

[0034] The GH4145 alloy ingot is smelted by vacuum induction and electroslag, forged at 1120℃ to form a Φ40mm round bar with a deformation of 37%, and then solution heat treated at 1000℃×30 minutes, and processed into a Φ41mm×6.5mm tube by machined drilling The tube is cold-rolled and annealed repeatedly 8 times to form a tube of Φ25mm×0.6mm. The structure is shown in Figure 4 , The rolling process parameters are shown in Table 2.

[0035] Table 2 Example 2 Rolling process parameters

[0036]

[0037]

Embodiment 3

[0039] The GH4145 alloy ingot is smelted by vacuum induction and electroslag, and forged at 1120℃ to form a Φ40mm round bar with a deformation of 37%. After solution heat treatment at 1000℃×30 minutes, it is processed into a Φ41mm×6mm tube billet by machining and drilling. , This pipe is cold-rolled and annealed repeatedly 8 times, and rolled into a Φ25.8mm×0.4mm pipe. The structure is shown in Figure 5 , The rolling process parameters are shown in Table 3.

[0040] Table 3 Example 3 Rolling process parameters

[0041]

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Abstract

The invention aims to provide a process for preparing GH4145 alloy pipes, and in particular relates to a method for rolling GH4145 alloy precision pipes. In the method, the deformation quantity of pipe blanks and the deformation gradient of outer diameters (wall thicknesses) of the pipes are controlled by a cold rolling and annealing method to reduce non-uniform deformation, obtain uniform and appropriate tissue and qualified precision pipes and meet higher using requirements. The method comprises the following processes of: smelting, forging, performing solid solution heat treatment, machining, drilling, performing cold rolling and annealing repeatedly (3 to 15 times generally) and thus obtaining finished products. The method is characterized in that: the forging temperature is between 1,100 and 1,200 DEG C, and the deformation quantity is between 35 and 80 percent; the temperature of the solid solution heat treatment is between 950 and 1,040 DEG C, and is kept for 20 to 60 minutes; and in the cold milling process, a ratio of sizing reduction to wall reduction in each pass is controlled to be 2 to 4.

Description

Technical field [0001] The invention relates to a preparation process of GH4145 alloy pipe. Background technique [0002] GH4145 alloy is a γ'〔Ni3(Al, Ti, Nb)] phase aging strengthened nickel-based deformed high temperature alloy, which has been widely used abroad. The alloy has excellent comprehensive mechanical properties and can be processed into profiles such as plates, rods, wires, and belts, as well as various fasteners and pipe parts. GH4145 alloy is used in aero engines to make some important large-size thin-walled casings in the rear casing components, as well as flat wave springs, coil springs, spring clamp rings, structural parts and bolts. These casings can be used at present Strip welding or directly using bar processing methods, but the performance level and reliability are very low, and the raw material waste is serious, the conventional rolling method is used for forming, for GH4145 alloy, there are the following main problems: [0003] (1) Material processing is ...

Claims

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Application Information

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IPC IPC(8): B21B37/78C22F1/10
Inventor 张伟红孙文儒李胜超华培涛信昕于连旭刘芳祁峰贾丹郭守仁胡壮麒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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