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Heat treatment process for improving GH4145 alloy pipe

A technology of GH4145 and pipe materials, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of fast cooling speed, cracking, low temperature, etc., and achieve the effects of improved processing performance, smooth inner and outer surfaces, and simple process

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

Mainly reflected in: too high heat treatment temperature will cause excessive grain growth and reduce plasticity
However, if the temperature is too low, a completely recrystallized structure cannot be obtained, and the purpose of eliminating processing stress cannot be achieved.
If the cooling rate is too fast, it is easy to cause temperature difference stress and cause cracking
If the cooling speed is too slow, it will cause age hardening, which will increase the difficulty of the next processing or the performance will exceed the standard and the pipe will be scrapped.

Method used

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  • Heat treatment process for improving GH4145 alloy pipe
  • Heat treatment process for improving GH4145 alloy pipe
  • Heat treatment process for improving GH4145 alloy pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Heat treatment: In the first stage, heat up to 600°C with the furnace for 15 minutes; in the second stage, heat to 980°C and hold for 20 minutes;

[0020] Rapid cooling: the cooling gas is nitrogen, the cooling pressure is 4bar, and the cooling rate is greater than 350°C / min before cooling to 500°C (cooling rate see figure 1 ), and then cooled to room temperature with the furnace.

[0021] The organizational chart of the resulting finished product is shown in image 3 , whose hardness see figure 2 , see Table 1 for performance data.

Embodiment 2

[0023] Heat treatment: In the first stage, heat up to 600°C with the furnace for 20 minutes; in the second stage, heat to 1030°C and hold for 15 minutes;

[0024] Rapid cooling: the cooling gas is argon, the cooling pressure is 6bar, and the cooling rate is greater than 350°C / min before cooling to 500°C (cooling rate see figure 1 ), and then cooled to room temperature with the furnace.

[0025] The organizational chart of the resulting finished product is shown in Figure 4 , and its performance data are shown in Table 1.

Embodiment 3

[0027] Heat treatment: In the first stage, heat up to 600°C with the furnace for 15 minutes; in the second stage, heat to 1000°C and hold for 18 minutes;

[0028] Rapid cooling: the cooling gas is argon, the cooling pressure is 5bar, and the cooling rate is greater than 350°C / min before cooling to 500°C, and then cooled to room temperature with the furnace.

[0029] The organizational chart of the resulting finished product is shown in Figure 5 , and its performance data are shown in Table 1.

[0030] Table 1 Comparison of pipe properties at different cooling rates

[0031]

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Abstract

The present invention specifically provides a heat treatment process for improving a GH4145 alloy pipe. The heat treatment process is characterized in that: the technical process comprises: (1) adopting a vacuum gas quenching furnace to carry out sectional heating for the pipe along with the furnace, wherein the two-stage heating process comprises that: in the first stage heating process, heatingalong with the furnace to the temperature of 600 DEG C, holding the temperature for 15-20 minutes, and eliminating harmful gas impurities; in the second stage heating process, heating to the temperature of 970-1040 DEG C from the temperature of 600 DEG C, holding the temperature for 15-20 minutes, eliminating the residual stress force, and stabilizing the organization; (2) carrying out rapid cooling: wherein the cooling pressure is 4-6 bar, the cooling rate is more than 350 DEG C per minute before the temperature is reduced to 500 DEG C so as to avoid the precipitation of the gamma' strengthening phase; (3) obtaining the finished product. According to the present invention, the vickers hardness of the heat-treated pipe is less than or equal to 240; the cooling gas is nitrogen or argon.

Description

technical field [0001] The invention relates to an improved heat treatment process for GH4145 alloy pipes. Background technique [0002] GH4145 alloy is a γ′ [Ni3 (Al, Ti, Nb)] phase aging strengthened nickel-based deformation superalloy, which has excellent comprehensive properties and has been widely used abroad. For the GH4145 alloy, the intermediate annealing in the tube forming process and the heat treatment of the finished tube play a vital role in the control of tube forming, structure, performance and quality. Mainly reflected in: too high heat treatment temperature will cause excessive grain growth and reduce plasticity. However, if the temperature is too low, a completely recrystallized structure cannot be obtained, and the purpose of eliminating processing stress cannot be achieved. If the cooling rate is too fast, it is easy to cause temperature difference stress and cause cracking. If the cooling speed is too slow, it will cause age hardening, which will incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08
Inventor 张伟红孙文儒华培涛李胜超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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