Heat treatment process for improving GH4145 alloy pipe
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF1 Cites 7 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
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]
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
Vickers hardness
aaaaa
aaaaa
Vickers hardness
aaaaa
aaaaa
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more
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
Login to view more