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A device and method for preparing fine-grained powder superalloy hot isostatic pressed parts

A technology of isostatic pressing and high temperature alloy, applied in the field of static pressing parts, can solve the problems of insufficient recrystallization driving force, lower yield, insufficient deformation, etc., to solve the problem of original particle boundary, reduce powder surface segregation, Guaranteed uniform distribution

Active Publication Date: 2022-05-17
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The appearance of the original grain boundary will significantly reduce the plasticity of the powder disc, resulting in notch sensitivity
At the same time, in the subsequent hot extrusion process, most of the extrusion energy is used to break the boundaries of the original powder particles, so that the deformation during the extrusion process is insufficient, and the recrystallization driving force of the part of the deformed area is insufficient, resulting in the extruded parts. Inhomogeneous structure, which reduces the yield
Although using a larger extrusion force can effectively remove the dense original particle boundaries, this conflicts with the basic status quo of the lack of large extrusion machines in our country

Method used

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  • A device and method for preparing fine-grained powder superalloy hot isostatic pressed parts
  • A device and method for preparing fine-grained powder superalloy hot isostatic pressed parts
  • A device and method for preparing fine-grained powder superalloy hot isostatic pressed parts

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment provides a method of applying the above-mentioned device to prepare a hot isostatic pressed product of a fine-grained powder superalloy, which specifically includes the following steps:

[0054] Step 1: Prepare superalloy powder with fine particle size by gas atomization method or plasma rotating electrode method;

[0055] Step 2: Use the powder loading tank 1 to put the fine-grained superalloy powder into the bag 7 through the powder lower pipe 2. When the powder is loaded into the bag 7, the vacuum degree in the device body 3 is less than 0.01Pa, and the heat preservation of the bag 7 The temperature is 500°C, the powder feeding rate is 20kg / h, and the vibration frequency is 30Hz;

[0056] Step 3: After the powder is full, turn off the vacuum pump group 5 and fill in CO gas until the pressure in the device body 3 is 0.02 MPa, heat the jacket 7 to 600°C, and keep it warm for 3 hours; wherein, the purity of the CO gas is greater than or equal to 99.999%;...

Embodiment 2

[0060] This embodiment provides a method of applying the above-mentioned device to prepare a hot isostatic pressed product of a fine-grained powder superalloy, which specifically includes the following steps:

[0061] Step 1: Prepare superalloy powder with fine particle size by gas atomization method or plasma rotating electrode method;

[0062] Step 2: Use the powder loading tank 1 to put the fine-grained superalloy powder into the bag 7 through the powder lower pipe 2. When the powder is loaded into the bag 7, the vacuum degree in the device body 3 is less than 0.01Pa, and the heat preservation of the bag 7 The temperature is 550°C, the powder feed rate is 25kg / h, and the vibration frequency is 40Hz;

[0063] Step 3: After the powder is full, turn off the vacuum pump group 5 and fill in CO gas until the pressure in the device body 3 is 0.025 MPa, heat the envelope 7 to 700°C, and keep it warm for 2.5 hours; the purity of CO gas is greater than or equal to 99.999% ;

[0064...

Embodiment 3

[0067] This embodiment provides a method of applying the above-mentioned device to prepare a hot isostatic pressed product of a fine-grained powder superalloy, which specifically includes the following steps:

[0068] Step 1: Prepare superalloy powder with fine particle size by gas atomization method or plasma rotating electrode method;

[0069] Step 2: Use the powder loading tank 1 to put the fine-grained superalloy powder into the sheath through the powder lowering pipe 2. When the powder is loaded into the sheath 7, the vacuum degree in the device body 3 is less than 0.01Pa, and the heat preservation temperature of the sheath 7 The temperature is 600℃, the feeding rate is 30kg / h, and the vibration frequency is 50Hz;

[0070] Step 3: After the powder is full, turn off the vacuum pump group 5 and fill in CO gas until the pressure in the device body 3 is 0.03 MPa, heat the envelope 7 to 900°C, and keep it warm for 2 hours; wherein, the purity of the CO gas is greater than or e...

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Abstract

The invention belongs to the technical field of high-temperature alloys, and relates to a device and method for preparing fine-grained powder high-temperature alloy hot isostatic pressed parts. The powder is reduced by CO at high temperature, and the O adsorbed on the surface of the powder particles is effectively removed. 2 and H 2 O, thereby solving the original grain boundary problem in hot isostatic pressed parts; on the other hand, CO and O 2 、H 2 In the process of O reaction, sintering diameters will be formed between powder particles, which can avoid powder stratification caused by low-frequency vibration during transportation, and ensure the uniform distribution of powder in the package. Utilizing the method provided by the present invention can effectively solve the problem of the original particle boundary in the process of hot isostatic pressing of fine-grained powder, and is beneficial to obtain extruded parts with fine grains and uniform structure in the subsequent hot extrusion process. Improve the yield of hot extrusion process.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloys, and relates to a device and a method for preparing fine-grained powder high-temperature alloy hot isostatic pressed parts. Background technique [0002] Nickel-based superalloys are mainly used to manufacture hot-end parts of engines such as turbine disks. With the improvement of engine performance, the thrust-to-weight ratio, gas temperature before the turbine, and compressor boost ratio continue to increase, while the number of compressor and turbine stages gradually decreases. , so that the single-stage load continues to increase, the stress level of the parts is getting higher and higher, and the working conditions are getting worse. There are more stringent requirements for the high-temperature strength, fatigue performance and durability of the material. In the process of preparing high-temperature alloys, the performance can only be improved by continuously increasing the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/15B22F1/145
CPCB22F3/15B22F2003/153B22F2999/00B22F2201/04Y02P10/25
Inventor 宋嘉明刘海浪白瑞敏瞿宗宏陈蕾蕾赖运金王庆相梁书锦
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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