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Method for rapidly eliminating dendritic segregation in deformed high-temperature alloy ingot by pulse current

A technology of deforming superalloy and pulse current, applied in the field of dendrite segregation, can solve the problems of high heat treatment temperature, long treatment time, complicated process, etc., achieve low room temperature yield strength, realize plasticity, and accelerate the effect of diffusion rate

Active Publication Date: 2020-08-25
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although dendrite segregation can be better eliminated through the above methods, due to the high temperature, long processing time, complicated process and high energy consumption of traditional heat treatment, it does not meet the requirements of the current industrial green development plan.

Method used

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  • Method for rapidly eliminating dendritic segregation in deformed high-temperature alloy ingot by pulse current
  • Method for rapidly eliminating dendritic segregation in deformed high-temperature alloy ingot by pulse current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this embodiment, the pulse parameters are set to 30000Hz, 1.2V, 14.721A / mm 2 . Under this parameter, the temperature measured by the K-type thermocouple is 850°C. Continue to apply the pulse for 30min, then air cool to room temperature. Specific steps are as follows:

[0032] (1) Take a rectangular deformation area of ​​20×4×1.5mm 3 The first-stage homogenized heat-treated material, the surface is polished with 180 mesh, 600 mesh, 1000 mesh, 1500 mesh and 2000 mesh sandpaper in sequence until there are no visible defects to ensure good contact with the pulse electrode.

[0033](2) Pulse current external field treatment. Fix the superalloy polished in step (1) to both ends of the pulse power supply with copper fixtures. The pulse treatment was continued at room temperature for 30 minutes, and the surface temperature of the superalloy was 850 °C measured by a K-type thermocouple after applying a pulse current external field.

[0034] (3) Test the tensile strength...

Embodiment 2

[0038] In this embodiment, the pulse parameters are set to 30000Hz, 1.45V, 17.570A / mm 2 . Under this parameter, the temperature is measured by a K-type thermocouple, and the temperature is 950°C. Continue to apply the pulse for 30min, then air cool to room temperature.

[0039] (1) Take a rectangular deformation area of ​​20×4×1.5mm 3 The first-stage homogenized heat-treated material, the surface is polished with 180 mesh, 600 mesh, 1000 mesh, 1500 mesh and 2000 mesh sandpaper in sequence until there are no visible defects to ensure good contact with the pulse electrode.

[0040] (2) Pulse current external field treatment. Fix the superalloy polished in step (1) to both ends of the pulse power supply with copper fixtures. The pulse treatment was continued for 30 minutes at room temperature, and the surface temperature of the superalloy was 950 °C measured by a K-type thermocouple after applying a pulse current external field.

[0041] (3) Test the tensile strength at room...

Embodiment 3

[0045] In this embodiment, the pulse parameters are set to 30000Hz, 1.6V, 19.676A / mm 2 . Under this parameter, the temperature is measured by a K-type thermocouple, and the temperature is 1050°C. Continue to apply the pulse for 30min, then air cool to room temperature. Specific steps are as follows:

[0046] (1) Take 30×4×1.5mm 3 With rectangular deformation zone 20 x 4 x 1.5mm 3 The material in the first-stage homogenization heat treatment state, the surface is polished with 180 mesh, 600 mesh, 1000 mesh, 1500 mesh and 2000 mesh sandpaper in sequence until there are no visible defects to the naked eye to ensure good contact with the pulse electrode.

[0047] (2) Pulse current external field treatment. Fix the superalloy polished in step (1) to both ends of the pulse power supply with copper fixtures. The pulse treatment was continued for 30 minutes at room temperature, and the surface temperature of the superalloy was 1050 °C measured by a K-type thermocouple after appl...

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Abstract

The invention relates to the technical field of turbine disk preparation, and provides a method for rapidly eliminating dendritic segregation in a nickel-based deformed high-temperature alloy ingot for a turbine disk by pulse current (mainly aimed at the second stage of traditional homogenization heat treatment). Under the coupling effect of the pulse current and joule heat, the diffusion abilityof segregation element atoms is greatly enhanced, and the dendritic segregation can be quickly eliminated under the pulse current external field. The parameter range of the pulse external field processing is as follows: the frequency is 3000Hz, the voltage is 0.1V-100V, the current density is 1A / mm<2>-150A / mm<2>, and the processing time is 5min-20h. Compared with the long-time high-temperature treatment in the traditional single thermal field, the method can quickly eliminate dendritic segregation under suitable pulse parameters, and realizes the uniform distribution of segregation elements; and the high-temperature alloy after treatment has relatively low strength, and is relatively conducive to the subsequent cogging forging process. Not only that, the technical means of the invention isa green energy-saving bran-new means, is in line with the current concept and requirements of green development, and has broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy turbine disk preparation, and in particular relates to a new method for quickly eliminating dendrite segregation in a nickel-based deformed high-temperature alloy ingot for a turbine disk by an external pulse current field. [0002] technical background [0003] Since the birth of superalloys in the last century, the huge demand for high-temperature materials in the hot end parts of aero-engines has continuously promoted the rapid development of superalloys. Among the three types of superalloys including deformation, casting and powder, deformation superalloys are the most widely used. Deformed superalloys are mainly used to manufacture high-temperature components such as aero-engine turbine disks and combustion chambers. Turbine disk is an important part of the engine, not only the working temperature is high, but also the stress conditions of each part are extremely complex. Ther...

Claims

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Application Information

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IPC IPC(8): C22F1/10C22F3/00
CPCC22F1/10C22F3/00
Inventor 张新房王民庆白荣晟秦书洋杜金辉
Owner UNIV OF SCI & TECH BEIJING
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