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Method for improving grain size distribution uniformity of powder high-temperature alloy

A technology of distribution uniformity and high-temperature alloy, which is applied in the field of material science and engineering, can solve the problem that the uniformity of grain structure is not effectively controlled, and achieve the effect of excellent comprehensive mechanical properties, simple operation and easy implementation

Inactive Publication Date: 2018-05-18
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above studies only improved the uniformity of the grain structure by adjusting the parameters of the thermal deformation process. However, the uniformity of the grain structure has not been effectively controlled.

Method used

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  • Method for improving grain size distribution uniformity of powder high-temperature alloy
  • Method for improving grain size distribution uniformity of powder high-temperature alloy
  • Method for improving grain size distribution uniformity of powder high-temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Material: nickel-based powder superalloy, chemical composition (wt%) is 13Co, 16Cr, 4.0W, 4.0Mo, 0.7Nb, 2.13Al, 3.73Ti, 0.053C, 0.016B, 0.045Zr, Ni. Alloy powder is produced by argon atomization. After the powder is degassed, packaged, sealed and welded, it is densified by hot isostatic pressing; rods are prepared by extrusion, tested and cut, then isothermally forged into forgings, and then heat treated. Two different heating systems are selected during the solution heating process. Solution heating treatment 1: room temperature is heated to a solution temperature of 1150 °C at an average heating rate of 3.5 °C / min, and then air-cooled after holding for 4 hours; solution heating treatment 2: room temperature The temperature was raised to 970°C at a heating rate of 3.5°C / min, and the difference between the solid solution temperature and the solution temperature was 180°C, and then the temperature was raised to a solid solution temperature of 1150°C at a rate of 65°C / min,...

Embodiment 2

[0047] Material: nickel-based powder superalloy, chemical composition (wt%) is 21Co, 13Cr, 2.1W, 3.8Mo, 0.9Nb, 3.4Al, 3.7Ti, 0.05C, 0.03B, 0.05Zr, Ni. Alloy powder is produced by argon atomization. After the powder is degassed, packaged and welded, it is densified by hot isostatic pressing and isothermally forged. The round cake blanks are then heat treated. Two different heating systems were selected during the solution heating process, solution heating treatment 1: the room temperature was raised to a solution temperature of 1170 ° C at an average heating rate of 3 ° C / min, and after 3 hours of heat preservation, oil quenching; solution heating treatment 2 : The room temperature is heated up to 1020°C at a heating rate of 3°C / min, and the difference between the temperature and the solution temperature is 150°C, and then the temperature is raised to 1170°C at a rate of 50°C / min. After holding for 3 hours, oil quenching.

[0048] Solution heat treatment 1: maximum grain si...

Embodiment 3

[0055] Material: nickel-based powder superalloy, chemical composition (wt%) is 21Co, 13Cr, 2.1W, 3.8Mo, 0.9Nb, 3.4Al, 3.7Ti, 0.05C, 0.03B, 0.05Zr, Ni. Alloy powder is produced by argon atomization. After the powder is degassed, packaged, sealed and welded, it is densified by hot isostatic pressing. Bars are prepared by extrusion, and forged into forgings by isothermal forging. Round bar samples are cut from the forgings and subjected to induction heating. Treatment, choose 2 different heating systems in the solid solution heating process, solid solution heating treatment 1: the room temperature is heated to 1020 °C at an average heating rate of 3.5 °C / min, and the difference between the solution temperature and the solution temperature is 150 °C, Then heat up to the solid solution temperature of 1170 °C at 30 °C / min, and air cool after 4 hours of heat preservation; solid solution heat treatment 2: room temperature is heated to 1020 °C at a heating rate of 3.5 °C / min, and then h...

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Abstract

The invention belongs to the field of material science and engineering, and particularly relates to a method for improving grain size distribution uniformity of powder high-temperature alloy. According to the method, after the powder high-temperature alloy is subjected to deformation treatment, by controlling the heat treatment process, the grain size distribution uniformity of the powder high-temperature alloy can be further improved; by optimizing the heat treatment process, the effective control over the alloy grain size uniformity can be realized, and then the powder high-temperature alloywith more excellent performance can be obtained; and the reason is that under the condition that initial grain tissues are the same, the powder high-temperature alloy is heated to the same solution temperature, the heat preservation is carried out for the same time period, as the heating rate is increased, the obtained alloy average grain size becomes larger, the size distribution uniformity is increased, the uniformity of the grain size is increased, the width of the size distribution is narrowed, that is, the difference between grain sizes is reduced, and the consistency is increased.

Description

technical field [0001] The invention belongs to the field of material science and engineering, in particular to a method for improving the distribution uniformity of powder superalloy grain size. Background technique [0002] High-temperature alloys have good oxidation resistance, corrosion resistance, excellent tensile properties, durability, fatigue properties and long-term structural stability. They were developed to meet the requirements of modern aerospace technology under various high-temperature conditions. The field of advanced aerospace engines shows strong vitality. Powder metallurgy superalloy is a superalloy prepared by powder metallurgy. Compared with traditional casting and forging superalloys, it has the advantages of uniform structure, no macro segregation, high yield strength and good fatigue performance, and overcomes the segregation caused by conventional processes. , can improve the overall performance of the alloy, and can reduce the amount of cutting a...

Claims

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Application Information

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IPC IPC(8): C22F1/10C21D6/00B22F3/24
CPCC22F1/10B22F3/24B22F2003/248C21D6/00
Inventor 田高峰陈阳王悦彭子超王旭青邹金文
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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