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Method for quantitatively evaluating influence of vacuum degree and oxidation products on high-temperature alloy performance

A technology of oxidation products and superalloys, applied in the direction of applying stable tension/pressure to test material strength, testing metals, measuring devices, etc., can solve problems such as the degree of vacuum and the sensitivity of oxidation products to the mechanical properties of superalloys

Active Publication Date: 2020-08-18
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention is a method for quantitatively evaluating the influence of vacuum degree and oxidation products on the mechanical properties of superalloys. The method solves the problem that the sensitivity of vacuum degree and oxidation products to the mechanical properties of superalloys cannot be quantitatively measured in the past.

Method used

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Examples

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Embodiment 1

[0032] The specific steps of adopting the technical solution of the present invention are as follows:

[0033] (1) The superalloy master alloy ingot is prepared by vacuum induction melting, and the alloy composition is Ni-34%Cr-5%W-3%Mo-1%Nb-1%Ti-1%Al-0.5%C, taking 50kg;

[0034] (2) Put the cut mother alloy ingot into a vacuum induction furnace for remelting, and place the alloy melt under normal vacuum conditions -1 Pa, maintained for 20min, the alloy was cooled and solidified to room temperature after pouring, and the superalloy sample under normal remelting vacuum condition was obtained;

[0035] (3) The gas test sample and the standard mechanical property test bar are respectively cut from the remelted and solidified superalloy sample, and the gas content and mechanical property test are carried out. The oxygen content in the gas content is 12ppm, the nitrogen content is 27ppm, the room temperature tensile strength of the alloy is 785.5MPa, the elongation is 19.2%, and th...

Embodiment 2

[0040] The specific steps of adopting the technical solution of the present invention are as follows:

[0041] (1) Prepare a superalloy master alloy ingot by vacuum induction melting, the alloy composition is Ni-34%Cr-5%W-3%Mo-1%Nb-1%Ti-1%Al-0.5%C, take 100kg;

[0042] (2) Put the cut mother alloy ingot into a vacuum induction furnace for remelting, place the alloy melt in a vacuum of 100Pa after dissolving, keep it for 1min, cool and solidify the alloy to room temperature after pouring, and obtain a 100Pa / 1min remelting vacuum condition of superalloy samples;

[0043] (3) The gas test sample and the standard mechanical property test bar are respectively cut from the remelted and solidified superalloy sample, and the gas content and mechanical property test are carried out. The oxygen content in the gas content is 15ppm, the nitrogen content is 21.5ppm, and the room temperature impact toughness of the alloy is 25.5J / cm 2 , 800℃ / 206MPa long-lasting life is 41.5h;

[0044] (4...

Embodiment 3

[0048] The specific steps of adopting the technical solution of the present invention are as follows:

[0049] (1) The superalloy master alloy ingot is prepared by vacuum induction melting, and the alloy composition is Ni-34%Cr-5%W-3%Mo-1%Nb-1%Ti-1%Al-0.5%C, taking 50kg;

[0050] (2) put the cut mother alloy ingot into a vacuum induction furnace for remelting, put the alloy melt into a vacuum condition of 100-110Pa after dissolving, keep it for 10min, cool and solidify the alloy to room temperature after pouring, and obtain a normal remelting vacuum condition high temperature alloy samples under the

[0051] (3) The gas test sample and the standard mechanical property test bar are respectively cut from the remelted and solidified superalloy sample, and the gas content and mechanical property test are carried out. The oxygen content in the gas content is 14.5ppm, the nitrogen content is 22.5ppm, the room temperature tensile strength of the alloy is 798MPa, the elongation is 6....

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Abstract

The invention discloses a method for quantitatively evaluating the influence of vacuum degree and oxidation products on high-temperature alloy performance, and belongs to the field of high-temperaturealloys. The method comprises the steps of controlling the grading vacuum degree during smelting, solidifying and gathering the oxidation products in sequence, and testing the comprehensive mechanicalproperty of the corresponding state in a matched mode; quantitatively evaluating the vacuum degree, the oxidation product and the influence of the oxidation product on the mechanical property of thenickel-based superalloy. Meanwhile, the type and the content of trace oxidation products in the alloy can be determined, a basis is provided for determination of preparation process parameter tolerance, and technical support and guarantee are provided for preparation of high-purity high-temperature alloy, improvement of the percent of pass of nickel-based high-temperature alloy parts and reductionof cost. The problems that in the prior art, only the vacuum degree, the average gas content (including the oxygen content) of a solidified sample and the alloy mechanical property are considered, and consequently the average gas content and the mechanical property cannot be directly hooked are solved.

Description

technical field [0001] The invention relates to a method for quantitatively evaluating the influence of vacuum degree and oxidation products on the properties of superalloys, belonging to the field of superalloys. Background technique: [0002] Superalloys, known as the heart of gas turbines, have long attracted the attention of metallurgists. At present, the preparation process of core hot-end components such as powder superalloy turbine disks and single crystal superalloy blades for advanced gas turbine engines requires alloy remelting and casting. The remelting vacuum degree and holding time have an impact on the quality and final service of the components Performance is critical. In the process of development and production, it is necessary to formulate corresponding processes for different parts, and the vacuum degree requirements during remelting are usually required in the process specification. Occasionally, vacuum system failures are encountered during the fabrica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/207G01N23/2251G01N33/202G01N33/2025G01N33/204G01N3/28G01N3/18G01N1/28
CPCG01N23/2076G01N23/2251G01N33/202G01N33/2025G01N33/204G01N3/18G01N3/28G01N1/28G01N2223/1016G01N2223/102G01N2223/624Y02P10/25
Inventor 郑亮肖程波张国庆
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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