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Precipitation strengthening type nickel-based high-chromium high-temperature alloy and preparation method thereof

A superalloy and precipitation strengthening technology, applied in the field of precipitation-strengthened nickel-based high-chromium superalloy and its preparation, can solve the problems of corrosion resistance, reduce alloy strength, deteriorate microstructure stability, etc., achieve excellent oxidation resistance, excellent The effect of strength properties and corrosion resistance, excellent tissue stability

Active Publication Date: 2019-08-06
CHINA HUANENG GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since a higher Cr content will reduce the strength of the alloy and deteriorate the structural stability, the content of Cr in the commonly used precipitation-strengthened nickel-based superalloys is often controlled in a lower range, but at the same time, its corrosion resistance is greatly affected

Method used

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  • Precipitation strengthening type nickel-based high-chromium high-temperature alloy and preparation method thereof
  • Precipitation strengthening type nickel-based high-chromium high-temperature alloy and preparation method thereof
  • Precipitation strengthening type nickel-based high-chromium high-temperature alloy and preparation method thereof

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preparation example Construction

[0029] A method for preparing a precipitation-strengthened nickel-based high-chromium superalloy, comprising the following steps:

[0030] 1) Alloy preparation: Alloy components meet the following requirements in terms of mass percentage: Cr: 25-28%, Co: 10-15%, Ti: 2.5-3.5%, Al: 1.0-1.5%, W: 1.5-5%, Si: ≤0.5%, Mn: ≤0.5%, Nb: 0.5~1.5%, C: 0.03~0.08%, Fe: 0.5~1.0%, the balance is Ni, among which, Ti / Al<2.5;

[0031] 2) Smelting: Melt the prepared alloy into alloy mother liquor, then use electroslag remelting process to refine, cool, after the alloy mother liquor is solidified into ingot and before the ingot temperature reaches 900°C, control the cooling rate not to exceed 15°C / min , after the ingot temperature reaches 900°C, it is cooled to room temperature at a cooling rate exceeding 10°C / min; the time from the solidification of the alloy mother liquor into the ingot to the cooling to room temperature does not exceed 15 minutes.

[0032] 3) Homogenization treatment: Take out ...

Embodiment 1

[0036]The heat-resistant steel material of this embodiment comprises: Cr: 28%, Co: 15%, Ti: 2.5%, Al: 1.5%, W: 1.5%, Si: 0.5%, Mn: 0.5%, Nb: 0.5%, C: 0.04%, Fe: 0.5%, the balance is Ni;

[0037] The preparation method of the present embodiment comprises the following steps:

[0038] 1) Raw material preparation: The ingredients include by mass percentage: Cr: 28%, Co: 15%, Ti: 2.5%, Al: 1.5%, W: 1.5%, Si: 0.5%, Mn: 0.5%, Nb: 0.5% %, C: 0.04%, Fe: 0.5%, the balance is Ni;

[0039] 2) Melting step: place the ceramic crucible and prepared raw materials in a vacuum melting furnace at the same time, and use a vacuum induction furnace at a vacuum degree not higher than 1.0×10 -4 Under MPa, the prepared alloy is smelted into alloy mother liquor, and when the alloy mother liquor is solidified, an electric arc is used to preheat the ceramic crucible at low power. After the alloy is completely solidified into an ingot, it is moved to a preheated ceramic crucible to prevent the alloy i...

Embodiment 2

[0045] The heat-resistant steel material of this embodiment includes by mass percentage: Cr: 25%, Co: 15%, Ti: 2.5%, Al: 1.5%, W: 5%, Si: 0.5%, Mn: 0.5%, Nb: 0.5%, C: 0.07%, Fe: 0.5%, the balance is Ni;

[0046] The preparation method of the present embodiment comprises the following steps:

[0047] 1) Raw material preparation: The ingredients include by mass percentage: Cr: 25%, Co: 15%, Ti: 2.5%, Al: 1.5%, W: 5%, Si: 0.5%, Mn: 0.5%, Nb: 0.5% %, C: 0.07%, Fe: 0.5%, the balance is Ni;

[0048] 2) Melting step: place the ceramic crucible and prepared raw materials in a vacuum melting furnace at the same time, and use a vacuum induction furnace at a vacuum degree not higher than 1.0×10 -4 Under MPa, the prepared alloy is smelted into alloy mother liquor, and when the alloy mother liquor is solidified, an electric arc is used to preheat the ceramic crucible at low power. After the alloy is completely solidified into an ingot, it is moved to a preheated ceramic crucible to prev...

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Abstract

The invention discloses a precipitation strengthening type nickel-based high-chromium high-temperature alloy and a preparation method thereof. The precipitation strengthening type nickel-based high-chromium high-temperature alloy comprises the following components of, in percentage by mass, 25%-28% of Cr, 10%-15% of Co, 2.5%-3.5% of Ti, 1.0%-1.5% of Al, 1.5%-5% of W, less than or equal to 0.5% ofSi, less than or equal to 0.5% of Mn, 0.5%-1.5% of Nb, 0.03%-0.08% of C, 0.5%-1.0% of Fe, and the balance Ni; the prepared alloy is smelted to obtain an alloy mother solution, refining is performed byadopting by adopting an electroslag remelting process, cooling is performed, and the alloy mother solution is solidified into a cast ingot; and rolling is performed after homogenization treatment isperformed, and heat treatment is performed. An alloy design idea of precipitation strengthening is adopted, good strength performance of the alloy is obtained by promoting secondary strengthening phase of a large amount of uniformly dispersed distribution in the alloy, meanwhile, the alloy has relatively high Cr element content on the premise of ensuring the stability of the alloy structure, and then excellent oxidation resistance and corrosion resistance are obtained.

Description

technical field [0001] The invention belongs to the field of high-temperature alloy materials, and in particular relates to a precipitation-strengthened nickel-based high-chromium high-temperature alloy and a preparation method thereof. Background technique [0002] As my country's electricity demand continues to increase, energy shortages and environmental pollution problems have become increasingly prominent, and the need to develop high-efficiency, energy-saving, and environmentally friendly power generation methods has become increasingly urgent. Thermal power generation has been the most important power generation technology in my country for a long time, and improving the steam parameters of the unit is considered to be the most effective way to solve the above problems. A lot of practice in the past has shown that the service performance of key component materials is the most important factor restricting the improvement of steam parameters of boiler units. Service pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10
CPCC22C19/055C22C1/023C22F1/10
Inventor 严靖博谷月峰袁勇杨征张醒兴
Owner CHINA HUANENG GRP CO LTD