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High-strength corrosion-resistant nickel-based polycrystalline high-temperature alloy and preparation method thereof

A high-temperature alloy and corrosion-resistant technology, which is applied in the field of key components, high-strength corrosion-resistant nickel-based polycrystalline superalloy and its preparation, can solve problems such as poor Al element, inability to protect the substrate, loss of stability of the oxide layer, etc., and achieve excellent high temperature Strength, improved corrosion/oxidation resistance, and good high-temperature structural stability

Inactive Publication Date: 2020-07-10
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in coal ash corrosion environment, with Al 2 o 3 The formation of Al is accompanied by the impoverishment of Al elements in the matrix, and when it reaches a certain level, the oxide layer loses its stability and cannot protect the matrix

Method used

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  • High-strength corrosion-resistant nickel-based polycrystalline high-temperature alloy and preparation method thereof
  • High-strength corrosion-resistant nickel-based polycrystalline high-temperature alloy and preparation method thereof
  • High-strength corrosion-resistant nickel-based polycrystalline high-temperature alloy and preparation method thereof

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preparation example Construction

[0032] The preparation method of the high-strength and corrosion-resistant nickel-based polycrystalline superalloy includes homogenization treatment after smelting, hot rolling and final heat treatment.

[0033] details as follows:

[0034] 1) Alloy smelting: use a vacuum induction furnace for alloy smelting, and ensure that the vacuum degree is lower than 5×10 before introducing high-purity argon -3 . Subsequently, the electroslag remelting process is used for refining, and finally the alloy ingot is obtained for processing; after electroslag remelting, the content of N element in the alloy is not higher than 300ppm, and the content of P and S is not higher than 0.03%.

[0035] 2) High-temperature rolling: heat the alloy to 950-1020°C for 0.5-1.0 hours, then homogenize it at 1160-1200°C for 24-72 hours, and finally heat it at 50-100°C above the γ' melting temperature High-temperature rolling, the total deformation is not less than 50%, and the deformation per pass is 10-20%...

Embodiment 1

[0041] Limit the content of Cr element in the alloy to less than 17% and increase the content of Al element to more than 5.0%. At the same time, avoid the addition of Mo element and limit the upper limit of Ti element content to no more than 0.5%. The composition meets the following requirements in terms of mass percentage: Cr: 17% , Co: 15%, Ti: 0.5%, Al: 5.0%, W: 7.0%, Si: 0.2%, Mn: 0.2%, Nb: 1.5%, C: 0.04%, and the balance is Ni. Vacuum induction furnace is used for alloy smelting, and the vacuum degree is lower than 5*10 before introducing high-purity argon. -3 . It is then refined using the electroslag remelting process, and finally an alloy ingot is obtained for processing. Ensure that the content of N element in the alloy after electroslag remelting is not higher than 300ppm, and the content of P and S is not higher than 0.03%.

[0042] The alloy is homogenized at 1200°C for 24 hours, and then rolled at a temperature of 70°C above the γ' melting temperature. The total...

Embodiment 2

[0047] Limit the content of Cr element in the alloy to below 17% and increase the content of Al element to above 5.0%. At the same time, avoid the addition of Mo element and limit the upper limit of Ti element content to no more than 0.5%. The composition meets the following requirements in terms of mass percentage: Cr: 16% , Co: 20%, Ti: 0.3%, Al: 5.1%, W: 7.0%, Si: 0.2%, Mn: 0.2%, Nb: 1.8%, C: 0.07%, and the balance is Ni. Vacuum induction furnace is used for alloy smelting, and the vacuum degree is lower than 5*10 before introducing high-purity argon. -3 . It is then refined using the electroslag remelting process, and finally an alloy ingot is obtained for processing. Ensure that the content of N element in the alloy after electroslag remelting is not higher than 300ppm, and the content of P and S is not higher than 0.03%.

[0048] The alloy is homogenized at 1200°C for 24 hours, and then rolled at a temperature of 70°C above the γ' melting temperature, with a total defo...

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Abstract

The invention relates to a high-strength corrosion-resistant nickel-based polycrystalline high-temperature alloy and a preparation method thereof. The alloy comprises the following components of, in percentage by mass, 13%-17% of Cr, 15%-20% of Co, 0.1%-0.5% of Ti, 5.0%-5.5% of Al, 3.0%-7.0% of W, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 1.5%-2.0% of Nb, 0.04%-0.07% of Cand the balance Ni. Homogenizing treatment is conducted after smelting is conducted, hot rolling is conducted and finally heat treatment is conducted. The alloy has excellent strength and corrosion resistance, and the tensile yield strength of the alloy at a room temperature and 850 DEG C is higher than 900 MPa and 680 MPa respectively, and the alloy has excellent processing performance and structure stability at the same time.

Description

technical field [0001] The invention belongs to the field of high-temperature alloys, and specifically relates to a high-strength, corrosion-resistant nickel-based polycrystalline high-temperature alloy and a preparation method thereof, and is especially suitable for key components such as over / reheaters of thermal power advanced ultra-supercritical units. 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 com...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22F1/10
CPCC22C19/056C22F1/10
Inventor 严靖博杨征谷月峰张兴营袁勇梁法光刘茜
Owner HUANENG POWER INTERNATIONAL
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