Deformation high-temperature alloy capable of forming composite corrosion-resistant layer and preparation process of deformation high-temperature alloy

A technology of deformed superalloy and preparation process, which is applied in key components of high-temperature gas-cooled reactors, hydrogen production conversion furnace, deformed superalloy and its preparation process, thermal power advanced ultra-supercritical unit over/reheater field, and can solve Z-phase Problems such as grain boundary nucleation, harmful alloy processing performance, unfavorable alloy coal ash corrosion resistance, etc., achieve excellent high temperature strength, improved stability, and excellent protection effect

Inactive Publication Date: 2020-07-10
CHINA HUANENG GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of Mo element is not conducive to the coal ash corrosion resistance of the alloy, so it is necessary to ensure that the alloy has sufficient content of corrosion-resistant elements such as Al and Cr
However, pure Al 2 o 3 The layer is unstable in the coal ash corrosion environment, so the alloy needs to ensure sufficient Cr content, but this will

Method used

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  • Deformation high-temperature alloy capable of forming composite corrosion-resistant layer and preparation process of deformation high-temperature alloy
  • Deformation high-temperature alloy capable of forming composite corrosion-resistant layer and preparation process of deformation high-temperature alloy
  • Deformation high-temperature alloy capable of forming composite corrosion-resistant layer and preparation process of deformation high-temperature alloy

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Experimental program
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Effect test

Embodiment 1

[0039] While ensuring the strength performance of the alloy, the addition of W, Nb and other elements is limited to improve its processing performance. Using a vacuum induction furnace to melt the alloy, the obtained alloy includes: Cr: 16%, Co: 15%, Ti: 1.1%, Al: 4.1%, Si: 0.3%, Mn: 0.3%, Nb: 1.0 %, 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%.

[0040] Homogenize the alloy at 1160°C for 24 hours, then roll it at 100°C above the γ' melting temperature, the total deformation is 95%, and the deformation in each pass is not less than 30%. During the heating process of alloy homogenizat...

Embodiment 2

[0045] While ensuring the strength performance of the alloy, the addition of W, Nb and other elements is limited to improve its processing performance. Using a vacuum induction furnace to melt the alloy, the obtained alloy includes: Cr: 17%, Co: 10%, Ti: 1.5%, Al: 4.0%, Si: 0.2%, Mo: 5.0%, Mn: 0.2 %, Nb: 1.0%, 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%.

[0046] Homogenize the alloy at 1200°C for 24 hours, then roll it at 100°C above the γ' melting temperature, the total deformation is 70%, and the deformation in each pass is not less than 25%. During the heating process of alloy h...

Embodiment 3

[0051] 1) Alloy smelting: by mass percentage, Cr: 16%, Co: 15%, Ti: 1.5%, Al: 3.5%, W: 0.5%, Mo: 3.0%, Si: 0.3%, Mn: 0.1% , Nb: 0.5%, C: 0.04%, and the balance is Ni; put it into a vacuum induction furnace, carry out alloy smelting and refining under the protection of vacuum and argon, and finally obtain an alloy ingot; the quality of N element in the alloy ingot is 100% The content of P and S is not higher than 0.03%, and the mass percentage content of P and S is not higher than 0.03%.

[0052] 2) High-temperature rolling: After the alloy ingot is raised to 950°C at a heating rate of 10°C / min and held for 1.0 hour, the alloy ingot is homogenized at 1160°C for 72 hours, and then its exterior is coated with a thickness of 0.5 -1.0mm 304 stainless steel jacket, in Ni 3 High-temperature rolling is carried out at 50°C above the Alγ’ dissolution temperature, and the deformation amount of each pass is not less than 25%, and the total deformation amount is not less than 70%.

[005...

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Abstract

The invention discloses a deformation high-temperature alloy capable of forming a composite corrosion-resistant layer and a preparation process of the deformation high-temperature alloy. The deformation high-temperature alloy is prepared from the components in percentage by mass: 16-19% of Cr, 10-15% of Co, 0.5-1.5% of Ti, 3.5-4.5% of Al, less than or equal to 0.5% of W, less than or equal to 5.0%of Mo, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 0.5-1.0% of Nb, 0.04-0.07% of C and the balance of Ni. The preparation process comprises the steps of homogenization treatment after smelting; hot rolling; and final heat treatment. The room temperature and 850 DEG C tensile yield strengths of the alloy are higher than 820 MPa and 520 MPa correspondingly, meanwhile, the deformation high-temperature alloy has excellent processing performance and tissue stability, no harmful phase is separated out during heat exposure of 850 DEG C, and the room temperature and 850 DEG Ctensile yield strengths after heat exposure for 1350 h under the temperature are higher than 630 MPa and 370 MPa correspondingly.

Description

technical field [0001] The invention belongs to the field of high-temperature alloys, and specifically relates to a deformed high-temperature alloy capable of forming a composite corrosion-resistant layer and a preparation process thereof. Cold stack key components, etc. 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 materials is the most important factor restricting the improvement of steam parameters of boi...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/02C22F1/10
CPCC22C1/023C22C19/056C22F1/10
Inventor 严靖博杨征张醒兴谷月峰袁勇党莹樱
Owner CHINA HUANENG GRP CO LTD
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