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A high-strength superalloy for thermal power units and its processing technology

A technology for superalloys and thermal power units, applied in the field of materials and material preparation, can solve the problems of poor structure stability and corrosion resistance, low thermal strength, high performance, etc., and achieve the effect of excellent high temperature strength performance

Active Publication Date: 2021-11-16
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with nickel-based deformed superalloys, although the above-mentioned iron-nickel-based superalloys have advantages in raw material cost, they have low thermal strength, poor structural stability and poor corrosion resistance.
At the same time, since deformation processing is still required to obtain the structure and properties required for service, the preparation and processing technology is complicated, which makes the overall manufacturing cost higher and it is more difficult to further improve the performance

Method used

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  • A high-strength superalloy for thermal power units and its processing technology
  • A high-strength superalloy for thermal power units and its processing technology
  • A high-strength superalloy for thermal power units and its processing technology

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Experimental program
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Effect test

preparation example Construction

[0028] The preparation process flow of the above alloy mainly includes alloy smelting, deformation, and heat treatment three steps, as follows:

[0029] (1) Smelting, homogenization treatment: The above-mentioned alloy is melting the induced electric arc furnace. The induction electric arc furnace is used to magnesium oxide alkaline furnace lining, and the pure nickel washing furnace is used before melting. Within 0.3-0.5Pa, CR, NI, W, Si, Mn, Mo, and Fe are completely melted after the alloy, and then GM, then Gas, Ti, B, Zr, and C, and cast; after solidification, the ingot is homogenized in the range of 1050-1120 ° C for 24-72 hours after air cooling to room temperature;

[0030] (2) Forging blank: The alloy of step (1) smelting and homogenization treatment is sanded over from γ 'precipitation temperature above 200-250 ° C, and the amount of deformation per second is not less than 30%, the final total deformation amount Not less than 70%;

[0031] (3) High temperature rolling: Th...

Embodiment 1

[0037] Thermal power according to the present embodiment is a high strength superalloy, in percentage by mass comprising: C: 0.06%, Cr: 16%, Mn: 0.2%, Si: 0.15%, W: 1.6%, Mo: 1.2%, Ti: 2.2 %, Al: 1.4%, B: 0.002%, Zr: 0.02%, Fe: 37%, the balance is Ni.

[0038] Basic lining alloy melting magnesium oxide, before the melting furnace using pure nickel washing, shot blasting treatment before addition of alloy materials. Induction arc melting the alloy, the degree of vacuum of 0.35 Pa at control, until Cr, Ni, W and other elements is completely melted and refined 40min, and prior to addition of Al, Ti, B, Zr, C into high purity argon gas protection. Cr, Ni, W, etc. alloy materials added after deoxidation coke completely melted, added mass does not exceed the alloy material containing 50% by mass of elements C, was added after completion of the second Ni-Mg alloy is deoxy, and finally adding Al, Ti, B , Zr, C and other elements easy burning, released after stirring for 5min, which castin...

Embodiment 2

[0042] High-strength superalloy according to the present embodiment, the percentage by mass comprising: C: 0.07%, Cr: 15%, Mn: 0.2%, Si: 0.15%, W: 2.2%, Mo: 0.4%, Ti: 2.2%, Al: 1.4%, B: 0.002%, Zr: 0.02%, Fe: 47%, the balance is Ni. Basic lining alloy melting magnesium oxide, before the melting furnace using pure nickel washing, shot blasting treatment before addition of alloy materials. Induction arc melting the alloy, the degree of vacuum of 0.35 Pa at control, until Cr, Ni, W and other elements is completely melted and refined 40min, and prior to addition of Al, Ti, B, Zr, C into high purity argon gas protection. Cr, Ni, W, etc. alloy materials added after deoxidation coke completely melted, added mass of not more than 40% C alloy material containing the element mass, after the completion of addition of the second Ni-Mg alloy was deoxygenated and finally Al, Ti, B , Zr, C and other elements easy burning, released after stirring for 5min, which casting temperature 1650 ℃. Alloy ...

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Abstract

A high-strength superalloy for thermal power units and its processing technology. The superalloy components include: C: 0.05-0.08%, Cr: 14-17%, Mn: ≤0.5%, Si: ≤0.5%, W: 1.0-2.5%, Mo: 0.3-2.0%, Ti: 2.0-2.5%, Al: 1.0-1.5%, B: ≤0.003%, Zr: ≤0.03%, Fe: 37-48%, and Ni. Use an electric arc furnace to smelt the pre-assembled alloy charge under a vacuum degree of no more than 0.5Pa; 3 In the temperature range of 200-250°C above the Al(γ’) precipitation temperature, the alloy is subjected to open billet forging with a deformation amount of 70%; at 150-200°C above the γ’ precipitation temperature, high-temperature rolling is performed with a deformation amount of 80%. The alloy has excellent high-temperature mechanical properties above 650 °C.

Description

Technical field [0001] The present invention belongs to the field of material and material preparation, and more particularly to a high-strength high-temperature alloy with a thermoforming unit and its processing processes. It can meet the processing and use performance requirements of the material of the main steam pipeline of 700 ° C advanced super-critical thermal electrical unit. Background technique [0002] With the increasing demand for electricity in my country, energy shortage and environmental pollution problems are increasing, developing efficient, energy saving, and environmentally friendly power generation. The fire power generation is the most important power generation technology in my country, and the steam parameters of the unit are considered to be the most effective way to solve the above problems. In the past, a large number of practices show that the service performance of key component materials is the most important reason for the increase in the steam para...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02C22C33/04B22D27/00C21C7/10C21D8/00C21D1/00C22F1/10
CPCC22C30/00C22C19/056C22C38/54C22C38/50C22C38/44C22C38/06C22C38/04C22C38/02C22C1/023C22C33/04B22D27/00C21C7/10C21D8/005C21D1/00C22F1/10C21D6/004C21D1/26C21D7/13C21D1/78C21D9/0081B22D21/025C22C38/00
Inventor 严靖博杨征谷月峰袁勇孙宇明张兴营刘茜
Owner HUANENG POWER INT INC
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