Processing and forming process of high-strength nickel-based high-temperature alloy bar

A high-temperature alloy, processing and forming technology, applied in the field of material processing, can solve the problems of increasing the red hardness of the alloy and the influence of the processing performance of the alloy, and achieve the effect of improving the structure of the alloy.

Active 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

However, the addition of the above elements will have a serious impact on the processing properties of the alloy. For example, the addition of W element...

Method used

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  • Processing and forming process of high-strength nickel-based high-temperature alloy bar
  • Processing and forming process of high-strength nickel-based high-temperature alloy bar
  • Processing and forming process of high-strength nickel-based high-temperature alloy bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]According to the alloy composition, the content of each element meets the following requirements in terms of mass percentage: Cr: 16%, Co: 20%, Al: 3.9%, Ti: 1.1%, Nb: 1.5%, W: 6.8%, Si: 0.15 %, Mn: 0.25%, C: 0.07%, and the balance is Ni. The alloy is smelted in an induction electric arc furnace with a magnesium oxide basic furnace lining. The furnace is washed with pure nickel before smelting, and the alloy raw material is shot blasted before being added. During alloy melting, the vacuum degree is controlled within the range of 0.35Pa. After Cr, Co, Ni, W, Nb and other elements are completely melted, it is refined for 40 minutes, and high-purity argon is introduced before adding Al, Ti, and C for protection. During the smelting process, coke and Ni-Mg are used for secondary deoxidation, and the content of P and S in the alloy is not higher than 0.03% after the smelting is completed.

[0042] The alloy ingot was heated at a rate of 10°C / min to 1000°C for 0.5 hours, then...

Embodiment 2

[0045] According to the alloy composition, the content of each element meets the following requirements in terms of mass percentage: Cr: 20%, Co: 15%, Al: 3.4%, Ti: 1.8%, Nb: 0.5%, W: 6.7%, Si: 0.10 %, Mn: 0.15%, C: 0.07%, and the balance is Ni. The alloy is smelted in an induction electric arc furnace with a magnesium oxide basic furnace lining. The furnace is washed with pure nickel before smelting, and the alloy raw material is shot blasted before being added. During alloy melting, the vacuum degree is controlled within the range of 0.35Pa. After Cr, Co, Ni, W, Nb and other elements are completely melted, it is refined for 40 minutes, and high-purity argon is introduced before adding Al, Ti, and C for protection. During the smelting process, coke and Ni-Mg are used for secondary deoxidation, and the content of P and S in the alloy is not higher than 0.03% after the smelting is completed.

[0046] The alloy ingot was heated at a rate of 10°C / min to 1000°C for 0.5 hours, the...

Embodiment 3

[0049] According to the alloy composition, the content of each element meets the following requirements in terms of mass percentage: Cr: 23%, Co: 15%, Al: 2.5%, Ti: 2.4%, Nb: 0.5%, W: 3.0%, Si: 0.2 %, Mn: 0.35%, C: 0.06%, and the balance is Ni. The alloy is smelted in an induction electric arc furnace with a magnesium oxide basic furnace lining. The furnace is washed with pure nickel before smelting, and the alloy raw material is shot blasted before being added. During alloy melting, the vacuum degree is controlled within the range of 0.35Pa. After Cr, Co, Ni, W, Nb and other elements are completely melted, it is refined for 40 minutes, and high-purity argon is introduced before adding Al, Ti, and C for protection. During the smelting process, coke and Ni-Mg are used for secondary deoxidation, and the content of P and S in the alloy is not higher than 0.03% after the smelting is completed.

[0050] Heat the alloy ingot at a rate of 10°C / min to 950°C and keep it warm for 0.5 h...

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Abstract

The invention relates to a processing and forming process of a high-strength nickel-based high-temperature alloy bar. The bar comprises the following components of, in percentage by mass, 16%-23% of Cr, 15%-20% of Co, 2.5%-4.0% of Al, 1.0%-2.5% of Ti, 0.5%-1.5% of Nb, 3.0%-7.0% of W+Mo, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 0.04%-0.07% of C, and the balance is Ni. Analloy is mainly in a dual phase structure of austenite and Ni3Al(gamma'), as well as M23C6 type carbides distributed discontinuously at a grain boundary. The alloy is prepared by adopting a vacuum smelting process, and then is forged into a bar by adopting a multi-pass small deformation mode, and finally surface turning and heat treatment are carried out on the bar. According to the process, deformation processing of the alloy with high content of W and Mo is conducted, and the final deformation of the alloy can reach 75% or higher while the strength of the alloy is considered.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a processing and forming process of high-strength nickel-based superalloy rods. 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 performance puts forward extremely high requirem...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/02C22C1/06C22F1/10
CPCC22C1/023C22C1/06C22C19/055C22C19/056C22F1/10
Inventor 严靖博杨征张醒兴张兴营谷月峰袁勇梁法光于在松
Owner HUANENG POWER INTERNATIONAL
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