Processing and forming technology of a high-strength nickel-based superalloy rod

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...

Examples

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...

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...

Examples

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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