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Preparation and molding process of a high-strength nickel-based superalloy

A nickel-based superalloy and forming process technology, which is applied in the field of high-strength nickel-based superalloy preparation and forming process, can solve the problems of reducing the thermal processing performance of the alloy, increasing the difficulty of alloy preparation and forming, and endangering the stability of the alloy structure, so as to achieve excellent strength Effect

Active Publication Date: 2021-06-29
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of Mo element will have an adverse effect on the corrosion resistance of the alloy and significantly endanger the stability of the alloy structure.
The solid solution strengthening effect of W element is more significant than that of Mo element, but its addition will significantly reduce the hot workability of the alloy, thereby increasing the difficulty of alloy preparation and forming

Method used

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  • Preparation and molding process of a high-strength nickel-based superalloy
  • Preparation and molding process of a high-strength nickel-based superalloy
  • Preparation and molding process of a high-strength nickel-based superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The heat-resistant steel material of this embodiment includes by mass percentage: Cr: 17%, Co: 20%, Ti: 1.5%, Al: 4.5%, W: 8.5%, Si: 0.2%, Mn: 0.3%, Nb: 1.5%, C: 0.06%, the balance being Ni;

[0035] The forming preparation process of this embodiment includes three steps of alloy smelting, billet forging and heat treatment:

[0036] 1) Alloy smelting: Vacuum induction melting furnace is used to smelt the prepared alloy raw materials, and when the vacuum reaches the range of 0.35Pa, high-purity argon gas is introduced and smelted. Among them, magnesium oxide basic furnace lining is used for alloy smelting, pure nickel is used to wash the furnace before smelting, and shot blasting is carried out before alloy raw materials are added to ensure that the P and S contents in the later stage of alloy smelting are not higher than 0.03%;

[0037] 2) Blank forging: heat the ingot at a rate of 10°C / min to 1200°C for homogenization treatment, and then carry out blank forging at 118...

Embodiment 2

[0043] The heat-resistant steel material of this embodiment includes by mass percentage: Cr: 16%, Co: 20%, Ti: 1.2%, Al: 4.2%, W: 10%, Si: 0.3%, Mn: 0.3%, Nb: 1.0%, C: 0.05%, the balance being Ni;

[0044] The preparation and molding process of this embodiment includes three steps of alloy smelting, billet forging and heat treatment:

[0045] 1) Alloy smelting: Vacuum induction melting furnace is used to smelt the prepared alloy raw materials, and when the vacuum reaches the range of 0.35Pa, high-purity argon gas is introduced and smelted. Among them, magnesium oxide basic furnace lining is used for alloy smelting, pure nickel is used to wash the furnace before smelting, and shot blasting is carried out before alloy raw materials are added to ensure that the P and S contents in the later stage of alloy smelting are not higher than 0.03%;

[0046] 2) Blank forging: heat the ingot at a rate of 10°C / min to 1200°C for homogenization treatment, and then carry out blank forging at ...

Embodiment 3

[0049] 1) Alloy smelting: vacuumize first, and then smelt the alloy raw material in a vacuum induction melting furnace with magnesium oxide basic furnace lining under the protection of argon to obtain ingots; wherein, the alloy raw material is calculated by mass percentage, including: Cr: 16%, Co: 20%, Ti: 0.5%, Al: 3.5%, W: 10%, Si: 0.5%, Mn: 0.5%, Nb: 0.5%, C: 0.03%, the balance is Ni;

[0050] 2) Blank forging: heat the ingot at 950°C for 1.5 hours, then heat the ingot from room temperature to 1180°C at a rate of 10°C / min for 15 hours, and then carry out blank forging at 1180°C. The amount of deformation for each time is 15%. After the billet forging is completed, it is returned to the furnace for heat preservation. The heat preservation time T and the time outside the furnace t satisfy 10t≤T, and the total deformation is not less than 70%;

[0051] 3) Heat treatment: heat the alloy after blank forging at 1150°C for 2.0 hours, then air cool at 980°C for 1.5 hours, then hold...

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Abstract

A preparation and molding process of a high-strength nickel-based superalloy, the alloy components meet the following range requirements in terms of mass percentage: Cr: 15-18%, Co: 15-20%, Ti: 0.5-1.5%, Al: 3.5-4.5%, W : 8.5~10%, Si: ≤0.5%, Mn: ≤0.5%, Nb: 0.5~1.5%, C: 0.03~0.08%, the balance is Ni; its preparation process includes alloy smelting, billet forging and heat treatment step. The incompletely recrystallized structure is obtained through high-temperature multi-pass small deformation forging. The obvious segregation phenomenon can still be seen inside the alloy after heat treatment, its grain size is 70-120mm, and the Ni 3 Al phase, and its volume fraction is not less than 35%. At the same time, the alloy has excellent high-temperature strength properties. Its yield strength at 850°C is not less than 700MPa, and the extrapolated durability at 850°C / 100MPa is not less than 100,000 hours.

Description

technical field [0001] The invention belongs to the field of high-temperature alloy materials, and in particular relates to a preparation and molding process of a high-strength nickel-based high-temperature alloy. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10C22C30/00B21J1/02
CPCB21J1/025C22C1/023C22C19/056C22C30/00C22F1/10
Inventor 严靖博杨征谷月峰张兴营袁勇梁法光于在松刘茜
Owner HUANENG POWER INT INC
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