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Preparation process for nickel-based high-tungsten polycrystalline high-temperature alloy

A high-temperature alloy and preparation technology, which is applied in the field of preparation technology of nickel-based high-tungsten polycrystalline superalloy, can solve the problems of reducing the thermal processing performance of the alloy, adversely affecting the corrosion resistance of the alloy, and increasing the difficulty of alloy preparation and molding, etc., to achieve The effect of excellent strength and good processability

Active Publication Date: 2020-07-14
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 process for nickel-based high-tungsten polycrystalline high-temperature alloy
  • Preparation process for nickel-based high-tungsten polycrystalline high-temperature alloy
  • Preparation process for nickel-based high-tungsten polycrystalline high-temperature alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The nickel-based high tungsten polycrystalline superalloy material (heat-resistant steel) of the present embodiment comprises by mass percentage: Cr: 17%, Co: 20%, Ti: 1.5%, Al: 4.5%, W: 8.5%, Si: 0.2%, Mn: 0.3%, Nb: 1.0%, C: 0.07%, the balance is Ni;

[0040] The preparation method of this embodiment includes four steps of alloy smelting, forging billet opening, high temperature rolling and heat treatment:

[0041]1) Alloy smelting: Vacuum induction melting furnace is used to smelt the prepared alloy raw materials. When the vacuum degree reaches 0.35P, high-purity argon gas is introduced and smelted, and then refined by electroslag remelting process to reduce the content of inclusions. 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 hig...

Embodiment 2

[0048] The nickel-based high-tungsten polycrystalline superalloy material in this embodiment comprises: Cr: 17%, Co: 20%, Ti: 1.0%, Al: 4.0%, W: 7.0%, Si: 0.2%, Mn: 0.3%, Nb: 1.5%, C: 0.07%, the balance is Ni;

[0049] The preparation method of this embodiment includes four steps of alloy smelting, forging billet opening, high temperature rolling and heat treatment:

[0050] 1) Alloy smelting: Vacuum induction melting furnace is used to smelt the prepared alloy raw materials. When the vacuum degree reaches 0.35P, high-purity argon gas is introduced and smelted, and then refined by electroslag remelting process to reduce the content of inclusions. 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%, and the N element content is not...

Embodiment 3

[0055] A preparation process of a nickel-based high-tungsten polycrystalline superalloy comprises the following steps:

[0056] 1) Alloy melting: by mass percentage, Cr: 15%, Co: 18%, Ti: 0.5%, Al: 4.5%, W: 8.0, Si: 0.5%, Mn: 0.1%, Nb: 0.5%, C: 0.08%, the balance is Ni, using magnesium oxide basic furnace lining, smelting under the vacuum degree of 0.3-0.5Pa and under the protection of argon, and then refining by electroslag remelting process to obtain ingots;

[0057] 2) Forging blanking: heat the ingot from room temperature to 900°C at a rate of 10°C / min and keep it warm for 1.0 hour, then perform homogenization treatment at 1160°C, and forge blanking at 1180°C after completion, the deformation of each pass 5%, the total deformation is not less than 60%; after each pass of forging is completed, return to the furnace for heat preservation, and the heat preservation time T and the time outside the furnace t satisfy 5t≤T≤10t.

[0058] 3) High-temperature rolling: heat the roll...

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Abstract

The invention relates to a preparation process for a nickel-based high-tungsten polycrystalline high-temperature alloy. The preparation process comprises the following steps that alloy smelting is carried out, specifically, the following components of, in percentage by mass, 15%-18% of Cr, 15%-20% of Co, 0.5%-1.5% of Ti, 3.5%-4.5% of Al, 7.0%-8.5% of W, less than or equal to 0.5% of Si, less thanor equal to 0.5% of Mn, 0.5%-1.5% of Nb, 0.03%-0.08% of C, and the balance Ni are smelted under the vacuum degree of 0.3-0.5 Pa and the protection of argon, and then refining is carried out by adopting an electroslag remelting process to obtain a ingot casting; then hammer cogging is carried out; high-temperature rolling is carried out; and final heat treatment is carried out. According to the preparation process, the alloy is completely recrystallized after being subjected to heat treatment, the grain size of the alloy is 30-50 mm, Ni3Al phases are dispersedly distributed in a crystal, the volume fraction of the Ni3Al phases is not lower than 35%, and the yield strength of the alloy is not lower than 700 MPa under the condition of 850 DEG C.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
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鲁金涛
Owner CHINA HUANENG GRP CO LTD
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