A precipitation strengthened iron-based superalloy and its preparation method

An iron-based superalloy, precipitation strengthening technology, applied in the field of high-temperature metal structural materials, can solve the problems of high cost, unsuitable power plant boiler material selection, instability and other problems of nickel-based superalloys, and achieve excellent high-temperature durable strength performance and excellent durable strength Performance, the effect of improving the durability of the alloy

Active Publication Date: 2021-12-21
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 high cost of nickel-based superalloys is not suitable for the selection of power plant boilers
Although iron-based superalloys have low cost and good processability, Ni 3 The Al phase is unstable in this type of alloy, and it is difficult to maintain a high volume fraction during high temperature service, so the ideal strengthening effect cannot be achieved

Method used

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  • A precipitation strengthened iron-based superalloy and its preparation method
  • A precipitation strengthened iron-based superalloy and its preparation method
  • A precipitation strengthened iron-based superalloy and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0032] By reasonably screening the contents of Ni, Al, and Ti elements and controlling their relative proportions, it is ensured that the alloy can still maintain a high volume fraction of Ni during service 3The presence of Al particles leads to good durable strength properties. The alloy is smelted in a vacuum induction furnace, and the obtained alloy includes: Ni: 36%, Cr: 17%, Mn: 1.0%, Si: 0.5%, C: 0.06%, Mo: 0.8%; W: 0.4% , Ti: 2.1%; Al: 1.4%, and the balance is Fe.

[0033] It adopts vacuum melting and casting molding, and homogenizes at 1170°C for 30 hours, and then conducts thermal deformation at 1050°C. The total deformation amount is not less than 60%, and the final pass deformation amount is higher than 25%. After deformation, solution treatment was carried out at 1100°C for 1 hour and cooled in air, followed by aging at 650°C and 750°C for 8 hours and 4 hours respectively and water cooling.

[0034] figure 1 It is the structure morphology of the alloy after heat...

Embodiment 2

[0038] The alloy is smelted in a vacuum induction furnace to obtain the alloy. The alloy includes: Ni: 25%, Cr: 19%, Co: 1%, Si: 0.1%, C: 0.03%, Mo: 0.5%. ; W: 0.5%, Ti: 2.1%; Al: 1.4%, and the balance is Fe.

[0039] It adopts vacuum melting and casting molding, and homogenizes at 1100°C for 50 hours, and then performs thermal deformation at 1020°C. The total deformation amount is not less than 60%, and the final pass deformation amount is higher than 25%. After deformation, solution treatment was carried out at 1080°C for 1 hour and cooled in air, followed by aging at 650°C for 20 hours and water cooled.

Embodiment 3

[0041] The alloy is smelted in a vacuum induction furnace to obtain an alloy, which includes: Ni: 37%, Cr: 18%, Co: 2%, Si: 0.2%, C: 0.1%, Mo: 0.4% ; W: 0.3%, Ti: 2.4%; Al: 1.2%, and the balance is Fe.

[0042] It adopts vacuum melting and casting molding, and homogenizes at 1130°C for 45 hours, and then conducts thermal deformation at 1120°C. The total deformation amount is not less than 60%, and the final pass deformation amount is higher than 25%. After deformation, solution treatment was carried out at 1090°C for 0.8 hours and cooled in air, followed by aging at 800°C for 8 hours and water cooled.

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Abstract

The invention discloses a precipitation-strengthened iron-based superalloy and a preparation method thereof, comprising Ni: 25-37%, Cr: 15-19%, Co: ≤2.0%, Mn: ≤1.0%, Si : ≤0.5%, C: 0.03‑0.10%, Mo+W: ≤1.2%, Ti+Al: 3.0‑3.8%, and the balance is Fe. Wherein, 2≥Ti / Al≥1.5, and when the Ni content does not exceed 30%, the Al content is not less than 1.4%. The alloy has excellent high-temperature durability performance, and the grain size after deformation and heat treatment meets 70‑125 μm, and its durability at 700°C / 180MPa, 725°C / 130MPa and 775°C / 100MPa is all higher than 3500 hours. The iron-based superalloy of the invention has excellent durable strength performance and low material cost.

Description

technical field [0001] The invention relates to the technical field of high-temperature metal structural materials, in particular to a precipitation-strengthened iron-based superalloy and a preparation method thereof. Background technique [0002] Coal-fired thermal power units provide more than 70% of domestic electricity, but domestic thermal power units have low average power generation efficiency and high energy consumption, and are the main emission sources of sulfur dioxide, nitride NOx, carbon dioxide and mercury. With the improvement of environmental protection requirements, it is necessary to significantly reduce and reduce the carbon dioxide emissions per unit of GDP. In the field of coal power, adopting high-parameter and large-capacity thermal power units is one of the most direct, economical and effective measures to realize the clean and efficient utilization of coal. At present, countries all over the world are actively developing 700°C advanced ultra-supercr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/52C22C38/02C22C38/04C22C38/44C22C38/50C22C38/06C22C30/00C21D8/00
CPCC22C38/52C22C38/02C22C38/04C22C38/44C22C38/50C22C38/06C22C30/00C21D8/005C21D2211/001C21D2211/004
Inventor 袁勇严靖博谷月峰张鹏杨征张醒兴
Owner HUANENG POWER INT INC
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