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Nickel-based high-temperature alloy used for ultra-supercritical boiler and preparation method and application of nickel-based high-temperature alloy

A nickel-based superalloy and ultra-supercritical boiler technology, applied in the field of superalloy materials, can solve problems such as harsh service conditions, and achieve the effects of reducing degradation rate, reducing cost, and improving tensile strength

Active Publication Date: 2016-06-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering that the thermal efficiency of the unit is closely related to the temperature and pressure of the high-temperature steam, as the steam temperature further increases to 700-750°C, the service conditions become more stringent and the equipment is required to operate without failure for a long time, which requires the alloy to maintain excellent process performance and at the same time Further improve the strength, thermal stability and oxidation corrosion resistance of the alloy. However, the traditional ferritic steel and austenitic steel can no longer meet the requirements, and new alloys must be developed

Method used

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  • Nickel-based high-temperature alloy used for ultra-supercritical boiler and preparation method and application of nickel-based high-temperature alloy
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  • Nickel-based high-temperature alloy used for ultra-supercritical boiler and preparation method and application of nickel-based high-temperature alloy

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Experimental program
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Effect test

Embodiment 1

[0040] Alloy composition (G28) of this example: C0.026, Cr22.8, Co15, Mo1.98, Nb1.49, Al1.2, Ti1.81, B0.006, Si0.22, Mn<0.05, P<0.02 , S≤0.003, more than Ni.

[0041] The metallographic structure of the alloy is as figure 1 As shown, its grain size is 3 to 5 grades, MC carbide and M 23 C 6 The carbides are distributed on the matrix or grain boundaries, and the nano-scale γ' strengthening phase is evenly distributed on the matrix.

[0042] The metallographic structure of the alloy after long-term aging for 10000h at 700°C, 750°C and 800°C is shown in figure 2 , as can be seen from the figure, the alloy still maintains good structural stability.

[0043] The alloy properties of this embodiment are as follows:

[0044] Tensile properties at room temperature: σ b =1170MPa, σ 0.2 =735MPa, δ=27.0%, ψ=38.0%.

[0045] Tensile properties at 600°C: σ b =955MPa, σ 0.2 =580MPa, δ=30.0%, ψ=31.5%.

[0046] Tensile properties at 650°C: σ b =965MPa, σ 0.2 =590MPa, δ=29.5%, ψ=30....

Embodiment 2

[0061] Alloy composition (G34): C0.02, Cr21, C o 16, M o 1.0, Nb3.0, Al1.8, Ti1.5, B0.008, P<0.02, Mn<0.05, Si<0.1, S≤0.003, more than Ni.

[0062] Tensile properties at room temperature: σ b =1266MPa, σ 0.2 =893MPa, δ=32.0%, ψ=31.0%

[0063] Tensile properties at 750°C: σ b =965MPa, σ 0.2 =760MPa, δ=23.5%, ψ=22.5%.

Embodiment 3

[0065] Alloy composition (G20): C0.045, Cr21.7, Co9.8, Fe10, Mo2.23, Nb1.24, Al1.32, Ti1.51, B0.005, P0.02, Mn<0.05, Si< 0.1, S≤0.003, more than Ni.

[0066] Tensile properties at room temperature: σ b =1101MPa, σ 0.2 =631 MPa, δ=37.5%, ψ=47.0%.

[0067] Tensile properties at 750°C: σ b =765MPa, σ 0.2 =535MPa, δ=36.0%, ψ=36.0%.

[0068] Tensile properties at 800°C: σ b =625MPa, σ 0.2 =470MPa, δ=38.5%, ψ=43.0%.

[0069] Durability performance: 69.2h at 700°C / 370MPa; 398.35h at 750°C / 300MPa.

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Abstract

The invention discloses nickel-based high-temperature alloy used for an ultra-supercritical boiler and a preparation method and application of the nickel-based high-temperature alloy and belongs to the technical field of high-temperature alloy materials. The alloy comprises, by weight, 0.02-0.08% of C, 21-25% of Cr, 10-16% of Co, 1.0-3.0% of Mo, 1.0-3.0% of Nb, 1.0-1.8% of Al, 1.5-2.5% of Ti, 0.002-0.008% of B, 0.002-0.03% of Si, 0-10% of Fe and the balance Ni and inevitable impurities. The alloy is high in creep strength, excellent in structure stability and good in oxidation resistance and corrosion resistance within the applicable temperature range; meanwhile, the cold and hot machining performance is excellent, and the alloy can serve for a long time at the temperature of 600-800 DEG C.

Description

technical field [0001] The invention relates to the technical field of high-temperature alloy materials, in particular to a nickel-based high-temperature alloy for ultra-supercritical boilers and a preparation method and application thereof. The high-temperature alloy is used for components in service at 600-800°C. Background technique [0002] Metal materials working in high-temperature and harsh environments should have high high-temperature strength, good oxidation and corrosion resistance, and excellent process performance, for example, water-cooled walls, superheaters, reheaters, headers, etc. in ultra-supercritical coal-fired power boilers Components, on the one hand, must withstand high-temperature corrosion on the flue gas side and high-temperature oxidation on the steam side, and on the other hand, must have high-temperature durability (≥100MPa) and thermal stability for more than 100,000 hours. In addition, the material is also required to have good fatigue perform...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C30/00C22C30/02C22C1/03
Inventor 周兰章王常帅郭永安
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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