Nickel base alloy and preparation method thereof

A nickel-based alloy and alloy technology, which is applied in the field of nickel-based alloys and their manufacturing, can solve the problems of inability to meet the use requirements of new brush type seals, easy scaling, etc., and achieve high high temperature oxidation resistance, high temperature oxidation resistance. The effect of high wear resistance

Active Publication Date: 2013-06-19
BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The honeycomb belt on the seal is not only resistant to high temperature, but also soft in texture. When it rubs against the surface of the rotor, it will not damage the rotor. The disadvantage is that it is easy to scale
Therefore, the current use temperature of commonly used brush wire alloys is generally below 700°C, which cannot meet the use requirements of the new brush seal at 750°C.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The specific chemical composition (wt%) of the alloy is: C: 0.03%, Si: 0.03%, Mn: 0.74%, Cr: 20.33%, Al: 3.86%, Co: 8.06%, Mo: 3.09%, RE: 0.07%, Fe: 0.20%, Mg: 0.015%, P: <0.01%, S: 0.0030%, and Ni.

[0023] It is smelted in a vacuum induction furnace, cast into a φ90mm round steel ingot as an electrode rod, and then smelted into a 80Kg round steel ingot by electroslag remelting. Steel ingot forged into 90 2 mm billet, it is hot-rolled into φ8mm wire rod, and then cold-drawn. During cold drawing, the amount of deformation per pass is controlled at about 40%, and the annealing temperature for intermediate recovery and recrystallization is 1100°C. Finally, cold drawing to φ0.08mm, and then thermal tension annealing, the annealing temperature is 750°C; the speed is 50m / min; the tension is 3N. That is, the desired product is obtained. The curvature of the alloy wire is 3.8mm / m.

[0024] The tensile strength of the alloy at 538°C and 816°C is 900MPa and 730MPa respectiv...

Embodiment 2

[0027] The specific chemical composition (wt%) of the alloy is: C: 0.05%, Si: 0.07%, Mn: 0.72%, Cr: 20.28%, Al: 4.24%, Co: 8.01 %, Mo: 3.04%, RE: 0.13%, Fe: 0.61%, Mg: 0.01%, P: <0.01%, S: 0.0019%, Ni.

[0028] It is smelted in a vacuum induction furnace, cast into a φ90mm round steel ingot as an electrode rod, and then smelted into a 70Kg round steel ingot by a vacuum waste method. Steel ingot forged into 90 2 mm billet, it is hot-rolled into φ8mm wire rod, and then cold-drawn. During cold drawing, the amount of deformation per pass is controlled at about 45%, and the annealing temperature for intermediate recovery and recrystallization is 1050°C. Finally, cold drawing to φ0.08mm, and then thermal tension annealing, the annealing temperature is 850 ℃; the speed is 60m / min; the tension is 3N. That is, the desired product is obtained. The curvature of the alloy wire is 3.6mm / m.

[0029]The tensile strength of the alloy is 880MPa and 725MPa at 538℃ and 816℃, respectively. ...

Embodiment 3

[0032] The specific chemical composition (wt%) of the alloy is: C: 0.04%, Si: 0.05%, Mn: 0.71%, Cr: 22%, Al: 4.2%, Co: 9%, Mo: 3.4%, RE: 0.08%, Fe: 2.20%, Mg: 0.02%, P: <0.01%, S: 0.0030%, Ni.

[0033] It is smelted in a vacuum induction furnace, cast into a φ90mm round steel ingot as an electrode rod, and then smelted into a 80Kg round steel ingot by electroslag remelting. Steel ingot forged into 90 2 mm billet, it is hot-rolled into φ8mm wire rod, and then cold-drawn. During cold drawing, the amount of deformation per pass is controlled at about 50%, and the annealing temperature for intermediate recovery and recrystallization is 1100°C. Finally, cold drawing to φ0.08mm, and then thermal tension annealing, the annealing temperature is 900 ℃; the speed is 65m / min; the tension is 3N. That is, the desired product is obtained. The curvature of the alloy wire is 3.3mm / m.

[0034] The tensile strength of the alloy at 538°C and 816°C is 890MPa and 715MPa respectively, and the ...

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Abstract

The invention provides a nickel base alloy which is relatively high in high-temperature strength, wearing resistance and oxidation resistance and a production method of the nickel base alloy. The chemical components of the nickel base alloy include, by weight, C smaller than or equal to 0.15%, 5.0-10.0% of Co, 19.0-25% of Cr, 2.0-5.0% of Mo, 2.0-7.0% of Al, 0.01-0.2% of rare earth, Fe smaller than or equal to 5.0%, 0.01-0.1% of Mg, and the balance of Ni. Elements such as Co, Cr, Mo, Al and Mg and a trace amount of rare earth are added to the nickel base alloy, through the preparation technique matched with the nickel base alloy, the overall performance including cold and hot machining performance, high-temperature strength, the friction coefficient, the high-temperature oxidation resistance and the like of the alloy is improved, and by adoption of a hot tension annealing process, the straightness requirement of extremely-thin wires is ensured. The nickel base alloy has high strength, high wearing resistance, high-temperature oxidation resistance and high straightness at 750 DEG C and meets requirements for manufacturing novel brush type sealing brush wire material.

Description

technical field [0001] The invention relates to a nickel-based alloy with high strength, wear resistance and oxidation resistance at high temperature and a manufacturing method thereof. Background technique [0002] The materials involved in the present invention are used in the manufacture of new advanced brush seals for high temperature (750°C), high speed (100 m / s), high pressure, low hysteresis. [0003] The main sealing devices currently used include labyrinth seals, honeycomb seals and brush seals. The principle of the labyrinth seal is to produce damping effect through multiple throttling expansions to reduce the leakage of steam along the axial direction. However, since the teeth are annular chambers, the annular flow greatly reduces the effect of eddy current deceleration. The length of the labyrinth seal is limited, and the gap between the seal and the seal is set to avoid dynamic and static friction damage, so the leakage of the labyrinth seal is relatively large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C30/00C22F1/10C22F1/00
Inventor 章清泉胡博炜李振瑞吴会云李明扬曹宇牛永吉
Owner BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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