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High-strength rare earth doped alloy material with high-temperature oxidation resistance and preparation method

A technology of high temperature oxidation resistance and alloy materials, applied in the field of metal materials, can solve the problem of high cost

Active Publication Date: 2017-05-10
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past, China mainly used similar cobalt-based alloy materials imported from abroad. Since the formula and manufacturing technology of foreign cobalt-based alloy materials are kept secret, the cost is high

Method used

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  • High-strength rare earth doped alloy material with high-temperature oxidation resistance and preparation method
  • High-strength rare earth doped alloy material with high-temperature oxidation resistance and preparation method
  • High-strength rare earth doped alloy material with high-temperature oxidation resistance and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0064] According to the chemical composition (Wt%) C: 0.08, Ni: 24.5, Cr: 19.5, Zr: 0.02, B: 0.003, W: 11.5, La: 0.12, Co: balance, refined twice in a vacuum furnace, the temperature is 1525 ~ 1565°C, wherein, the first refining time is 10-20 minutes, the vacuum degree is 1-0.1Pa, the second refining time is 10 minutes, the vacuum degree is 0.1-0.002Pa, uniform pouring, and its uniform pouring is in a thin stream Fast pouring, the time is 12 to 18 seconds, to obtain remelted electrode rods;

[0065] The remelted electrode rod is remelted under the condition of filling helium in vacuum, the vacuum degree is ≤6.5Pa, the current is 2500-3000A, and the alloy ingot is obtained, and the homogenization heat treatment is carried out. For alloy ingots with a diameter larger than 200mm, according to the diameter of the alloy ingot, the total holding time is determined as 1.5min for 1mm holding time; for alloy ingots with a diameter of less than 200mm, the holding time is 5h, and the all...

Embodiment 2

[0069] According to chemical composition (Wt%) C: 0.10, Ni: 25.5, Cr: 20.5, Zr: 0.04, B: 0.004, W: 12.5, La: 0.15, Co: balance, all the other preparation methods are the same as in Example 1.

[0070] After subsequent processing, the belt for sealing sheet is applied to aero-engine turbines and sub-gas turbines. 900℃, high temperature oxidation rate 0.026g / (m 2 .h).

[0071] After testing: room temperature tensile strength R m is 955MPa, R p0.2 It is 485MPa. High temperature durable life and high temperature elongation 870°C, Rm: 115MPa, τ is 70h, A5 is 8%; 925°C, Rm: 70MPa, τ is 39h, A5 is 14%

Embodiment 3

[0073] According to chemical composition (Wt%) C: 0.11, Ni: 25.5, Cr: 21.0, Zr: 0.06, B: 0.005, W: 12.5, La: 0.18, Co: balance, all the other preparation methods are the same as in Example 1.

[0074] After subsequent processing into strips for corrugated pipes, it is used in aerospace and aerospace. 900℃, high temperature oxidation rate 0.023g / (m 2 .h).

[0075] After testing: room temperature tensile strength R m 969MPa, R p0.2 It is 486MPa. High temperature durability and elongation at 870°C, Rm: 115MPa, τ is 75h, A5 is 12%; 925°C, Rm: 70MPa, τ is 43h, A5 is 18%.

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Abstract

The invention relates to a high-strength rare earth doped alloy material with high-temperature oxidation resistance and a preparation method. The material comprises components in percentage by weight as follows: 0.07%-0.15% of C, 24.0%-27.0% of Ni, 18.50%-22.50% of Cr, 0.02%-0.1% of Zr, 0.002%-0.008% of B, 11%-13% of W, 0.12%-0.20% of La, lower than or equal to 1.0% of Si, lower than or equal to 2.0% of Fe, lower than or equal to 0.20% of Cu, lower than or equal to 0.020% of impurities and harmful elements and the balance of Co. The material has good strength, high-temperature oxidation resistance and high-temperature endurance, fills up the blank of the kind of materials in China and can be applied to the fields of national petrochemical, aerospace, aviation and the like.

Description

technical field [0001] The invention relates to a metal material, in particular to a high-temperature oxidation-resistant high-strength rare earth-doped alloy material and a preparation method thereof. Background technique [0002] Cobalt-based high-temperature alloy strips and wires are key materials for manufacturing engine turbine guide seals, plugs, corrugated seals, and brush seals. These seals, brushes and other components used in the hot end parts of aero-engines are important parts to ensure the safety and reliability of aero-engines. They must have high service temperature, good strength and toughness, excellent oxidation resistance, high corrosion resistance, Features of high reliability. At present, with the increase in batch production of engines in my country and the development of new models, the demand for cobalt-based superalloy strips, foils and components of different varieties and specifications is increasing. Cobalt-based alloy strips, The wire material ...

Claims

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Application Information

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IPC IPC(8): C22C30/02C22C30/00C22C1/02C22F1/16
CPCC22C1/02C22C19/07C22C30/00C22C30/02C22F1/10C22F1/16
Inventor 张十庆雷玖芳温杜斌易出山李方王宏聂尊誉刘洋吴承讪罗炯丁渝红
Owner CHONGQING MATERIALS RES INST
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