High-temperature-stability gamma'-phase-reinforced cobalt-base high-temperature alloy and preparation method thereof

A high-temperature stable, high-temperature alloy technology, applied in the field of new materials, can solve the problems of limited temperature-bearing capacity and inability to further improve high-temperature strength, and achieve the effect of high-temperature strength and temperature-bearing capacity

Active Publication Date: 2013-04-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the main problem of existing Co-Al-W-based alloys is that the γ' phase dissolution temperature is mostly in the range of 1000 ~ 1100°C, resulting in a γ / γ' two-phase structure with a typical strengthening effect (the volume fraction of the γ' phase is greater than 60%, and evenly distributed in the γ phase) the formation temperature range is only 900 ~ 1000°C, it is not easy to form a similar γ / γ' two-phase structure in a higher temperature range above 1000°C, so that it cannot further increase its high temperature Strength, indicating that the temperature bearing capacity of such cobalt-based alloys is still limited

Method used

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  • High-temperature-stability gamma'-phase-reinforced cobalt-base high-temperature alloy and preparation method thereof
  • High-temperature-stability gamma'-phase-reinforced cobalt-base high-temperature alloy and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] Weigh high-purity elemental materials such as Co, Al, W, Ta, and Ti according to the composition ratio shown in Alloy 1 in Table 1; put the high-purity elemental materials weighed above into a vacuum induction furnace, and evacuate to 5× 10 -2 Below Pa, then heat up to 1500°C, cast after smelting for 20 minutes, and melt into a cobalt-based superalloy ingot; heat preservation at melting temperature for 24 hours, air cooling; then heat preservation at 1000°C aging temperature for 50 hours, quenching and cooling, to obtain a high-temperature stable γ' phase-strengthened cobalt-based superalloy.

Embodiment 2

[0032] Weigh high-purity elemental materials such as Co, Al, W, Ta, and Ti according to the composition ratio shown in alloy 2 in Table 1; put the high-purity elemental materials weighed above into a vacuum induction furnace, and evacuate to 5× 10 -2 Below Pa, then heat up to 1540°C, cast after smelting for 20 minutes, and melt into a cobalt-based superalloy ingot; heat preservation at melting temperature for 24 hours, air cooling; then heat preservation at 1000°C aging temperature for 50 hours, quenching and cooling, to obtain a high-temperature stable γ' phase-strengthened cobalt-based superalloy.

[0033] The DSC test was carried out on the alloys of the examples to determine the dissolution temperature of the γ' phase. The γ' phase dissolution temperature of alloy 2 is 1184°C, which is significantly higher than that of Ishida et al. Cobalt-base alloy with high heat resistance and high strength and process for producing the same; Chinese Patent, Publication No. 101248198...

Embodiment 3

[0035] Weigh high-purity elemental materials such as Co, Al, W, Ta, and Ti according to the composition ratio shown in alloys 3 to 6 in Table 1; put the high-purity elemental materials weighed above into a vacuum induction furnace, and evacuate to 5×10 -2 Below Pa, then heat up to 1530°C, cast after smelting for 30 minutes, and melt into a cobalt-based superalloy ingot; heat preservation at the melting temperature for 24 hours, air cooling; then heat preservation at the aging temperature of 1050°C for 30 hours, quenching and cooling, and obtain a high-temperature stable γ' phase-strengthened cobalt-based superalloy.

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Abstract

The invention belongs to the technical field of new materials, and relates to a gamma'-phase high-temperature-stability cobalt-base high-temperature alloy with gamma / gamma' two-phase structure, which is a candidate material for high-temperature hot end components of gas turbines for aviation, spaceflight, vessels, power generation and the like. The alloy comprises the following components in atomic percentage: 4-12% of Al, 4-12% of W, 1-4% of Ta, 1-6% of Ti, 0-10% of Cr, 0-3% of Mo, 0-2% of Hf, 0-1% of C, 0-1% of B and the balance of Co. The preparation method comprises the following steps: smelting in a vacuum induction furnace, carrying out solid solution heat treatment at 1250-1300 DEG C, and carrying out aging heat treatment at 1000-1100 DEG C. After carrying out L12-type gamma'-phase high-temperature reinforcement, the gamma' shape is cubic, the volume percent is higher than 60%, and the gamma'-phase is uniformly distributed in the gamma-phase. Compared with the traditional cobalt-base high-temperature alloy, the alloy provided by the invention has higher application temperature; and compared with the recently developed similar cobalt-base alloys, the alloy provided by the invention has higher gamma'-phase solution temperature and gamma / gamma' two-phase structure stable existence temperature.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a cobalt-based superalloy having a gamma / gamma' two-phase structure and a gamma' phase stable at high temperature. Background technique [0002] Superalloys are widely used in aerospace, marine ships, energy power, nuclear industry, petrochemical and other fields, especially for hot end components of advanced power propulsion systems such as turbine engines. Such parts mostly use nickel-based superalloys, because they not only have excellent oxidation and corrosion resistance, but also have L1 2 Excellent high-temperature mechanical properties provided by the γ' phase strengthening of the crystal structure. [0003] Cobalt-based superalloys are an earlier class of superalloys, which have a higher melting point than nickel-based alloys, superior hot corrosion resistance, thermal fatigue resistance and welding performance. However, because it mainly relies on solid solution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C1/02
Inventor 冯强薛飞王美玲丁贤飞周海晶
Owner UNIV OF SCI & TECH BEIJING
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