Cobalt-based high-temperature alloy and preparation method thereof

A high-temperature alloy, cobalt-based technology, applied in the field of high-temperature alloys, can solve the problems of unfavorable high-temperature oxidation resistance of alloys, not optimal overall performance of alloys, low-density structure stability, etc., to achieve good application prospects, good oxidation resistance, The effect of high tissue stability

Active Publication Date: 2019-02-12
UNIV OF SCI & TECH BEIJING
View PDF6 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition characteristics of the cobalt-based deformed alloy of Fu Huadong's research group in China emphasize the role of the alloy element Mo, and replace part of the W element with Mo to reduce the alloy density. However, it is well known that Mo is not good for the high-temperature oxidation resistance of the alloy [Fu Hua Dong, Xie Jianxin, Zhang Yi, A c

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cobalt-based high-temperature alloy and preparation method thereof
  • Cobalt-based high-temperature alloy and preparation method thereof
  • Cobalt-based high-temperature alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh the elemental materials such as Co, Al, W, Ti, Ta, Ni, Cr according to the composition ratio shown in alloy 1-2 in Table 1; place the above-mentioned elemental raw materials weighed in the crucible of the vacuum arc melting furnace, the first Vacuum down to 3×10 times -3 Pa, filled with high-purity Ar protective gas to 7 × 10 4 Pa, then evacuated to 3×10 for the second time -3 Pa, then filled with high-purity Ar protective gas to 7×10 4 Pa; the alloy is smelted in a high-purity Ar protective atmosphere, and the current of the smelting arc is controlled at 250A. After the alloy is completely melted, it is kept for 60 seconds, and then the power is turned off and cooled until the alloy is completely solidified. Repeat the smelting step 8 times to finally obtain cobalt base superalloy ingot; in a high-purity Ar protective atmosphere, the above-prepared cobalt-based superalloy ingot was kept at a solution temperature of 1250°C for 24 hours, and air-cooled; then kept...

Embodiment 2

[0044] Weigh the elemental materials such as Co, Al, W, Ti, Ta, Ni, Cr according to the composition ratio shown in alloy 1-2 in Table 1; place the above-mentioned elemental raw materials weighed in the crucible of the vacuum arc melting furnace, the first Vacuum down to 3×10 times -3 Pa, filled with high-purity Ar protective gas to 7 × 10 4 Pa, then evacuated to 3×10 for the second time -3 Pa, then filled with high-purity Ar protective gas to 7×10 4 Pa; the alloy is smelted in a high-purity Ar protective atmosphere, and the current of the smelting arc is controlled at 250A. After the alloy is completely melted, it is kept for 60 seconds, and then the power is turned off and cooled until the alloy is completely solidified. Repeat the smelting step 8 times to finally obtain cobalt base superalloy ingot; in a high-purity Ar protective atmosphere, the above-prepared cobalt-based superalloy ingot was kept at a solution temperature of 1250°C for 24 hours, and air-cooled; then kept...

Embodiment 3

[0047] Weigh the elemental materials such as Co, Al, W, Ti, Ta, Ni, Cr according to the composition ratio shown in alloy 1-2 in Table 1; place the above-mentioned elemental raw materials weighed in the crucible of the vacuum arc melting furnace, the first Vacuum down to 3×10 times -3 Pa, filled with high-purity Ar protective gas to 7 × 10 4 Pa, then evacuated to 3×10 for the second time -3 Pa, then filled with high-purity Ar protective gas to 7×10 4 Pa; the alloy is smelted in a high-purity Ar protective atmosphere, and the current of the smelting arc is controlled at 250A. After the alloy is completely melted, it is kept for 60 seconds, and then the power is turned off and cooled until the alloy is completely solidified. Repeat the smelting step 8 times to finally obtain cobalt base superalloy ingot; in a high-purity Ar protective atmosphere, the above-prepared cobalt-based superalloy ingot was kept at a solution temperature of 1250°C for 24 hours, and air-cooled; then kept...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Average sizeaaaaaaaaaa
Average sizeaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the field of high-temperature alloys, and particularly relates to a gamma' phase reinforced cobalt-based high-temperature alloy with high-stability structure and good oxidation resistance. The gamma' phase reinforced cobalt-based high-temperature alloy comprise the following chemical components of, by weight, 2.5-4% of Al, 3-10% of W, 0.5-5% of Ti, 1.5-6% of Ta, 18-35% ofNi, 10-14% of Cr, 0-4.5% of Nb, 0-0.5% of Hf, 0-0.1% of C, 0-0.1% of B, 0-0.1% of Zr, 0-0.5% of Si, and the balance Co, and the contents of Al plus Cr is more than or equal to 13.5%, the Al plus the Ti plus the Ta plus the Nb are more than or equal to 9.5%, and the W plus the Ta is less than or equal to 12.5%; and a vacuum arc furnace is adopted for smelting, then solid solution is carried out atthe temperature of 1200-1250 DEG C, and aging heat treatment is carried out at the temperature of 700-900 DEG C. The gamma/gamma' two-phase structure stably exists at the temperature of 700-900 DEG C,and the gamma' strengthening phase volume fraction is larger than 40%; and meanwhile, the alloy has good oxidation resistance, large hot working window and low alloy density, and is an alternative material of a high-temperature disc piece of an aero-engine and an industrial gas turbine.

Description

technical field [0001] The invention belongs to the technical field of superalloys, and relates to a gamma' phase-strengthened cobalt-based superalloy with high structural stability and good oxidation resistance and a preparation method thereof. Background technique [0002] Superalloys have high high temperature strength, excellent creep and fatigue resistance, good oxidation and corrosion resistance, structural stability and service reliability, so they have become irreplaceable key materials for hot end parts of aero engines and industrial gas turbines. From the 1930s to the 1950s, cobalt-based superalloys with solid solution strengthening and carbide strengthening were developed, and were first applied in the hot end parts of aero-engines. Compared with nickel-based superalloys, cobalt-based superalloys have higher melting points, better thermal corrosion resistance, thermal fatigue resistance and welding performance. However, due to the lack of L1 in traditional cobalt...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22C19/07C22C1/02C22F1/10
CPCC22C1/02C22C19/07C22F1/002C22F1/10
Inventor 李龙飞冯强庄晓黎
Owner UNIV OF SCI & TECH BEIJING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap