High-strength gamma'-phase-strengthened cobalt-based high-temperature alloy

A high-temperature alloy, high-strength technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve the problem of reducing the oxidation resistance of alloys, and achieve excellent high-temperature oxidation resistance and thermal corrosion performance, high-temperature strength, and high-temperature The effect of excellent corrosion resistance

Inactive Publication Date: 2018-08-17
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of Ta and Mo can promote the precipitation of μ phase, and Ti can promote the formation of Co 2 AlTi, while V, Nb, etc. can significantly reduce the oxidation resistance of the alloy

Method used

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  • High-strength gamma'-phase-strengthened cobalt-based high-temperature alloy
  • High-strength gamma'-phase-strengthened cobalt-based high-temperature alloy
  • High-strength gamma'-phase-strengthened cobalt-based high-temperature alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In Table 1, the yield strength of alloy 1 is higher, which is determined by figure 2 It can be seen that the yield strength of alloy 1 is about 2.5 times that of the traditional cobalt-based directionally solidified superalloy DZ40M. Not only that, Alloy 1 has good high temperature oxidation resistance and hot corrosion resistance. Table 2 shows the average oxidation rate of alloys 1-3 and DZ40M at 900°C and according to the standard name "Test Method for Determination of Oxidation Resistance of Steel and Superalloys" (standard number HB5258-2000, implementation date January 1, 2001) Evaluation of the oxidation resistance of alloys; Table 3 shows the average hot corrosion weight gain of alloys 1-3 at 800 and 900 °C. It can be seen from Table 2 and Table 3 that compared with DZ40M, the average oxidation weight gain and average hot corrosion weight gain of Example alloy 1 are significantly smaller than those of the comparative alloy, showing excellent oxidation resistan...

Embodiment 2

[0041] In Table 1, the yield strength of alloy 2 is higher, which is determined by figure 2 It can be seen that the high temperature yield strength of alloy 2 is about 2.5-3 times that of the traditional cobalt-based directionally solidified superalloy DZ40M. Not only that, but it can be seen from Table 2 and Table 3 that compared with DZ40M, the average oxidation weight gain and average hot corrosion weight gain of Example alloy 2 are significantly smaller than those of the comparative alloy, showing excellent oxidation resistance and hot corrosion resistance.

Embodiment 3

[0043] In Table 1, the yield strength of alloy 3 is higher, which is determined by figure 2 It can be seen that the high temperature yield strength of alloy 3 is about 2.5-3 times that of the traditional cobalt-based directionally solidified superalloy DZ40M. Moreover, it can be seen from Table 2 and Table 3 that compared with DZ40M, the average oxidation weight gain and average hot corrosion weight gain of Example alloy 3 are significantly smaller than those of the comparative example alloy, showing excellent oxidation resistance and hot corrosion resistance. In addition, Example Alloy 3 has good durability properties. Under the condition of temperature of 900°C and test stress of 160MPa, the durability life of Example alloy 3 is as high as 184.117h, while that of DZ40M is 85h. The alloys of the present invention exhibit excellent high temperature durability properties. (DZ40M data comes from "China Superalloy Handbook")

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PUM

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Abstract

The invention discloses a high-strength gamma'-phase-strengthened cobalt-based high-temperature alloy which is mainly prepared from the elements: Co, Ni, Al, W, Cr, Ta, Ti and the like. The high-strength gamma'-phase-strengthened cobalt-based high-temperature alloy is prepared from the elements in percentage by mass: 20.0 to 24.5 percent of Ni, 14.5 to 19.5 percent of W, 3.4 to 6.0 percent of Al,3.0 to 6.8 percent of Cr, 4.0 to 5.8 percent of Ta, 1.5 to 2.0 percent of Ti, 0.3 to 1.0 percent of Mo, 0 to 0.14 percent of Zr, 0.01 to 0.015 percent of B, 0 to 0.1 percent of C, 0 To 0.007 percent of Y, and the balance Co. A main composition phase of the alloy is (a) cobalt-based solid solution gamma+intermetallic compound gamma', or (b) cobalt-based solid solution gamma+intermetallic compound gamma'+MC type carbide+crystal boundary disperse precipitation intermetallic compound mu. The alloy can be applied to turbo machine hot end components in the industrial fields such as metallurgy, petroleum, energy and electric power, and the working temperature of the alloy can reach to 900 DEG C. The alloy is higher in high-temperature strength; the yield strength of the alloy under the high temperature condition (700 to 900 DEG C) is about 2 to 3 times of DZ40M; and the endurance property, the high temperature oxidation resistance and the hot corrosion performance of the alloy are excellent and superior to a traditional cobalt-based high-temperature alloy.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a new high-strength γ' phase-strengthened cobalt-based superalloy. Background technique [0002] Improving the power and efficiency of gas turbines and increasing the gas inlet temperature (Turbine Inlet Temperature, TIT) are important prerequisites for promoting the development of modern industry. The improvement of gas turbine TIT must be guaranteed by superalloys with excellent comprehensive properties. At present, nickel-based superalloys (such as IN738LC, Rene5SC, MGA1400, GTD-111DS, etc.) are widely used at home and abroad as materials for the hot end parts of gas turbines. Compared with nickel-based superalloys, cobalt-based superalloys have the advantages of good creep resistance and hot corrosion resistance, low thermal expansion coefficient and high thermal conductivity, etc., but the traditional cobalt-based superalloys lack the γ′ phase precipitation strengthenin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C30/00F01D9/02
CPCC22C19/07C22C30/00F01D9/02F05D2300/175
Inventor 王磊高博刘杨宋秀
Owner NORTHEASTERN UNIV
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