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Long-service-life high-strength hot-corrosion-resistant nickel-based superalloy and application thereof

A nickel-based superalloy, long-life technology, applied in the field of metal materials, can solve the problems of late development of heavy-duty gas turbines, lack of superalloy materials, etc., and achieve the effect of improving the stability of long-life tissue

Inactive Publication Date: 2021-03-30
CENT OF EXCELLENCE FOR ADVANCED MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The development of thermal corrosion-resistant nickel-based superalloys in foreign countries is relatively complete, but the development of heavy-duty gas turbines in my country started relatively late, and superalloy materials suitable for F, G / H class heavy-duty gas turbine turbine guide blades are still relatively lacking

Method used

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  • Long-service-life high-strength hot-corrosion-resistant nickel-based superalloy and application thereof
  • Long-service-life high-strength hot-corrosion-resistant nickel-based superalloy and application thereof
  • Long-service-life high-strength hot-corrosion-resistant nickel-based superalloy and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A long-life, high-strength, heat-resistant and corrosion-resistant nickel-based superalloy, comprising the following components by weight percentage:

[0039] Cr 18.5%; Co 18.5%; Al 1.9%; Ti 3.8%; Ta 0%; W 4.9%; Mo 1.0%; Nb 1.2%; C 0.1%; B 0.002%; Zr 0.017%;

[0040] The above-mentioned alloy is used to prepare a test bar, and the ingredients are mixed according to the ingredients in the alloy, and then melted in a vacuum induction furnace. At a temperature of 1550 ° C ~ 1580 ° C, refining for 5 min ~ 10 min, and then at a temperature of 1410 ± 20 ° C Casting under conditions, the temperature range of the shell temperature is 850±50°C, after pouring, a cast nickel-based superalloy test rod is obtained. Among them, the heat treatment parameters of the superalloy test rod are: 1160±10°C / 4h, 850±20°C / 16h. The N of the superalloy test bar v The value is 2.39.

Embodiment 2

[0042] Different from Example 1, the long-life, high-strength, hot-corrosion-resistant nickel-based superalloy of Example 2 includes the following components by weight percentage:

[0043] Cr 18.5%; Co 18.9%; Al 1.9%; Ti 3.8%; Ta 0.1%; W 4.9%; Mo 1.0%; Nb 1.2%; C 0.1%; B 0.015%; Zr 0.017%;

[0044] Its preparation method is the same as that of Example 1 and will not be repeated here.

[0045] The N of the obtained superalloy test bar v The value is 2.38.

[0046] The microstructure of the superalloy test bar is as follows: Figure 1 to Figure 3 As shown, among them, figure 1 is the as-cast structure diagram, figure 2 20μm microstructure of heat treatment state, image 3 The heat-treated microstructure of 2μm. From figure 1 It can be seen that there is no γ / γ′ phase eutectic structure in the as-cast alloy, from figure 2 It can be seen that after heat treatment, there is no η phase precipitation, from image 3 It can be seen that the γ′ phase structure is spherical, wit...

Embodiment 3

[0048] Different from Example 1, the long-life, high-strength, hot-corrosion-resistant nickel-based superalloy of Example 3 includes the following components by weight percentage:

[0049] Cr 19.0%; Co 19.0%; Al 2.0%; Ti 3.9%; Ta 0.1%; W 4.5%; Mo 1.0%; Nb 1.3%; C 0.1%; B 0.015%; Zr 0.017%;

[0050] Its preparation method is the same as that of Example 1 and will not be repeated here.

[0051] The N of the obtained superalloy test bar v The value is 2.46.

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Abstract

The invention discloses a long-service-life high-strength hot-corrosion-resistant nickel-based superalloy. The nickel-based superalloy comprises the following components in percentage by weight of 18.0%-19.9% of Cr, 18.0% to 25.0% of Co, 1.6%-2.8% of Al, 3.1%-4.5% of Ti, 0.1%-0.5% of Ta, 3.1%-4.9% of W, 0%-1.20% of Mo, 0.7%-1.7% of Nb, 0.005% to 0.15% of C, 0.003%-0.03% of B, 0.005% to 0.08% of Zr, and the balance Ni. Through component design optimization of the alloy, the thermal corrosion resistance and the high-temperature strength of the alloy are guaranteed, and meanwhile the long-life structure stability of the alloy is improved. The alloy disclosed by the invention is suitable for manufacturing hot-end parts of gas turbines and can be used for thousands of hours for a long time in agas corrosion environment.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a long-life, high-strength heat-resistant and corrosion-resistant nickel-based superalloy suitable for preparing heat-corrosion-resistant gas turbine hot-end parts and its application. Background technique [0002] Compared with aero-engines, gas turbines not only require superalloys to have good high-temperature strength such as creep and fatigue, but also have unique requirements. The specific unique requirements are as follows: (1) Because the fuel used in gas turbines is extremely easy to cause heat loss of materials Corrosion damage, so it needs to have excellent thermal corrosion resistance; (2) Since the life of the gas turbine is tens of thousands or even hundreds of thousands of hours, it needs to have good long-term tissue stability; (3) Due to the large size of the gas turbine blade, And the structure of the inner cavity is complex, so it needs good casting pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10C22C30/00C22F1/00
CPCC22C19/056C22C1/023C22F1/10C22C30/00C22C1/02C22F1/00
Inventor 李相伟温冬辉王瑶郭秋娟郑江鹏丁仁根初铭强张书彦张鹏
Owner CENT OF EXCELLENCE FOR ADVANCED MATERIALS
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