A low-cost, high-strength, hot-corrosion-resistant nickel-based superalloy and its preparation process and application

A nickel-based superalloy and a preparation process technology, applied in the field of nickel-based superalloys, can solve the problem that the temperature bearing capacity is difficult to meet the design requirements of G/H-class heavy-duty gas turbines, so as to ensure the stability of the structure, ensure the thermal corrosion resistance, and improve the The effect of high temperature strength

Active Publication Date: 2020-04-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

K452 alloy is a relatively mature thermal corrosion resistant superalloy in my country, but its temperature bearing capacity is difficult to meet the design requirements of G / H heavy-duty gas turbines

Method used

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  • A low-cost, high-strength, hot-corrosion-resistant nickel-based superalloy and its preparation process and application
  • A low-cost, high-strength, hot-corrosion-resistant nickel-based superalloy and its preparation process and application
  • A low-cost, high-strength, hot-corrosion-resistant nickel-based superalloy and its preparation process and application

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Experimental program
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Effect test

Embodiment

[0046] The 850 ℃ long-term structural stability of embodiment alloy (No.6 and No.2), as figure 2 shown. No.6 Alloy (N v =2.53) After aging for 1000h, a small amount of σ phase was precipitated (see figure 2 (a)); No.2 alloy (N v =2.45) After aging for 1000h, no TCP phase was precipitated (see figure 2 (b)). It can be seen that in order to ensure the structural stability of the alloy, it is necessary to limit the N of the alloy of the present invention. v The value is less than 2.45.

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Abstract

The invention discloses a nickel-base superalloy with low cost, high strength and hot corrosion resistance as well as preparation technology and application thereof, and belongs to the technical fieldof nickel-base superalloy. The nickel-base superalloy is prepared from the following chemical components in percentage by weight: 18.0-19.9% of Cr, 10.0-12.0% of Co, 2.2-3.5% of Al, 3.1-4.2% of Ti, 5.1-6.5% of W, 0.3-0.9% of Mo, 0.4-1.2% of nb, 0.005-0.15% of C, 0.001-0.03% of B, 0.005-0.08% of Zr and the balance of Ni. The alloy has the advantages of excellent hot corrosion resistance and high-temperature strength as well as good structure stability and is suitable for preparing a hot-end component of a gas turbine and can be used for long in a gas corrosion environment.

Description

technical field [0001] The invention relates to the technical field of nickel-based superalloys, in particular to a low-cost, high-strength, thermal-corrosion-resistant nickel-based superalloy and its preparation process and application. The alloy is suitable for preparing long-life thermal-corrosion-resistant gas turbine hot end components. Background technique [0002] The working environment and characteristics of gas turbines are completely different from those of aeroengines, which puts forward different requirements for the materials of the hot end parts of gas turbines. First of all, the fuel used by gas turbines contains many elements such as V and S, which can easily cause thermal corrosion damage to materials. Secondly, the running time of gas turbine blades is long, the overhaul cycle is as long as 20,000-40,000 EOH (equivalent operating hours), and the total life is as long as 60,000-80,000 EOH. Therefore, it is required that the material of the hot end part of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10
CPCC22C1/023C22C19/055C22F1/10
Inventor 李相伟董加胜刘心刚王尧楼琅洪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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