A Ni-based Superalloy with Stable Structure and Anti-Hot Corrosion

A nickel-based superalloy, hot corrosion technology, applied in the field of metal materials, can solve the problems of harmful phases, high Cr content, poor alloy structure stability, etc., to improve performance and structure stability, improve structure uniformity, and good structure stability. sexual effect

Active Publication Date: 2018-04-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high Cr content in the hot corrosion resistant alloy, generally higher than 12%, the stability of the alloy structure is poor, and harmful phases are easily precipitated at 800-950°C.

Method used

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  • A Ni-based Superalloy with Stable Structure and Anti-Hot Corrosion
  • A Ni-based Superalloy with Stable Structure and Anti-Hot Corrosion
  • A Ni-based Superalloy with Stable Structure and Anti-Hot Corrosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In Table 2, alloy No.1 contains no Zr and contains 0.3wt% Fe. The composition is shown in Table 2. The Nv value of the alloy is 2.36at%, which is lower than the TCP phase formation Nv critical value of 2.49at%, and the TCP formation tendency is low. Preparation process: refining at 1600°C±10°C for 5 minutes, casting at 1410°C±20°C, shell temperature at 850°C±50°C; properties of the alloy at various temperatures are shown in Table 3.

[0023] Table 3 No.1 alloy tensile properties

[0024] T，℃

Embodiment 2

[0026] The No.2 alloy composition in Table 2 contains 0.05wt% Zr, see Table 2. The Nv value of the alloy decreased slightly to 2.34at%. Preparation process: refining at 1550°C±10°C for 8 minutes, pouring at 1410±20°C, shell temperature at 850±50°C; see Tables 4 and 5 for tensile and durability properties of No.2 alloy.

[0027] Table 4 No.2 alloy tensile properties

[0028] T，℃

σ b , MPa

σ s , MPa

δ, MPa

ψ, MPa

20

1145

1070

6

9

650

1140

855

8

10

816

960

805

13

11

[0029] Table 5 No.2 Alloy Durability Properties

[0030] T,℃

Embodiment 3

[0032] The No.3 alloy composition in Table 2 contains 0.06wt% Zr, and the Nv value of the alloy is slightly increased to 2.44at%. The preparation process that adopts is with embodiment 1. The alloy has low plasticity at room temperature, as shown in Table 6, and the high-temperature yield strength is the same as that of the alloy in Example 1, as shown in Table 6.

[0033] Table 6 No.3 Alloy Properties

[0034] T，℃

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Abstract

The purpose of the present invention is to provide a thermal corrosion resistant nickel-based superalloy with stable structure, characterized in that: the composition of the alloy is as follows (wt%): C0.06~0.2; B≤0.035; Cr13.0~15.0; Co9 .0~10.0; Mo1.2~1.8; W3.5~4.1; Al2.8~3.4; Ta3.1~4.0; Ti4.6~5.2; Fe≤1.0; Zr≤0.06; P≤0.005; Si≤0.2; Pb≤0.0005; Bi≤0.0001; As≤0.005; Sn≤0.002; Sb≤0.001. The alloy has high structural stability and good thermal corrosion resistance, is suitable for making high-temperature components of gas turbines, and can be used for a long time in a gas corrosion environment.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular provides a heat-corrosion-resistant nickel-based superalloy with stable structure. Background technique [0002] The gas turbine has a service life of more than 80,000 hours, so the engine blade material is required to have excellent high-temperature structural stability and excellent performance. GTD111 is a hot corrosion resistant polycrystalline alloy containing Zr or Hf (see Table 1) invented by GE Company of the United States. It is used for turbine blades of gas turbine engines and has been used for a long time. Due to the high Cr content in the hot corrosion resistant alloy, generally higher than 12%, the stability of the alloy structure is poor, and harmful phases are easily precipitated at 800-950 °C. Superalloys2004, Edited by K.A.Green, T.M.Pollock, H.Harada, T.E.Howson, R.C.Reed, J.J.Schirra, and S, Walston, TMS (TheMinerals, Metals&Materials Society), 2004, pp163-171...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/02
Inventor 李辉楼琅洪张健郑宝任建军王雁
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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