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High-strength hot-corrosion-resistant Ni-based single crystal superalloy and preparation method

A high-temperature alloy, nickel-based single crystal technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problem of low high-temperature mechanical properties of high-temperature corrosion-resistant high-temperature alloys, and achieve low solid solution temperature and high density Small, low-cost effect

Inactive Publication Date: 2014-08-06
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

[0006] The purpose of the present invention is to provide a high-strength heat-resistant corrosion-resistant nickel-based single crystal superalloy and its preparation method to solve the problem that the high-temperature mechanical properties of existing heat-resistant corrosion-resistant superalloys are generally low

Method used

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  • High-strength hot-corrosion-resistant Ni-based single crystal superalloy and preparation method
  • High-strength hot-corrosion-resistant Ni-based single crystal superalloy and preparation method
  • High-strength hot-corrosion-resistant Ni-based single crystal superalloy and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The specific composition of the alloy in this example is shown in Table 1. After batching and vacuum induction melting according to the alloy composition, it is cast into a master alloy ingot with a size of φ80×500mm, then polished to remove scale, and cut into suitable blocks for use in Preparation of single crystal rods.

[0054] Table 1 The chemical composition (wt%) of the alloy of this embodiment

[0055] chemical composition

C

Cr

co

Mo

W

Content (wt.%)

0.007

13

7

1.9

3.8

chemical composition

Ta

Al

Ti

B

Ni

Content (wt.%)

5.6

4.7

2.4

0.005

margin

[0056] The single crystal rod is prepared in a directional solidification furnace by the spiral crystal selection method. The temperature gradient of the single crystal growth furnace is 60K / cm, the pouring temperature is 1550°C, and the shell temperature is kept consistent with the pouring temperature; ...

Embodiment 2

[0067] The composition of the alloy of this embodiment is shown in Table 4. After batching and vacuum induction melting according to the alloy composition, it is cast into a master alloy ingot with a size of φ80×500mm, then polished to remove scale, and cut into suitable blocks for preparing single crystal rods.

[0068] The single crystal rod is prepared in a directional solidification furnace by the spiral crystal selection method. The temperature gradient of the single crystal growth furnace is 50K / cm, the pouring temperature is 1500°C, and the shell temperature is kept consistent with the pouring temperature; after standing for 10 minutes, pull with a predetermined single crystal growth rate of 4mm / min to prepare a single crystal rod.

[0069] Table 4 The chemical composition of the alloy in this embodiment (wt%)

[0070] chemical composition

[0071] The heat treatment system is as follows:

[0072] 1240°C / 3h+1270°C / 6h (air cooling)+1150°C / 2h (air cooling)+86...

Embodiment 3

[0079] The composition of the alloy of this embodiment is shown in Table 6. For the convenience of comparison, the chemical compositions of K438 alloy and DZ125L alloy are also listed in Table 6.

[0080] The single crystal rod is prepared in a directional solidification furnace by the spiral crystal selection method. The temperature gradient of the single crystal growth furnace is 70K / cm, the pouring temperature is 1600°C, and the shell temperature is kept consistent with the pouring temperature; after standing for 10 minutes, pull with a predetermined single crystal growth rate of 6mm / min to prepare a single crystal rod.

[0081] Table 6 Chemical composition (wt%) of this embodiment and comparative alloy K438 and DZ125L

[0082] Alloy

Cr

co

Mo

Ta

W

Al

Ti

Fe

C

B

Ni

This example

12

9

2

5

4

4.5

2.5

-

0.01

0.005

Remain

K438

16

8.5

1.7

1.7

2.5

3...

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Abstract

The invention relates to the field of single crystal superalloys, particularly to a high-strength hot-corrosion-resistant Ni-based single crystal superalloy and a preparation method, and is mainly applied to high-temperature components applied to various marine environments and turbine high-temperature components of ground industrial gas turbines. The superalloy comprises chemical components in percentage by weight as follows: 11-15% of Cr, 5-9% of Co, 0.5-2.0% of Mo, 3.0-5.0% of W, 4.5-7.0% of Ta, 3.5-5.6% of Al, 2.3-3.7% of Ti and the balance of Ni. A vacuum induction furnace is used for smelting, a mother alloy is cast firstly, and then the high-strength hot-corrosion-resistant single crystal superalloy is prepared according to a single crystal growth technology and a heat treatment system. The Cr and refractory metallic elements with higher content are selected, but the content of the Ti element is reduced. Meanwhile, the crystal boundary is eliminated through a single crystal technology, so that the hot corrosion resistance, the high-temperature mechanical property and the structure stability of the alloy are further improved.

Description

technical field [0001] The invention relates to the field of single crystal superalloys, in particular to a high-strength thermal corrosion-resistant nickel-based single crystal superalloy and a preparation method thereof, which are mainly applicable to high-temperature components used in various marine environments and turbine high-temperature components of ground industrial gas turbines. Background technique [0002] Aeroengines, ship engines, and ground industrial gas turbine high-temperature components used in marine environments must have good high-temperature mechanical properties and special thermal corrosion resistance. [0003] In the development process of superalloys, the temperature bearing capacity and performance of alloys are mainly improved by improving the composition and process of alloys. From the 1940s to the mid-1950s, alloys were developed primarily by tweaking their composition to improve performance. In the late 1950s, the performance of the alloy wa...

Claims

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Application Information

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IPC IPC(8): C30B29/52C30B11/00C22C19/05
Inventor 郑启韦华张洪宇吴多利孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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