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High-strength and tissue stable nickel-base single crystal superalloy and preparation method thereof

A nickel-based single crystal, superalloy technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problems of high cost and unstable microstructure, and achieve low cost and excellent high temperature performance. and single crystal process performance, the effect of low Ru content

Inactive Publication Date: 2017-05-31
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

[0004] The purpose of the present invention is to provide a nickel-based single crystal superalloy with high strength and stable structure and its preparation method, which can solve the problems of high cost and unstable microstructure in the prior art, and its service temperature can reach 1100°C above

Method used

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  • High-strength and tissue stable nickel-base single crystal superalloy and preparation method thereof
  • High-strength and tissue stable nickel-base single crystal superalloy and preparation method thereof
  • High-strength and tissue stable nickel-base single crystal superalloy and preparation method thereof

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Embodiment 1

[0048] The specific composition of the alloy of the present invention is shown in Table 1. For the convenience of comparison, the chemical composition of CMSX-4 and CMSX-10 is also listed in Table 1.

[0049] Table 1 The present embodiment and the chemical composition (wt%) of comparative alloy CMSX-10 and EPM102

[0050]

[0051] 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.

[0052] 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; after standing for 10 minutes, pull with a predetermined single crystal growth rate of 5mm / min to prepare a si...

Embodiment 2

[0066] The difference from Example 1 is that the composition of the alloy in this example is shown in Table 4, and the composition of Example 1 is also listed in the table for the convenience of comparison.

[0067] 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 60K / cm, the pouring temperature is 1550°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 5mm / min to prepare a single crystal rod.

[0069] Table 4 present embodiment and embodiment 1 and EPM102 alloy chemical composition (wt%)

[0...

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Abstract

The invention relates to the field of high-strength single crystal superalloys and particularly provides a high-strength and tissue stable nickel-base single crystal superalloy with the temperature capability reaching to 1,150 DEG C. The high-strength and tissue stable nickel-base single crystal superalloy is mainly suitable for blade materials, used at the temperature of 1,100 DEG C or above, of an aero-engine. The superalloy comprises chemical components (wt%): 3%-5% of Cr, 6%-13% of Co, 6%-8% of W, 0.1%-2% of Mo, 4.5%-6% of Re, 2%-4% of Ru, 5.5%-6.5% of Al, 6%-10% of Ta, 0%-0.2% of Hf and the balance Ni. A preparation method comprises the steps that the temperature gradient range of a single crystal growth furnace is 40K / cm-80K / cm, the pouring temperature is 1,480 DEG C-1,550 DEG C, the mold shell temperature and the pouring temperature keep consistent, and a single crystal blade or a test bar is prepared within the growth rate range of 4mm / min-8mm / min; and then, solid solution homogenization treatment, high-temperature aging treatment and low-temperature aging treatment are carried out so that the superalloy can have high endurance strength. The service life of the superalloy is 100 h or longer under the endurance condition of 1,140 DEG C / 137 MPa, and the endurance strength of the superalloy is equivalent to that of an EPM102 alloy; the high-temperature tissue stability is good; and a heat treatment window is wide, and solution treatment is easy to control.

Description

technical field [0001] The invention relates to the technical field of nickel-based single crystal superalloys, in particular to a nickel-based single crystal superalloy with high strength and stable structure and a preparation method thereof, which is mainly suitable for blade materials of aeroengines used at temperatures above 1100°C. Background technique [0002] Due to its superior comprehensive performance, nickel-based single crystal superalloy is the material of choice for the key components with the highest temperature and the largest stress load in advanced engines at present and for a long time to come. [0003] In the process of the development of single crystal superalloys, due to the higher and higher requirements on the use temperature, the content of refractory elements in the alloys gradually increased, especially Re, W, Mo, Ta, etc., the typical first generation (CMSX- 2), the second generation (CMSX-4), the third generation (CMSX-10) single crystal superall...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22F1/10C30B29/52C30B33/02C30B11/00
CPCC22C19/057C22F1/10C30B11/00C30B29/52C30B33/02
Inventor 金涛刘金来谭喜鹏孟杰王新广刘纪德赵乃仁孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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