Fourth-generation single-crystal high temperature alloy with high strength and stable structure and preparation method thereof

A high-temperature alloy, high-strength technology, applied in the field of high-strength single-crystal superalloy and its preparation and heat treatment, can solve the problems of unstable microstructure and high cost, and achieve good structure stability, low cost, and easy heat treatment process. Effect

Inactive Publication Date: 2013-11-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Fourth-generation single-crystal high temperature alloy with high strength and stable structure and preparation method thereof
  • Fourth-generation single-crystal high temperature alloy with high strength and stable structure and preparation method thereof
  • Fourth-generation single-crystal high temperature alloy with high strength and stable structure and preparation method thereof

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Embodiment 1

[0041] 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.

[0042] Table 1 The chemical composition (wt%) of this embodiment and comparative alloys CMSX-10 and EPM102

[0043]

[0044] 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.

[0045] 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 c...

Embodiment 2

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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 high temperature alloys and especially provides a fourth-generation single-crystal high temperature alloy with high strength and a stable structure and a preparation method thereof. The alloy is mainly applicable to aero-engine blade materials used at a temperature higher than 1100 DEG C. Chemical components of the alloy comprise, by weight, 3 to 5% of Cr, 5 to 12% of Co, 6 to 8% of W, 0.1 to 2% of Mo, 4.5 to 6% of Re, 2 to 4% of Ru, 5.5 to 6.5% of Al and 6 to 10% of Ta, with the balance being Ni. The preparation method comprises the following steps: preparing a single-crystal blade or test rod under the conditions that temperature gradient of a single crystal growth furnace is in a range of 40 K / cm to 80 K / cm, casting temperature is 1480 to 1550 DEG C, shuttering temperature is consistent with the casting temperature and a growth rate is 4 to 8 mm / min; and then carrying out solid solution homogenization treatment, high temperature aging treatment and low temperature aging treatment so as to allow the alloy provided by the invention to have high endurance strength. The alloy has a life of no less than 100 h in endurance conditions of a temperature of 1140 DEG C and a pressure of 137 MPa and has endurance strength equivalent to the endurance strength of an EPM102 alloy; and the alloy has the advantages of good structure stability at a high temperature, a wide heat treatment window and easily controllable solid solution treatment.

Description

technical field [0001] The invention belongs to the fields of high-strength single-crystal superalloys and their preparation and heat treatment, and in particular provides a fourth-generation single-crystal superalloy with low cost, high strength and complete oxidation resistance, which is mainly suitable for aviation used at temperatures above 1100°C. engine blade material. 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 for the use temperature, the content of refractory elements in the alloy gradually increased, especially Re, W, Mo, Ta, etc., the typical first generation (CMSX- 2) The content of refractory elements (Re+W+Mo+Ta)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22F1/10C30B29/52C30B11/00C30B33/02
Inventor 金涛刘金来谭喜鹏孟杰赵乃仁孙晓峰管恒荣胡壮麒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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