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Low-cost nickel-base single crystal high-temperature alloy and preparation method thereof

A nickel-based single crystal and superalloy technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problem of increasing production costs of single crystal superalloys, reducing the performance of single crystal alloys, and is not conducive to energy conservation, etc. problems, achieve good structural stability, improve high temperature strength, and good performance of single crystal casting process

Active Publication Date: 2013-06-26
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

This complex heat treatment process greatly increases the production cost of single crystal superalloys, and is not conducive to saving energy
At the same time, because single crystal superalloys are prone to recrystallization defects during high-temperature solution treatment, recrystallization seriously reduces the performance of single crystal alloys, and recrystallization is not allowed in single crystal superalloys in production

Method used

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  • Low-cost nickel-base single crystal high-temperature alloy and preparation method thereof
  • Low-cost nickel-base single crystal high-temperature alloy and preparation method thereof
  • Low-cost nickel-base single crystal high-temperature alloy and preparation method thereof

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Embodiment 1

[0024] The composition of the alloy (No.1 alloy) of the present invention is shown in Table 1, and a single crystal test rod was prepared by a liquid metal cooling (LMC) directional solidification process. Its as-cast structure and heat-treated structure are as follows: figure 1 (a, c and d) shown. The as-cast microstructure of the single crystal test bar prepared by the high-speed solidification process (HRS) is as follows: figure 1 (b) shown.

[0025] Table 1 Composition of single crystal alloys (wt%)

[0026]

Embodiment 2

[0028] The composition of the alloy (No.2 alloy) of the present invention is shown in Table 2, and the preparation process adopts the LMC method. The density of the alloy is: 8.48g / cm 3 . The thermal conductivity, specific heat capacity and thermal diffusivity of the alloy (cast state) are shown in Table 3.

[0029] Table 2 Composition of single crystal alloys (wt%)

[0030]

[0031] Table 3 Thermal conductivity, specific heat capacity, and thermal diffusivity of single crystal alloys

[0032]

Embodiment 3

[0034] The composition of the alloy (No.3 alloy) of the present invention is shown in Table 4, and the preparation process of the single crystal test rod is the same as in Example 2. The durability properties of the as-cast alloys are shown in Table 5.

[0035] Table 4 Composition of single crystal alloys (wt%)

[0036]

[0037] Table 5 Durability properties of single crystal alloys

[0038] temperature(℃)

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Abstract

The invention discloses a low-cost nickel-base single crystal high-temperature alloy and a preparation method thereof. The low-cost nickel-base single crystal high-temperature alloy comprises the following components in percentage by weight: 0.1-0.18% of C, 4.3-5.6% of Cr, 8-10% of Co, 10.9-12.5% of W, 0.9-1.3% of Mo, 1.2-1.6% of Nb, 5.65-6.25% of Al, 0.9-1.3% of Ti, 0.01-0.1% of Hf, 0.001-0.015% of B, 0.0005-0.025% of Ce, 0.0005-0.025% of Y and the balance of Ni. The alloy has the advantages of low preparation cost, high creep strength, high fatigue resistance, high structure stability, favorable single crystal casting property, favorable weldability and favorable coating property, and can be directly used in an as-cast state.

Description

technical field [0001] The invention belongs to the technical field of nickel-based single-crystal superalloy and its preparation, and in particular relates to a low-cost nickel-based single-crystal superalloy and its preparation method. The alloy is suitable for making aeroengine gas turbine rotor blades, guide vanes and other high-temperature components . Background technique [0002] In the whole field of superalloys, nickel-based superalloys occupy a particularly important position. Compared with iron-based and cobalt-based superalloys, nickel-based superalloys have higher high-temperature strength and structural stability, and are widely used in the production of hot-end parts of aviation jet engines and industrial gas turbines. Since the transverse grain boundary perpendicular to the stress direction is the weak link of the material at high temperature, the elimination of the transverse grain boundary can significantly improve the overall performance of the alloy. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/52C30B11/00C30B33/02C22C19/05
Inventor 申健张健楼狼洪张少华
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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