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A single crystal superalloy with low density and excellent thermal corrosion resistance and its preparation process

A high-temperature alloy and thermal corrosion technology, which is applied in the directions of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems of high cost and difficulty in taking into account thermal corrosion resistance, etc., and achieve low Ta content, excellent thermal corrosion resistance, The effect of low density

Active Publication Date: 2022-03-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a single crystal superalloy with low density and excellent thermal corrosion resistance and its preparation process to solve the problems of high cost, density, and difficulty in taking into account thermal corrosion resistance in the prior art. The temperature can reach 1000°C, mainly suitable for blade materials of turbine engines used above 900°C and below 1000°C

Method used

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  • A single crystal superalloy with low density and excellent thermal corrosion resistance and its preparation process
  • A single crystal superalloy with low density and excellent thermal corrosion resistance and its preparation process
  • A single crystal superalloy with low density and excellent thermal corrosion resistance and its preparation process

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Embodiment 1

[0050] The specific composition of the alloy in this example is shown in Table 1. For the convenience of comparison, the chemical composition of K438G and DZ438G is also listed in Table 1.

[0051] Table 1 The chemical composition (wt%) of embodiment 1 of the present invention and comparison alloy K438G and DZ438G

[0052]

[0053] 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.

[0054] 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 mold shell temperature is kept consistent with the pouring temperature; after standing for 5 minutes, pull with a predetermined single crystal growth rate of 6mm / min to prepare...

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Abstract

The invention discloses a single-crystal high-temperature alloy with low density and excellent heat-corrosion resistance, and belongs to the field of heat-corrosion-resistant single-crystal high-temperature alloys and their preparation and heat treatment. Alloy chemical composition: Cr 15.5-16.5%, Co 8.0-9.0%, W 5.6-6.4%, Al 3.6-4.2%, Ti 3.6-4.2%, Ta 0.7-1.2%, and the rest is Ni. It is prepared by a single crystal growth process, the temperature gradient of the single crystal growth furnace is 40K / cm-80K / cm, the pouring temperature is 1500-1550°C, and it is used after heat treatment. The alloy of the invention has a service life of more than 300h under the persistent condition of 1000°C / 137MPa, and its temperature bearing capacity is about 20°C higher than that of the DZ438G alloy; its high-temperature oxidation resistance and thermal corrosion resistance are better than those of the thermal corrosion resistant alloys K438G and DZ438G. The heat treatment window is wide, and the solution treatment is easy to control.

Description

technical field [0001] The invention relates to the field of heat-corrosion-resistant single-crystal superalloy and its preparation and heat treatment, in particular to a single-crystal superalloy with low density and excellent heat-corrosion resistance and its preparation process, which is mainly suitable for turbine engines used below 1000°C leaf 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 turbine engines at present and for a long time to come. [0003] The development of single crystal superalloys can be divided into three types: (1) High-strength single crystal alloys: the method of alloying is to add a considerable amount of Al elements to ensure the number of γ′ strengthening phases; at the same time, adding a large amount of W, Mo , Ta, Re and other refractory metal elem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/52C30B11/00C30B33/02C22C19/05
CPCC30B29/52C30B11/00C30B33/02C22C19/056
Inventor 刘金来赵乃仁王新广周亦胄孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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