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High strength and completely antioxidative third generation monocrystalline high temperature alloy and preparation method thereof

A superalloy and anti-oxidation technology, applied in the field of third-generation single crystal superalloy and aero-engine blade materials, can solve the problems of unstable microstructure and high cost, achieve easy control of solution treatment, good high temperature strength, low content effect

Inactive Publication Date: 2012-04-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-cost, high-strength and fully anti-oxidation third-generation single crystal superalloy, which solves the problems of high cost and unstable microstructure in the prior art, and its service temperature can reach 1100 ℃ above

Method used

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  • High strength and completely antioxidative third generation monocrystalline high temperature alloy and preparation method thereof
  • High strength and completely antioxidative third generation monocrystalline high temperature alloy and preparation method thereof
  • High strength and completely antioxidative third generation monocrystalline high temperature alloy and preparation method thereof

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Embodiment

[0042] 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.

[0043]Table 1 The chemical composition (wt%) of the embodiment of the present invention and comparative alloy CMSX-4 and CMSX-10

[0044]

[0045] 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.

[0046] 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...

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Abstract

The invention relates to the field of high strength monocrystalline high temperature alloy and especially provides a high strength and completely antioxidative third generation monocrystalline high temperature alloy with low cost, and is mainly suitable for blade material of an aircraft engine used at a temperature higher than 1100 DEG C. The alloy comprises chemical components (wt%) of 3-5% of Cr, 5-12% of Co, 6-8% of W, 0.1-2% of Mo, 4.5-5.5% of Re, 5.5-7% of Al, 6-10% of Ta and the balance of Ni. The preparation method is as below: a monocrystalline blade or a testing rod is prepared at a monocrystalline growth furnace temperature gradient of 40K / cm-80K / cm, a cast temperature of 1480-1550 DEG C, with a shuttering temperature and a cast temperature kept at the same and a growth rate of 4-8mm / min; then, the alloy is treated with solid solution homogenizing treatment, high temperature aging treatment and low temperature aging treatment to gain high lasting intensity and creep limit. The alloy has a life no less than 200 h under a lasting condition of 1100 DEG C / 140 MPa and a lasting intensity similar to CMSX-10 and good high temperature antioxidative property, which is good surface stability Besides, a heat treatment window is wide, and the solid solution treatment is easy to control.

Description

technical field [0001] The invention relates to the fields of high-strength single-crystal superalloys and their preparation and heat treatment, and in particular provides a low-cost, high-strength and completely anti-oxidation third-generation single-crystal superalloy, 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 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 (CM...

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Application Information

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