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High endurance strength and excellent oxidation resistance third generation single crystal high-temperature alloy and preparation thereof

An oxidation resistance, high temperature alloy technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems of high cost and unstable microstructure, achieve good high temperature strength, easy control of solution treatment, The effect of low Re content

Inactive Publication Date: 2019-04-05
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 object of the present invention is to provide a low-cost, high-strength and fully anti-oxidation third-generation single crystal superalloy to solve the problems of high cost and unstable microstructure in the prior art, and its service temperature can reach Above 1100℃

Method used

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  • High endurance strength and excellent oxidation resistance third generation single crystal high-temperature alloy and preparation thereof
  • High endurance strength and excellent oxidation resistance third generation single crystal high-temperature alloy and preparation thereof
  • High endurance strength and excellent oxidation resistance third generation single crystal high-temperature alloy and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The specific composition of the alloy in this example 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.

[0057] Table 1 The chemical composition (wt%) of embodiment 1 of the present invention and comparative alloy CMSX-4 and CMSX-10

[0058]

[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 prepar...

Embodiment 2

[0076] The alloy composition of Example 2 is shown in Table 4, and the composition of Example 1 is also listed in the table for comparison. Example 2 mainly studies the influence of changes in the content of the key element Al on the durable performance of the alloy. The content of Al takes the lower limit of the preferred range, and the contents of other elements are the same as in Example 1.

[0077] The alloy chemical composition (wt%) of table 4 embodiment 2

[0078]

[0079] The master alloy ingot of Example 2 was refined according to the composition in Table 4, and a single crystal rod was prepared in a directional solidification furnace by using the spiral crystal selection method. The directional solidification process is the same as in Example 1, 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 at ...

Embodiment 3

[0088] The alloy composition of Example 3 is shown in Table 5, and its preparation method and heat treatment system are the same as those of Example 1.

[0089] The alloy chemical composition (wt%) of table 5 embodiment 3

[0090]

[0091] The above alloys have high durable life and durable plasticity, and have the possibility of being used above 1100°C.

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Abstract

The invention provides a low cost, high strength and fully oxidation resistance third generation single crystal high-temperature alloy. The high-temperature alloy is mainly suitable for aircraft engine blade materials used at the temperature of 1100 DEG C or above. The alloy is prepared from the chemical components in percentage by weight: 3-5% of Cr, 5-12% of Co, 6-8% of W, 0.1-2% of Mo, 4.5-5.5%of Re, 5.5-6.5% of Al, 6-10% of Ta, 0-0.6% of Nb, 0-0.2% of Hf, 0-0.05% of Y, 0-0.04% of C, and the balance of Ni. A preparation method comprises the steps that single crystal blades or test rods areprepared within a temperature gradient range of a single crystal growth furnace being 40 K / cm-80 K / cm, at a casting temperature of 1500-1550 DEG C, under the condition that a mould shell temperatureis consistent with the casting temperature, and within the growth rate range of 4-8 mm / min. Then after solid solution homogenization treatment, high temperature aging treatment, and low temperature aging treatment, the alloy has high endurance strength and creep limit. The service life is greater than or equal to 200 h at the endurance condition of 1100 DEG C / 140 MPa, and the endurance strength ofthe alloy is comparable to that of CMSX-10; and the performance of high temperature oxidation resistance is good, specifically, surface stability is good. A heat treatment window is wide, and solid solution treatment is easy to control.

Description

technical field [0001] The invention relates to the field of high-strength single-crystal superalloy and its 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 aeroengines used above 1100°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 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 supe...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/02C22F1/10C30B29/52C30B11/00
CPCC22C1/023C22C19/057C22F1/10C30B11/00C30B29/52
Inventor 刘金来周亦胄孟杰孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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