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Nickel base single crystal superalloy with low cost and low density

A nickel-based single crystal, superalloy technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems of scarcity of Re resources, high price, etc., to achieve excellent durable performance, improve yield, good single crystal growth effect

Active Publication Date: 2015-06-10
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] However, Re, the key strengthening element in single crystal alloys, is scarce and expensive, and is a strategic resource.

Method used

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  • Nickel base single crystal superalloy with low cost and low density
  • Nickel base single crystal superalloy with low cost and low density
  • Nickel base single crystal superalloy with low cost and low density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-11

[0044] Examples 1-11: See Table 1 for the chemical composition of the nickel-based single crystal superalloy samples.

[0045] For the convenience of comparison, the chemical compositions of typical third-generation nickel-based single crystal superalloys CMSX-10, Rene N6, and TMS-75 are also listed in Table 1. The "yu" in the column of Ni content in Table 1 means "yu quantity". The typical microstructure of the alloy as cast and heat treated is shown in Figure 1-3 . See Table 2 for the density data of the nickel-based single crystal superalloy described in Examples 3, 5, 6, and 8. The density of the nickel-based single crystal superalloy described in Examples 1-11 is significantly lower than that of CMSX-10, Rene N6, TMS-75.

Embodiment 3

[0047] The tensile properties of the alloy of Example 3 are shown in Table 4. The durability properties of Examples 5, 10, and 11 are shown in Tables 5, 6, and 7, respectively.

[0048] After the alloy is completely heat-treated, long-term aging experiments at 900°C and 1000°C are carried out, and no TCP phase precipitates after long-term aging for 1000h. The microstructure of the alloy after long-term aging Figure 5-8 . However, after the alloy of Example 8 was aged at 1100°C for 10 hours, a large amount of TCP phases precipitated in the structure, see Figure 9 .

[0049] Table 1 List of chemical components of the nickel-based single crystal superalloy described in Examples 1-11 (wt%)

[0050]

[0051] Table 2 Density list of embodiment 3, 5, 6, and 8 alloys

[0052] alloy Density (g / cm 3 ) No.3 8.85 No.5 8.84 No.6 8.85 No.8 8.85 CMSX-10 9.05 Rene N6 8.97 TMS-75 8.89

[0053] Table 3 The list of durable pro...

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Abstract

A nickel base single crystal superalloy with low cost and low density comprises, in percentage by weight, 2.5-4.5% of Cr, 7.0-11.0% of Co, 0.5-2.3% of Mo, 5.0-7.5% of W, 7.0-10.0% of Ta, 3.3-4.5% of Re, 5.0-7.0% of Al, 0-0.5% of Ti, 0-0.2% of Hf, 0-0.05% of C, 0-0.01% of B, and the balance being Ni. Compared with the conventional nickel base single crystal superalloys, the nickel base single crystal superalloy in the invention has excellent stress rupture property and tensile property and the cost is reduced obviously.

Description

technical field [0001] The invention relates to the technical field of nickel-based single-crystal high-temperature alloys, and in particular provides a low-cost, low-density nickel-based single-crystal high-temperature alloy mainly suitable for components subjected to high stress at high temperatures. Background technique [0002] The development of technical fields such as high thrust-to-weight ratio aero-engines requires materials with higher temperature bearing capacity. Under the current technical conditions, the solid solution strengthening effect of refractory elements W, Mo, Ta, Re, etc. in nickel-based single crystal superalloys is becoming more and more important. Especially the addition of Re significantly improves the high temperature strength of the alloy. [0003] Typical first-generation nickel-based single-crystal superalloys do not contain Re, second-generation nickel-based single-crystal superalloys contain 3wt% Re, and third-generation nickel-based single...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C30B29/52
Inventor 张健王莉楼琅洪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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