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A high-strength hot-corrosion-resistant nickel-based single crystal superalloy

A nickel-based single crystal and high-temperature alloy technology, which is applied in the directions of single crystal growth, single crystal growth, crystal growth, etc., can solve the problem of few types of hot corrosion-resistant single crystal alloys, and achieve excellent hot corrosion resistance and stable structure. Effect

Active Publication Date: 2016-01-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are few types of high-strength hot-corrosion-resistant single crystal alloys in China at present.

Method used

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  • A high-strength hot-corrosion-resistant nickel-based single crystal superalloy
  • A high-strength hot-corrosion-resistant nickel-based single crystal superalloy
  • A high-strength hot-corrosion-resistant nickel-based single crystal superalloy

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Experimental program
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Effect test

Embodiment 1-8

[0029] See Table 1 for the chemical composition of the nickel-based single crystal superalloy sample of the present invention. For the convenience of comparison, the chemical compositions of typical first-generation nickel-based single crystal superalloys DD3, DD26, DD402 and DD8 are also listed in Table 1.

[0030] Table 1 Alloy of the present invention (embodiment 1-8) and the chemical composition list (wt.%) of DD3, DD26, DD402, DD8

[0031] Alloy

[0032] Note: "Remainder" in the column of Ni content in the table means "balance".

Embodiment 9

[0034] The alloy sample of Example 3 of the present invention was subjected to a durability test after heat treatment and machining, and the results are shown in Table 2. The Larson-Miller curve comparison of Example 3 alloy of the present invention and typical first-generation single crystal superalloys DD3, DD26, DD402 and DD8 is shown in figure 1 . The durability performance of the alloy of the present invention is equivalent to that of DD402, slightly higher than that of other single crystal superalloys.

[0035] Table 2 Durability of the alloy of Example 3 of the present invention

[0036]

Embodiment 10

[0038] The 900°C hot corrosion performance of the alloy of Example 4 of the present invention is compared with the high-strength DZ125 and the hot corrosion alloy M38, see figure 2 .

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Abstract

The invention provides a high-strength hot-corrosion-resistant nickel-base monocrystal high-temperature alloy which comprises the following components in percentage by mass: 10.0-15.0% of Cr, 8.0-12.0% of Co, 0.5-3.0% of Mo, 3.0-6.0% of W, 4.0-7.0% of Ta, 3.0-5.0% of Al, 3.0-5.0% of Ti, 0-0.4% of C and the balance of Ni, wherein 6.5<=Al+Ti<=9, and Al / Ti<=1. The alloy has the advantages of excellent hot corrosion resistance, high high-temperature mechanical properties and good structure stability. The high-strength hot-corrosion-resistant nickel-base monocrystal high-temperature alloy is applicable to ground and naval gas turbine high-temperature components, and is also applicable to spaceflight and aircraft engine high-temperature components.

Description

technical field [0001] The invention belongs to the technical field of nickel-based single-crystal high-temperature alloys, and specifically relates to a high-strength nickel-based single-crystal high-temperature alloy mainly suitable for components that bear high stress under high-temperature thermal corrosion conditions. Background technique [0002] The development of scientific and technological fields such as carrier-based aircraft and ground gas turbines in the marine environment requires that engine materials not only have high mechanical properties, but also have certain thermal corrosion resistance. At present, the first generation of single crystal alloys developed in my country mainly include DD3, DD26, DD402 and DD8 alloys. Except for DD8, these alloys have poor hot corrosion resistance. Although DD8 alloy has strong hot corrosion resistance, its strength is obviously lower than other single crystal alloys. Therefore, there are few types of high-strength hot-co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C30B29/52
Inventor 王栋刘畅张功张健楼琅洪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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