Low-rhenium third-generation nickel-based single crystal alloy and preparation method thereof

A nickel-based single crystal and alloy technology, applied in the field of nickel-based superalloys, can solve the problems of poor stability and difficult to achieve the performance of third-generation alloys

Active Publication Date: 2016-10-12
JIANGSU UNIV
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  • Abstract
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Problems solved by technology

Although this method reduces the cost of the alloy to a certain extent, the high content of Cr in the alloy tends to make the stability of the alloy poor at high temperatures, and the content of refractory elements (Re+W+Mo+Ta) is only about 14%. , it is difficult to achieve the performance of the third generation alloy

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  • Low-rhenium third-generation nickel-based single crystal alloy and preparation method thereof
  • Low-rhenium third-generation nickel-based single crystal alloy and preparation method thereof
  • Low-rhenium third-generation nickel-based single crystal alloy and preparation method thereof

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Embodiment Construction

[0056] Follow the attached figure 2 The present invention is described in further detail:

[0057] Ingredient Design

[0058] According to the description of the invention, the theoretical design of the alloy is carried out by using the average electron vacancy number and the d-electron theory, and a suitable composition range is selected;

[0059]

[0060] Where: mi is the molar mass fraction of elements in the alloy;

[0061] (Nv) the number of electron vacancies of each element of i;

[0062] Ci represents the molar mass fraction of elements in the alloy;

[0063] Mdi represents the corresponding Md value of each element in the alloy;

[0064] Boi represents the corresponding Bo value of each element in the alloy.

[0065] Table 1 The average number of electron vacancies, d-level orbital energies and covalent bond energies corresponding to each element

[0066]

[0067] According to the data given above, the average number of electron vacancies, d-level orbital...

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Abstract

The invention belongs to the field of nickel-based superalloys, in particular to a low-rhenium third-generation nickel-based single crystal alloy and a preparation method thereof. Its composition includes Cr, Co, W, Mo, Re, Ta, Al, Hf and Ni, among which Re: 3.0‑4.5%, and it is characterized in that the value of Ta / (W+Mo) is controlled between 1:1‑2 . The main steps of the invention are to use a vacuum consumable furnace to prepare the raw material into a consumable electrode, and to prepare a master alloy through multiple tests; then use the spiral crystal selection method to prepare a single crystal test rod through a directional solidification furnace, and finally test the single crystal at high temperature Alloy test bars were heat treated. The alloy of the present invention mainly improves the durable strength and hot corrosion resistance of the alloy by adjusting the ratio of Ta / (W+Mo), so that the alloy meets the performance of the third-generation nickel-based single crystal superalloy, and contains less Re, and can be used at 900 ° C There is no TCP phase precipitation during long-term aging, and the stability is good.

Description

technical field [0001] The invention belongs to the field of nickel-based superalloys, in particular to a low-rhenium third-generation nickel-based single crystal alloy and a preparation method thereof. Background technique [0002] Nickel-based single crystal superalloys have excellent comprehensive properties such as creep resistance, fatigue resistance, oxidation resistance and corrosion resistance, and are widely used in blade parts of aero-engines and industrial gas turbines; The content of refractory elements Re, Mo, W, Ta, etc. is constantly increasing, especially the element Re plays an important role. Three generations of nickel-based single crystal superalloys. [0003] Due to the progress of heat treatment technology and alloying theory, the design and preparation technology of nickel-based single crystal alloys has become more common. The composition of the nickel-based single crystal alloy designed by the method is as follows (wt%): Cr2-4%, Co11-13%, W5-7%, Mo...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/03C30B29/52C30B11/00
Inventor 赵玉涛徐凯梁向锋王安东张弛
Owner JIANGSU UNIV
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