Co-Al-W based high-temperature alloy based on cluster and linking atom model

A high-temperature alloy and atomic technology, which is applied in the field of high-temperature alloys, can solve the problems of narrow two-phase regions, insufficient, and γ′-phase unstable alloy high-temperature strength, etc.

Inactive Publication Date: 2018-03-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the γ′ phase is stable at 1173K, but metastable at 1273K, and the γ / γ′ two-phase region in the phase diagram is very narrow
[0006] Although the new γ′-strengthened cobalt-based superalloy is considered to be a potential next-generation superalloy, there are mainly three deficiencies in the following three aspects: the narrow γ / γ′ two-phase region, the instability of the γ′ phase at high temperatures, and the high temperature of the alloy. Less strong than nickel-based superalloys

Method used

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  • Co-Al-W based high-temperature alloy based on cluster and linking atom model
  • Co-Al-W based high-temperature alloy based on cluster and linking atom model
  • Co-Al-W based high-temperature alloy based on cluster and linking atom model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 Co 80.92 Al 9 W 8 Ta 2 B 0.08 alloy:

[0020] 1. Alloy preparation: change the elements from atomic percentage to mass percentage for proportioning; use a non-consumable vacuum melting furnace to melt the prepared alloy raw materials several times under the protection of Ar gas atmosphere to achieve the purpose of uniform composition, and finally get alloy ingot. After the ingot is obtained, the measured actual composition is compared with the nominal composition, and the experimental error is controlled within the designed range.

[0021] 2. Observation of the as-cast structure: metallographic preparation of the as-cast sample is carried out, and the structure of the sample is observed with a metallographic microscope.

[0022] 3. Use DSC to measure the transformation point of the alloy, and set the heating / cooling rate to 5 K / min. The solidus temperature of the alloy is 1687K, the liquidus temperature is 1712K and the solid solution temperature of the...

Embodiment 2

[0028] Example 2 Co 81.5 Al 9.5 W 6 Ta 3 Cr 3 Coideal1 alloy

[0029] 1. Alloy preparation: change the elements from atomic percentage to mass percentage for proportioning; use a non-consumable vacuum melting furnace to melt the prepared alloy raw materials several times under the protection of Ar gas atmosphere to achieve the purpose of uniform composition, and finally get alloy ingot. After the ingot is obtained, the measured actual composition is compared with the nominal composition, and the experimental error is controlled within the designed range.

[0030] 2. Observation of the as-cast structure: metallographic preparation of the as-cast sample is carried out, and the structure of the sample is observed with a metallographic microscope.

[0031]3. Use DSC to measure the transformation point of the alloy, and set the heating / cooling rate to 5 K / min.

[0032] 4. Formulate a heat treatment system, including solution treatment temperature and duration, and aging temp...

Embodiment 3

[0033] Example 3 Co 69.5 Ni 9 Al 9.5 W 6 Ta 3 Cr 6 Coideal1 alloy

[0034] 1. Alloy preparation: change the elements from atomic percentage to mass percentage for proportioning; use a non-consumable vacuum melting furnace to melt the prepared alloy raw materials several times under the protection of Ar gas atmosphere to achieve the purpose of uniform composition, and finally get Alloy ingots. After the ingot is obtained, the measured actual composition is compared with the nominal composition, and the experimental error is controlled within the designed range.

[0035] 2. Observation of the as-cast structure: metallographic preparation of the as-cast sample is carried out, and the structure of the sample is observed with a metallographic microscope.

[0036] 3. Use DSC to measure the transformation point of the alloy, and set the heating / cooling rate to 5 K / min.

[0037] 4. Formulate a heat treatment system, including solution treatment temperature and duration, and ag...

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Abstract

The invention discloses Co-Al-W based high-temperature alloy based on a cluster and linking atom model, and belongs to the field of high-temperature alloy. The ideal components of the gamma' phase strengthened Co-Al-W based high-temperature alloy are determined, that is, alloy elements are divided into three classes: the atomic percent content of the Al element is 9.4+ / -0.6 at%, solid solution strengthening elements include Co, Ni, Ru, Ir, Cr, Fe and Re of which the atomic percent content is 81.2+ / -1 at%, precipitation strengthening elements include W, Mo, Ta, Ti, Nb, V, Si, Sc and Hf of whichthe atomic percent content is 9.4+ / -0.6 at%, and in addition, not less than 0.5 at% of B, Zr, Y, Mn, La, C, Mg, Cu and other elements are added to the alloy. The alloy has good temperature capabilityand environment resistance.

Description

technical field [0001] The invention relates to the composition of a Co-Al-W base superalloy designed by using a "cluster plus connecting atom" model, belongs to the field of superalloys, and is expected to become a new generation of main practical superalloys. Background technique [0002] Superalloys refer to alloys that work at temperatures above 600°C. They have excellent high temperature resistance, fatigue resistance, oxidation resistance and corrosion resistance, good structural stability and comprehensive mechanical properties. According to the classification of matrix elements, superalloys are mainly divided into iron-based superalloys, cobalt-based superalloys and nickel-based superalloys. Among them, nickel-based superalloys are the most widely used, mainly in aerospace, petrochemical, civil automobile and nuclear industries. [0003] However, with the continuous improvement of the efficiency of aerospace turbine engines and land generators in recent years, the op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C1/02C22F1/10
CPCC22C19/07C22C1/02C22F1/10
Inventor 马启慧董红刚张宇王清董闯
Owner DALIAN UNIV OF TECH
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