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Precipitation strengthening type high-temperature high-entropy alloy for in-situ precipitation of carbide and preparation method thereof

A technology for precipitation of carbides and precipitation strengthening, which can solve the problems that the final alloy content is not easy to guarantee, reduce the high-temperature plasticity of the alloy, and the difficulty of machining the alloy, etc., and achieve good structural stability, reduce shrinkage cavity and porosity, and excellent high-temperature mechanical properties.

Active Publication Date: 2020-09-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of plastic deformation at high temperature, dislocation slips tend to accumulate in large quantities when passing through coarse carbides. As the shear stress increases, stress concentration tends to occur near the carbides, thereby forming microcracks, and crack propagation eventually leads to alloy fracture. Coarse carbides greatly reduce the high temperature plasticity of the alloy
Moreover, Mn is easy to sublimate, it is not easy to add to the alloy during casting, and it is also harmful to the furnace, and the content in the final alloy is not easy to guarantee
In addition, coarse carbides also make machining the alloy more difficult

Method used

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  • Precipitation strengthening type high-temperature high-entropy alloy for in-situ precipitation of carbide and preparation method thereof
  • Precipitation strengthening type high-temperature high-entropy alloy for in-situ precipitation of carbide and preparation method thereof
  • Precipitation strengthening type high-temperature high-entropy alloy for in-situ precipitation of carbide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The in-situ carbide precipitation strengthening high-temperature high-entropy alloy in this embodiment includes: Cr: 24.75%, Fe: 24.75%, Co: 24.75%, Ni: 24.75%, Nb: 0.5%, C: 0.5%.

[0039] The preparation method of the high-temperature high-entropy alloy of the present embodiment comprises the following steps:

[0040] 1) Raw material preparation: the ingredients are calculated by atomic percentage, including: Cr: 24.75%, Fe: 24.75%, Co: 24.75%, Ni: 24.75%, Nb: 0.5%, C: 0.5%. Raw materials include: Cr, Fe, Co, Ni, Nb pure metals (purity>99.9wt.%) and Cr 3 C 2 (purity>99%).

[0041] 2) Melting step: Melting in an electric arc furnace. Put the above raw materials into the crucible of the furnace, and evacuate the furnace to ~5×10 -2 Pa, then backfill with argon, repeat twice, fill with argon to ~5×10 4 Pa. The melted button ingots are remelted five times, and then drop-cast using copper molds.

Embodiment 2

[0043] The in-situ carbide precipitation strengthening high-temperature high-entropy alloy in this embodiment includes: Cr: 24.75%, Fe: 24.75%, Co: 24.75%, Ni: 24.75%, Nb: 0.5%, C: 0.5%.

[0044] The preparation method of the high-temperature high-entropy alloy of the present embodiment comprises the following steps:

[0045] 1) Raw material preparation: the ingredients are calculated by atomic percentage, including: Cr: 24.75%, Fe: 24.75%, Co: 24.75%, Ni: 24.75%, Nb: 0.5%, C: 0.5%. Raw materials include: Cr, Fe, Co, Ni, Nb pure metals (purity>99.9wt.%) and Cr 3 C 2 (purity>99%).

[0046] 2) Melting step: Melting in an electric arc furnace. Put the above raw materials into the crucible of the furnace, and evacuate the furnace to ~5×10 -2 Pa, then backfill with argon, repeat twice, fill with argon to ~5×10 4 Pa. The melted button ingots are remelted five times, and then drop-cast using copper molds.

[0047] 3) Solid solution treatment: Clean the drop-cast sample with a...

Embodiment 3

[0050] The in-situ carbide precipitation strengthening high-temperature high-entropy alloy in this embodiment includes: Cr: 24.75%, Fe: 24.75%, Co: 24.75%, Ni: 24.75%, Nb: 0.5%, C: 0.5%.

[0051] The preparation method of the high-temperature high-entropy alloy of the present embodiment comprises the following steps:

[0052] 1) Raw material preparation: the ingredients are calculated by atomic percentage, including: Cr: 24.75%, Fe: 24.75%, Co: 24.75%, Ni: 24.75%, Nb: 0.5%, C: 0.5%. Raw materials include: Cr, Fe, Co, Ni, Nb pure metals (purity>99.9wt.%) and Cr 3 C 2 (purity>99%).

[0053] 2) Melting step: Melting in an electric arc furnace. Put the above raw materials into the crucible of the furnace, and evacuate the furnace to ~5×10 -2 Pa, then backfill with argon, repeat twice, fill with argon to ~5×10 4 Pa. The melted button ingots are remelted five times, and then drop-cast using copper molds.

[0054] 3) Solid solution treatment: Clean the drop-cast sample with a...

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Abstract

The invention discloses a precipitation strengthening type high-temperature high-entropy alloy for in-situ precipitation of carbide and a preparation method thereof, and belongs to the field of high-entropy alloy preparation. According to the method, a raw material composed of Cr, Fe, Co, Ni, Nb and Cr3C2 is fully smelted and mixed in an inert atmosphere and then subjected to solid solution agingtreatment, and the atomic percent and the atomic number of all the elements meet the requirements of 24.5% to 24.75% of Cr, 24.5% to 24.75% of Fe, 24.5% to 24.75% of Co, 24.5% to 24.75% of Ni, 0.5% to1% of Nb and 0.5% to 1% of C, wherein the atomic numbers of Cr, Fe, Co and Ni satisfy Cr = Fe = Co = Ni, and the atomic numbers of Nb and C satisfy Nb = C. According to the prepared alloy, a large number of spherical NbC carbide particles are dispersedly distributed in crystal grains, and a small number of M23C6 carbides are distributed on a crystal boundary. The crystal grains and carbide precipitated phases of the alloy have high thermal stability at high temperature, and have good effects on high-temperature structure stability and high-temperature mechanical properties of the alloy.

Description

technical field [0001] The invention belongs to the field of high-entropy alloy preparation, and relates to a precipitation-strengthened high-temperature high-entropy alloy with in-situ precipitation of carbides and a preparation method thereof, more specifically, to an in-situ precipitation with strong thermal stability and small size Carbide precipitation strengthens the new high-temperature high-entropy alloy, which is especially suitable for metal structural parts that have been used for a long time under high-temperature conditions, such as aerospace engine blades, water-cooled structures in industrial furnaces, steam turbines, industrial gas turbines, etc. Background technique [0002] With the rapid development of aerospace, automobile, energy and other industries, the operating temperature of some parts is getting higher and higher, which puts forward higher requirements for its high temperature performance. When high-temperature high-entropy alloys are used in high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C30/00C22C32/00C22F1/02
CPCC22C1/05C22C30/00C22C32/0052C22F1/02
Inventor 刘鑫旺高妞卢大海蒋文明樊自田
Owner HUAZHONG UNIV OF SCI & TECH
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