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Method for regulating and controlling corrosion resistance of CoNiFe medium-entropy alloy

An entropy alloy and corrosion-resistant technology, which is applied in the field of regulating and controlling the corrosion resistance of CoNiFe meso-entropy alloys, can solve the problems of performance discount and corrosion performance decline, and achieve the effect of improving corrosion resistance, reliable method and high degree of controllability

Active Publication Date: 2020-05-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previous studies have also found that FeCoNi medium entropy alloys have good cold and hot workability, and have broad application prospects. After plastic processing, due to the internal stress caused by deformation, its corrosion performance is significantly lower than that of the cast state, thus greatly reduce its performance

Method used

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  • Method for regulating and controlling corrosion resistance of CoNiFe medium-entropy alloy
  • Method for regulating and controlling corrosion resistance of CoNiFe medium-entropy alloy
  • Method for regulating and controlling corrosion resistance of CoNiFe medium-entropy alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]The method includes five steps of vacuum melting, homogeneous treatment, hot forging, controlled rolling, and controlled annealing; the proportion of low ΣCSL (3≤Σ≤29) grain boundaries of the prepared CoNiFe mid-entropy alloy is 48%, and Σ3 The proportion of grain boundaries was 79%.

[0034] The medium entropy alloy prepared by this method has strong corrosion resistance

[0035] The specific method steps are as follows:

[0036] (1) Vacuum smelting: put 33.3% cobalt, 33.3% iron, and 33.4% nickel (purity greater than 99.99%) granular / block raw materials into a vacuum smelting furnace, and vacuumize to 5×10 -3 Pa, smelting current: 300A, then filled with argon until the furnace pressure: 0.5Pa, turned over and repeated smelting 3 times, then introduced magnetic stirring and smelting 2 times, and finally cooled with the furnace to form an ingot;

[0037] (2) Homogenization treatment: the ingot is placed in a muffle furnace, vacuumed, filled with argon, and kept at 100°C...

Embodiment 2

[0042] The method includes five steps of vacuum melting, homogeneous treatment, hot forging, controlled rolling, and controlled annealing; the proportion of low ΣCSL (3≤Σ≤29) grain boundaries of the prepared CoNiFe mid-entropy alloy is 51%, and Σ3 The proportion of grain boundaries was 83%. The medium entropy alloy prepared by this method has strong corrosion resistance.

[0043] The specific method steps are as follows:

[0044] (1) Vacuum smelting: put 33.3% cobalt, 33.3% iron, and 33.4% nickel (purity greater than 99.99%) granular / block raw materials into a vacuum smelting furnace, and vacuumize to 5×10 -3 Pa, smelting current: 300A, then filled with argon until the furnace pressure: 0.5Pa, turned over and repeated smelting 3 times, then introduced magnetic stirring and smelting 2 times, and finally cooled with the furnace to form an ingot;

[0045] (2) Homogenization treatment: the ingot is placed in a muffle furnace, vacuumed, filled with argon, and kept at 100°C for 12...

Embodiment 3

[0050] The method includes five steps of vacuum smelting, homogeneous treatment, hot forging, controlled rolling, and controlled annealing; the proportion of low ΣCSL (3≤Σ≤29) grain boundaries of the prepared CoNiFe mid-entropy alloy is 60%, and Σ3 The proportion of grain boundaries was 90%. The medium entropy alloy prepared by this method has strong corrosion resistance.

[0051] The specific method steps are as follows:

[0052] (1) Vacuum smelting: put 33.3% cobalt, 33.3% iron, and 33.4% nickel (purity greater than 99.99%) granular / block raw materials into a vacuum smelting furnace, and vacuumize to 5×10 -3 Pa, smelting current: 300A, then filled with argon until the furnace pressure: 0.5Pa, turned over and repeated smelting 3 times, then introduced magnetic stirring and smelting 2 times, and finally cooled with the furnace to form an ingot;

[0053] (2) Homogenization treatment: the ingot is placed in a muffle furnace, vacuumed, filled with argon, and kept at 100°C for 1...

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Abstract

The invention discloses a method for regulating and controlling the corrosion resistance of a CoNiFe medium-entropy alloy. The improvement of the proportion of low [sigma]CSL grain boundaries and theinterruption of the connectivity of a high-energy random grain boundary network are realized by regulating and controlling the proportion of special grain boundaries (especially [sigma]3 grain boundaries) in the medium-entropy alloy through grain boundary engineering, and therefore the corrosion resistance of the CoNiFe medium-entropy alloy can be regulated and controlled. The method comprises five steps of vacuum melting, homogenizing treatment, hot forging, controlled rolling and controlled annealing. According to the prepared CoNiFe medium-entropy alloy, the proportion of low [sigma]CSL grain boundaries is more than 40%, and the proportion of [sigma]3 grain boundaries is more than 80%. Through the regulation and control effect of the method, the corrosion performance of the CoNiFe medium-entropy alloy is remarkably improved, the corrosion potential is -0.55 to -0.11 V, and the corrosion current density is 23-0.03 [mu]A / cm2.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a method for regulating and controlling the corrosion resistance of CoNiFe mestropic alloys. Background technique [0002] The microstructure determines the performance of the material. Most of the common metal materials in the industry are crystal materials. As an important part of polycrystalline materials, the grain boundary has an important impact on the performance of the material, especially the corrosion performance. The corrosion phenomenon is basically Existing in all industrial fields, it is a well-known fact that corrosion causes huge economic losses. According to statistics, the direct economic losses caused by metal corrosion in the world are about 700-1000 billion U.S. dollars every year, of which the annual corrosion loss rate of the United States accounts for 4.2% of GDP , while the economic loss caused by corrosion accounts for 3.3% of GDP i...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22F1/10B21J5/00B21B37/00B21B37/58B21B37/74
CPCB21B37/00B21B37/58B21B37/74B21J5/002C22C1/02C22C19/07C22C30/00C22F1/002C22F1/10
Inventor 储成林安旭龙
Owner SOUTHEAST UNIV
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