Low-temperature, high-strength high-toughness high-entropy alloy and machining method thereof

A high-entropy alloy and high-toughness technology, applied in low-temperature, high-strength, high-toughness high-entropy alloys and their processing fields, can solve problems such as reducing plasticity and limiting the application of high-entropy alloys, and achieve improved low-temperature performance, reasonable strength and plasticity. , the effect of improving performance

Active Publication Date: 2021-03-19
XIAN FULAI ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of improving the room temperature strength of some high-entropy alloy systems by means of material strengthening in the prior art, which will significantly reduce its plasticity and greatly limit the application of high-entropy alloys, and provide a low-temperature high-strength high-toughness High-entropy alloys and their processing methods

Method used

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  • Low-temperature, high-strength high-toughness high-entropy alloy and machining method thereof
  • Low-temperature, high-strength high-toughness high-entropy alloy and machining method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] According to the nominal composition (Fe 40 mn 40 co 10 Cr 10 ) 99.3 C 0.6 Ti 1.5 The composition of the composition is batched, the total mass is about 200g, and it is smelted under the vacuum electric arc furnace for four times to obtain an as-cast alloy with a grain size of about 50μm; a single smelting of 200g ensures the uniformity and compactness of the composition and structure According to GB / T 13298-2015, GB / T 11352-2009 and GB / T 7233, samples were taken to test the uniformity and compactness. The results are: the chemical composition meets the design standards, and there is no shrinkage cavity.

[0051] The uniform and dense raw materials are tested, and the low-temperature tensile strength and plasticity of the as-cast alloy are tested. The tensile strength meets 500-2000MPa, the plasticity meets 10-100%, no subsequent treatment is required, the preparation is completed and can be used directly.

Embodiment 2

[0053] According to the nominal composition (Fe 40 mn 40 co 10 Cr 10 ) 99.2 C 0.6 Ti 1.7 The composition of the composition is batched, the total mass is about 200g, and it is smelted under the vacuum electric arc furnace for four times to obtain an as-cast alloy with a grain size of about 50μm; a single smelting of 200g ensures the uniformity and compactness of the composition and structure According to GB / T 13298-2015, GB / T 11352-2009 and GB / T 7233, samples were taken to test the uniformity and compactness. The results are: the chemical composition meets the design standards, and there is no shrinkage cavity.

[0054] The uniform and dense raw materials are tested, and the low-temperature tensile strength and plasticity of the as-cast alloy are tested. The tensile strength meets 500-2000MPa, the plasticity meets 10-100%, no subsequent treatment is required, the preparation is completed and can be used directly.

Embodiment 3

[0056] 1) According to the nominal composition (Fe 40 mn 40 co 10 Cr 10 ) 99.1 C 0.6 Ti 2 The composition of the composition is batched, the total mass is about 200g, and it is smelted under the vacuum electric arc furnace for four times to obtain an as-cast alloy with a grain size of about 50μm; a single smelting of 200g ensures the uniformity and compactness of the composition and structure According to GB / T 13298-2015, GB / T 11352-2009 and GB / T 7233, samples were taken to test the uniformity and compactness. The results are: the chemical composition meets the design standards, and there is no shrinkage cavity.

[0057] The uniform and dense raw materials are tested, and the low-temperature tensile strength and plasticity of the as-cast alloy are tested. The tensile strength meets 500-2000MPa, the plasticity meets 10-100%, no subsequent treatment is required, the preparation is completed and can be used directly.

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Abstract

The invention discloses a low-temperature, high-strength and high-toughness high-entropy alloy and machining method thereof. The molecular formula of a mother alloy of the high-entropy alloy is (Fe40Mn40Co10Cr10)100-x-yCxTiy, wherein, x is carbon content, and x is larger than 0.6 wt% and smaller than or equal to 0.8 wt%; y is titanium content, and y is greater than 1.4 wt% and less than or equal to 2.4 wt%; According to the percentage composition of element atoms, an alloy matrix Fe40Mn40Co10Cr10 of the high-entropy alloy comprises Fe of 35-45%; Mn of 35-45%; Co of 5-15%; and Cr of 5-15%. According to the low-temperature, high-strength high-toughness high-entropy alloy, a certain content of carbon element and titanium element are introduced into the Fe40Mn40Co10Cr10 alloy to form an interstitial solid solution with a matrix, so that on one hand, the stacking fault energy of a material can be effectively reduced, and twinning can be induced under a low-temperature condition, and on theother hand, the carbon element and the titanium element can provide additional strength increment for the matrix through solid solution and precipitation of carbide and titanium compounds, so that thelow-temperature performance of the material is effectively improved; and the titanium element is used as a good interstitial atom and the titanium compound is used as an effective precipitation strengthening phase, so that the performance of the material at low temperature can be greatly improved.

Description

【Technical field】 [0001] The invention belongs to the technical field and relates to a method, in particular to a low-temperature, high-strength, high-toughness high-entropy alloy and a processing method thereof. 【Background technique】 [0002] High-entropy alloys are a class of alloys based on new alloy design concepts proposed by Ye Junwei in 2004. These alloys generally contain five or more alloying elements (now there are also four elements), and the content of each element is equal. Above 5%, there is no obvious dominant element, and the structure is generally single-phase FCC or BCC, and sometimes a mixed structure appears. Due to its strong solid solution effect, high-entropy alloys have high strength, thermal stability, wear resistance and corrosion resistance, and have received extensive attention and research since they were proposed, and are considered as a potential structural material. [0003] However, some high-entropy alloy systems, such as Fe 40 mn 40 co ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22F1/00C22F1/02C22C1/02
CPCC22C30/00C22C22/00C22C38/30C22C38/38C22C38/28C22F1/16C22F1/02C21D1/26C21D1/773C21D8/005
Inventor 何建国张明宇王邃江峰何美荣
Owner XIAN FULAI ELECTRICAL ALLOY
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