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Fe-Mn-Cr-Ni-series medium-entropy stainless steel and preparation method thereof

A fe-mn-cr-ni, stainless steel technology, applied in the field of Fe-Mn-Cr-Ni series entropy stainless steel and its preparation, can solve the problems of high economic cost and difficult industrialized production, achieve improved service life, excellent The effect of seawater corrosion resistance and excellent corrosion resistance

Inactive Publication Date: 2019-06-21
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although multi-component high-entropy steel has many excellent properties, because it uses a large amount of precious metal elements, its economic cost is very high compared with traditional steel materials, and it faces practical difficulties in realizing industrial production

Method used

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  • Fe-Mn-Cr-Ni-series medium-entropy stainless steel and preparation method thereof
  • Fe-Mn-Cr-Ni-series medium-entropy stainless steel and preparation method thereof
  • Fe-Mn-Cr-Ni-series medium-entropy stainless steel and preparation method thereof

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Embodiment 1

[0030] This embodiment is a Fe-Mn-Cr-Ni medium-entropy stainless steel composed of four elements: Fe, Mn, Cr, and Ni, and the atomic percentages of Fe, Mn, Cr, and Ni elements are 40%: 20%: 20%: 20%. The raw materials for preparation are pure Fe, pure Ni, pure Cr and FeMn binary alloy with an atomic ratio of 1:1.

[0031] A preparation method of Fe-Mn-Cr-Ni series medium entropy stainless steel, comprising the following steps:

[0032] Step 1. Pretreatment: use a grinder to polish the surface oxide scales with high-purity (≥99.99%) Fe, Ni and Cr and Fe-Mn binary alloys with an atomic ratio of 1:1, and then place them in the In a beaker with absolute ethanol, perform ultrasonic treatment for 10 minutes to remove impurities and dirt on the surface of the raw materials, and then place the above raw materials in a drying oven for drying;

[0033] Step 2. Weighing materials: Prepare according to the atomic percentages of Fe, Mn, Cr, and Ni elements in order of 40%: 20%: 20%: 20%,...

Embodiment 2

[0048] Embodiment 2: Cut the sample processed in Step 4 of Embodiment 1 into three standard tensile patterns by wire cutting, the length of the gauge section is about 10mm, and the width is 3mm. Then use 240#, 600#, 800#, 1000#, 1200#, 1500#, 2000# to carry out mechanical grinding respectively to ensure that the gauge length section is flat, the scratch direction is consistent and there are no macro defects. Static and low-temperature tensile experiments, the strain rate during the experiment was 1×10-3 / s, in order to ensure the accuracy and repeatability of the experimental results, at least 3 samples were tested for each material, and finally the data with similar results were selected to use Origin8. 0 software to draw tensile engineering stress-strain curves. From the tensile engineering stress-strain curve, it can be clearly seen that the yield strength of the sample after step 4 treatment has been significantly improved compared with the as-cast state, which is 3 times t...

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Abstract

The invention discloses a Fe-Mn-Cr-Ni-series medium-entropy stainless steel and a preparation method thereof. The chemical components of the medium-entropy stainless steel are Fe40Mn20Cr20Ni20, and the medium-entropy stainless steel is prepared from raw materials with different qualities of high-purity Fe, high-purity Ni, high-purity Cr and Fe-Mn binary steel with an atomic ratio of 1 to 1; a vacuum arc melting and a copper mold suction casting method are adopted for casting, and the technological process comprises the following steps of smelting, heat treatment, cold working and the like. According to the stainless steel and the method, the medium-entropy stainless steel is designed through parameter calculation, the structure of the medium-entropy stainless steel is a single-phase face-centered cubic crystal structure, the medium-entropy stainless steel not only has good room-temperature strength and plastic deformation capability, and has especially excellent mechanical property atlow temperature; in addition, compared with 304 stainless steel, the medium-stainless steel has more excellent corrosion resistance in a 3.5% sodium chloride solution, in the future, elements such ascarbon, silicon and aluminum can be added into the medium-stainless steel, the comprehensive performance of the material is further enhanced. Therefore, the medium-entropy stainless steel has a very wide application prospect in marine equipment and alpine regions as structural materials.

Description

technical field [0001] The invention relates to the composition, preparation and performance of a Fe-Mn-Cr-Ni series medium entropy stainless steel, belonging to the technical field of steel. Background technique [0002] For thousands of years, the development history of human beings has been closely linked with the development history of metal materials. Metal materials have always been one of the most important materials for human beings, and have great significance in national economy and social life. Under the background that the country vigorously advocates the sustainable development strategy, we are extremely eager to develop materials with high strength, high plasticity, high corrosion resistance and low cost, which can increase the service life of materials while meeting the needs of social production and life. , to save resources and protect the environment. The design principle of traditional steel is generally to choose one or two elements as the main element,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22F1/00C21D8/02C22C1/02C22C30/00C22C33/04
CPCY02P10/20
Inventor 乔珺威边斌斌石晓辉张敏杨慧君郭瑞鹏王重吴玉程
Owner TAIYUAN UNIV OF TECH
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