外加磁场对等离子熔覆FeCoNiCr0.5B高熵合金涂层组织与性能的影响

doi:10.3901/JME.2022.13.251

机械工程学报 ›› 2022, Vol. 58 ›› Issue (13): 251-260.doi: 10.3901/JME.2022.13.251

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外加磁场对等离子熔覆FeCoNiCr_0.5B高熵合金涂层组织与性能的影响

李思念^1,2, 黄海鸿^1,2, 赵伦武^1,2, 刘志峰^1,2

1. 合肥工业大学机械工程学院合肥 230009;
2. 合肥工业大学机械工业绿色设计与制造重点实验室合肥 230009

收稿日期:2021-07-02 修回日期:2021-12-25 出版日期:2022-07-05 发布日期:2022-09-13
通讯作者: 黄海鸿(通信作者),男,1980年出生,博士,教授,博士研究生导师。主要研究方向为绿色制造、再制造与回收再资源化。E-mail:huanghaihong@hfut.edu.cn
作者简介:李思念,男,1998年出生。主要研究方向为增材制造与再制造。E-mail:lisinian1998@qq.com
基金资助:
国家自然科学基金资助项目（U20A20295，51722502）。

Influence of Applied Magnetic Field on the Microstructures and Properties of FeCoNiCr_0.5B High-entropy Alloy Coating Fabricated by Plasma Cladding

LI Sinian^1,2, HUANG Haihong^1,2, ZHAO Lunwu^1,2, LIU Zhifeng^1,2

1. School of Mechanical Engineering, Hefei University of Technology, Hefei 230009;
2. Key Laboratory of Green Design and Manufacturing of Mechanical Industry, Hefei University of Technology, Hefei 230009

Received:2021-07-02 Revised:2021-12-25 Online:2022-07-05 Published:2022-09-13

摘要/Abstract

摘要： 为改善FeCoNiCr系高熵合金熔覆层的力学性能，采用磁场辅助等离子熔覆技术，在20钢表面制备FeCoNiCr_0.5B高熵合金涂层。通过扫描电子显微镜、金相显微镜、X射线衍射仪等仪器分析外加磁场对高熵合金涂层微观组织和物相结构的影响，利用维氏硬度计、摩擦磨损试验机测试涂层的显微硬度分布及耐磨性。结果表明：FeCoNiCr_0.5B高熵合金涂层组织均由面心立方(FCC)相和M₃B相组成，外加磁场作用不会改变物相种类。在磁场辅助作用下，涂层平均晶粒尺寸由18.64 μm减小至15.93 μm，熔覆层力学性能得到明显改善。当磁场强度为45 mT时，涂层平均显微硬度达708.84 HV，相比无磁场辅助涂层平均硬度提升19.5%；同时，涂层的磨损质量达到最小，为无磁场辅助涂层失重的40.8%，平均摩擦系数由0.64减小至0.42，且涂层的主要磨损形式由黏着磨损转变为磨粒磨损。研究结果既进一步完善了外加磁场辅助等离子熔覆制备高熵合金涂层的相关理论，又为FeCoNiCr_0.5B高熵合金性能提升提供了可行方案。

关键词: 高熵合金, 等离子熔覆, 磁场, 显微组织, 力学性能

Abstract: To improve the mechanical properties of the FeCoNiCr series high-entropy alloy cladding layer, FeCoNiCr_0.5B high-entropy alloy coatings are prepared on the surface of 20 steel using magnetic field-assisted plasma cladding technology. The effects of the applied magnetic field on the microstructure and phase structure of the high-entropy alloy coating are analyzed by scanning electron microscopy(SEM), optical microscope(OM), X-ray diffraction(XRD), and the wear resistance and microhardness distribution of the coatings are tested by Vickers hardness tester and friction wear tester. The results show that the microstructure of FeCoNiCr_0.5B high-entropy alloy coating is composed of face-centered cubic(FCC)phase and M₃B phases, and the applied magnetic field does not change the physical phase type. The average grain size of the coating is reduced from 18.64 μm to 15.93 μm under the effect of magnetic field assistance, and the mechanical properties of the molten layer are significantly improved. When the magnetic field strength is 45 mT, the average microhardness of the coating reaches 708.84 HV, which is 19.5% higher than the average hardness of the coating without magnetic field assistance; meanwhile, the wear quality of the coating reaches the minimum, the minimum wear weight loss is only 6 mg, which is 40.8% of the weight loss of the coating without magnetic field assistance, the average friction coefficient is reduced from 0.64 to 0.42, and the main wear form of the coating is changed from adhesive wear to abrasive wear. The results are not only conducive to the improvement of the relevant theory of plasma cladding high-entropy alloys with external magnetic fields, but also provide a feasible solution for the improvement of the properties of FeCoNiCr_0.5B high-entropy alloys.

Key words: high entropy alloy, plasma cladding, magnetic field, microstructure, mechanical properties

中图分类号:

TH162

李思念, 黄海鸿, 赵伦武, 刘志峰. 外加磁场对等离子熔覆FeCoNiCr_0.5B高熵合金涂层组织与性能的影响[J]. 机械工程学报, 2022, 58(13): 251-260.

LI Sinian, HUANG Haihong, ZHAO Lunwu, LIU Zhifeng. Influence of Applied Magnetic Field on the Microstructures and Properties of FeCoNiCr_0.5B High-entropy Alloy Coating Fabricated by Plasma Cladding[J]. Journal of Mechanical Engineering, 2022, 58(13): 251-260.

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外加磁场对等离子熔覆FeCoNiCr_0.5B高熵合金涂层组织与性能的影响

Influence of Applied Magnetic Field on the Microstructures and Properties of FeCoNiCr_0.5B High-entropy Alloy Coating Fabricated by Plasma Cladding

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外加磁场对等离子熔覆FeCoNiCr0.5B高熵合金涂层组织与性能的影响

Influence of Applied Magnetic Field on the Microstructures and Properties of FeCoNiCr0.5B High-entropy Alloy Coating Fabricated by Plasma Cladding

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外加磁场对等离子熔覆FeCoNiCr_0.5B高熵合金涂层组织与性能的影响

Influence of Applied Magnetic Field on the Microstructures and Properties of FeCoNiCr_0.5B High-entropy Alloy Coating Fabricated by Plasma Cladding