| WEI Min,WAN Qiang,LI Xiao-feng,ZHU Fang-tao,HUANG Yong-jun,YANG Bing.Effect of Cladding Current on Microstructure and Properties of FeCoCrNiMn High Entropy Alloy Coatings[J],48(6):138-143 |
| Effect of Cladding Current on Microstructure and Properties of FeCoCrNiMn High Entropy Alloy Coatings |
| Received:April 30, 2019 Revised:June 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.06.015 |
| KeyWord:plasma cladding FeCoCrNiMn high entropy alloy cladding current microstructure microhardness |
| Author | Institution |
| WEI Min |
1.School of Engineering, Huazhong Agricultural University, Wuhan , China |
| WAN Qiang |
1.School of Engineering, Huazhong Agricultural University, Wuhan , China |
| LI Xiao-feng |
1.School of Engineering, Huazhong Agricultural University, Wuhan , China |
| ZHU Fang-tao |
1.School of Engineering, Huazhong Agricultural University, Wuhan , China |
| HUANG Yong-jun |
1.School of Engineering, Huazhong Agricultural University, Wuhan , China |
| YANG Bing |
2.School of Power & Mechanical Engineering, Wuhan University, Wuhan , China |
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| Abstract: |
| The work aims to study the effect of plasma cladding current on the structure and properties of FeCoCrNiMn high-entropy alloy coatings. The FeCoCrNiMn high-entropy alloy coating with equimolar ratio was prepared on 65Mn steel substrate by plasma surfacing process. Firstly, the macroscopic effect of plasma cladding technology to prepare high-entropy alloy coating was determined by observing the macroscopic surface characteristics of the coating. Metallographic microscope (OM), electron microscopy (SEM) and X-ray diffraction (XRD) were used to observe the microstructure and analyze the composition and phase composition of the coating. Meanwhile the surface hardness of the alloy coating and the deep hardness of the layer from the substrate to the coating were measured by a Vickers hardness micrometer. The alloy coatings prepared were crack-free and had an average coating thickness of 2 mm. The ratio of coating elements was consistent with that of cladding power element. Except that some Fe element entered the coating from the substrate, the structure was still FCC solid solution phase and the morphology was dendritic crystal. Distinct columnar crystal zone and heat affected zone (HAZ) could be observed at the junction of the coating and the substrate. As the current increased, the dendrite structure became thicker. With the increase of current, the surface hardness of FeCoCrNiMn high-entropy alloy coating gradually decreased. The hardness was abrupt to reach the maximum value of 366.3HV at 190 A, and the minimum was 258.78HV at 170 A. The change of hardness along the depth of the layer was not obvious. With the heat affected zone from top to bottom, the hardness first increased and then decreased. Plasma cladding technology has obvious advantages in the preparation of high-entropy alloy coatings and has the potential to produce large-area surface coatings with thicknesses up to the millimeter. The change in current magnitude causes the FCC phase composition to change without changing the organization structure. As the current increases, the dendrite structure becomes thicker and the coating hardness decreases. |
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