| Superior corrosion resistance-dependent laser energy density in(CoCrFeNi)95Nb5 high entropy alloy coating fabricated by laser cladding |
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| 作者姓名： | Wen-rui Wang Wu Qi Xiao-li Zhang Xiao Yang Lu Xie Dong-yue Li Yong-hua Xiang |
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| 作者单位： | School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;Key Laboratory of Fluid Interaction with Material, Ministry of Education, Beijing 100083, China;R&D management department, China nuclear power technology research institute Co., Ltd., Shenzhen 518031, China;Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;Unit 92228, People's Liberation Army, Beijing 100072, China |
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| 基金项目： | and the National Natural Science Foundation of China;This work was financially supported by the National Key R&D Program of China |
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| 摘 要： | (CoCrFeNi)95Nb5 high entropy alloy(HEA)coatings were successfully fabricated on a substrate of Q235 steel by laser cladding technology.These(CoCrFeNi)95Nb5 HEA coatings possess excellent properties,particularly corrosion resistance,which is clearly superior to that of some typical bulk HEA and common engineering alloys.In order to obtain appropriate laser cladding preparation process parameters,the effects of laser energy density on the microstructure,microhardness,and corrosion resistance of(CoCrFeNi)95Nb5 HEA coating were closely studied.Results showed that as the laser energy density increases,precipitation of the Laves phase in(CoCrFeNi)95Nb5 HEA coating gradually decreases,and diffusion of the Fe element in the substrate intensifies,affecting the integrity of the(CoCrFeNi)95Nb5 HEA.This decreases the microhardness of(CoCrFeNi)95Nb5 HEA coatings.Moreover,the relative content of Cr2O3,Cr(OH)3,and Nb2O5 in the surface passive film of the coating decreases with increasing energy density,causing corrosion resistance to decrease.This study demonstrates the controllability of a high-performance HEA coating using laser cladding technology,which has significance for the laser cladding preparation of other CoCrFeNi-system HEA coatings.
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| 关 键 词： | high entropy alloy coating laser cladding technology laser energy density corrosion resistance |
Superior corrosion resistance-dependent laser energy density in(CoCrFeNi)95Nb5 high entropy alloy coating fabricated by laser cladding |
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| Wen-rui Wang,Wu Qi,Xiao-li Zhang,Xiao Yang,Lu Xie,Dong-yue Li,Yong-hua Xiang.Superior corrosion resistance-dependent laser energy density in(CoCrFeNi)95Nb5 high entropy alloy coating fabricated by laser cladding[J].International Journal of Minerals,Metallurgy and Materials,2021,28(5):888-897. |
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| Authors: | Wen-rui Wang Wu Qi Xiao-li Zhang Xiao Yang Lu Xie Dong-yue Li Yong-hua Xiang |
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| Abstract: | (CoCrFeNi)95Nb5 high entropy alloy (HEA) coatings were successfully fabricated on a substrate of Q235 steel by laser cladding technology. These (CoCrFeNi)95Nb5 HEA coatings possess excellent properties, particularly corrosion resistance, which is clearly superior to that of some typical bulk HEA and common engineering alloys. In order to obtain appropriate laser cladding preparation process parameters, the effects of laser energy density on the microstructure, microhardness, and corrosion resistance of (CoCrFeNi)95Nb5 HEA coating were closely studied. Results showed that as the laser energy density increases, precipitation of the Laves phase in (CoCrFeNi)95Nb5 HEA coating gradually decreases, and diffusion of the Fe element in the substrate intensifies, affecting the integrity of the (CoCrFeNi)95Nb5 HEA. This de-creases the microhardness of (CoCrFeNi)95Nb5 HEA coatings. Moreover, the relative content of Cr2O3, Cr(OH)3, and Nb2O5 in the surface passive film of the coating decreases with increasing energy density, causing corrosion resistance to decrease. This study demonstrates the con-trollability of a high-performance HEA coating using laser cladding technology, which has significance for the laser cladding preparation of other CoCrFeNi-system HEA coatings. |
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| Keywords: | high entropy alloy coating laser cladding technology laser energy density corrosion resistance |
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