Microstructural Transformation and Tribological Properties of Laser-Cladded FeNiCoCrTi0.5-xNbC High-Entropy Alloy-Based Composite Coatings

被引:0
作者
Ying Zhang
Meng Xiao
Yi-min Zhou
Yi-fu Shen
机构
[1] Nanjing University of Aeronautics and Astronautics (NUAA),College of Materials Science and Technology
[2] Nanjing Institute of Advanced Laser Technology,undefined
[3] Huitu Technology Co.,undefined
[4] Ltd.,undefined
来源
Journal of Thermal Spray Technology | 2022年 / 31卷
关键词
hardening effect; high-entropy alloy-based composite coating; laser cladding; microstructure; wear and tribology;
D O I
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中图分类号
学科分类号
摘要
Laser-cladded FeNiCoCrTi0.5-xNbC (x = 3 wt.%, 6 wt.%, 12 wt.%, and 24 wt.%) high-entropy alloy-based composite coatings (HACCs; donated as C1, C2, C3, and C4, respectively) without pores, cracks, and spherical adhesion are successfully prepared and metallurgically deposited on 45 steel. It is found that the as-prepared composite coatings are mainly composed of body-centered cubic (BCC) solid solution and carbides. The increase of the NbC content in FeNiCoCrTi0.5-xNbC promotes the transformation of carbides from TiC to NbC, which causes carbides morphology to change from near spherical to polygonal and the carbides size to undergo a process of first decreasing and then significantly increasing. With the increase of the NbC content, the microhardness and wear resistance of FeNiCoCrTi0.5-xNbC first increase and then decrease. An appropriate amount of NbC can help FeNiCoCrTi0.5-xNbC HACCs resist friction and effectively protect the substrate. However, excessive NbC increases the local brittleness of FeNiCoCrTi0.5-xNbC and deteriorates the wear resistance.
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页码:1232 / 1243
页数:11
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