Laser-clad Inconel 625 coatings on Q245R structure steel: microstructure, wear and corrosion resistance

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作者
Wanyuan Gui
Cheng Zhong
Junyi Gu
Yuhang Ding
Xiaoming Wang
Tao Wu
Yongfeng Liang
Jingyan Qin
Yuhai Qu
Junpin Lin
机构
[1] University of Science and Technology Beijing,National Center for Materials Service Safety
[2] University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials
[3] University of Science and Technology Beijing,School of Mechanical Engineering
[4] Nanchang University,School of Materials Science and Engineering
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npj Materials Degradation | / 6卷
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摘要
In this work, ultra-low dilution rate Inconel 625 coatings with a thickness of ~534.4 μm were prepared by high-speed laser cladding technique on the Q245R steel. The XRD and TEM results show that the Inconel 625 coatings are mainly composed of the Nb and Mo-enriched laves phase with hexagonal close-packed (HCP) structure and the γ-Ni phase with face-centered-cubic (FCC) structure. The cellular crystal, column crystal, and equiaxed dendritic crystal were observed in the bottom, middle, and top of the Inconel 625 coatings from SEM results, respectively. The wear resistance and corrosion resistance of Q245R steel are significantly improved by high-speed laser cladding Inconel 625 coatings. In addition, the low dilution rate is beneficial for improving the wear and corrosion resistance of high-speed laser cladding Inconel 625 coatings. These findings may provide a method to design the wear and corrosion resistance of coatings on steel's surface.
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