EFFECT AND MECHANISM OF CeO2 ON THE MICROSTRUCTURE AND PROPERTIES OF Ni60A–Cr3C2 LASER CLADDING LAYER

Dongni Zhang, Hanguang Fu, Zhenguo Xing, Xuelong Ping and Jian Lin
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Dongni Zhang: School of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100124, P. R. China
Hanguang Fu: School of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100124, P. R. China
Zhenguo Xing: #x2020;Engineering Research Center of Hebei for Abrasion Resistant Metal Matrix Composite, Handan Huiqiao Composite Material Technology Co., Ltd., Handan, Hebei 056000, P. R. China
Xuelong Ping: School of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100124, P. R. China
Jian Lin: School of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100124, P. R. China

Surface Review and Letters (SRL), 2021, vol. 28, issue 04, 1-10

Abstract: Using laser cladding technology, a Ni60A alloy cladding layer added with rare earth oxides CeO2 and Cr3C2 was prepared on the surface of Cr12MoV die steel. Through scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS) analyses, the influence of CeO2 on the microstructure, hardness and wear resistance of Ni60A–Cr3C2 laser cladding layer was studied, and the mechanism of action of CeO2 was discussed. The results show that in the laser cladding Ni60A–Cr3C2 coating, after adding CeO2 powder, the cladding layer is well formed and the microstructure is significantly refined. As the addition of CeO2 increases, the microhardness of the cladding layer increases first and then decreases. When the addition amount of CeO2 is 2wt.%, the microhardness of the coating is the largest, which is 1107HV. As the content of CeO2 continues to increase, the hardness decreases. As the content of CeO2 in the cladding layer increases, the wear loss of the sample first decreases and then increases. When the mass fraction of CeO2 is 1wt.%, the wear loss of the cladding layer is the least and the wear resistance is the best. The wear morphology of the Ni60A+Cr3C2 cladding layer without adding CeO2 appears with a lot of abrasive debris, and the main mechanism is adhesive wear. When the addition amount of CeO2 is 1wt.%, the wear mainly appears as furrow, which denotes abrasive wear.

Keywords: Laser cladding; Ni-based alloys; rare earth oxides; microstructure; wear resistance (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218625X21500189

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