Effect of CeO2 on the microstructure and microhardensss of laser-cladded Ni60 on 35CrMoV alloys

Zhongtang Gao; Haibo Ren; Yu Yuan; Zhiming Gao; Eryong Liu; Chuanwei Zhang

doi:10.1016/j.micron.2021.103146

Effect of CeO₂ on the microstructure and microhardensss of laser-cladded Ni60 on 35CrMoV alloys

Micron. 2021 Nov:150:103146. doi: 10.1016/j.micron.2021.103146. Epub 2021 Sep 14.

Authors

Zhongtang Gao¹, Haibo Ren², Yu Yuan³, Zhiming Gao⁴, Eryong Liu⁵, Chuanwei Zhang⁶

Affiliations

¹ School of Mechanical Engineering, Xi,an University of Science and Technology, Xi,an, 710054, China. Electronic address: zhongtanggao@xust.edu.cn.
² School of Mechanical Engineering, Xi,an University of Science and Technology, Xi,an, 710054, China. Electronic address: haiboren@126.com.
³ State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China. Electronic address: yuyuan@licp.cas.cn.
⁴ School of Mechanical Engineering, Xi,an University of Science and Technology, Xi,an, 710054, China. Electronic address: gaozm@xust.edu.cn.
⁵ School of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, China. Electronic address: liueryong@xust.edu.cn.
⁶ School of Mechanical Engineering, Xi,an University of Science and Technology, Xi,an, 710054, China. Electronic address: zhanggwei@xust.edu.cn.

PMID: 34547637
DOI: 10.1016/j.micron.2021.103146

Abstract

In present work, the effect of CeO₂ addition on the crack susceptibility, microstructure, phase composition, solute segregation and microhardness of Ni60 cladding layer was investigated. The coatings were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and microscopic vickers hardness tester. The results show that main phase composition of Ni60 cladding layer are Ni₃Fe, Ni₃V, Ni₃B, Cr₂₃C₆, Fe₅C₂. The microhardness of the cladding layers from the surface to the substrate is gradually decreased with increasing depth of the cladding layer. With increasing addition of CeO₂, the diffraction peak of XRD is shifted to the left, indicating the lattice distortion in the phases of the coating. Compared with other cladding layers with different contents of CeO₂, the solute distribution of Ni60 cladding layer containing 4.0 % CeO₂ is more uniform, and the cross-section structure is more compact and homogeneous. The results show that the addition of 4.0 % CeO₂ can effectively inhibit the cracks and porosity, promote grain refinement, and improve the microstructure homogeneity in the Ni60 cladding layer.

Keywords: Element segregation; Laser cladding; Microhardenss; Microstructure; Ni60 alloy.