Microstructure and properties of IN718/WC-12Co composite coating by laser cladding

To improve microhardness and tribological properties of IN718, WC-12Co particles were added to it by the laser cladding. This study investigated the effect of the content of WC-12Co on the microstructure, phase composition, microhardness, tribological properties and machinability of the composite co...

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Bibliographic Details
Published in:Ceramics international 2022-04, Vol.48 (7), p.9218-9228
Main Authors: Xu, Peihua, Zhu, Lida, Xue, Pengsheng, Yang, Zhichao, Wang, Shuhao, Ning, Jinsheng, Meng, Guiru, Lan, Qing, Qin, Shaoqing
Format: Article
Language:English
Subjects:
IN718/WC-12Co coating
Laser cladding
Machinability
Tribological properties
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Summary:To improve microhardness and tribological properties of IN718, WC-12Co particles were added to it by the laser cladding. This study investigated the effect of the content of WC-12Co on the microstructure, phase composition, microhardness, tribological properties and machinability of the composite coating. The results shows that WC-12Co can inhibit the growth of columnar grains and the (200) growth direction of γ-Ni, and refine the microstructure. The average microhardness of coating increases from 245.83HV0.5 to 462.63HV0.5 with the increase of WC-12Co content. The coating containing 30% wt. WC-12Co has the smallest wear loss, that is, the best wear resistance. However, the coating containing 20 wt% WC-12Co has the lowest COF (0.518), that is, the best antifriction capability. With the increase of WC-12Co content, the milling force increases and the instability of the cutting process is aggravated. Moreover, with the addition of WC-12Co, the wear mechanism changed from adhesive wear to abrasive wear and oxidation wear.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2021.12.108