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Effect of Y 2 O 3 on microstructural characteristics and wear resistance of cobalt‐based composite coatings produced on TA15 titanium alloy surface by laser cladding
Author(s) -
Lu Donghua,
Liu Shasha,
Zhang Xiaoyu,
Zhang Weiping
Publication year - 2015
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5697
Subject(s) - materials science , microstructure , indentation hardness , coating , scanning electron microscope , metallurgy , titanium alloy , composite number , cladding (metalworking) , alloy , tribology , composite material , optical microscope
The effects of Y 2 O 3 on the microstructure, phase composition of the coatings, microhardness and wear resistance of cobalt‐based composite coatings prepared by laser cladding were investigated. The TA15 titanium alloy was selected as substrate which the cobalt‐based composite powder with different content of Y 2 O 3 was cladded on. The microstructure of the coatings was observed by scanning electron microscope (SEM) and metallurgical microscope. The phase structure of the coatings was determined by X‐ray diffraction (XRD), and the microhardness and wear resistance of the coatings were measured by hardness tester and wear testing machine. The results show that the rare earth oxide Y 2 O 3 can refine and purify the microstructure of the coatings, reduce the porosities and cracks and improve compactness of the coatings. Moreover the addition of Y 2 O 3 improves the microhardness of the coatings and reduces the friction coefficient, thus improving the wear property of the coatings. And the wear resistance of the coating with Y 2 O 3 has improved about 50 times; the highest value of microhardness in the coating is HV1181.1. And 0.8 wt% content of Y 2 O 3 in the coating is the best choice for improving the microhardness and wear resistance of the coating. It is feasible to improve the microstructure and tribological properties of laser cladding coatings by adding of Y 2 O 3 . Copyright © 2014 John Wiley & Sons, Ltd.