Microstructure of laser-clad SiC-(Ni alloy) composite coating

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• 作者：Pei ; Y.T. ; Ouyang ; J.H. ; Lei ; T.C. ; Zhou ; Y.
• 关键词：Silicon ; Carbon ; Nickel ; Alloys ; Composites
• 刊名：Materials Science and Engineering: A
• 出版年：1995
• 出版时间：May, 1995
• 年：1995
• 卷：194
• 期：2
• 页码：219-224
• 全文大小：734 K

文摘

The laser cladding technique was used to produce Ni alloy coatings with different SiC particle (SiC_p) contents on steel 1045. The complete dissolution of SiC_p took place during laser melting and led to a microstructural evolution of the coatings associated with the SiC_p content. M₇X₃ or M₂₃X₆-type carboborides and Ni-base solid solution are found as the main microstructural constituents of the clad layers, and the volume fraction of the carboborides increases with increasing SiC_p content. When the SiC_p content reaches 30 vol. % , a silicide of Ni₃Si₂ phase and a few spherical graphite precipitates are observed, and the γ matrix shows a modulated structure. The addition of SiC_p can significantly enhance the microhardness and wear resistance of the coatings.