Abstract
WC-reinforced Ni60 composite coatings with different types of WC particles were prepared on 304 stainless steel surface by laser cladding. The influences of spherical WC, shaped WC, and flocculent WC on the microstructures and properties of composite coatings were investigated. The results showed that three types of WC particles distribute differently in the cladding coatings, with spherical WC particles stacking at the bottom, shaped WC aggregating at middle and lower parts, with flocculent WC particles dispersing homogeneously. The hardnesses, wear resistances, corrosion resistances, and thermal shock resistances of the coatings are significantly improved compared with the stainless steel substrate, regardless of the type of WC that is added, and especially with regard to the microhardness of the cladding coating; the addition of spherical or shaped WC particles can be up to 2000 HV0.05 in some areas. Flocculent WC, shaped WC, and spherical WC demonstrate large to small improvements in that order. From the results mentioned above, the addition of flocculent WC can produce a cladding coating with a uniform distribution of WC that is of higher quality compared with those from spherical WC and shaped WC.
Highlights
Laser cladding, an advanced form of surface modification technology, has been widely used in various fields over recent years
Compared with external auxiliary methods, the influences of different WC particles on the microstructures and properties of the cladding coating are revealed by changing the types of WC particles, so as to obtain a high-quality cladding coating with a uniform WC distribution, which is more applicable for industrial use
It was seen that the overall shapes of the cladding coatings are regular, the interfaces of the cladding coating near the 304 substrate are relatively flat with no cracks, a small number of pores can observed through the cladding coating, and the morphologies and distributions of different types of WC are significantly different
Summary
An advanced form of surface modification technology, has been widely used in various fields over recent years. Compared with external auxiliary methods, the influences of different WC particles on the microstructures and properties of the cladding coating are revealed by changing the types of WC particles, so as to obtain a high-quality cladding coating with a uniform WC distribution, which is more applicable for industrial use. Scholars at home and abroad have conducted much in-depth research on the influencing mechanisms of the microstructures and properties of the cladding coating that result from the addition of specific types of WC particles [18,19,20], but the influencing mechanisms of different types of WC particles on the microstructures and properties of cladding coatings have been rarely reported For this reason, Ni/WC composite coatings were produced on the surface of a 304 stainless steel substrate by laser cladding technology in this paper. The influences of WC particle types on the microstructure and performance of the cladding coating would be studied, to explore the formation mechanism of a high quality cladding coating with a uniform WC distribution
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