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THE STRUCTURE AND PROPERTIES OF COMPOSITE LASER CLAD COATINGS WITH Ni BASED MATRIX WITH WC PARTICLES

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Author(s): Zita Iždinská | Ahmed Nasher | Karol Iždinský

Journal: Materials Engineering
ISSN 1335-0803

Volume: 17;
Issue: 2;
Start page: 1;
Date: 2010;
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Keywords: NiCrBSi powder | W | Composite laser clad | Wear resistance.

ABSTRACT
In this work, the influence of the processing conditions on the microstructure and abrasive wear behavior of composite laser clad coatings with Ni based matrix reinforced with 50% WC particles is analyzed. Composite powder was applied in the form of coatings onto a mild steel substrate (Fe–0.17% C) by different laser powers and cladding speeds. The microstructure of the coatings was analyzed by scanning electron microscopy (SEM). Tribological properties of coatings were evaluated by pin-on-disc wear test. It appeared that the hardness of the matrix of composite coatings decreases with increasing cladding speed. However, wear resistance of composite coatings with decreasing hardness of Ni based matrix increases. Significantly enhanced wear resistance of WC composite coatings in comparison with Ni based coatings is attributed to the hard phase structures in composite coatings.
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