Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 81, Issue -, Pages 63-70Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2019.02.024
Keywords
Stellite-6/WC coatings; Laser cladding; Co-coated WC powder; Wear resistance; Thermal fatigue
Funding
- Jiangsu Science and Technology Program [BE2014138]
- Fundamental Research Funds for the Central Universities [30917014106]
- PAPD
- Jiangsu Key Lab of Micro-Nano Materials and Technology
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The Stellite-6/WC composite coatings were produced on AISI H13 hot work tool steel by laser cladding with mixture of Co-coated WC (WC-12Co) particles and Stellite-6 powder. The phase composition, microstructural characterization, high temperature wear resistance and thermal fatigue behavior of Stellite-6/WC coatings were investigated and compared with the properties of the coatings produced from mixture of WC particles and Stellite-6 powder. The results showed that using the WC-12Co particles alleviated the decomposition of WC and resulted in the weaker intensity of W2C, CoCx and Co6W6C peaks in the X-Ray Diffraction (XRD) patterns. Compared with using the WC particles directly as the coating material, using the WC-12Co particles could further improve the wear resistance of coatings according to the relative lower width and depth of wear scars at the same WC content. In addition, fewer fatigue cracks were observed on the surface of coatings made by adding WC-12Co particles under the same thermal fatigue conditions, which indicates that using WC-12Co is beneficial to extend the life of Stellite-6/WC coatings.
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