Effect of the Average Energy on WC Grain Growth of WC-10Co-4Cr Composite by Laser Cladding

In the present study, the microstructure evolution of WC-10Co-4Cr powder deposited on AISI-SAE 1020 steel substrate by laser cladding was evaluated, considering the effect of average energy per unit area. Single tracks were obtained by employing a Yb: YAG laser system with selected processing parame...

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Bibliographic Details
Published in:Metals (Basel ) 2019-12, Vol.9 (12), p.1245
Main Authors: López-Baltazar, Enrique A., Ruiz-Luna, Haideé, Baltazar-Hernández, Víctor H., Ruiz-Mondragón, José Jorge, Ibarra-Medina, Juansethi, Alvarado-Orozco, Juan Manuel
Format: Article
Language:English
Subjects:
Alloys
average energy per unit area
Coalescing
Dilution
Energy
Gases
Grain growth
Laser beam cladding
laser cladding
Lasers
Low carbon steels
Microstructure
Morphology
Particle size
Process parameters
Raw materials
Semiconductor lasers
Substrates
Tungsten carbide
wc-10co-4cr
YAG lasers
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Summary:In the present study, the microstructure evolution of WC-10Co-4Cr powder deposited on AISI-SAE 1020 steel substrate by laser cladding was evaluated, considering the effect of average energy per unit area. Single tracks were obtained by employing a Yb: YAG laser system with selected processing parameters. All samples were sectioned in the transverse direction for further characterization of the cladding. Results showed that dilution lay within 15% and 25%, whereas porosity was measured below 12%. According to microstructural analyses, considerable grain growth is developed within the central area of the cladding (namely, the inner region); additionally, the development of a triangular and/or polygonal morphology for WC particles along with a clear reduction in hardness was observed when employing a high average energy. It is worth noting that, in spite of the rapid thermal cycles developed during laser cladding of WC-10Co-4Cr, grain growth is attributed to a coalescence mechanism due to complete merging of WC into larger particles. Finally, the presence of small round or ellipsoidal particles within the inner region of the cladding suggested that non-merged particles occurred due to both an inhomogeneous dispersion and the lack of faced-shaped WC particles.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9121245