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...
| Authors: | , , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2019 |
| Country: | México |
| Institution: | Centro de Investigación y Asistencia en Tecnología |
| Repository: | Repositorio Institucional de CIATEQ |
| Language: | English |
| OAI Identifier: | oai:ciateq.repositorioinstitucional.mx:1020/509 |
| Online Access: | http://ciateq.repositorioinstitucional.mx/jspui/handle/1020/509 |
| Access Level: | Open access |
| Keyword: | info:eu-repo/classification/Palabra clave del autor/WC-10Co-4Cr info:eu-repo/classification/Palabra clave del autor/Laser cladding info:eu-repo/classification/Palabra clave del autor/Average energy per unit area info:eu-repo/classification/Palabra clave del autor/Grain growth info:eu-repo/classification/cti/7 info:eu-repo/classification/cti/33 info:eu-repo/classification/cti/3315 info:eu-repo/classification/cti/331599 |
| 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. |
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