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ABSTRACT
Three-dimensional WC–Co hardmetal samples were fabricated using WC–Co nanopowder via two methods: selective laser melting (SLM) and fused deposition modelling (FDM). The carbon loss and phase transition during processing were controlled to minimise the degradation of mechanical properties of the cemented carbide. The SLM samples were manufactured from granule powder produced via spray drying, whereas the FDM process was carried out on a filament produced via injection moulding. During SLM, carbon loss occurred due to the high energy involved in the process. Owing to carbon loss, the relative density and Rockwell hardness of SLM processed samples were low. To overcome this, a stable WC phase cemented carbide was manufactured via FDM. The density of the sintered FDM samples was improved by increasing the packing density of the filaments. The carbide sintered samples had a relative density of 96.3%, hardness of HRA 89.06 and carbon content of 5.47–5.52 wt-%.
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No potential conflict of interest was reported by the author(s).
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Notes on contributors
Seung Woo Lee
Seung Woo Lee is a MS student at Korea University.
Yeon Woo Kim
Yeon Woo Kim is a MS student at Pusan National University.
Kyeong Mi Jang
Kyeong Mi Jang is a researcher at Korea Institute of Materials Science.
Jin Woo Lee
Jin Woo Lee is a researcher at Korea Institute of Materials Science.
Min-Soo Park
Min-Soo Park is a senior researcher at Korea Institute of Materials Science.
Hye Young Koo
Hye Young Koo is a senior researcher at Korea Institute of Materials Science.
Gook-Hyun Ha
Gook-Hyun Ha is a principal researcher at Korea Institute of Materials Science.
Yun Chan Kang
Yun Chan Kang is a professor at Korea University.