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Experimental Study of Indentation Fracture Toughness in Nanostructured Cemented Carbides

In this paper the hardness and Vickers indentation fracture toughness values for nanostructured cemented carbides was tested and analyzed. The experimental part included the testing of three samples: WC with 5% cobalt (WC- 5Co), WC with 10% cobalt (WC-10Co) and WC with 15% cobalt (WC-15Co). Hardness was tested by Vickers method (HV30) according to HRN EN ISO 6507-1: 2005. Fracture toughness was determined and compaired by different indentation methods such as Palmqvist, Shetty, Niihara, Antis etc. These methods use the length of cracks that propagate from the tip of the Vickers pyramid imprint to determine fracture toughness. The results show that by increasing the amount of Cobalt in cemented carbides hardness values drop, and the fracture toughness increases. They also indicate a difference in results using various mathematical models. By sintering nanostructured cemented carbide, higher hardness values with a small decrease in fracture toughness can be achived.

Nanostructured cemented carbides, hardness, fracture toughness

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