engleski

INFLUENTIAL FACTORS ON THE TOUGHNESS OF NANOSTRUCTURED HARD METALS

The procedure of toughness determination on nanostructured hard metals is described in the paper. Toughness is determined with the use of Palmquist toughness test by measuring the total length of cracks emanating from the four corners of a Vickers hardness indentation using the load of 294 N according to ISO 28079:2009. The specimens of nanostructured hard metals were developed in the company Alfa tim d.o.o. varying the parameters related to technological process of obtaining such as sintering temperature and input variables such as carbide powder grain size, percentage of Co and grain growth inhibitors. The measurements on developed specimens were carried out in the Laboratory for Testing Mechanical Properties of Materials at the Faculty of Mechanical Engineering and Naval Architecture. The results of the carried measurements and influence of certain factors were analysed. Certain conclusions about influential factors on the achieved toughness of nanostructured hard metals have been brought.

fracture toughness; Palmquist test; nanostructured hard metals

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