Abstract
The aim of this work was to investigate fracture and fatigue behaviour of TiC—Ni/Fe cermets under monotonic and cyclic loading. The fracture toughness KIc was determined by a conventional testing method (using single edge notched beam) and evaluated by an indentation technique (indentation fracture toughness (IFT)). Results from both experimental routines were analysed and compared with the reference hardmetal – WC-10 wt% Co. As the result, a novel sequence for estimation of the IFT for TiC- and WC-based cemented carbides is presented. The transverse rupture strengths RTZ and fatigue strengths σf at a given life (107 cycles) were obtained by the testing of unnotched and notched specimens with the three-point bending scheme. Considering that the fatigue lifetime of cemented carbides is given by the subcritical crack growth of pre-existing defects, a linear elastic fracture mechanics approach is attempted to assess fatigue life—fatigue crack growth relationships for the studied materials. The reliability of used fatigue mechanics approach is proved by the excellent agreement observed between estimated and experimentally determined values for fracture toughness and fatigue strength of the investigated materials.
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Schedule a callMore From: Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
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