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Carbon addition effects on microstructure and small-scale hardness for Ti(C,N)-FeNi cermets

AuthorsBesharatloo, H.; de Nicolás, M.; Wheeler, J.M.; Mateo, A.; Ferrari-Fernández, Begoña ; Gordo Odériz, Elena ; Llanes, L.; Roa, J.J.
High speed indentation
Mechanical mapping
Massive indentation
Statistical analysis
Issue Date2019
CitationInternational Journal of Refractory Metals and Hard Materials 85 (2019)
Abstract[EN] The current study investigates the influence of carbon addition on the microstructural and micromechanical properties of Ti(C,N)-FeNi cermets with different ceramic/metal phase ratios. Evaluation of small-scale hardness is conducted by using high speed nanoindentation in conjunction with statistical analysis. It allows to gather extremely large data sets (40,000 imprints per grade and condition); and thus, detailed hardness mapping at the microstructure length scale. Subsequent statistical analysis was done by considering three mechanically distinct phases: Ti(C,N) particles, the metallic binder, and one exhibiting the composite behaviour (i.e. imprints probing two-phase regions). In general, it is found that porosity amount is reduced as ceramic/metal phase ratio decreases and carbon is added. Carbon addition is also observed to rise small-scale hardness, but only for two of the defined phases: metallic binder and the composite one. Similar trends are observed regarding the influence of ceramic/metal phase ratio and carbon addition on the inverse hardness-fracture toughness correlation measured under high applied loads.
Publisher version (URL)http://dx.doi.org/10.1016/j.ijrmhm.2019.105064
Identifiersdoi: 10.1016/j.ijrmhm.2019.105064
issn: 0263-4368
Appears in Collections:(ICV) Artículos
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