Abstract
Four silicon and molybdenum (SiMo) ductile cast irons (DCI) alloys were produced with the intention of evaluating the possibility of substituting molybdenum (Mo) by niobium (Nb) for cost reduction purposes. These alloys were evaluated in terms of their chemical composition, microstructure, hardness and tensile properties at room and high temperatures (800 °C). Results show that substitution of Mo by Nb does not change the mechanical properties of the DCI alloys significantly either at room or high temperatures.
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