Evaluation of Johnson-Cook material model parameters for Si-Mo-Cr ductile cast iron

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Johnson-Cook (J-C) material model parameters are very important for the design engineers to analyze the combined effect of the amount of deformation, strain rate and temperature on the plastic behavior of the material under different working conditions both in experiments and simulations. Si-Mo-Cr ductile iron is a potential candidate material to effectively and efficiently replace the high strength alloy steels as it possesses good tensile and fracture strength and wear resistance properties required by the components operating at high temperatures. In the present work, Si-Mo-Cr ductile cast iron is prepared to contain a definite amount of silicon (Si), molybdenum (Mo), and chromium (Cr) by using conventional magnesium treatment in a ladle. The uniaxial tensile tests are conducted from the specimens taken out from the as-cast sample bars at different strain rates and temperatures. The various parameters of the Johnson-Cook material model are determined. Microstructural examination depicts that the percentage of various alloying elements affects the variation in the matrix of the ratio of pearlite and ferrite, nodularity, nodule size and nodule count and thereby affecting the tensile properties and Johnson-Cook parameters of the material.