The following data were obtained from a series of Charpy impact tests performed on four ductile cast irons, each having a different silicon content. Plot the data and determine
(a) The transition temperature of each (defined by the mean of the absorbed energies in the ductile and brittle regions); and
(b) The transition temperature of each (defined as the temperature that provides 10 J
of absorbed energy).
(c) Plot the transition temperature versus silicon content and discuss the effect of silicon on the toughness of the cast iron. What is the maximum silicon allowed in the cast iron if a part is to be used at 25ºC?

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Test Temperature 2.55% 2.85% 3.25% 3.63% Impact energy (J) -50 2.5 25 50 75 100 125 13 17 19 19 19 10 4 16 16 16 12 16 16 16 13 16 16