(a) a very large iron plate of thickness 100 mm is cast by pouring iron at its melting temperature into a sadn mould, such that heat is withdrawn from both faces of the solidifying plate. estimate by calculation the time for the plate to solidify if the initial mould temperature is 25 celcius.
(b) because in part (a) the iron is cast at its melting point, the liquid iron sometimes begins to solidify prior to filling the entire mould. to solve this problem, the iron is heated to 60 celsius above its melting temperature prior to pouring. calculate the new solidifcation time if the initial mould temperature is 25 celsuis.