1. The problem statement, all variables and given/known data Given that the overall weight percentage of ferrite along the grain boundaries of an as-cast steel with unknown C amount is 35.23%: a) Identify if it is hypoeutectoid or hypereutectoid. b) Identify the amount of carbon alloyed in the steel. c) Identify how much ferrite and cementite are in sample. d) Identify the amount of eutectoid ferrite. 2. Relevant equations 3. The attempt at a solution I know that eutectoid is at 0.76 wt% C. If the wt% C is less it is hypoeutectoid, otherwise it is hypereutectoid. The problem is, the wt% C is unknown and I think I need to find that first to be able to answer a. I'm given the weight percent of ferrite along the grain boundaries. I know there is a formula for computing the weight percentages using the lever rule, but you need to know the temperature in order to use the lever rule as far as our previous examples went, which is not given. I really don't know how to start. The whole lecture is very muddy to me conceptually. I don't think "as-cast" was mentioned in our lecture before, does this have any influence on the answer?