The FeC phase diagram is shown Answer the following question

The Fe-C phase diagram is shown. Answer the following questions (1-4 below): What is the eutectic temperature (degree C) and composition (wt%C) In cementite, if the atomic weight of C is 12.0 g/mol and the atomic weight of Fe is 55.85 g/mole, calculate the atomic% or mol% C that corresponds to 6.70 wt% C. At about 725 degree C, an alloy was found to have both a proeutectoid phase and pearlite. Specify the two compositions where it is possible that there is 21.0 wt% proeutectoid phase while 79.0 wt% is pearlite. Recall that pearlite contains alternating layers of both eutectoid ferrite and eutectoid cementite (lamellar structure). If the original alloy was 1000 g total weight (containing both Fe and C), for one of the compositions you specified in part (3) - clearly indicate which composition you chose, calculate the grams of carbon individually in the following: a) the proeutectoid phase, b) the eutectoid alpha, and c) the eutectoid Fe_3C.

Solution

Answer for question number 1

the eutectic temperature (183 C) and the a-phase at this temperature has the ... at the tin rich end of the composition range,