hw 18 - Enji Paul Papazisi CEE 300/324 HW Assignment 18...

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Enji Paul Papazisi CEE 300/324 10/22/12 HW Assignment 18 Consider the phase diagram of plain carbon steel below; the top is a complete diagram and the bottom is an expanded region around the eutectoid point. (a) Estimate the temperature needed to fully austenize any hypo eutectoid steel. Solution The hypo-eutectoid line of steel occurs when the percent carbon equals 0.77% so we need to look to the right of that. Since austenite is distinguished by γ, we need to look at what temperature does γ exist above 0.77% carbon. This value is at least 1333˚ F and less than about 2550˚ F prior to 2.11% carbon when the necessary temperature is 2066˚F. Therefore, the final answer is in between 1333˚F and 2550˚F. (b) Calculate the amounts (% by weight) of ferrite, cementite, pro eutectoid phase and pearlite for 10120 steel (1.2% carbon content) at just below the eutectoid temperature. Solution Using the tie lines drawn on the next page, we see that the concentrations are as follows: 1.2% > 0.76% so cementite is pro-eutectoid phase.
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