hw 19 - Enji Paul Papazisi CEE 300/TAM 324 HW Assignment 19...

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Enji Paul Papazisi CEE 300/TAM 324 10/24/12 HW Assignment 19 A steel alloy contains 97.5 wt% Fe, 2.0 wt% Mo, and 0.5 wt% C. Assume that there are no changes in the positions of other phase boundaries with the addition of Mo. (a) What is the eutectoid temperature of this alloy? Solution Using the figure below relating the eutectoid temperature with the percent weight of the allow, we can see that the eutectoid for our steel alloy occurs at the temperature on the Mo (blue) line when wt% is 2. This means that the eutectoid temperature is about 850˚C. FINAL ANSWER: 850˚C (b) What is the eutectoid composition in terms of carbon content? Solution Just as the last figure was used to find the eutectoid temperature, this figure can be used to determine the eutectoid composition in terms of wt % carbon. By
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Unformatted text preview: looking at the Mo (blue) line when wt % Mo is 2, it is found that the eutectoid composi±on is about 0.22 wt %C. FINAL ANSWER: 0.22 wt % C (c) What is the proeutectoid phase? SoluTon Since the alloy contains 0.5 wt% C, which is less than the eutectoid point composiTon of 0.77 wt% C, the proeutectoid phase must be ferrite FINAL ANSWER: Ferrite DISCUSSION ±he Fgures used above allow us to view exactly what the eutectoid temperature and composiTon will be based on the wt% composiTon of the alloying element, in this case being Mo. ±he values found in parts a and b are approximaTons based on my interpretaTon of the Fgures since it all depends on what level I think the point lies on. Part c is determined based on the assumpTon that the steel will be in equilibrium....
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