Question

1600 1538°C 1493°C 1400 1394°C 1200 1147°C 2.14 4.30 y, Austenite 1000 912°C y+Fe3C 800 a 727°C 0.76 0.022 a, Ferrite 600 a Fe3C Cementite (Fe3C) 400 0 (Fe) 2 3 4 6.7 Composition (wt% C) The above shows the iron-carbon phase diagram in weight % in the 0-67% carbon region. With the exception of 1a, please use weight% to answer all other parts of question 1 La (0.5 pt) What is the composition at the eutectic point? Please answer this in both weight% and atomic%. (Hint: to convert from weight percent to atomic percent, assume that there are 100 grams of the alloy to begin with. Then use weight % to find how many gram of each element is in the alloy. For example, if an element makes up 10 wt% of a 100g alloy, then the weight of that element in the alloy is 10g. Divide the weight of the element by the atom weight (g/mole) to find out how many moles of that element are in the alloy. Finally, find the total number of moles of all elements in the alloy, and find the molar (atom) fraction of the each element.)

When the steel containing 3.0wt% carbon is quenched very quickly (over 5000°C /s) from 1000 °C to room temperature, what are the phases present at room temperature after quenching?  Please explain why in detail.   

Answer 1

RESULT Steel Austenit concentrattern Cy. 坵q8C2 at 200 a at 120o a A5 46 0.92 89.9个 2-81 % F 97 C.3 63.60 0-57

a) comPOSITION AT THE EUTECTie PoiNT. 1200 C. 2-14 4-3 0.76 0.9 , เ.32 3 3 4 6 6.67 At the euectic Point, t the eutedtie Compositton →千3% Carlson in wt %)