A hypoeutectoid steel contains 5.9 wt % eutectoid ferrite at temperature just be

Question

A hypoeutectoid steel contains 5.9 wt % eutectoid ferrite at temperature just
below 727°C. With the aid of the phase diagram below, determine the carbon
content of the steel in weight percent?

Q3 A h poeutectoid steel contains 5.9 wt % eutectoid ferrite at temperature just elow 727°C. With the aid of the phase diagram below, determine the carbon ontent of the steel in weight percent? (6 marks) Composition (at% C) 10 15 20 25 1600 1538°C 1493 C 1400S 2500 1394°C 1200 1147°C 2.14 4.30 y, Austenite 1000 912°C 800 1500 727°C 0.76 0.02 , Ferrite 600 ntite (Fe3C) 1000 2 5 6 6.70 (Fe) Composition (wt% C)

Explanation / Answer

Weight Fraction of Ferrite in Hype Eutectoid steels

W Ferrite(7270C) = C0 - C / Ceutectiod - C

0.059 = C0 -0.022 / 0.76-0.022

0.059*0.738 = C0 -0.022

C0 =0.043542+0.022 = 0.065542 Weigt percentage of Carbon

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