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Home/Questions/Q 1690
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Mohamad Afzal Khan
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Mohamad Afzal KhanGold
Asked: May 31, 20202020-05-31T22:27:07+05:30 2020-05-31T22:27:07+05:30In: Physical Metallurgy & Heat treatment

What is the maximum solubility of carbon in iron? Justify your answer wrt Fe-Fe3C equilibrium diagram.

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50%Relation among steel, cast iron & pig iron ( 3 voters )
50%Limitation of Fe-Fe3C diagram ( 3 voters )
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What is the maximum solubility of carbon in iron? Justify your answer wrt Fe-Fe3C equilibrium diagram.
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    3 Answers

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    1. C Patel Metallurgy Platinum⭐ GATE Metallurgy Coaching
      2020-06-01T15:24:46+05:30Added an answer on June 1, 2020 at 3:24 pm

      Hello, Maximum solubility is can be understood by different phases of iron with temperature and corresponding maximum carbon content at that temperature. Like for alpha iron, at room temperature the max solubility of carbon is 0.002 wt% for alpha iron maximum is at 723 C and it is 0.02 wt% for gammaRead more

      Hello,

      Maximum solubility is can be understood by different phases of iron with temperature and corresponding maximum carbon content at that temperature.

      Like for alpha iron, at room temperature the max solubility of carbon is 0.002 wt%

      for alpha iron maximum is at 723 C and it is 0.02 wt%

      for gamma iron it is 2.1 wt% at 1147 C

      for delta iron it is 0.09 wt% at 1496 C

      Solubility varies as the temperature varies.

      Hope this helps.

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      • Mohamad Afzal Khan Gold
        2020-06-02T19:44:51+05:30Replied to answer on June 2, 2020 at 7:44 pm

        All the phases will be converted into Pealite +ferrite(hypo), 100%P(eutectoid), P+Fe3C(hype r), P+Fe3C+ Gr(cast iron) under slowcooling, The RT structure/phase will be Fe-Fe3C only. Therefore maximum solubility of carbon in iron comes from %C in Fe3C.

        All the phases will be converted into Pealite +ferrite(hypo), 100%P(eutectoid), P+Fe3C(hype
        r), P+Fe3C+ Gr(cast iron) under slowcooling, The RT structure/phase will be Fe-Fe3C only. Therefore maximum solubility of carbon in iron comes from %C in Fe3C.

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    2. Mohamad Afzal Khan Gold
      2020-06-01T21:03:18+05:30Added an answer on June 1, 2020 at 9:03 pm

      %C in Fe3C = (3×56+12)/12 = 6.67%(maximum solubility in Fe). Fe-Fe3C phase diagram(meta stable)has been drawn on this basis by dilatometry.

      %C in Fe3C = (3×56+12)/12 = 6.67%(maximum solubility in Fe). Fe-Fe3C phase diagram(meta stable)has been drawn on this basis by dilatometry.

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    3. Gaurav Kumar Gold B.TECH, NIT DURGAPUR
      2020-06-02T14:57:21+05:30Added an answer on June 2, 2020 at 2:57 pm

      Maximum upto 6.67 wt% c

      Maximum upto 6.67 wt% c

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