Correct Answer - Option 4 : 0.888 and 0.112 respectively
Concept:
- Pearlite is a Eutectoid mixture of Ferrite and Cementite
- Eutectoid reaction is formed at 727°C and 0.8 % of Carbon on cooling the Austenite
\(\nu \mathop \to \limits^{ - \Delta H} \alpha + \mathop {Fe}\nolimits_3 C\)
Here, \(\nu \) = Austenite, \(\alpha \) = Ferrite and \(\mathop {Fe}\nolimits_3 C\) = Cementite
- The mixture \(\mathop {\alpha + Fe}\nolimits_3 C\) is called the pearlite
- The mass percentage of \(\alpha \left( {Ferrite} \right) = 88\% \)
- The mass percentage of \(\mathop {Fe}\nolimits_3 C\left( {Cementite} \right) = 12\% \)