Class 2 (2nd Engineer) MEKG 📅 Aug 2024

Exam Question

(a) Describe the key phases and microstructures present in the iron-carbon equilibrium diagram and explain their significance in the heat treatment of steel. (8)

(b) How do the different regions of the iron-carbon diagram influence the mechanical properties of steel, such as hardness, toughness, and ductility? Provide examples of how specific compositions and heat treatments can achieve desired properties. (8)

Reference Answer

### **Part (a): Key Phases, Microstructures, and Significance in Heat Treatment (8 Marks)**
The Iron-Carbon (Fe-C) equilibrium diagram is a phase diagram that shows the relationship between temperature, carbon content, and the resulting phases or microstructures in iron-carbon alloys under slow cooling (equilibrium) conditions. It is fundamental to understanding the heat treatment of steel.
#### **1. Key Phases and Microstructures**
* **Phases (Homogeneous, distinct structures):**

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