Class 2 (2nd Engineer) MEKG 📅 Apr 2025

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):**

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play