Exam Question
Explain EACH of the following metallurgical processes:
(a) Induction hardening
(5)
(b) Nitriding
(6)
(c) Case hardening
(5)
Class 4 (4th Engineer)
MEKG
📅 Feb 2026
Reference Answer
### (a) Induction Hardening (5 Marks)
Induction hardening is a surface heat treatment process used to increase the hardness, wear resistance, and fatigue life of steel components in specific, localized areas without affecting the properties of the component's core.
**1. Principle of Operation:**
* **Electromagnetic Induction:** The process utilizes the principles of electromagnetic induction and Joule heating. A high-frequency alternating current (AC) is passed through a custom-shaped copper coil (inductor).
Induction hardening is a surface heat treatment process used to increase the hardness, wear resistance, and fatigue life of steel components in specific, localized areas without affecting the properties of the component's core.
**1. Principle of Operation:**
* **Electromagnetic Induction:** The process utilizes the principles of electromagnetic induction and Joule heating. A high-frequency alternating current (AC) is passed through a custom-shaped copper coil (inductor).
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