Exam Question
(a) Discuss three metallurgical/processing techniques that are employed to enhance the creep resistance of metal alloys. (8)
(b) Define creep and specify the conditions under which it occurs? (8)
Class 2 (2nd Engineer)
MEKG
📅 Feb 2024
Reference Answer
### (a) Metallurgical/Processing Techniques to Enhance Creep Resistance
Creep resistance is a critical property for components operating under high stress at elevated temperatures. The primary goal of metallurgical techniques is to inhibit dislocation movement and grain boundary sliding, which are the main mechanisms of creep deformation. Three principal techniques are employed:
**1. Solid Solution Strengthening:**
* **Principle:** This technique involves introducing solute atoms into the solvent metal's crystal lattice to form a solid solution. The solute atoms, being of a different size than the solvent atoms, create localized strain fields within the lattice.
Creep resistance is a critical property for components operating under high stress at elevated temperatures. The primary goal of metallurgical techniques is to inhibit dislocation movement and grain boundary sliding, which are the main mechanisms of creep deformation. Three principal techniques are employed:
**1. Solid Solution Strengthening:**
* **Principle:** This technique involves introducing solute atoms into the solvent metal's crystal lattice to form a solid solution. The solute atoms, being of a different size than the solvent atoms, create localized strain fields within the lattice.
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