Exam Question
(a) Define creep and specify the conditions under which it occurs?
(6)
(b) Discuss three metallurgical/processing techniques that are employed to enhance the creep resistance of metal alloys.
(10)
Class 2 (2nd Engineer)
MEKG
📅 Feb 2026
Reference Answer
### (a) Definition and Conditions of Creep
**(1) Definition of Creep**
Creep is the time-dependent, permanent plastic deformation of a material subjected to a constant stress (or load) at elevated temperatures. It is a slow and continuous process that occurs at stress levels significantly below the material's yield strength at that temperature. The deformation continues to increase over time, eventually leading to failure or rupture if the conditions are maintained.
The phenomenon is typically characterized by a **Creep Curve**, which plots strain against time at constant stress and temperature. This curve is divided into three distinct stages:
**(1) Definition of Creep**
Creep is the time-dependent, permanent plastic deformation of a material subjected to a constant stress (or load) at elevated temperatures. It is a slow and continuous process that occurs at stress levels significantly below the material's yield strength at that temperature. The deformation continues to increase over time, eventually leading to failure or rupture if the conditions are maintained.
The phenomenon is typically characterized by a **Creep Curve**, which plots strain against time at constant stress and temperature. This curve is divided into three distinct stages:
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