Class 2 (2nd Engineer) MEKG 📅 Apr 2025

Exam Question

(a) Explain the action of EACH of the following metallurgical mechanism: (10)

(i) Creep

(ii) Brinelling

(iii) Fretting

(iv) Fretting corrosion

(b) State, with reasons, where EACH of the mechanisms in occur in ship propulsion System. (6)

Reference Answer

### (a) Action of Metallurgical Mechanisms (10 Marks)
#### (i) Creep
Creep is the time-dependent, permanent (plastic) deformation of a material subjected to a constant stress at elevated temperatures, typically above 40% of its absolute melting point. The deformation occurs even if the applied stress is below the material's yield strength at that temperature.
**Action and Stages:**

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