Exam Question
Explain the following terms and give examples of where each condition might occur:
(a) Stress Corrosion cracking (6)
(b) Creep cracking (5)
(c) Corrosion fatigue (5)
Class 4 (4th Engineer)
MEKG
📅 Dec 2023
Reference Answer
### (a) Stress Corrosion Cracking (SCC)
Stress Corrosion Cracking (SCC) is a insidious and often catastrophic mode of material failure resulting from the synergistic action of a susceptible material, a specific corrosive environment, and sustained tensile stress (static or residual). It typically leads to the sudden brittle fracture of normally ductile metals without significant prior plastic deformation.
* **Mechanism:**
* **Initiation:** SCC usually begins at a surface defect, scratch, or stress concentration point where the corrosive environment can locally attack the passive film protecting the metal. This creates small pits or crevice corrosion sites.
Stress Corrosion Cracking (SCC) is a insidious and often catastrophic mode of material failure resulting from the synergistic action of a susceptible material, a specific corrosive environment, and sustained tensile stress (static or residual). It typically leads to the sudden brittle fracture of normally ductile metals without significant prior plastic deformation.
* **Mechanism:**
* **Initiation:** SCC usually begins at a surface defect, scratch, or stress concentration point where the corrosive environment can locally attack the passive film protecting the metal. This creates small pits or crevice corrosion sites.
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