Cavitation corrosion behavior of cast duplex stainless steel in seawater
- Kuwait Inst. for Scientific Research, Safat (Kuwait)
The cavitation corrosion behavior of a commercial cast duplex stainless steel was studied in seawater using an ultrasonically induced cavitation facility at a frequency of 20 kHz and an amplitude of 25 {micro}m. The work included measurements of the free corrosion potential and mass loss in addition to microscopic examinations. Cavitation caused an active shift in the free corrosion potential. The rate of mass loss was negligible in quiescent seawater, while it significantly increased in the presence of cavitation. The application of cathodic protection reduced the rate of mass loss by 19%. Microscopic examinations revealed that the first signs of cavitation damage were in the form of slip bands and small cavities in the austenite islands and at the ferrite/austenite boundaries. With the progress of cavitation, material loss became mainly at the austenite phase and spread to the ferrite phase at a later stage. Cathodic protection decreased slightly the number of cavities. Cross-sectional examinations revealed the presence of microcracks in the bulk of the material. The microcracks initiated at the surface in the ferrite matrix. Crack propagation was impeded by the austenite islands and branched along parallel slip systems.
- OSTI ID:
- 376083
- Report Number(s):
- CONF-960389--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
42 ENGINEERING
AUSTENITE
CATHODIC PROTECTION
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
CORROSION
CRACK PROPAGATION
CRACKS
ELECTRIC POTENTIAL
EXPERIMENTAL DATA
FERRITE
GRAIN BOUNDARIES
IRON BASE ALLOYS
MANGANESE ADDITIONS
MOLYBDENUM ALLOYS
MORPHOLOGY
NICKEL ALLOYS
NITROGEN ADDITIONS
OFFSHORE OPERATIONS
OPTICAL MICROSCOPY
PETROLEUM REFINERIES
POROSITY
SCANNING ELECTRON MICROSCOPY
SILICON ADDITIONS
ULTRASONIC WAVES
WEIGHT MEASUREMENT