Corrosion fatigue of steam turbine-blading alloys in operational environments. Final report. [Ti-6Al-4V]
The corrosion fatigue strengths of Type 403 and 17-4 PH stainless steel and several processing variations of Ti-6Al-4V were determined in various steam turbine environments. Steam and turbine deposits were analyzed to establish test environments. Pure 80/sup 0/C water base line data was determined and compared to saturated aqueous solutions of NaCl, Na/sub 2/SO/sub 4/, Na/sub 3/PO/sub 4/, Na/sub 2/SiO/sub 3/ and some mixtures of these. The pH and oxygen content were also varied. Fatigue strengths at 20 kHz and 100 Hz were established for 10/sup 9/ and 10/sup 7/ cycles, respectively. The corrosion fatigue effect of notches, shot peening and mean stress were measured. Acidic, high oxygen 22% NaCl solutions were found to be extremely aggressive, causing Type 403 to lose 87% of its pure water fatigue strength; more basic solutions and other chemical species were less severe. The Ti-6Al-4V alloys were only mildly affected in most environments although NaOH plus SiO/sub 2/ was found to dissolve this alloy. The effect of the environments on 17-4 PH was intermediate between Type 403 and Ti-6Al-4V.
- Research Organization:
- Westinghouse Electric Corp., Pittsburgh, PA (USA)
- OSTI ID:
- 6363865
- Report Number(s):
- EPRI-CS-2932; ON: TI85920063
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
CORROSION FATIGUE
STAINLESS STEEL-403
STEAM TURBINES
MATERIALS TESTING
TITANIUM BASE ALLOYS
TURBINE BLADES
VANADIUM ALLOYS
AQUEOUS SOLUTIONS
CRACKS
SODIUM CHLORIDES
SODIUM PHOSPHATES
SODIUM SILICATES
SODIUM SULFATES
STAINLESS STEEL-17-4PH
WATER
ALKALI METAL COMPOUNDS
ALLOYS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM STEELS
CORROSION RESISTANT ALLOYS
DISPERSIONS
FATIGUE
HALIDES
HALOGEN COMPOUNDS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MACHINERY
MATERIALS
MECHANICAL PROPERTIES
MIXTURES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
SILICATES
SILICON COMPOUNDS
SODIUM COMPOUNDS
SOLUTIONS
STAINLESS STEELS
STEELS
SULFATES
SULFUR COMPOUNDS
TESTING
TITANIUM ALLOYS
TURBINES
TURBOMACHINERY
360105* - Metals & Alloys- Corrosion & Erosion