Long term materials test program materials evaluation. Improved simulation tests

Technical Report · Wed Jul 01 04:00:00 EDT 1981

OSTI ID:6085455

The screening/simulation testing completed to date has revealed the following significant findings: (1) In the small burner rig tests the PFB particulate did not cause hot corrosion/sulfidation of the gas turbine in the absence of additional corrosion contaminants. In the presence of a high concentration of alkali sulfate condensate, the flyash appears to inhibit hot corrosion attack. (2) In the erosion/corrosion simulator tests the PFBC particulate alone caused hot corrosion/sulfidation of IN-738 even in the absence of any additional corrosion contaminants. This occurrence of sulfide formation in the high velocity (960 to 1170 ft/s) simulator testing but not in the low velocity (90 ft/s) burner rig testing may be related to the oxide stability on the material surfaces. The high-temperature gas turbine alloys develop their corrosion resistance through the formation of protective oxide (Al/sub 2/O/sub 3/, Cr/sub 2/O/sub 3/) layers. The high velocity impingement of particulate causes exfoliation/spalling of these protective oxides. (3) The M(Co,Fe)CrA1Y materials appear to be completely adequate for the PFB environment under operating conditions of 1600/sup 0/F, < 1000 ft/s and 100 ppM particulate loading. These alloys may be susceptible to rapid degradation at higher velocities (1100 to 1200 ft/s) or large particle erosion/corrosion conditions. These alloys will all be tested in the LTMT facility to verify these performance characteristics under actual PFB operating conditions. (4) The simulator tests to date produced the following alloy ranking with respect to susceptibility to erosion/corrosion degradation: FSX-414 most susceptible, followed by IN-738, the PVD MCrA1Y coatings, and the CoCrA1Y and FeCrA1Y cladding materials most resistant to deterioration.

• Research Organization: General Electric Co., Schenectady, NY (USA). Energy Systems Programs Dept.
• DOE Contract Number: AC21-79ET15457
• OSTI ID: 6085455
• Report Number(s): DOE/ET/15457-22; ON: DE82002988
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200104* -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360000 -- Materials
42 ENGINEERING
420500 -- Engineering-- Materials Testing
ALLOYS
ALUMINIUM ALLOYS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CLADDING
COAL
COBALT ALLOYS
COBALT BASE ALLOYS
COMBUSTION
CORROSION RESISTANCE
DEPOSITION
ENERGY SOURCES
EROSION
FOSSIL FUELS
FUELS
GAS TURBINES
INCONEL 738
INCONEL ALLOYS
MACHINERY
MATERIALS
MATERIALS TESTING
METALLOGRAPHY
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
OXIDATION
SULFIDATION
SURFACE COATING
TANTALUM ALLOYS
TEST FACILITIES
TESTING
THERMOCHEMICAL PROCESSES
TITANIUM ALLOYS
TUNGSTEN ALLOYS
TURBINES
TURBOMACHINERY