Long term materials test program: materials evalation, improved simulation tests

Technical Report · Tue Sep 01 04:00:00 EDT 1981

OSTI ID:6090077

The overall objective of the Long Term Materials Test (LTMT) Program is to identify promising corrosion-resistant materials for coal-fired gas turbine applications by exposing candidate turbine materials to a realistic pressurized fluidized bed combustor environment for up to 14,000 hours. This report is a summary of the material screening tests performed in conjunction with the LTMT Program. The testing was designed to provide preliminary performance data on a variety of alloys through a series of short-term screening tests in simulated PFB environments. Two types of screening tests under atmospheric pressure were performed; small burner rig tests and testing of airfoil-shaped specimens in a high-temperature, high-velocity, erosion/corrosion simulator. Candidate gas turbine materials evaluated in the simulator tests included a cast, cobalt-base vane alloy, FSX-414, and a cast, nickel-base blade alloy, IN-738. In addition, several protection systems were tested: CoCrAlY and FeCrAlY applied to IN-738 substrates by a physical vapor deposition (PVD) process, and M(Co,Fe)CrAlY materials of similar composition applied to IN-738 by a glass-HIP cladding process. In the simulator tests FSX-414 exhibited the highest susceptibility to erosion/corrosion degradation followed by IN-738; the PVD (Co,Fe)CrAlY alloys were somewhat more resistant and the two cladding alloy compositions were most resistant to erosion/corrosion. Of particular significance was the fact that the MCrAlY materials which appeared completely adequate at lower velocity (960 ft/s) and fine particle loading, became highly susceptible to deterioration at high velocity (1170 ft/s) and large particle erosion/corrosion conditions.

• Research Organization: General Electric Co., Schenectady, NY (USA). Energy Systems Programs Dept.
• DOE Contract Number: AC21-79ET15457
• OSTI ID: 6090077
• Report Number(s): DOE/ET/15457-182; ON: DE82000649
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CLADDING
COATINGS
COBALT ALLOYS
COBALT BASE ALLOYS
COMBUSTORS
CORROSION RESISTANCE
DATA
DEPOSITION
EROSION
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTORS
GAS TURBINES
INCONEL 738
INCONEL ALLOYS
INFORMATION
MACHINERY
MATERIALS
MATERIALS TESTING
MEDIUM PRESSURE
METALLOGRAPHY
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUMERICAL DATA
PROTECTIVE COATINGS
SURFACE COATING
TANTALUM ALLOYS
TEST FACILITIES
TESTING
TITANIUM ALLOYS
TUNGSTEN ALLOYS
TURBINES
TURBOMACHINERY