Long-term materials test program. Quarterly report, January-March 1983
Abstract
Exposure of gas turbine materials to a PFBC effluent under the Long-Term Materials Test Program has reached 1507 hours. Unprotected nickel and cobalt base blade and vane alloys show susceptibility to hot corrosion at 1500/sup 0/F (gas temperature), 1300/sup 0/F, and 1100/sup 0/F (air-cooled pins). Precious metal aluminide and M (Co,Fe) CrAlY overlay coatings continue to show good resistance to corrosion above 1450/sup 0/F, but are susceptible to varying degrees of pitting attack between 1050 and 1300/sup 0/F. Significant erosion/corrosion degradation of both base alloys and protective coatings/claddings has been observed on airfoil specimens exposed at 1350/sup 0/F, 800 to 900 fps and dust loadings less than 100 ppM for 1085 hours. Corrosion predominately occurred in areas of direct particle impaction; i.e., leading edge and pressure surface, indicating an erosion/corrosion synergism. At gas velocities of 1200 to 1400 fps, a platinum-aluminide coated IN-738 pin experienced a metal recession rate of 8 mils/1000-hours. The PFBC facility continues to show excellent operational reliability, accumulating over 1100 test hours this quarter. The only concern from an operations standpoint is the gradual thinning of the in-bed heat exchanger tubing at a rate of about 5 mils/100 hours off the diameter.
- Publication Date:
- Research Org.:
- General Electric Co., Schenectady, NY (USA). Advanced Energy Programs Dept.
- OSTI Identifier:
- 5148015
- Report Number(s):
- DOE/ET/15457-1522
ON: DE84008899
- DOE Contract Number:
- AC21-79ET15457
- Resource Type:
- Technical Report
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 20 FOSSIL-FUELED POWER PLANTS; 36 MATERIALS SCIENCE; FLUIDIZED-BED COMBUSTORS; MATERIALS TESTING; GAS TURBINES; TURBINE BLADES; CORROSION; EROSION; HIGH TEMPERATURE; PROTECTIVE COATINGS; RESEARCH PROGRAMS; VERY HIGH TEMPERATURE; CHEMICAL REACTIONS; COATINGS; COMBUSTORS; MACHINERY; TESTING; TURBINES; TURBOMACHINERY; 200100* - Fossil-Fueled Power Plants- Power Plants & Power Generation; 360105 - Metals & Alloys- Corrosion & Erosion
Citation Formats
. Long-term materials test program. Quarterly report, January-March 1983. United States: N. p., 1984.
Web. doi:10.2172/5148015.
. Long-term materials test program. Quarterly report, January-March 1983. United States. https://doi.org/10.2172/5148015
. 1984.
"Long-term materials test program. Quarterly report, January-March 1983". United States. https://doi.org/10.2172/5148015. https://www.osti.gov/servlets/purl/5148015.
@article{osti_5148015,
title = {Long-term materials test program. Quarterly report, January-March 1983},
author = {},
abstractNote = {Exposure of gas turbine materials to a PFBC effluent under the Long-Term Materials Test Program has reached 1507 hours. Unprotected nickel and cobalt base blade and vane alloys show susceptibility to hot corrosion at 1500/sup 0/F (gas temperature), 1300/sup 0/F, and 1100/sup 0/F (air-cooled pins). Precious metal aluminide and M (Co,Fe) CrAlY overlay coatings continue to show good resistance to corrosion above 1450/sup 0/F, but are susceptible to varying degrees of pitting attack between 1050 and 1300/sup 0/F. Significant erosion/corrosion degradation of both base alloys and protective coatings/claddings has been observed on airfoil specimens exposed at 1350/sup 0/F, 800 to 900 fps and dust loadings less than 100 ppM for 1085 hours. Corrosion predominately occurred in areas of direct particle impaction; i.e., leading edge and pressure surface, indicating an erosion/corrosion synergism. At gas velocities of 1200 to 1400 fps, a platinum-aluminide coated IN-738 pin experienced a metal recession rate of 8 mils/1000-hours. The PFBC facility continues to show excellent operational reliability, accumulating over 1100 test hours this quarter. The only concern from an operations standpoint is the gradual thinning of the in-bed heat exchanger tubing at a rate of about 5 mils/100 hours off the diameter.},
doi = {10.2172/5148015},
url = {https://www.osti.gov/biblio/5148015},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 1984},
month = {Thu Mar 01 00:00:00 EST 1984}
}