Improvements in high temperature (>700° C) performance of lean chromium stainless steels for power plant efficiency
The Albany Research Center has broad experience in developing oxidation resistant lean chromium alloys. Using alloy design principles, a baseline composition of Fe-16Cr-16Ni-2Mn-1Mo was selected, to which a total of 5 wt% Si and Al additions can be made and retain a fully austenitic microstructure. Cyclic oxidation tests in air for 1000 hours were carried out on alloys with Si only or combined Si and Al additions in the temperature range 700? C to 800? C. Oxidation resistance of alloys with Si only additions were outstanding, particularly at 800? C (i.e., these alloys possessed weight gains 4 times less than a standard type-304 alloy). In addition, Si alloys pre-oxidized at 800? C, showed a zero weight gain in subsequent testing for 1000 hours at 700? C. SEM and ESCA analysis of the oxide films and base material at the oxide/base metal interface were conducted to study potential rate controlling mechanisms. The mechanical properties of the alloys, further modified with carbide forming elements, were also evaluated in this temperature range.
- Research Organization:
- Albany Research Center (ARC), Albany, OR (United States)
- Sponsoring Organization:
- USDOE - Office of Fossil Energy (FE)
- OSTI ID:
- 899017
- Report Number(s):
- DOE/ARC-2002-037; TRN: US200706%%477
- Resource Relation:
- Conference: 27th International Technical Conf. on Coal Utilization & Fuel Systems, March 4-7, 2002, Clearwater, FL (sponsored by The American Society of Mechanical Engineers' Fuels & Combustion Technologies Division (ASME-FACT), the U. S. Department of Energy (U.S. DOE) and the Coal Technology Association (CTA), in cooperation with the National Energy Technology Laboratory of the U.S. Department of Energy (U.S. DOE's NETL))
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
ALLOYS
CARBIDES
CHROMIUM
CHROMIUM ALLOYS
COAL
EFFICIENCY
FUEL SYSTEMS
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDATION
OXIDES
PERFORMANCE
POWER PLANTS
STAINLESS STEELS
TESTING
stainless steel
austenitic stainless steel
lean chromium
power plant efficiency