Creep Strength and Microstructure of Al20-25+Nb Alloy Sheets and Foils for Advanced Microturbine Recurperators
Conference
·
OSTI ID:930701
- ORNL
The Oak Ridge National Laboratory (ORNL) and ATI Allegheny Ludlum worked together on a collaborative program for about two years to produce a wide range of commercial sheets and foils of the new AL20-25+Nb{trademark} (AL20-25+Nb) stainless alloy for advanced microturbine recuperator applications. There is a need for cost-effective sheets/foils with more performance and reliability at 650-750 C than 347 stainless steel, particularly for larger 200-250 kW microturbines. Phase 1 of this collaborative program produced the sheets and foils needed for manufacturing brazed plated-fin air cells, while Phase 2 provided foils for primary surface air cells, and did experiments on modified processing designed to change the microstructure of sheets and foils for improved creep-resistance. Phase 1 sheets and foils of AL20-25+Nb have much more creep-resistance than 347 steel at 700-750 C, and those foils are slightly stronger than HR120 and HR230. Results for Phase 2 showed nearly double the creep-rupture life of sheets at 750 C/100 MPa, and similar improvements in foils. Creep data show that Phase 2 foils of AL20-25+Nb alloy have creep resistance approaching that of alloy 625 foils. Testing at about 750 C in flowing turbine exhaust gas for 500 h in the ORNL Recuperator Test Facility shows that foils of AL20-25+Nb alloy have oxidation-resistance similar to HR120 alloy, and much better than 347 steel.
- Research Organization:
- Oak Ridge National Laboratory (ORNL)
- Sponsoring Organization:
- OE USDOE - Office of Electric Transmission and Distribution; EE USDOE - Office of Energy Efficiency and Renewable Energy (EE)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 930701
- Country of Publication:
- United States
- Language:
- English
Similar Records
Overview of Creep Strength and Oxidation of Heat-Resistant Alloy Sheets and Foils for Compact Heat Exchangers
Overview of Creep Strength and Oxidation of Heat-Resistant Alloy Sheets and Foils for Compact Heat-Exchangers
Comparison of Three Primary Surface Recuperator Alloys
Journal Article
·
Sat Dec 31 23:00:00 EST 2005
· Journal of Turbomachinery
·
OSTI ID:985304
Overview of Creep Strength and Oxidation of Heat-Resistant Alloy Sheets and Foils for Compact Heat-Exchangers
Conference
·
Fri Dec 31 23:00:00 EST 2004
·
OSTI ID:1003181
Comparison of Three Primary Surface Recuperator Alloys
Journal Article
·
Thu Dec 31 23:00:00 EST 2009
· Journal of Engineering for Gas Turbines & Power
·
OSTI ID:973543