Multi-Phase High Temperature Alloys: Exploration of Alumina-Forming, Creep-Resistant Austenitic Stainless Steels

Conference · Mon Jan 01 04:00:00 EST 2007

OSTI ID:931001

Brady, Michael P ^[1]; Yamamoto, Yukinori ^[1]; Lu, Zhao Ping ^[1]; Maziasz, Philip J ^[1]; Santella, Michael L ^[1]; Pint, Bruce A ^[1]

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1. ORNL

Work in 2007 focused on the development of a new class of heat-resistant austenitic stainless steel alloys which achieved a unique combination of high-temperature creep strength and excellent oxidation resistance via protective Al{sub 2}O{sub 3} scale formation. Strengthening is achieved via the formation of stable nano NbC carbides with/without Fe{sub 2}Nb and related intermetallic phase dispersions, with controlled levels of Al to enable Al{sub 2}O{sub 3} scale formation in both air and air + water vapor environments up to {approx}800-900 C. The developed alloys exhibit comparable creep resistance to that of the best commercial heat-resistant austenitic stainless steels, and the protective Al{sub 2}O{sub 3} scale formation provides oxidation resistance superior to that of advanced Cr{sub 2}O{sub 3}-forming heat-resistant austenitic alloys. Preliminary screening also indicated that the developed Al-modified alloys were amenable to welding.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: FE USDOE - Office of Fossil Energy (FE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931001
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ALLOYS
CARBIDES
CREEP
EXPLORATION
OXIDATION
STAINLESS STEELS
WATER VAPOR
WELDING