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Title: Alumina-forming Austenitic Alloys for Advanced Recuperators

Abstract

Materials selection for thin-walled recuperators has been extensively investigated over the past decade. In the latest generation of recuperated turbine engines, type 347 stainless steel has been replaced by higher alloyed steels and Ni-base chromia-forming alloys. However, high (linear) rates of chromia evaporation in exhaust gas fundamentally limits the oxidation lifetime of these chromia-forming alloys. One solution is to use alumina-forming alloys that are more resistant to this environment. The lower scale growth kinetics and resistance to evaporation in the presence of water vapor suggests an order of magnitude increase in lifetime for alumina-forming alloys. A significant problem with this strategy was the large drop in creep strength with the addition of sufficient Al to form an external alumina scale. However, new Fe-base austenitic compositions have been developed with sufficient strength for this application above 700 C.

Authors:
 [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
OE USDOE - Office of Electric Transmission and Distribution
OSTI Identifier:
931298
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: ASME Turbo Expo 2007, Montreal, Canada, 20070514, 20070517
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; CREEP; ENGINES; EVAPORATION; KINETICS; LIFETIME; OXIDATION; STAINLESS STEELS; STEELS; TURBINES; WATER VAPOR; Recuperator; austenitic steels; oxidation; foil; water vapor; alumina; evaporation

Citation Formats

Pint, Bruce A, Shingledecker, John P, Brady, Michael P, and Maziasz, Philip J. Alumina-forming Austenitic Alloys for Advanced Recuperators. United States: N. p., 2007. Web.
Pint, Bruce A, Shingledecker, John P, Brady, Michael P, & Maziasz, Philip J. Alumina-forming Austenitic Alloys for Advanced Recuperators. United States.
Pint, Bruce A, Shingledecker, John P, Brady, Michael P, and Maziasz, Philip J. Mon . "Alumina-forming Austenitic Alloys for Advanced Recuperators". United States. doi:.
@article{osti_931298,
title = {Alumina-forming Austenitic Alloys for Advanced Recuperators},
author = {Pint, Bruce A and Shingledecker, John P and Brady, Michael P and Maziasz, Philip J},
abstractNote = {Materials selection for thin-walled recuperators has been extensively investigated over the past decade. In the latest generation of recuperated turbine engines, type 347 stainless steel has been replaced by higher alloyed steels and Ni-base chromia-forming alloys. However, high (linear) rates of chromia evaporation in exhaust gas fundamentally limits the oxidation lifetime of these chromia-forming alloys. One solution is to use alumina-forming alloys that are more resistant to this environment. The lower scale growth kinetics and resistance to evaporation in the presence of water vapor suggests an order of magnitude increase in lifetime for alumina-forming alloys. A significant problem with this strategy was the large drop in creep strength with the addition of sufficient Al to form an external alumina scale. However, new Fe-base austenitic compositions have been developed with sufficient strength for this application above 700 C.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
Other availability
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