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Title: Field and laboratory evaluations of commercial and next–generation alumina-forming austenitic foil for advanced recuperators

Alumina-forming austenitic (AFA) steels represent a new class of corrosion- and creep-resistant austenitic steels designed to enable higher temperature recuperators. Field trials are in progress for commercially rolled foil with widths over 39 cm. The first trial completed 3000 hrs in a microturbine recuperator with an elevated turbine inlet temperature and showed limited degradation. A longer microturbine trial is in progress. A third exposure in a larger turbine has passed 16,000 hrs. Furthermore, to reduce alloy cost and address foil fabrication issues with the initial AFA composition, several new AFA compositions are being evaluated in creep and laboratory oxidation testing at 650–800 °C and the results compared to commercially fabricated AFA foil and conventional recuperator foil performance.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Capstone Turbines Corp., Chatsworth, CA (United States)
Publication Date:
OSTI Identifier:
1279442
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Engineering for Gas Turbines and Power
Additional Journal Information:
Journal Volume: 138; Journal Issue: 12; Journal ID: ISSN 0742-4795
Publisher:
ASME
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE microturbines; AFA steel; recuperator; oxidation; creep; temperature; alloys; engines; testing; oxidation; turbines; manufacturing