Covers and casings of small to medium size gas turbines can be made from cast austenitic stainless steels, including grades such as CF8C, CF3M, or CF10M. Oak Ridge National Laboratory and Caterpillar have developed a new cast austenitic stainless steel, CF8C-Plus, which is a fully austenitic stainless steel, based on additions of Mn and N to the standard Nb-stabilized CF8C steel grade. The Mn addition improves castability, as well as increases the alloy solubility for N, and both Mn and N synergistically act to boost mechanical properties. CF8C-Plus steel has outstanding creep-resistance at , which compares well with Ni-based superalloys such as alloys X, 625, 617, and 230. CF8C-Plus also has very good fatigue and thermal fatigue resistance. It is used in the as-cast condition, with no additional heat-treatments. While commercial success for CF8C-Plus has been mainly for diesel exhaust components, this steel can also be considered for gas turbine and microturbine casings. The purposes of this paper are to demonstrate some of the mechanical properties, to update the long-term creep-rupture data, and to present new data on the high-temperature oxidation behavior of these materials, particularly in the presence of water vapor.
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September 2011
Research Papers
High-Temperature Performance of Cast CF8C-Plus Austenitic Stainless Steel
Philip J. Maziasz,
Philip J. Maziasz
Materials Science and Technology Division,
Oak Ridge National Laboratory
, Oak Ridge, TN 37831-6156
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Bruce A. Pint
Bruce A. Pint
Materials Science and Technology Division,
e-mail: pintba@ornl.gov
Oak Ridge National Laboratory
, Oak Ridge, TN 37831-6156
Search for other works by this author on:
Philip J. Maziasz
Materials Science and Technology Division,
Oak Ridge National Laboratory
, Oak Ridge, TN 37831-6156
Bruce A. Pint
Materials Science and Technology Division,
Oak Ridge National Laboratory
, Oak Ridge, TN 37831-6156e-mail: pintba@ornl.gov
J. Eng. Gas Turbines Power. Sep 2011, 133(9): 092102 (5 pages)
Published Online: April 15, 2011
Article history
Received:
June 28, 2010
Revised:
July 19, 2010
Online:
April 15, 2011
Published:
April 15, 2011
Citation
Maziasz, P. J., and Pint, B. A. (April 15, 2011). "High-Temperature Performance of Cast CF8C-Plus Austenitic Stainless Steel." ASME. J. Eng. Gas Turbines Power. September 2011; 133(9): 092102. https://doi.org/10.1115/1.4002828
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