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Title: High-Temperature Performance of Cast CF8C-Plus Austenitic Stainless Steel

Abstract

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 600-900 C, 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.

Authors:
 [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1048744
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Engineering for Gas Turbines and Power
Additional Journal Information:
Journal Volume: 133; Journal Issue: 9; Journal ID: ISSN 0742-4795
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; CASTING; CREEP; GAS TURBINES; HEAT RESISTING ALLOYS; HEAT TREATMENTS; MECHANICAL PROPERTIES; ORNL; OXIDATION; PERFORMANCE; SOLUBILITY; STAINLESS STEELS; STEELS; THERMAL FATIGUE; WATER VAPOR; CF8CPlus; cast austenitic steel; creep; oxidation

Citation Formats

Maziasz, Philip J, and Pint, Bruce A. High-Temperature Performance of Cast CF8C-Plus Austenitic Stainless Steel. United States: N. p., 2011. Web. doi:10.1115/1.4002828.
Maziasz, Philip J, & Pint, Bruce A. High-Temperature Performance of Cast CF8C-Plus Austenitic Stainless Steel. United States. doi:10.1115/1.4002828.
Maziasz, Philip J, and Pint, Bruce A. Sat . "High-Temperature Performance of Cast CF8C-Plus Austenitic Stainless Steel". United States. doi:10.1115/1.4002828.
@article{osti_1048744,
title = {High-Temperature Performance of Cast CF8C-Plus Austenitic Stainless Steel},
author = {Maziasz, Philip J and Pint, Bruce A},
abstractNote = {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 600-900 C, 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.},
doi = {10.1115/1.4002828},
journal = {Journal of Engineering for Gas Turbines and Power},
issn = {0742-4795},
number = 9,
volume = 133,
place = {United States},
year = {2011},
month = {1}
}