Creep Behavior of a New Cast Austenitic Alloy

Journal Article · Mon Jan 01 00:00:00 EST 2007 · International Journal of Pressure Vessels and Piping

DOI:https://doi.org/10.1016/j.ijpvp.2006.09.014· OSTI ID:931256

Shingledecker, John P ^[1]; Maziasz, Philip J ^[1]; Evans, Neal D ^[1]; Pollard, Michael J ^[2]

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1. ORNL
2. Caterpillar Technical Center

A new cast austenitic alloy, CF8C-Plus, has been developed by Oak Ridge National Laboratory (ORNL) and Caterpillar for a wide range of high temperature applications including diesel exhaust components and turbine casings. The creep strength of the CF8C-Plus steel is much greater than that of the standard cast CF8C stainless steel and is comparable to the highest strength wrought commercial austenitic stainless steels and alloys, such as NF709. The creep properties of CF8C-Plus are discussed in terms of the alloy design methodology and the evaluation of some long-term creep tested specimens (over 20,000 hours). Microcharacterization shows that the excellent creep strength is due mainly to the precipitation of very fine nano-scale and stable MC carbides, without the formation of deleterious intermetallic phases.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 931256
• Journal Information: International Journal of Pressure Vessels and Piping, Vol. 84
• Country of Publication: United States
• Language: English

Related Subjects

creep
austenitic alloys
stainless steels
castings
engineered microstructure
MC carbides