|About this Abstract
||Materials Science & Technology 2011
||Fatigue and Microstructure: A Symposium on Recent Advances
||Low-Cycle-Fatigue Behavior of Modified and Unmodified Alloy CF8C-Plus at 800C
||Deepak Kumar, Amit Shyam, Bruce A. Pint, Edgar Lara-Curzio
|On-Site Speaker (Planned)
The overall thermal efficiency of advanced internal combustion engines can be enhanced by increasing the engine service temperature and by using turbo-chargers to recover waste heat from the exhaust gases. However, current alloys used in exhaust systems, such as SiMo cast-iron and CF8C are reaching their operating limit of 700-750C and may not be suitable for these applications. Recently, (Mn+N) and (Mn+N+Cu+W)-modified versions of alloy CF8C, named as CF8C-Plus and (Cu+W)-modified CF8C-Plus, were developed at Oak Ridge National Laboratory in collaboration with Caterpillar, Inc. The creep resistance of CF8C-Plus and (Cu+W)-modified CF8C-Plus is superior to SiMo cast iron and alloy CF8C for up to 800C. The objective of the current research was to evaluate the low-cycle-fatigue behavior of CF8C-Plus and (Cu+W)-modified CF8C-Plus at 800C with strain amplitude varying between 0.5% and 2%. SEM and TEM were employed to understand the crack initiation and propagation behaviors in these alloys.
||Definite: A CD-only volume