| About this Abstract |
| Meeting |
Materials Science & Technology 2011
|
| Symposium
|
Fatigue and Microstructure: A Symposium on Recent Advances
|
| Presentation Title |
Low-Cycle-Fatigue Behavior of Modified and Unmodified Alloy CF8C-Plus at 800C |
| Author(s) |
Deepak Kumar, Amit Shyam, Bruce A. Pint, Edgar Lara-Curzio |
| On-Site Speaker (Planned) |
Deepak Kumar |
| Abstract Scope |
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. |
| Proceedings Inclusion? |
Definite: A CD-only volume |