|About this Abstract
||MS&T22: Materials Science & Technology
||Steels for Sustainable Development
||Cyclic Deformation and Strain Localization of Ferrite-pearlite Low Alloy Steel under Low-cycle Fatigue
||Shutong Zhang, Rafael Arthur Giorjao, Jacque Berkson, Antonio J. Ramirez
|On-Site Speaker (Planned)
Low alloy steels are commonly used as the structural material for power generation and transportation infrastructure. Cyclic operations under severe thermal and mechanical loading challenge the endurance capacity of the structural steels that guarantees the structural integrity and the maintenance costs. In this study, the cyclic deformation and strain location of a ferrite-pearlite steel under low-cycle fatigue tests is investigated. Gleeble-based low-cycle fatigue tests were performed at 0.8%, 1.0%, 1.5% and 2.0% strain amplitudes at 250C. The impact of strain amplitudes upon microstructure deformation is evaluated through EBSD analysis and nanoindentation measurement. In addition, the evolution of microstructure during low-cycle fatigue is investigated at 1.0% strain amplitude. Interrupted test samples were obtained at the 5th cycle, 30th cycle, and 300th cycle and analyzed through EBSD. The study shows ferrite-pearlite grain boundaries are preferential location for strain accumulation, which increases strain amplitude and ferrite-pearlite strength incompatibility.