|About this Abstract
||Materials Science & Technology 2011
||Fatigue and Microstructure: A Symposium on Recent Advances
||Microstructure Evolution from the Free Surface in a Fatigue Haynes 230 Nickel Alloy
||David Gross , Buyang Cao, Garrett Pataky, Ian M Robertson , Huseyin Sehitoglu
|On-Site Speaker (Planned)
Digital image correlation has been employed to follow the evolution of strain ahead of a crack during cyclic loading in a Haynes 230 Nickel alloy at room temperature. Distinct shear bands were identified emanating from the crack. To correlate these results with the evolved microstructure, samples were extracted from various locations along the shear bands such that the microstructure could be determined as a function of depth from the free surface. The microstructure was found to be dependent on the distance from the free surface, changing from an ultra-fine grained to a banded structure with increasing depth. The formation of this microstructure will be discussed in terms of the dislocation processes and the formation of low-energy structures that form during cyclic loading.
||Definite: A CD-only volume