|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Ultrafine-grained Materials X
||Strategies to Improve the Fatigue Crack Growth Behavior of SPD-processed Metals
||Anton Hohenwarter, Thomas Leitner
|On-Site Speaker (Planned)
In this contribution an overview on the fatigue crack behavior of various SPD-processed pure metals (iron and nickel) and alloys (NiTi, various steels) is given. The deteriorated fatigue crack growth behavior, often reported in literature, is attributed to a reduction of crack closure contributions. In addition, frequently a transition from transgranular to intergranular fatigue fracture is observed, which seems to have a lower crack growth resistance than transgranular crack growth. In order to mitigate these tendencies different strategies for enhancement of this behavior will be discussed. It will be shown that a sole increase of strength without changing the failure type can result in an improvement of the fatigue crack growth behavior. An even more pronounced beneficial effect can be expected from tailoring the grain shape. Specifically strongly elongated structures allow for specific crack growth directions a comparable fatigue crack growth behavior to coarse-grained counterparts.
||Planned: Supplemental Proceedings volume