|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||In Situ Synchrotron X-ray Studies on the Deformation Mechanism of Carbon-steel/Copper Nanocomposites
||Kaiyuan Yu, Yadong Ru, Yang Ren, Lishan Cui
|On-Site Speaker (Planned)
Nanostructured steels are expected to acquire a combination of high strength and ductility and exhibit unusual phase transformation and plastic deformation behavior. Nanolamellar high-carbon-steel/Cu composites are fabricated by hot pressing, rolling and wire drawing. Cu suppresses the growth of austenite at elevated temperatures, and subsequent quenching and partitioning treatments result in a large amount of nanosized retained austenite phases, which in return enhance the plasticity of the materials to a maximum elongation of 60%. Unusual double yield plateaus related to stress-induced martensitic transformation are observed. In situ synchrotron X-ray studies suggest: (1) stress-induced martensitic transformation occurs in a manner of Luders band; (2) much more retained austenite is transformed during the stress-induced regime than the strain-induced regime; (3) the deformation mechanism of the composites is a result of the competition between transformation and slip of the retained austenite phases.
||Planned: Supplemental Proceedings volume