|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Dynamic Behavior of Materials VIII
||E-32: Microstructural Evolution in Fe-10Ni-0.1C Steel during Dynamic Deformation
||Ian Harding, Sharvan Kumar
|On-Site Speaker (Planned)
During dynamic deformation, steels that thermally soften readily and those that exhibit low work-hardening rates are prone to shear localization and the development of adiabatic shear bands (ASB) that promote failure. An important component of the approach to mitigate their occurrence is to understand the microstructural evolution within, adjacent to and away from such ASBs. In this context, we consider the microstructural evolution in heat-treated Fe-10Ni-0.1C steel, whose precipitated austenite phase may discourage localization by transforming to martensite during dynamic deformation and locally enhancing work-hardening. Compression Split-Hopkinson bar tests were conducted to generate ASBs in the steel. Nanoindentation enabled characterization of local variation in mechanical response of the inhomogeneously deformed specimens. Using FIB-liftout TEM specimens in conjunction with micro-diffraction and STEM-EDX, location-specific microstructure was quantified (by mapping onto the original microstructure) to determine the critical Ni concentration that produces mechanically unstable austenite precipitates that can transform to enhance dynamic response.
||Planned: Supplemental Proceedings volume