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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Dynamic Behavior of Materials VIII
Presentation Title E-32: Microstructural Evolution in Fe-10Ni-0.1C Steel during Dynamic Deformation
Author(s) Ian Harding, Sharvan Kumar
On-Site Speaker (Planned) Ian Harding
Abstract Scope 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.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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E-28: Development of a Dynamic Materials Processing and Testing Equipment
E-29: Dynamic Response of AA2519-T8 Aluminum Alloy under High Strain Rate Loading
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E-35: Shock-induced Mechanical Response and Substructural Evolution of Ti–6Al–4V Alloy
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