|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations in Multi-component Systems: An MPMD Symposium Honoring Gary R. Purdy
||Formation of Widmanstätten Ferrite by the Dynamic Transformation of Austenite at Temperatures Well above the Ae3
||John Joseph Jonas, Clodualdo Aranas
|On-Site Speaker (Planned)
Eight steels of increasing carbon contents were deformed in the austenite phase field. Widmanstätten ferrite was observed to form displacively at temperatures right up to 1350 °C. Critical strains in the range 0.06-0.14 were required. During deformation, the ferrite plates coalesced into polygonal grains several microns in diameter. On holding after deformation, the ferrite slowly retransformed into austenite by means of diffusional processes. The driving force for the forward transformation is the softening associated with the replacement of work-hardened austenite by softer, strain-free ferrite. The driving force developed is used to overcome: i) the free energy difference between the phases, as well as ii) the work of dilatation and iii) of shear accommodation.
||Planned: A print-only volume