|About this Abstract
||Materials Science & Technology 2012
||In-situ Characterization of Phase Transformations in Materials
||Phase Transformation of Nanostructured Bainitic Steel Using Advanced Characterization Techniques
||Khushboo Rakha, Ilana B. Timokhina, K-S Liss, S. Kabra, P.D. Hodgson, Hossein Beladi
|On-Site Speaker (Planned)
The phase transformation of nanobainitic steel was investigated using in-situ neutron diffraction along with atom probe tomography (APT) and transmission electron microscopy. The diffraction peak characteristics were fully analysed and it was revealed that the carbon partitioning occurred during nanobainitic lath formation enriching the adjacent austenite in carbon. However, the carbon was not able to fully redistribute throughout the remaining austenite due to its low diffusivity at this isothermal temperature regime. Consequently, two austenite populations with different carbon contents appeared in the microstructure: i) austenite with a carbon content close to the initial steel composition and ii) carbon-enriched austenite located in the vicinity of baintic laths. This resulted in the appearance of an asymmetric austenite peak between ~10% to 90% of phase transformation. The APT revealed the presence of Fe–C clusters and particles in both bainitic ferrite laths and carbon-enriched austenite, segregating predominantly on dislocations and retained austenite/bainite interfaces.