|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Boron Segregation and its Effects in Boron Containing Steels
||Kara Luitjohan, David Johnson, Volkan Ortalan
|On-Site Speaker (Planned)
The hardenability of steels can be improved by the addition of small amounts of boron. Even in small quantities, as low as 0.0004 wt.%, the addition of boron can cause low temperature remelting to occur, leading to the formation of defects during casting. This remelting is associated with segregation of boron and a metatectic reaction in which delta-ferrite transforms to austenite and liquid. However, in terms of the phase diagram, the metatectic reaction is not well characterized. In this study, we utilize levitation zone melting to create a range of composition profiles in Fe-B and Fe-B-C alloys. The controlled segregation of boron along the length of the directionally solidified ingots is characterized by electron energy loss spectroscopy in a scanning transmission electron microscope. These results are compared to the boron segregation in various cast microstructures to better understand the solidification reaction sequences and the remelting phenomena.
||Planned: A print-only volume