|About this Abstract
||2014 TMS Annual Meeting & Exhibition
||Celebrating the Megascale: An EPD Symposium in Honor of David G.C.Robertson
||Ferroalloy Induced Precipitates in Continuously Cast Microalloyed Steels
||Syed Jawad Ali Shah, Hani Henein, Douglas Ivey
|On-Site Speaker (Planned)
Phases exist in commercial grade ferroniobium and ferrotitanium alloys that have melting temperatures greater than steel making temperatures. Niobium-rich solid solution and titanium carbonitride are two high melting temperature phases in ferroniobium and ferrotitanium alloys, respectively. In the present study, the effects of these high melting temperature phases on the precipitation of carbides and nitrides during solidification of steel were studied by using scanning electron microscopy (SEM) and thermodynamic calculations. The phase evolution mechanism of the complex ferrotitanium microstructure was also studied. Titanium carbonitride pre-existing in ferrotitanium, when added during steel making, can act as nucleation sites for the precipitation and growth of carbonitride precipitates and could result in formation of coarse titanium carbonitride particles. The formation of NbC through equilibrium and non-equilibrium (Scheil) solidification routes are compared. The Scheil calculations predict the possible formation of NbC particles in liquid steel.
||Planned: A print-only volume