2019 Pittsburgh AISTech

Non-Metallic Inclusion Change in the Third-Generation AHSS With High Manganese, Aluminum and Silicon Contents (Room 410)

07 May 19
10:30 AM - 11:00 AM

Tracks: Ladle & Secondary Refining

Speaker(s): P. Chris Pistorius, POSCO Professor of Materials Science & Eng., Carnegie Mellon University; Dai Tang, Carnegie Mellon University

Third-generation advanced high-strength steels (AHSS) generally have high alloy contents, such as manganese, aluminum and silicon. The higher alloy contents change the way liquid AHSS interacts with inclusions, refractories and slag in the secondary refining process. A laboratory-scale induction furnace experiment was conducted to measure the inclusion evolution for Fe-6Mn-1.5Al-1.5Si with a lime-rich slag (46CaO-45Al2O3-9MgO). It is found that the path of oxide inclusion change is Al2O3-spinel-MgO, with little Ca pickup. Al dominates the deoxidation process with no MnO-type inclusions formed. Al further reduces MgO from the slag and refractories, leading to Mg modification of inclusions.