Effect of Phase Solidification Sequence in Stainless Steel on Grain Refining Efficiency

Grain refinement of as-cast structure of Cr-Ni stainless steels was experimentally studied using heterogeneous nuclei. Refinement of primary grains was achieved in both cast ferritic and austenitic grades. However, imposing a mixed solidification sequence of FCC and BCC phases resulted in a macrostructure without a recognizable Columnar-to-Equiaxed Transition Zone (CET). Non-metallic inclusions in the casting were recorded using automated scanning electron microscopy/energy-dispersive x-ray spectroscopy method, and simulated with FACTSAGE thermodynamic software. In the discussion, the CFD simulated thermal gradient (G) and isotherm velocity (V) in the casting are plotted on Hunt’s map and compared to the experimental position of CET in different steels.

  • Date:Tuesday, May 8
  • Time:3:00 PM - 3:30 PM
  • Room:113C
  • Location:113C
  • Session Type:Paper and Presentation
  • Master Session:Metallurgy - Steelmaking & Casting - Solidification
  • AIST #:41913-170
  • Attendance #:24
Speakers
Dustin Arvola
Missouri University of Science and Technology
Simon Lekakh
Missouri University of Science and Technology
Ronald O'Malley
Missouri University of Science and Technology
Laura Bartlett
Missouri University of Science and Technology
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