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

Abstract

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

Meeting Name

The Iron & Steel Technology Conference and Exposition, AISTech 2018 (2018: May 7-10, Philadelphia, PA)

Department(s)

Materials Science and Engineering

Research Center/Lab(s)

Peaslee Steel Manufacturing Research Center

Keywords and Phrases

Metallurgy; Steelmaking and Casting; Solidification

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2018 Association for Iron & Steel Technology (AIST), All rights reserved.

Publication Date

10 May 2018

Link to Full Text

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