Metallurgical and Materials Transactions A

, Volume 46, Issue 1, pp 190–198 | Cite as

Model Fe-Al Steel with Exceptional Resistance to High Temperature Coarsening. Part II: Experimental Validation and Applications

  • Tihe Zhou
  • Peng Zhang
  • Ronald J. O’Malley
  • Hatem S. Zurob
  • Mani Subramanian
Article
  • 218 Downloads

Abstract

In order to achieve a fine uniform grain-size distribution using the process of thin slab casting and directing rolling (TSCDR), it is necessary to control the grain-size prior to the onset of thermomechanical processing. In the companion paper, Model Fe-Al Steel with Exceptional Resistance to High Temperature Coarsening. Part I: Coarsening Mechanism and Particle Pinning Effects, a new steel composition which uses a small volume fraction of austenite particles to pin the growth of delta-ferrite grains at high temperature was proposed and grain growth was studied in reheated samples. This paper will focus on the development of a simple laboratory-scale setup to simulate thin-slab casting of the newly developed steel and demonstrate the potential for grain size control under industrial conditions. Steel bars with different diameters are briefly dipped into the molten steel to create a shell of solidified material. These are then cooled down to room temperature at different cooling rates. During cooling, the austenite particles nucleate along the delta-ferrite grain boundaries and greatly retard grain growth. With decreasing temperature, more austenite particles precipitate, and grain growth can be completely arrested in the holding furnace. Additional applications of the model alloy are discussed including grain-size control in the heat affected zone in welds and grain-growth resistance at high temperature.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2014

Authors and Affiliations

  • Tihe Zhou
    • 1
  • Peng Zhang
    • 2
  • Ronald J. O’Malley
    • 3
  • Hatem S. Zurob
    • 1
  • Mani Subramanian
    • 1
  1. 1.Department of Materials Science and EngineeringMcMaster UniversityHamiltonCanada
  2. 2.Product DevelopmentEssar Steel Algoma Inc.Sault Ste. MarieCanada
  3. 3.Department of Metallurgical EngineeringMissouri S&TRollaUSA

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