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Metallurgical and Materials Transactions A

, Volume 46, Issue 11, pp 5240–5247 | Cite as

Experimental Verification of a Critical Condition for the Formation of As-Cast Coarse Columnar Austenite Grain Structure in a Hyperperitectic Carbon Steel

  • Munekazu OhnoEmail author
  • Masato Maruyama
  • Kiyotaka Matsuura
Article

Abstract

Experimental verification of a critical condition for the formation of coarse columnar γ grain (CCG) structure in as-cast hyperperitectic carbon steels, which was put forward based on theories of grain growth and phase-field simulations in early studies, is carried out by means of a Bridgman-type directional solidification experiment. The occurrence of the discontinuous and continuous grain growth processes and the resulting formation of CCG and equiaxed γ grain structures, respectively, are demonstrated. Importantly, these changes of the as-cast microstructures and the grain growth modes are in excellent agreement with the previously proposed critical condition of the CCG formation.

Keywords

Carbon Steel Critical Velocity Transition Depth Peritectic Reaction Migration Velocity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgment

This work is partly supported by The 19th Steel making Committee’s Research Grant, JSPS, Japan.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2015

Authors and Affiliations

  • Munekazu Ohno
    • 1
    Email author
  • Masato Maruyama
    • 2
    • 3
  • Kiyotaka Matsuura
    • 1
  1. 1.Division of Materials Science and Engineering, Faculty of EngineeringHokkaido UniversitySapporoJapan
  2. 2.Graduate School of EngineeringHokkaido UniversitySapporoJapan
  3. 3.JFE Steel CorporationOkayamaJapan

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