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Dilatometric Analysis of Phase Fraction during Austenite Decomposition into Banded Microstructure in Low-Carbon Steel

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Abstract

The evolution of microstructural bands in low-carbon steel gives rise to the orientation dependence of dilatation behavior, which is associated with a distinct, specimen-orientation-dependent, nonisotropic dilatation. In this article, the authors attempt to analyze the phase fraction from the dilatometric curve, which shows orientation dependence due to the effect of microstructural directionality. The contribution of nonisotropic dilatation to the observed dilatation behavior is quantified and integrated into the analysis procedure by considering its evolution from the microstructural and the geometric effects. The proposed dilatometric analysis is applied to the evaluation of the phase fraction during austenite decomposition into a banded microstructure in a low-carbon steel. From dissimilar dilatometric curves measured along different specimen orientations, the phase fractions involved with the austenite decomposition can be consistently evaluated with the proposed analysis procedure. The analysis results are also in agreement with the metallographically analyzed ones.

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Notes

  1. Dilatronic III is a trademark of Theta Industries, Inc., Port Washington, NY.

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Acknowledgments

The authors acknowledge the Korean Government (MOCIE) for its financial support. One of the authors (HNH) also thanks the Korea Science and Engineering Foundation (KOSEF) for Grant No. R0A-2007-000-10014-0, which was funded by the Korean government (MOST).

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Authors and Affiliations

  1. Department of Advanced Metallic Materials, Korea Institute of Materials Science, Kyungnam, 641-010, Korea

    Dong-Woo Suh (Senior Researcher), Chang-Seok Oh (Principal Researcher) & Sung-Joon Kim (Principal Researcher)

  2. School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea

    Heung Nam Han (Assistant Professor)

Authors
  1. Dong-Woo Suh
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  2. Chang-Seok Oh
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  3. Heung Nam Han
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  4. Sung-Joon Kim
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Corresponding author

Correspondence to Dong-Woo Suh.

Additional information

Manuscript submitted June 15, 2007.

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Suh, DW., Oh, CS., Han, H. et al. Dilatometric Analysis of Phase Fraction during Austenite Decomposition into Banded Microstructure in Low-Carbon Steel. Metall Mater Trans A 38, 2963–2973 (2007). https://doi.org/10.1007/s11661-007-9361-9

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