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A Quantitative Investigation of Cementite Dissolution Kinetics for Continuous Heating of Hypereutectoid Steel

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Abstract

Cementite dissolution kinetics in austenite was investigated in a hypereutectoid steel alloy during continuous heating. The quantitative change in cementite volume fraction as a function of thermal history was determined from dilation curves by using the martensite start temperature to calculate prior austenite carbon content. Two characteristics of the cementite dissolution kinetics were found: (1) the cementite dissolution rate increased with time regardless of heating rate due to the increased surface area of cementite particles, and (2) the rate of cementite dissolution was strongly affected by heating rate. An empirical equation combining the effects of cementite volume change and heating rate is proposed to describe cementite dissolution kinetics. A continuous heating transformation diagram for hypereutectoid steels was obtained and compared with the DICTRA simulations and metallographic analyses.

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Acknowledgments

The support of the Advanced Steel Processing and Products Research Center at the Colorado School of Mines (CSM) is gratefully acknowledged. KDC gratefully acknowledges support from Los Alamos National Security, LLC, operator of the Los Alamos National Laboratory under Contract No. DE-AC52-06NA25396 with the United States Department of Energy. The authors are thankful to Professor C.J. Van Tyne, CSM, for helpful discussions. Sincere thanks to E. Buddy Damm and the Timken Company for supplying the material for this study and performing the initial condition heat treatments. We also thank C.J. Vigil and R.E. Hackenberg, Los Alamos National Laboratory, for use of the dilatometer, and would like to acknowledge Ingo Kurth, Avanel Industries, Inc., for helpful dilatometry discussions.

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Authors and Affiliations

  1. Division of Advanced Materials Engineering, Chonbuk National University, Jeonju, 561-756, Republic of Korea

    Seok-Jae Lee (Assistant Professor)

  2. Materials Science & Technology: Metallurgy (MST-6) Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Kester D. Clarke (R&D Engineer)

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  1. Seok-Jae Lee
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  2. Kester D. Clarke
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Correspondence to Kester D. Clarke.

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Manuscript submitted August 30, 2012.

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Lee, SJ., Clarke, K.D. A Quantitative Investigation of Cementite Dissolution Kinetics for Continuous Heating of Hypereutectoid Steel. Metall Mater Trans A 46, 3917–3923 (2015). https://doi.org/10.1007/s11661-015-2995-0

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  • DOI: https://doi.org/10.1007/s11661-015-2995-0

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