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Coarsening of Inter- and Intra-granular Proeutectoid Cementite in an Initially Pearlitic 2C-4Cr Ultrahigh Carbon Steel

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Abstract

We have examined spheroidization and coarsening of cementite in an initially pearlitic 2C-4Cr ultrahigh carbon steel containing a cementite network. Coarsening kinetics of spheroidized cementite and growth of denuded zones adjacent to the cementite network were investigated by analyzing particle sizes from digital micrographs of water-quenched steel etched with Nital. Denuded zones grew at a rate proportional to t 1/4–t 1/5. Spheroidization of pearlite was completed within 90 minutes at 1073 K and 1173 K (800 °C and 900 °C), and within 5 minutes at 1243 K (970 °C). Bimodal particle size distributions were identified in most of the samples and were more pronounced at higher temperatures and hold times. Peaks in the distributions were attributed to the coarsening of intragranular and grain boundary particles at different rates. A third, non-coarsening peak of particles was present at 1073 K (800 °C) only and was attributed to particles existing prior to the heat treatment. Particle sizes were plotted vs time to investigate possible coarsening mechanisms. The coarsening exponent for the growth of grain boundary carbides was closest to 4, indicating grain boundary diffusion control. The coarsening exponent was closest to 5 for intragranular carbides, indicating suppression of volumetric diffusion (possibly due to reduced effective diffusivity because of Cr alloying) and control by dislocation diffusion.

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Acknowledgments

The authors appreciate Miller Centrifugal Casting for providing as-cast mill roll parts for this study, as well as their insightful discussions. This project was financed in part by a grant from the Commonwealth of Pennsylvania Department of Community and Economic Development (DCED), Developed in PA Program (D2PA). Funding support is also acknowledged from the National Science Foundation, CMMI Award No. 1436064. The authors acknowledge the use of the Materials Characterization Facility at Carnegie Mellon University supported by grant MCF-677785.

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  1. Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA, 15213, USA

    Matthew D. Hecht, Yoosuf N. Picard & Bryan A. Webler

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  1. Matthew D. Hecht
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  2. Yoosuf N. Picard
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  3. Bryan A. Webler
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Correspondence to Bryan A. Webler.

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Manuscript submitted December 3, 2016.

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Hecht, M.D., Picard, Y.N. & Webler, B.A. Coarsening of Inter- and Intra-granular Proeutectoid Cementite in an Initially Pearlitic 2C-4Cr Ultrahigh Carbon Steel. Metall Mater Trans A 48, 2320–2335 (2017). https://doi.org/10.1007/s11661-017-4012-2

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