Abstract
Transformation strains measured via dilatometry and phase fractions measured by optical metallography were used to develop a two-stage, conversional model to accurately determine phase fraction directly and continuously from measured dilation strains for multiphase transformations. The multiphase ferrite + pearlite to austenite transformation was analyzed here, but the two-stage conversional model developed may also be applied to other multiphase transformations. It was found that the lever rule provides accurate results for single-phase to single-phase transformations; the use of a conversional model is not necessary in this case.
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Acknowledgements
Partial support from the Advanced Steel Processing and Products Research Center at the Colorado School of Mines (CSM) is gratefully acknowledged. SJL appreciates the support by SeAH Besteel R&D Center and Business for Academic-industrial Cooperative establishments funded Korea Small and Medium Business Administration in 2014 (Grant No. 1503002010). Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under contract DEAC52-06NA25396. KDC was partially supported by the Innovative Manufacturing Initiative of the Office of Advanced Manufacturing (AMO) at the US Department of Energy (Award DE-EE0005765) during the preparation of this manuscript.
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Clarke, K.D., Van Tyne, C.J. & Lee, SJ. Correlation Between Crystal Structure Change and Transformation Strain for Multiphase Transformations. JOM 68, 198–202 (2016). https://doi.org/10.1007/s11837-015-1670-7
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DOI: https://doi.org/10.1007/s11837-015-1670-7