Abstract
The steady-state nucleation rates of ferrite allotriomorphs at the “faces” of austenite grain boundaries were measured in Fe-C-X1-X2 alloys, where X1 was Mn and X2 was successively Si, Ni, and Co, using techniques previously developed for counterpart studies on Fe-C and Fe-C-X alloys. The results were compared with the predictions of the classical nucleation theory, using the pillbox-shaped critical nucleus model. The volume free energy changes associated with nucleation in Fe-C-X1-X2 quaternary systems were evaluated from the central atoms model (CAM) for both para- and orthoequilibrium modes of transformation. The nucleation process was assumed to be controlled by volume and/or grain boundary diffusion of alloying elements. The so-called synergistic effects of alloying elements were considered in terms of the volume free energy change and interfacial energies on the basis of the results of the nucleation rate measurements.
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Formerly Graduate Student, Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh,PA
Formerly R.F. Mehl Professor Emeritus at Carnegie Mellon University, is with GEO-Centers, Inc., Ft. Washington, MD,
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Tanaka, T., Aaronson, H.I. & Enomoto, M. Nucleation kinetics of grain boundary allotriomorphs of proeutectoid ferrite in Fe-C-Mn-X2 alloys. Metall Mater Trans A 26, 547–559 (1995). https://doi.org/10.1007/BF02663905
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DOI: https://doi.org/10.1007/BF02663905