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Kinetics of ferrite transformation in an Fe-0.28mass%C-3mass%Mo.pdf

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Kinetics of ferrite transformation in an Fe-0.28mass%C-3mass%Mo

Kinetics of ferrite transformation in an Fe-0.28mass%C-3mass%Mo alloy K.M. Wu, M. Kagayama, M. Enomoto Department of Materials Science, Ibaraki University, Nakanarusawa, Hitachi 316-8511, Japan Received 25 February 2002; received in revised form 14 May 2002 Abstract The morphology and the kinetics of ferrite transformation below the TTT-diagram bay were studied in an Fe-0.28mass%C- 3mass%Mo alloy. The three-dimensional reconstruction of the transformed microstructure revealed that the highly irregular morphology of ferrite observed on the polished specimen surface is formed due to extensive impingement and coalescence of thin rod-like crystals. The transformation stasis was observed consistently with previous observations. The fractions of ferrite achieved by fast carbon diffusion-controlled growth (followed by sluggish alloying element-partitioned growth) were calculated under paraequilibrium and local equilibrium. The calculated fractions of ferrite varied with temperature qualitatively in the same manner as those experimentally observed at the stasis. It is likely that above the bay the ferrite growth falls in the low velocity regime of Cahn’s solute drag theory, whereas below the bay it may fall initially in the high velocity regime, climb up the peak of the drag and enter the stasis. In alloys of lower C and Mo content the growth stasis does not occur presumably because the carbon diffusion- controlled growth can overcome the drag peak. # 2002 Elsevier Science B.V. All rights reserved. Keywords: Iron alloy; Phase transformation; Bainite; Ferrite; Solute drag 1. Introduction The major characteristics of ferrite transformation in hypoeutectoid alloy steels, especially in steels containing Mo and Cr, a strong carbide forming element, include the presence of a bay on the TTT-curves (the transfor- mation kinetics become sluggish at intermediate tem- peratures), incomplete transformation (the transformations ceases temporarily before the fraction transformed reache