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Simulation of ferrite growth in continuously cooled low-carbon iron alloys

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Abstract

The growth of a planar ferrite (α): austenite (γ) boundary in low-carbon iron and Fe-Mn alloys continuously cooled from austenite through the (α+γ) two-phase field and the α single-phase field was simulated by incorporating carbon diffusion in austenite, intrinsic boundary mobility, and the drag of an alloying element. At a very high cooling rate (≥ 103 °C/s), the width of the carbon diffusion spike in austenite approaches the limit at which spikes are viable, so that the growth of ferrite in which carbon is not partitioned can occur even above the α solvus. In this context, the upper limiting temperature of partitionless growth of ferrite is the T 0 temperature. In the presence of drag of an alloying element, e.g., Mn, both carbon-partitioned and partitionless growth of ferrite begins to occur at finite undercoolings from the Ae 3, T 0, or α-solvus temperature, at which the driving force for transformation exceeds the drag force. The intrinsic mobility of the α:γ boundary may play a significant role at an extremely high cooling rate (≥105 °C/s).

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Authors and Affiliations

  1. the Department of Materials Science, Ibaraki University, 316-8511, Hitachi, Japan

    M. Enomoto (Professor)

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  1. M. Enomoto
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Additional information

This article is based on a presentation made at the symposium entitled “The Mechanisms of the Massive Transformation,” a part of the Fall 2000 TMS Meeting held October 16–19, 2000, in St. Louis, Missouri, under the auspices of the ASM Phase Transformations Committee.

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Enomoto, M. Simulation of ferrite growth in continuously cooled low-carbon iron alloys. Metall Mater Trans A 33, 2309–2316 (2002). https://doi.org/10.1007/s11661-002-0354-4

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