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Kinetics of peritectic reaction and transformation in Fe-C alloys

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Abstract

In situ dynamic observation of the progress of a peritectic reaction and transformation of Fe-(0.14 pct C)- and Fe-(0.42 pct C)-peritectic Fe-C alloys has been successfully made with a combination of a confocal scanning laser microscope and an infrared image furnace. The peritectic reaction is characterized by the formation of the γ-austenite phase at the junction of the liquid and the grain boundary of δ-ferrite crystals and subsequent propagation of the three-phase point, liquid/γ/δ, along the liquid/δ boundary, whereas the peritectic transformation occurs by the thickening of the intervening γ toward both the liquid side and the δ side. The rates of the peritectic reaction for the two peritectic alloys are found to be much faster than the rate that would be controlled by carbon diffusion, suggesting that either massive transformation to γ or solidification as γ controls the rate. This is also the case for the Fe-0.14%C transformation in the hypoperitectic alloy. However, the rate of the peritectic transformation in the Fe-0.42%C alloy is determined by carbon diffusion.

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Author notes

  1. M. Suzuki (Associate Professor Chief Research Engineer) & T. Emi (Professor Jernkontoret Professor)

    Present address: the Institute for Advanced Materials Processing, Tohoku University, 980-8577, Sendai, Japan

  2. Y. Arai (Graduate Student Research Engineer)

    Present address: Graduate School of Engineering, Tohoku University, Japan

Authors and Affiliations

  1. the Institute for Advanced Materials Processing, Tohoku University, 980-8577, Sendai, Japan

    H. Shibata (Research Associate)

  2. Materials Research Department, Corporate R & D Laboratories, Sumitomo Metal Industries, Ltd., 660-0891, Amagasaki, Japan

    Y. Arai (Graduate Student Research Engineer)

  3. Steelmaking Research Department, Materials and Processing Research Center, NKK Corporation, 721-8510, Fukuyama, Japan

    M. Suzuki (Associate Professor Chief Research Engineer)

  4. Royal Institute of Technology, SE-10044, Stockholm, Sweden

    T. Emi (Professor Jernkontoret Professor)

Authors
  1. H. Shibata
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  2. Y. Arai
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  3. M. Suzuki
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  4. T. Emi
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Additional information

This article is based on a presentation made in the “Geoffrey Belton Memorial Symposium,” held in January 2000, in Sydney, Australia, under the joint sponsorship of ISS and TMS.

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Shibata, H., Arai, Y., Suzuki, M. et al. Kinetics of peritectic reaction and transformation in Fe-C alloys. Metall Mater Trans B 31, 981–991 (2000). https://doi.org/10.1007/s11663-000-0074-3

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  • DOI: https://doi.org/10.1007/s11663-000-0074-3

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