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The distribution of substitutional alloying elements during the bainite transformation

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Abstract

The behavior of substitutional alloying elements during and after the growth of upper bainite in Fe-Mn-Si-C and Fe-Mn-Si-C-Mo alloy steels has been examined using an atomic resolution microanalysis technique. From the results obtained, and judging from published data, it is concluded that manganese, nickel, silicon, chromium, and molybdenum do not redistribute during the growth of bainitic ferrite. Their concentrations are found to be uniform both at and in the vicinity of the transformation interface, with no indications of any segregation to the transformation interface during growth. However, prolonged annealing at the isothermal transformation temperature, after the formation of bainite has stopped, eventually stimulates the partitioning of substitutional alloying elements as the system tends toward equilibrium. The results demonstrate the existence of an atomic correspondence between the parent and product phases during transformation, the effect of substitutional alloying additions being manifestedvia a modification of the driving force for transformation.

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Authors and Affiliations

  1. Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, CB2 3QZ, Cambridge, UK

    H. K. D. H. Bhadeshia (Lecturer)

  2. Department of Metallurgy and Science of Materials, University of Oxford, Parks Road, OX1 3PH, Oxford, UK

    I. Stark (Research Associate) & G. D. W. Smith (Lecturer)

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  1. I. Stark
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  2. G. D. W. Smith
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  3. H. K. D. H. Bhadeshia
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Additional information

This paper is based on a presentation made in the symposium “International Conference on Bainite” presented at the 1988 World Materials Congress in Chicago, IL, on September 26 and 27, 1988, under the auspices of the ASM INTERNATIONAL Phase Transformations Committee and the TMS Ferrous Metallurgy Committee.

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Stark, I., Smith, G.D.W. & Bhadeshia, H.K.D.H. The distribution of substitutional alloying elements during the bainite transformation. Metall Trans A 21, 837–844 (1990). https://doi.org/10.1007/BF02656567

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