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The mean size of plate martensite: influence of austenite grain size, partitioning, and transformation heterogeneity

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Abstract

The evolution of transformation microstructure during martensite transformation is revisited. The influence of “spread” heterogeneity on current partitioning concepts is assessed. Following that, a method to infer details of martensite transformation in an average austenite grain is described. The results indicate that the mean martensite plate size may remain constant up to a significant extent of grain transformation. Moreover, it is found that the mean martensite plate volume in fine grain austenite is proportionally larger than that observed with coarse grain austenite, and these effects are ascribed to autocatalysis. Finally, a transformation model is derived which accurately describes the data up to Vv = 0.65, irrespective of austenite grain size.

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Authors and Affiliations

  1. Department of Materials Science and Metallurgy, Instituto Militar de Engenharia, Pca. Gen. Tibúrcio 80, 22290, Rio de Janeiro, RJ, Brazil

    J. R. C. Guimarães (Lecturer) & A. Saavedra (Assistant Professor)

  2. Cia. Brasileira de Metalurgia e Mineração, R. Pe João Manoel 923, 9suth, 01411, São Paulo, SP, Brazil

    J. R. C. Guimarães (Lecturer)

Authors
  1. J. R. C. Guimarães
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  2. A. Saavedra
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Guimarães, J.R.C., Saavedra, A. The mean size of plate martensite: influence of austenite grain size, partitioning, and transformation heterogeneity. Metall Trans A 16, 329–336 (1985). https://doi.org/10.1007/BF02814331

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  • DOI: https://doi.org/10.1007/BF02814331

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