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Martensite start temperature and the austenite grain-size

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Abstract

The dependence of the martensite start temperature on the austenite grain-size is modeled based upon aspects of martensite nucleation and validated by data reported in the literature. The results obtained support the view that grain boundaries provide an environment for the formation of martensite embryos in annealed austenite. The model can account for a two-stage dependence of martensite start temperature on the austenite grain-size, considering that grain boundaries provide a suitable environment for martensite nucleation, and grain-size also has a stabilizing effect by limiting the volume of individual martensite units.

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Acknowledgements

P. R. Rios is grateful to Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq, and to Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro, FAPERJ, for financial support. P. R. Rios would also like to thank the Humboldt Foundation for the Humboldt Research Award and Professor Günter Gottstein for his hospitality during the author’s stay at Institut für Metallkunde and Metallphysik of RWTH-Aachen where part of this work has been done. The authors are also grateful to Professor Martin Glicksman for his careful reading of the manuscript.

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Authors and Affiliations

  1. Universidade Federal Fluminense, Escola de Engenharia Industrial Metalúrgica de Volta Redonda, Av. dos Trabalhadores, 420, Volta Redonda, RJ, 27255-125, Brazil

    J. R. C. Guimarães & P. R. Rios

  2. RWTH Aachen University, Institut für Metallkunde und Metallphysik, 52056, Aachen, Germany

    P. R. Rios

  3. Mal. Moura 338H/22C, São Paulo, SP, 05641-000, Brazil

    J. R. C. Guimarães

Authors
  1. J. R. C. Guimarães
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  2. P. R. Rios
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Correspondence to P. R. Rios.

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Guimarães, J.R.C., Rios, P.R. Martensite start temperature and the austenite grain-size. J Mater Sci 45, 1074–1077 (2010). https://doi.org/10.1007/s10853-009-4044-0

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  • DOI: https://doi.org/10.1007/s10853-009-4044-0

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