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Obtaining an Acicular Microstructure by Thermomechanical Sequences in X-80 Steel

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Microstructural modification is one of the routes to increase strength and toughness in high-strength low-alloy (HSLA) steels. Considering the good mechanical properties of acicular ferrite, thermomechanical sequences, with continuous cooling or isothermal treatment, were applied in an X-80 HSLA steel to obtain dominant acicular microstructure. Electron microscopy and electron back-scattered diffraction (EBDS) analyses were performed to identify and quantify microstructural changes. It was possible to correlate the misorientation boundaries profile with the occurrence of acicular microstructure, which was characterized by a high quantity of substructured and deformed units. Thermomechanical sequences with continuous cooling were more effective for obtaining acicular microstructure than sequences of isothermal treatments.

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The authors would like to thank FACEPE (Foundation of Support for Science and Technology of Pernambuco) for financial support and the LME/LNNano (Laboratory of Electron Microscopy, National Nanotechnology Laboratory) for technical support during EBSD analysis.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Federal University of Pernambuco, Av. Ac. Helio Ramos s/n, Cidade Universitária, Recife, PE, CEP 50740-530, Brazil

    Renato Soares de Castro (Graduate Student), Igor Rafael Vilarouco Pedrosa (Graduate Student), Yogendra Prasad Yadava (Associate Professor) & Ricardo Artur Sanguinetti Ferreira (Associate Professor)

  2. Federal Institute of Education, Science and Technology of Pernambuco, Av. Prof. Luiz Freire, 500, Cidade Universitária, Recife, PE, CEP 50740-540, Brazil

    Renato Soares de Castro (Graduate Student) & Igor Rafael Vilarouco Pedrosa (Graduate Student)

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  1. Renato Soares de Castro
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  2. Igor Rafael Vilarouco Pedrosa
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  3. Yogendra Prasad Yadava
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  4. Ricardo Artur Sanguinetti Ferreira
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Correspondence to Ricardo Artur Sanguinetti Ferreira.

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Manuscript submitted January 13, 2014.

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de Castro, R.S., Pedrosa, I.R.V., Yadava, Y.P. et al. Obtaining an Acicular Microstructure by Thermomechanical Sequences in X-80 Steel. Metall Mater Trans A 45, 4186–4191 (2014). https://doi.org/10.1007/s11661-014-2420-0

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  • DOI: https://doi.org/10.1007/s11661-014-2420-0

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