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Effect of Different Thermomechanical Processes on the Microstructure, Texture, and Mechanical Properties of API 5L X70 Steel

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Abstract

A commercial API 5L X70 steel plate was subjected to different thermomechanical processes to propose a novel thermomechanical rolling path to achieve improved mechanical properties. Scanning electron microscopy, electron backscatter diffraction, and x-ray texture analysis were employed for microstructural characterization. The results showed that strain-free recrystallized {001} ferrite grains that developed at higher rolling temperature could not meet the American Petroleum Institute (API) requirements. Also, refined and work-hardened grains that have formed in the intercritical region with high stored energy do not provide suitable tensile properties. However, fine martensite–austenite constituents dispersed in ferrite matrix with grains having predominantly {111} and {110} orientations parallel to the normal direction that developed under isothermal rolling at 850 °C provided an outstanding combination of tensile strength and ductility.

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Acknowledgments

The authors acknowledge the CAPES and CNPq Brazilian research agencies for financial support and Central Analítica-UFC/CT-INFRA/MCTI-SISNANO/Pró-Equipamentos for providing research facilities used in this work.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, University of São Paulo, Av. Prof. Mello Moraes, 2463, São Paulo, SP, CEP: 05508-030, Brazil

    Mohammad Masoumi & Edwan Anderson Ariza Echeverri

  2. Department of Metallurgical and Materials Engineering, Federal University of Ceará, Campus do Pici, 729, Fortaleza, CE, CEP: 60440-554, Brazil

    Mohammad Masoumi, Cleiton Carvalho Silva, Miloslav Béreš & Hamilton Ferreira Gomes de Abreu

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  1. Mohammad Masoumi
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Correspondence to Mohammad Masoumi.

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Masoumi, M., Echeverri, E.A.A., Silva, C.C. et al. Effect of Different Thermomechanical Processes on the Microstructure, Texture, and Mechanical Properties of API 5L X70 Steel. J. of Materi Eng and Perform 27, 1694–1705 (2018). https://doi.org/10.1007/s11665-018-3276-z

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  • DOI: https://doi.org/10.1007/s11665-018-3276-z

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