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Effects of continuous cooling rate on morphology of granular bainite in pipeline steels

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Abstract

The morphology and characteristics of granular bainite (GB) in pipeline steels at different continuous cooling rates were investigated by scanning electron microscopy, transmission electron microscopy and electron back-scattered diffraction (EBSD). The results show that the morphology of ferrite matrix in GB turned from the lath sheaf structure into the nearly equiaxed large grain with the cooling rate decreasing from high (60 °C/s) to low (5–10 °C/s). At the medium cooling rate (20–40 °C/s), GB consisted of the irregular ferrite matrix, the granular martensite/austenite (M/A) constituents and abundant substructures inside. The formation of the irregular ferrite and substructure was attributed to the high-temperature recovery which occurred at relatively high-temperature stage before phase transformation. The granular morphology of M/A constituents was formed from the carbon-rich triple junctions which were produced by the multidirectional substructure interfaces converged with each other. Particularly, some martensite in M/A constituents was misoriented from the adjacent ferrite by very small misorientation angle, which could be characterized by the mean band contrast function of EBSD qualitatively or semiquantitatively.

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Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (No. 2017YFB0304900).

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Authors and Affiliations

  1. Department of Structural Steels, Central Iron and Steel Research Institute, Beijing, 100081, China

    Shu-jun Jia, Ba Li & Qing-you Liu

  2. State Key Laboratory of Metal Material for Marine Equipment and Application of Iron and Steel Research Institutes of Ansteel Group Corporation, Anshan, 114009, Liaoning, China

    Yi Ren, Shuai Zhang & Hong Gao

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  1. Shu-jun Jia
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  2. Ba Li
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  3. Qing-you Liu
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  4. Yi Ren
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Correspondence to Ba Li.

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Jia, Sj., Li, B., Liu, Qy. et al. Effects of continuous cooling rate on morphology of granular bainite in pipeline steels. J. Iron Steel Res. Int. 27, 681–690 (2020). https://doi.org/10.1007/s42243-019-00346-3

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  • DOI: https://doi.org/10.1007/s42243-019-00346-3

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