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ω-Fe particle size and distribution in high-nitrogen martensitic steels

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Abstract

Systematical transmission electron microscopy (TEM) studies of the martensitic substructure in quenched Fe–C binary alloys have revealed that the initially formed martensite has twinning structure, and the twin is body-centered cubic {112}<111>-type twin regardless of the carbon concentrations. A metastable hexagonal ω-Fe(C) phase with an ultrafine particle-like morphology is distributed at the twin boundary region. In order to explore the common existence of the ω-Fe in nitrogen steels, the martensitic substructures in high-nitrogen martensitic stainless steels at various conditions (as-quenched, subzero-treated and tempered) have been investigated in detail by means of TEM. The ω-Fe with an ultrafine particle size of 1–3 nm has been observed in all the samples. TEM tilting experiment and electron diffraction analysis have revealed that each martensitic lath or plate is composed of {112}<111>-type twin structure with the ω particles at the twin boundary region. The martensite morphology and the relationship between the twin and the ω phase particles have been discussed crystal geometrically. The ω particle size variation with subzero and tempering treatment has also been discussed based on a proposed dilation and split mechanism. The existence of large amount of twins up to 550 °C simply suggests that the nitrogen atoms have much stronger effect than carbon atoms on the ω phase stability. The present investigation will provide a very clear image about the martensitic substructure in high-nitrogen martensitic stainless steels.

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Acknowledgements

The authors would like to gratefully acknowledge Dr. S. Ueta in Daido Steel Co., Ltd., for providing the high-nitrogen-containing steel studied in the present work. This work was supported by JSPS KAKENHI Grant number JP15H02304.

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  1. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan

    D. H. Ping

  2. Faculty of Engineering, Hokkaido University, Kita 13 Nishi8, Kita-ku, Sapporo, Hokkaido, 060-8628, Japan

    M. Ohnuma

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Ping, D.H., Ohnuma, M. ω-Fe particle size and distribution in high-nitrogen martensitic steels. J Mater Sci 53, 5339–5355 (2018). https://doi.org/10.1007/s10853-017-1938-0

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