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Orientation Relationships and Texture of the Iron-Nitride Phase Constituents in Pulsed Plasma Nitriding

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Abstract

Electron backscattered diffraction study was used to determine the preferred orientations of the crystals and texture evolution as a consequence of nitrogen diffusion. In the current study, the nitrided layer on a steel substrate was selected as a model material to investigate the distribution of different phases as well as their crystallographic relationships. Possible phase orientation relationships between the constituents were found based on which a phase transformation mechanism was proposed. The investigation of coincidence site lattice revealed that Σ9 and Σ25 types of grain boundaries are separating the elongated ε-phase grains. It was also presented how the phase constituents’ distribution affects the mechanical properties using nanomechanical indentation technique. Moreover, it was found that the ε-phase exists in three distinguished orientations across the matrix each of which representing a definite phase transformation phenomenon.

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Acknowledgments

The authors would like to thank senior engineer Mr. Wilhelm Dall for fruitful discussions. The results presented in the current article were generated as part of the JIP “Pulsed plasma surface treatment (PPST)—effect on hydrogen embrittlement and hydrogen absorption and diffusion” executed by the Department of Engineering Science and Materials, NTNU, with financial and technical supports from Total E&P Norge, Aker Solutions and Motech plasma Material and Overflateknologi (MOTecH). MOTecH is the owner of the applied PPST process and delivered all the project’s treated samples. The authors would like to thank all of the participating companies for their technical support and for permission to publish the results from the JIP. Mr. Bård Nyhus is gratefully appreciated for man-hours allowance of the corresponding author.

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Authors and Affiliations

  1. Department of Engineering Design and Materials, NTNU, Trondheim, Norway

    Masoud Asgari (Ph.D. Candidate), Afrooz Barnoush (Researcher) & Roy Johnsen (Professor)

  2. Department of Materials Science, Saarland University, Saarbruecken, Germany

    Afrooz Barnoush (Researcher)

  3. Department of Materials and Chemistry, SINTEF, Forskningsveien 1, 0314, Olso, Norway

    Amin S. Azar (Research Scientist)

Authors
  1. Masoud Asgari
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  2. Amin S. Azar
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  3. Afrooz Barnoush
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  4. Roy Johnsen
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Corresponding author

Correspondence to Amin S. Azar.

Additional information

Manuscript submitted January 11, 2013.

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Asgari, M., Azar, A.S., Barnoush, A. et al. Orientation Relationships and Texture of the Iron-Nitride Phase Constituents in Pulsed Plasma Nitriding. Metall Mater Trans A 44, 4700–4708 (2013). https://doi.org/10.1007/s11661-013-1830-8

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