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Laser nitriding of iron: Nitrogen profiles and phases

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Abstract

Armco iron samples were surface nitrided by irradiating them with pulses of an excimer laser in a nitrogen atmosphere. The resulting nitrogen depth profiles measured by Resonant Nuclear Reaction Analysis (RNRA) and the phase formation determined by Conversion Electron Mössbauer Spectroscopy (CEMS) were investigated as functions of energy density and the number of pulses. The nitrogen content of the samples was found to be independent of the number of pulses in a layer of 50 nm from the surface and to increase in depths exceeding 150 nm. The phase composition did not change with the number of pulses. The nitrogen content can be related to an enhanced nitrogen solubility based on high temperatures and high pressures due to the laser-induced plasma above the sample. With increasing pulse energy density, the phase composition changes towards phases with higher nitrogen contents. Nitrogen diffusion seems to be the limiting factor for the nitriding process.

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Authors and Affiliations

  1. Physikalisches Institut, Universität Göttingen, Bunsenstrasse 7-9, D-37073, Göttingen, Germany

    C. Illgner, P. Schaaf & K. P. Lieb

  2. Applikations- und Technikzentrum EVUS, Rinostrasse 1, D-92249, Vilseck, Germany

    E. Schubert, R. Queitsch & H. -W. Bergmann

Authors
  1. C. Illgner
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  2. P. Schaaf
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  3. K. P. Lieb
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  4. E. Schubert
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  5. R. Queitsch
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  6. H. -W. Bergmann
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Illgner, C., Schaaf, P., Lieb, K.P. et al. Laser nitriding of iron: Nitrogen profiles and phases. Appl. Phys. A 61, 1–5 (1995). https://doi.org/10.1007/BF01538202

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