Characterization of Manganese Oxide-Enriched Surface Layers of Fe-Mn Alloys

Author:

Shinoda Kozo1,Yamamoto Takamichi1,Suzuki Shigeru1,Uruga Tomoya2,Tanida Hajime2,Toyokawa Hidenori2,Terada Yasuko2,Takagaki Yasufumi2

Affiliation:

1. Tohoku University

2. Japan Synchrotron Radiation Research Institute (JASRI)

Abstract

Alloying elements are added to steel for improving surface properties such as corrosion resistance. The alloying elements exhibit different chemical characters, and they are often enriched to the surface of the alloys during annealing at high temperatures. In this study, depth-resolved X-ray absorption spectroscopy (XAS) measurements were carried out using a two-dimensional detector with geometrical arrangement of grazing exit in detection of fluorescence X-ray emitted from sample surface, in order to characterize the enrichment and oxidation of manganese on the surface layers of an Fe-Mn alloy annealed under low oxygen partial pressure. This technique facilitates non-destructive measurement for characterizing the compositional distribution of manganese in the depth direction. The results showed that manganese was enriched to surface layers of the Fe-Mn alloys during annealing at high temperatures and formed as manganese oxide. The preferential oxidation of manganese by annealing under low oxygen partial pressure is considered the driving force for their enrichment on the alloy surface.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference7 articles.

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2. Y. N. Chang and F. I. Wei, J. Mater. Sci. Vol. 24 (1989), p.14.

3. X. V. Eynde, J. -P. Servais and M. Lamberigts, Surf. Interface Anal. Vol. 33 (2002), p.322.

4. T. Yamamoto, K. Shinoda and S. Suzuki, to be published.

5. O. Knacke, O. Kubaschewski and K. Hesselmann, Thermochemical Properties of Inorganic Substances, 2nd ed., Verlag Stahleisen (1991).

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