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Modulated structure and magnetic properties of age-hardenable Fe-Mn-Al-C alloys

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Abstract

Microstructural changes in the age-hardenable Fe-(30 to 34) wt pct Mn-(8 to 11) wt pct Al-(0.9 to 1.0) wt pct C alloys during aging in the temperature range between 773 and 823 K have been investigated by means of transmission electron microscopy (TEM) and X-ray diffraction. The wavelength of the modulated structure was found to be nearly constant for short aging times and then to increase on further aging, whereas the compositional modulation amplitude was found to increase rapidly from the beginning of aging. The growth of a spinodally modulated structure along the orthogonal «100» directions results in a periodic arrangement of the κ-carbide precipitates, (Fe, Mn)3AlCx, in the austenite matrix. The increases in hardness and residual and saturation inductions in the early stage of aging were in accord with the increase in the amplitude.

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Authors and Affiliations

  1. Analysis Center, Nagaoka University of Technology, Nagaoka, 940-21, Niigata, Japan

    Kazunori Sato (Research Associate) & Yasunobu Inoue (Professor)

  2. Tochigi Research Laboratory, Kao Corporation, 321-34, Tochigi, Japan

    Kazuhiro Tagawa

Authors
  1. Kazunori Sato
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  2. Kazuhiro Tagawa
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  3. Yasunobu Inoue
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Formerly Graduate Student of Mechanical Engineering, Nagaoka University of Technology.

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Sato, K., Tagawa, K. & Inoue, Y. Modulated structure and magnetic properties of age-hardenable Fe-Mn-Al-C alloys. Metall Trans A 21, 5–11 (1990). https://doi.org/10.1007/BF02656419

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  • DOI: https://doi.org/10.1007/BF02656419

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