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Effect of Non-metallic Inclusions in Fe-Al-Ti-O-N-S Alloy on Grain Size

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Abstract

The effect of characteristics of non-metallic inclusions in Fe-Al-Ti-O-N-S alloys with various compositions at 1473 K (1200 °C) on the microstructure was studied. The ASTM grain size number was determined in as-cast and heated samples by the optical microscopy, and the inclusion types in each sample were determined from composition analysis by field-emission scanning electron microscope with energy-dispersive spectroscopy. The TiN-based inclusions certainly had a positive effect on the grain refinement. On the other hand, TiS-based inclusions exhibited no influence on the decrease of grain size. In addition, the formation and evolution behavior of inclusions by heating solid-state Fe-Al-Ti-O-N-S alloys with those locations were clarified. A different change of inclusions in alloys was observed depending on the distribution and composition of inclusions.

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Authors and Affiliations

  1. Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Chiba, 277-8561, Japan

    Wonjin Choi (Ph.D. Student, Postdoctoral Researcher), Hiroyuki Matsuura (Associate Professor) & Fumitaka Tsukihashi (Professor)

  2. School of Advanced Material Engineering, Yonsei University, 262 Seongsanno, Seodaemun-Gu, Seoul, 120-749, South Korea

    Wonjin Choi (Ph.D. Student, Postdoctoral Researcher)

Authors
  1. Wonjin Choi
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  2. Hiroyuki Matsuura
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  3. Fumitaka Tsukihashi
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Correspondence to Hiroyuki Matsuura.

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Manuscript submitted December 30, 2015.

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Choi, W., Matsuura, H. & Tsukihashi, F. Effect of Non-metallic Inclusions in Fe-Al-Ti-O-N-S Alloy on Grain Size. Metall Mater Trans B 47, 1851–1857 (2016). https://doi.org/10.1007/s11663-016-0617-x

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  • DOI: https://doi.org/10.1007/s11663-016-0617-x

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