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In Situ Observation for Abnormal Grain Coarsening in Vacuum-Carburizing Process

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Abstract

An in situ observation method was developed to investigate abnormal grain coarsening which occurs around the surface of steel during the vacuum-carburizing process. In this method, diffusion of carbon atoms in the vacuum carburizing was simulated by a cementite and steel diffusion couple. Abnormal grain coarsening, which appeared around the cementite and steel interface, was observed by a confocal scanning laser microscope. With this method, it was observed that when holding time was 60 seconds, the temperature at which the abnormal grain coarsening appeared in a specimen was higher when carburized than the temperature when not carburized. On the contrary, when holding time was 120 seconds, the temperature at which the abnormal grain coarsening appeared in a specimen was 10 K to 20 K lower than that in a non-carburized specimen. The validity of the observed results was confirmed by the calculated NbC fraction using Nb solubility and measured carbon content.

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Authors and Affiliations

  1. Toyota Central R&D Labs., Inc., 41-1, Yokomichi, Nagakute, Aichi, 480-1192, Japan

    Yasuhiro Yogo (Researcher) & Kouji Tanaka (Researcher)

Authors
  1. Yasuhiro Yogo
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  2. Kouji Tanaka
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Correspondence to Yasuhiro Yogo.

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Manuscript submitted July 1, 2013.

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Yogo, Y., Tanaka, K. In Situ Observation for Abnormal Grain Coarsening in Vacuum-Carburizing Process. Metall Mater Trans A 45, 2834–2841 (2014). https://doi.org/10.1007/s11661-014-2233-1

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  • DOI: https://doi.org/10.1007/s11661-014-2233-1

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