W-concentration 3D mapping in SKH51 steel by dual-energy kabsorption edge subtraction imaging

Masakazu Kobayashi, Hiroyuki Toda, Akihide Takijiri, Akihisa Takeuchi, Yoshio Suzuki, Kentaro Uesugi

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Abstract

Three-dimensional W-concentration mapping is attempted in a high speed tool steel, SKH51 by applying K-absorption edge subtraction imaging utilizing high energy X-ray in synchrotron radiation facility. Effect of a sample-to-detector distance on spatial resolution had already been reported in high-energy X-ray microtomography. Therefore, effect of the sample-to-detector distance on W-concentration obtained by the Kabsorption edge subtraction imaging has been assessed in this study. A fine CT image was obtained in 65 mm sample-to-detector distance with the influence of both scattering and diffraction on spatial resolution. Although image quality depended on sample-to-detector distance, the distance did not affect Wconcentration measured by the absorption edge subtraction imaging so much, because the effect is limited on object interface. The average W-concentration in whole specimen was consistent with the chemical composition in the SKH51 steel. The maximum W-concentration also agreed with the SEM-EDS result. It was not easy to assess W-concentration on a carbide particle by means of segmentation based on a linear absorption coefficient. The average W-concentration at an aggregated particle, which looks a large coarse particle in CT image, corresponded to the average W-concentration that was estimated based on SEM-EDS. Therefore, it was concluded that W-concentration obtained by K-absorption edge subtraction imaging was accurate. Three-dimensional W-concentration mapping was available in steels by dual-energy K-absorption edge subtraction imaging utilizing high energy X-ray.

Original languageEnglish
Pages (from-to)141-147
Number of pages7
Journalisij international
Volume54
Issue number1
DOIs
Publication statusPublished - Feb 26 2014

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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