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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >
Visualising Martensite Phase Fraction in Bulk Ferrite Steel by Superimposed Bragg-edge Profile Analysis of Wavelength resolved Neutron Transmission Imaging
| Title: | Visualising Martensite Phase Fraction in Bulk Ferrite Steel by Superimposed Bragg-edge Profile Analysis of Wavelength resolved Neutron Transmission Imaging |
| Authors: | Sato, Hirotaka Browse this author | | Kusumi, Atsuya Browse this author | | Shiota, Yoshinori Browse this author | | Hayashida, Hirotoshi Browse this author | | Su, Yuhua Browse this author | | Parker, Joseph Don Browse this author | | Watanabe, Kenichi Browse this author | | Kamiyama, Takashi Browse this author →KAKEN DB | | Kiyanagi, Yoshiaki Browse this author →KAKEN DB |
| Keywords: | superimposed Bragg-edge | | crystalline phase fraction | | ferrite | | martensite | | Bragg-edge neutron transmission imaging | | tomography |
| Issue Date: | 15-Nov-2022 |
| Publisher: | 一般社団法人 日本鉄鋼協会 (The Iron and Steel Institute of Japan) |
| Journal Title: | ISIJ international |
| Volume: | 62 |
| Issue: | 11 |
| Start Page: | 2319 |
| End Page: | 2330 |
| Publisher DOI: | 10.2355/isijinternational.ISIJINT-2022-197 |
| Abstract: | Bragg-edge neutron transmission imaging, a wavelength-resolved neutron imaging method, is a unique method for materials characterization. This method can quantitatively visualise various crystalline microstructural information in bulk material over several- centimetres with sub-millimetre spatial resolution. In various forms of crystalline information, the martensite phase fraction in ferritic steel is significant for the characterisation of, e.g., contact surface of an induction-hardened gear, dual phase (DP) steel used for automobiles, and the cutting edge of Japanese swords. However, the martensite phase fraction in a ferrite-martensite steel has not been measured using conventional Bragg-edge analysis methods because the entire neutron transmission spectral pattern of the alpha'- martensite phase corresponds to that of the alpha- ferrite phase. However, the Bragg-edge profile of the martensite phase is slightly broader than that of the ferrite phase. For these reasons, we developed a new method for measuring the ferrite/martensite phase fraction from the superimposed Bragg-edge (sBE) profile composed of both sharp alpha{110} Bragg-edge and broad asymmetric a'{110}- a'{101} Bragg-edge. As a result, two-dimensional imaging and computed tomography of the martensite phase fraction in ferrite-martensite steel were reasonably achieved. In addition, we observed the sBE analysis method to have numerous advantages such as reasonable accuracy (similar to 5%), high precision and stability, and easy handling. Furthermore, we identified the suitability of an asymmetric crystal-latticeplane-spacing distribution function for the determination of the alpha'{110}- alpha'{101} Bragg-edge profile, and found the blurred boundary by mixing unquenched and quenched regions in an induction-hardened steel rod. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/88535 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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