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Simultaneous Broadening Analysis of Multiple Bragg Edges Observed by Wavelength-resolved Neutron Transmission Imaging of Deformed Low-carbon Ferritic Steel
| Title: | Simultaneous Broadening Analysis of Multiple Bragg Edges Observed by Wavelength-resolved Neutron Transmission Imaging of Deformed Low-carbon Ferritic Steel |
| Authors: | Sato, Hirotaka Browse this author | | Iwase, Kenji Browse this author | | Kamiyama, Takashi Browse this author →KAKEN DB | | Kiyanagi, Yoshiaki Browse this author →KAKEN DB |
| Keywords: | pulsed neutron transmission imaging | | multiple Bragg-edges broadening analysis | | corrected classical Williamson-Hall method | | micro-strain | | dislocation density | | crystallite size |
| Issue Date: | 15-Jun-2020 |
| 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: | 60 |
| Issue: | 6 |
| Start Page: | 1254 |
| End Page: | 1263 |
| Publisher DOI: | 10.2355/isijinternational.ISIJINT-2019-656 |
| Abstract: | With the goal of real-space mapping of dislocation information using a wavelength-resolved (spectroscopic) neutron transmission imaging method, broadenings of multiple Bragg-edges in neutron transmission spectrum were investigated in detail for the first time. Data of time-of-flight (TOF) neutron transmission imaging and diffraction experiments on a polycrystalline low-carbon ferritic steel sample while undergoing tensile testing were analysed. The Bragg-edge neutron transmission spectroscopy was combined with the classical Williamson-Hall method corrected by the crystal elastic anisotropy using the ratio of diffraction Young's modulus, namely, the corrected classical Williamson-Hall (ccWH) method. As a result, the broadening values evaluated from the ccWH analysis of Bragg-edge data were consistent with results of both our TOF neutron diffraction experiments and previous reports. In addition, it was deduced that the line-broadenings appearing in the plastic deformation condition during tensile testing in our experiment were mainly caused by micro-strain (dislocation density) effect and not by crystallite size effect. Finally, a Bragg-edge broadening mapping method, using a simultaneous multiple Bragg-edges profile analysis based on the ccWH method, could identify plastically deformed zones in the sample more clearly than a traditional single Bragg-edge broadening analysis method. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/79906 |
| 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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