HUSCAP logo Hokkaido Univ. logo

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

Files in This Item:

The file(s) associated with this item can be obtained from the following URL:

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
Bragg-edge neutron transmission imaging
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
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)

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University