PSI - Issue 43

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

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Procedia Structural Integrity 43 (2023) 221–227

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. © 20 23 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. Abstract Auste itic stainless steel (JIS-SUS304L) with a bimodal harmonic structure, which is defin d as coarse-grained structure urrounded by a network of f e grains, was developed by powder metallurgy to improve bo h strength and ductility. In the present study, three-dime sional grain mappin for poly rystalli e m terials, called X-ray diffraction contrast t mography (DCT), was conducted at SPring-8, which is the brightest synchrotron radiation facility in Japa , to eluc dat the deformation m chanism of armonic structured JIS-SUS304L in tension. The ave age total misorientation tended to increase with stress in tensile tests; wev r, the total m sorientation of the har onic structured JIS-SUS304L w s lower than that f JIS-SUS304L with a homogeneous distribution of coarse grains at comparable stress. Furthermore, the change in the crosssectio al area of th harmonic structured JIS-SUS304L was also measured by refraction contrast tomography (RCT) imaging using SPring-8 in tensile tests. © 20 23 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. 10th International Conference on Materials Structure and Micromechanics of Fracture Misorientation Measurement in Tensile Test of Bimodal Harmonic Structured Stainless Steel by Diffraction Contrast Tomography Using Ultrabright Synchrotron Radiation X-ray Yoshikazu Nakai a,b,* , Shoichi Kikuchi c , Daiki Shiozawa a , Issei Nakazawa a , Keisuke Fujita b , Mie O. Kawabata d and Kei Ameyama d a Department of Mechanical Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan b Graduate School of Science and Technologyg, Shizuoka University, 3-5-1 Johoku, Naka, Hamamatsu 432-8561, Japan c Department of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku, Naka, Hamamatsu 432-8561, Japan d Department of Mechanical Engineering, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu 525-8577, Japan Abstract Austenitic stainless steel (JIS-SUS304L) with a bimodal harmonic structure, which is defined as a coarse-grained structure surrounded by a network of fine grains, was developed by powder metallurgy to improve both strength and ductility. In the present study, three-dimensional grain mapping for polycrystalline materials, called X-ray diffraction contrast tomography (DCT), was conducted at SPring-8, which is the brightest synchrotron radiation facility in Japan, to elucidate the deformation mechanism of harmonic structured JIS-SUS304L in tension. The average total misorientation tended to increase with stress in tensile tests; however, the total misorientation of the harmonic structured JIS-SUS304L was lower than that of JIS-SUS304L with a homogeneous distribution of coarse grains at comparable stress. Furthermore, the change in the crosssectional area of the harmonic structured JIS-SUS304L was also measured by refraction contrast tomography (RCT) imaging using SPring-8 in tensile tests. 10th International Conference on Materials Structure and Micromechanics of Fracture Misorientation Measurement in Tensile Test of Bimodal Harmonic Structured Stainless Steel by Diffraction Contrast Tomography Using Ultrabright Synchrotron Radiation X-ray Yoshikazu Nakai a,b,* , Shoichi Kikuchi c , Daiki Shiozawa a , Issei Nakazawa a , Keisuke Fujita b , Mie O. Kawabata d and Kei Ameyama d a Department of Me h ical Engineering, Kobe University, 1-1 Rokk dai, Nada, Kobe 657-8501, Japan b Gradu te Scho l of S ie ce nd Technolo yg, Shizuoka University, 3-5-1 J hoku, N ka, H matsu 432-8561, J pan c epartment of Mechanical Engine ring, Sh z oka U iversity, 3-5- Johoku, Nak , Hamamatsu 432-8561, Japan d Department of Mechanical Engineering, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu 525-8577, Japan Keywords: Harmonic structure; Diffraction contrast tomography; Refraction contrast tomography; Ultrabright synchrotron radiation Keywords: Harmonic structure; Diffraction contrast tomography; Refraction contrast tomography; Ultrabright synchrotron radiation

*Corresponding author. Tel.: +81-78-881-1212; fax: +81-78-803-6155. E-mail address: nakai@mech.kobe-u.ac.jp *Correspon ing author. Tel.: +81-78-881-1212; fax: +81-78-803-6155. E-mail address: nakai@mech.kobe-u.ac.jp

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 10.1016/j.prostr.2022.12.262 2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers.