52PP22--1177 PP22--1177 In Situ Neutron Diffraction Study on Deformation Behavior of Hydrogen-charged SUS310S Austenitic Steel In Situ Neutron Diffraction Study on Deformation Behavior of Hydrogen-charged SUS310S Austenitic Steel T. Ito 1, Y. Ogawa 2, 1 J-PARC Center, Japan Atomic Energy Agency (JAEA) T. Ito 1, Y. Ogawa 2, 2 Research Center for Structural Materials, National Institute for Materials Science (NIMS) 1 J-PARC Center, Japan Atomic Energy Agency (JAEA) 2 Research Center for Structural Materials, National Institute for Materials Science (NIMS) Hydrogen is being considered as an alternative energy carrier to fossil fuels to achieve the goal of "Carbon Neutrality". While hydrogen has historically been associated with causing steel embrittlement, Hydrogen is being considered as an alternative energy carrier to fossil fuels to achieve the goal of Ogawa et al. reported that the introduction of hydrogen to SUS310S (Fe-24Cr-19Ni (mass%)) enhances "Carbon Neutrality". While hydrogen has historically been associated with causing steel embrittlement, both strength and ductility, thus counteracts the embrittlement effect [1]. Although this phenomenon was Ogawa et al. reported that the introduction of hydrogen to SUS310S (Fe-24Cr-19Ni (mass%)) enhances qualitatively explained by the hydrogen-induced solid-solution strengthening and the promotion of both strength and ductility, thus counteracts the embrittlement effect [1]. Although this phenomenon was deformation twinning, the influence of hydrogen on the development of dislocations and stacking fault qualitatively explained by the hydrogen-induced solid-solution strengthening and the promotion of (i.e., twin nuclei) during deformation remains less understood. The aim of this work is to investigate the deformation twinning, the influence of hydrogen on the development of dislocations and stacking fault effects of hydrogen on the evolution of these crystal defects by using in situ neutron diffraction (i.e., twin nuclei) during deformation remains less understood. The aim of this work is to investigate the measurements. A SUS310S specimen was exposed to a hydrogen gas environment at 100 MPa and 270 effects of hydrogen on the evolution of these crystal defects by using in situ neutron diffraction ˚C for 200 hours, with a uniformly pre-charged hydrogen concentration of 140 mass ppm. In situ neutron measurements. A SUS310S specimen was exposed to a hydrogen gas environment at 100 MPa and 270 diffraction measurements at room temperature were conducted by the engineering neutron ˚C for 200 hours, with a uniformly pre-charged hydrogen concentration of 140 mass ppm. In situ neutron diffractometer TAKUMI at MLF of J-PARC. When comparing the analysis results of neutron diffraction diffraction measurements at room temperature were conducted by the engineering neutron patterns for hydrogen-charged and non-charged samples, the difference of stacking fault probability was When comparing the analysis results of neutron diffraction diffractometer TAKUMI at MLF of J-PARC. hardly observed although hydrogen is generally considered to reduce the stacking fault energy [2]. The patterns for hydrogen-charged and non-charged samples, the difference of stacking fault probability was dislocation density was determined through CMWP analysis, and the increase of dislocation density due hardly observed although hydrogen is generally considered to reduce the stacking fault energy [2]. The to hydrogen under a given strain was verified. This study got support from MEXT Program dislocation density was determined through CMWP analysis, and the increase of dislocation density due (JPMXP1122684766) and Grant-in-Aid for Research Activity Start-up (JP23K19189). to hydrogen under a given strain was verified. This study got support from MEXT Program Whiteman et al., Phys. Status Solidi, 7 (1964) 109 [1] Y. Ogawa et al., Acta Mater., 199 (2020) 181 [2] (JPMXP1122684766) and Grant-in-Aid for Research Activity Start-up (JP23K19189). [1] Y. Ogawa et al., Acta Mater., 199 (2020) 181 [2] Advanced FIB-SE Advanced FIB-SET. Hara, A. Shibata and H. Nishikawa Research Center for Structural Materials, National Institute for Materials Science (NIMS) T. Hara, A. Shibata and H. Nishikawa Research Center for Structural Materials, National Institute for Materials Science (NIMS) Recently, higher spatial resolution and larger observation volume have been required for FIB-SEM serial sectioning observation. For the former purpose, higher resolution, we have developed and applied an Recently, higher spatial resolution and larger observation volume have been required for FIB-SEM serial orthogonal arranged FIB-SEM. Since this arrangement is ideal for the serial-sectioning, higher sectioning observation. For the former purpose, higher resolution, we have developed and applied an resolution, contrast, and stability are simultaneously realized. For the latter requirement, larger volume, orthogonal arranged FIB-SEM. Since this arrangement is ideal for the serial-sectioning, higher we introduced the Plasma FIB(PFIB)-SEM-femtosecond Laser tri-beam system. resolution, contrast, and stability are simultaneously realized. For the latter requirement, larger volume, Several results applying these FIB-SEMs will be introduced in this poster: we introduced the Plasma FIB(PFIB)-SEM-femtosecond Laser tri-beam system. 1. 3D-EBSD by the orthogonal FIB-SEM: Orthogonal FIB-SEM has an advantage in obtaining 3D-Several results applying these FIB-SEMs will be introduced in this poster: EBSD. This equipment realizes a ‘pure’ static arrangement for the serial sectioning EBSD. Since there 1. 3D-EBSD by the orthogonal FIB-SEM: Orthogonal FIB-SEM has an advantage in obtaining 3D-is no need to move the sample stage during observation, high stability measurement in a shorter time EBSD. This equipment realizes a ‘pure’ static arrangement for the serial sectioning EBSD. Since there can be achieved. We applied this feature for the 3D-EBSD analysis around a crack tip in high-strength is no need to move the sample stage during observation, high stability measurement in a shorter time steel to understand the relationship between the crack propagation and the microstructure. We applied this feature for the 3D-EBSD analysis around a crack tip in high-strength can be achieved. 2. PFIB-SEM for more extensive volume observation: We often need a larger volume 3D observation, steel to understand the relationship between the crack propagation and the microstructure. which the standard Ga-FIB cannot reach. Xe PFIB is utilized in such cases. We performed 3D-EBSD, We often need a larger volume 3D observation, 2. PFIB-SEM for more extensive volume observation: SIM, and SEM microstructural observations of whole micro fatigue cracks in Ni-Co base superalloy which the standard Ga-FIB cannot reach. Xe PFIB is utilized in such cases. We performed 3D-EBSD, over 200um widths. From this observation, we can analyze the crack propagation mechanism in detail. SIM, and SEM microstructural observations of whole micro fatigue cracks in Ni-Co base superalloy In the poster presentation, we would like to present such measurement techniques, including these over 200um widths. From this observation, we can analyze the crack propagation mechanism in detail. applications. In the poster presentation, we would like to present such measurement techniques, including these applications. References 1. T. Hara, K. Tsuchiya, K. Tsuzaki, X. Man, T. Asahata, A. Uemoto, J. Alloys and Compounds, 577, S717-721, (2013) References 2. A. Shibata, I. Gutierrez-Urrutia, A. Nakamura, G. Miyamoto, Y. Madi, J. Besson, T. Hara, K. Tsuzaki, Acta Mater., 234, 1. T. Hara, K. Tsuchiya, K. Tsuzaki, X. Man, T. Asahata, A. Uemoto, J. Alloys and Compounds, 577, S717-721, (2013) 118053 (2022) 2. A. Shibata, I. Gutierrez-Urrutia, A. Nakamura, G. Miyamoto, Y. Madi, J. Besson, T. Hara, K. Tsuzaki, Acta Mater., 234, 3. H. Nishikawa, Y. Furuya, T. Osada, K. Kawagishi, T. Hara, Scripta Mater., 222, 115026 (2023) 118053 (2022) 3. H. Nishikawa, Y. Furuya, T. Osada, K. Kawagishi, T. Hara, Scripta Mater., 222, 115026 (2023) PP22--1188 PP22--1188 W. Gong 1, W. Mao 1, T. Kawasaki 1, K. Okada 2, A. Shibata 2 and S. Harjo 1 W. Gong 1, W. Mao 1, T. Kawasaki 1, K. Okada 2, A. Shibata 2 and S. Harjo 1 M Serial-Sectioning Techniques Dedicated for 3D-EBSD Analysis M Serial-Sectioning Techniques Dedicated for 3D-EBSD Analysis Poster Presentation ｜NIMS Award Symposium 2023M. B. M. B. Whiteman et al., Phys. Status Solidi, 7 (1964) 109 P2 ｜ Characterization
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