The Experts below are selected from a list of 13998 Experts worldwide ranked by ideXlab platform
Kaneaki Tsuzaki - One of the best experts on this subject based on the ideXlab platform.
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hydrogen induced cracking at grain and twin boundaries in an fe mn c austenitic steel
Scripta Materialia, 2012Co-Authors: Dierk Raabe, Motomichi Koyama, Kaneaki Tsuzaki, Eiji Akiyama, Takahiro SawaguchiAbstract:Hydrogen embrittlement was observed in an Fe–18Mn–1.2C (wt.%) steel. The tensile ductility was drastically reduced by hydrogen charging during tensile testing. The fracture mode was mainly intergranular fracture, though transgranular fracture was also partially observed. The transgranular fracture occurred parallel to the primary and secondary deformation twin boundaries, as confirmed by Electron Backscattering diffraction analysis and orientation-optimized Electron channeling contrast imaging. The microstructural observations indicate that cracks are initiated at grain boundaries and twin boundaries.
Tadashi Furuhara - One of the best experts on this subject based on the ideXlab platform.
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analysis of recrystallization behavior of hot deformed austenite reconstructed from Electron Backscattering diffraction orientation maps of lath martensite
Scripta Materialia, 2016Co-Authors: Manabu Kubota, Goro Miyamoto, Kohsaku Ushioda, Tadashi FuruharaAbstract:Abstract The recrystallization behavior of hot-deformed austenite of a 0.55% C steel at 800 °C was investigated by a method of reconstructing the parent austenite orientation map from an Electron Backscattering diffraction orientation map of lath martensite. Recrystallized austenite grains were clearly distinguished from un-recrystallized austenite grains. Very good correlation was confirmed between the static recrystallization behavior investigated mechanically by double-hit compression tests and the change in austenite microstructure evaluated by the reconstruction method. The recrystallization behavior of hot-deformed 0.55% C steel at 800 °C is directly revealed and it was observed that by addition of 0.1% V the recrystallization was significantly retarded.
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effects of α γ orientation relationship on vc interphase precipitation in low carbon steels
Scripta Materialia, 2013Co-Authors: Yongjie Zhang, Kunio Shinbo, Goro Miyamoto, Tadashi FuruharaAbstract:The effects of the ferrite/austenite orientation relationship (OR) on interphase precipitation in Fe–0.1C–1.5Mn–0.4V (mass%) alloy were investigated by using Electron Backscattering diffraction and three-dimensional atom probe. VC interphase precipitation in both sheet-like and random dispersions is obtained in ferrite without a near Kurdjumov–Sachs (K-S) OR with adjacent austenite into which the ferrite grows, while the number density of VC in ferrite with a K-S OR is far lower, indicating that a large deviation from the K-S OR is necessary for interphase precipitation in low-carbon steels.
Motomichi Koyama - One of the best experts on this subject based on the ideXlab platform.
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hydrogen induced cracking at grain and twin boundaries in an fe mn c austenitic steel
Scripta Materialia, 2012Co-Authors: Dierk Raabe, Motomichi Koyama, Kaneaki Tsuzaki, Eiji Akiyama, Takahiro SawaguchiAbstract:Hydrogen embrittlement was observed in an Fe–18Mn–1.2C (wt.%) steel. The tensile ductility was drastically reduced by hydrogen charging during tensile testing. The fracture mode was mainly intergranular fracture, though transgranular fracture was also partially observed. The transgranular fracture occurred parallel to the primary and secondary deformation twin boundaries, as confirmed by Electron Backscattering diffraction analysis and orientation-optimized Electron channeling contrast imaging. The microstructural observations indicate that cracks are initiated at grain boundaries and twin boundaries.
B P Wynne - One of the best experts on this subject based on the ideXlab platform.
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Electron Backscattering diffraction analysis of mechanically milled and spark plasma sintered pure aluminium
Scripta Materialia, 2007Co-Authors: Masahiro Kubota, B P WynneAbstract:Analysis of the spark plasma sintering (SPS) microstructures fabricated from 8 h mechanically milled (MMed) pure aluminium powder was undertaken via orientation image maps (OIMs) obtained via the Electron Backscattering diffraction (EBSD) technique. EBSD analysis clearly revealed that the SPS material possessed a mixture of fine grains approximately 300 nm in diameter and coarse grains 2–5 μm in size. This bimodal aluminium matrix grain structure exhibited the crystallographically random textures and grain boundary misorientations that are virtually all high angle (>15°).
Yo Tomota - One of the best experts on this subject based on the ideXlab platform.
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stress partitioning behavior in an fcc alloy evaluated by the in situ ex situ ebsd wilkinson method
Acta Materialia, 2011Co-Authors: Mayumi Ojima, Yoshitaka Adachi, Seiichi Suzuki, Yo TomotaAbstract:Hierarchical stress partitioning behavior among grains in the elasto-plastic region of a polycrystalline material was studied by a combined technique of in situ/ex situ Electron Backscattering diffraction based on local strain measurements (the EBSD-Wilkinson method) and neutron diffraction measurements during tensile deformation. Elastic strains parallel to the tensile direction both during loading (e11) and after unloading (e′11) were measured. The volume-averaged stress partitioning among [hkl] family grains measured by the EBSD-Wilkinson method was in good agreement with that measured by neutron diffraction measurements, but a more complicated strain distribution occurred microscopically because of restriction from the surrounding grains.
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work hardening mechanism in high nitrogen austenitic steel studied by in situ neutron diffraction and in situ Electron Backscattering diffraction
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2009Co-Authors: M Ojima, Yoshitaka Adachi, Yo Tomota, K Ikeda, Takashi Kamiyama, Yasuyuki KatadaAbstract:With a focus on microstructural hierarchy, work hardening behaviour in high nitrogen-bearing austenitic steel (HNS) was investigated mainly by a combined technique of in situ neutron diffraction and in situ Electron Backscattering diffraction (EBSD). Stress partitioning due to difference in deformability among grains is enhanced in HNS. The larger stress partitioning among [h k l]-oriented family grains seems to realize high work hardening at a small strain. At a larger strain, dislocation density is higher in HNS than in low nitrogen austenitic steel (LNS), which is a possible reason for high work hardening after straining proceeds, resulting in large uniform elongation.