Shohei Ueki

Nanolamellar hybrid high-entropy alloys with superior micromechanical properties

Shivam Dangwal, Yoji Mine, Shohei Ueki, Xavier Sauvage et autres

jp, fr (code pays fourni par la source)

Improving the High-Temperature Mechanical Properties of L-PBF CM247LC Through HIPing and Aging Treatments

Suyalatu, Kazuto Arakawa, Hideki Wakabayashi, Shohei Ueki et autres

Abstract CM247LC was fabricated using L-PBF with optimized build parameters to minimize cracking. This paper explores the potential for using HIPing, followed directly by aging heat treatments, to optimize tensile and creep properties while reducing the number of heat treatments and the …

jp, gb (code pays fourni par la source)

Effect of Microstructural Heterogeneity on Fatigue Limit of As-quenched Low-carbon Low-alloy Martensitic Steel

Shohei Ueki, Toshiyuki KONDO, Shigeru Hamada

Fatigue crack initiation and subsequent crack propagation behaviour in as-quenched low-carbon low-alloy steel were examined using a rotating-bending fatigue test and electron backscatter diffraction analysis to clarify the relationship between the fatigue limit and the microstructural heterogeneity of martensite. The as-quenched low-carbon …

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Cryogenic Treatment Effect on Strength Properties of Bearing Steel for Cold Rolling Rolls

Seiji Ito, Utata Miyoshi, Shohei Ueki, Toshiyuki KONDO et autres

Rolling elements, commonly known as spalling elements, may undergo damage during use. Spalling damage can be divided into three processes, viz. crack initiation, extension, and delamination, which occur via the following mechanisms: crack extension, caused by the cyclic loading of an initiating …

jp (code pays fourni par la source)

Fatigue strength evaluation method based on fatigue crack extension mechanism in BCC martensitic steels

Pengxu Ren, Shigeru Hamada, Shohei Ueki, Daisuke Itoh et autres

jp (code pays fourni par la source)

Anisotropic slip behaviour of lath martensite block in ultra-low carbon steel

Shohei Ueki, Shigekazu Morito

jp (code pays fourni par la source)

Effects of crystallographic orientation and lamellar configuration on fatigue crack propagation in single-colony structures of Ti–6Al–4V alloy: Alternating shear crack growth vs. damage accumulation crack propagation

Shohei Ueki, Yoji Mine, Yu‐Lung Chiu, P. Bowen et autres

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Comparative Study of Shear Fracture between Fe-based Amorphous and Ultrafine-grained Alloys Using Micro-tensile Testing

Yuki Tampa, K. Takagi, Shohei Ueki, M. Ohta et autres

Micro-tensile tests were employed to clarify the post-plastic-instability behavior in the shear fractures of specimens with the dimensions of 18×25×50 µm3 made from iron-based amorphous (AM) and ultrafine-grained (UFG) alloys. The AM specimen yielded by localized shear bands with an inclination angle …

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Effect of β lath arrangement on activation of slips in single-colony lamellar structures of Ti-6Al-4V alloy

Satoshi AKIMOTO, Shohei Ueki, Kwangsik Kwak, Yoji Mine et autres

Micro-tensile tests using single-colony specimens of Ti-6Al-4V alloy with a fine lamellar microstructure were employed in the temperature range between 298 and 423 K to understand the effects of geometrical orientation of β lath on slip behaviour. The critical resolved shear stress …

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マイクロ引張試験を用いた304型ステンレス鋼の水素誘起双晶境界分離の結晶学的評価

Shohei Ueki, Kaoru Koga, Yoji Mine, Kazuki Takashima

Micro-tensile behaviour and the corresponding microstructural evolution under hydrogen pre-charging conditions were examined on single-crystalline and twinned bi-crystalline specimens with the same [111] loading axis to elucidate the hydrogen-induced twin boundary separation in type 304 stainless steel. A hydrogen pre-charge increased the …

jp, us, id (code pays fourni par la source)

Crystallographic Characterisation of Hydrogen-induced Twin Boundary Separation in Type 304 Stainless Steel Using Micro-tensile Testing

Shohei Ueki, Kaoru Koga, Yoji Mine, Kazuki Takashima

Micro-tensile behaviour and the corresponding microstructural evolution under hydrogen pre-charging conditions were examined on single-crystalline and twinned bi-crystalline specimens with the same [111] loading axis to elucidate the hydrogen-induced twin boundary separation in type 304 stainless steel. A hydrogen pre-charge increased the …

jp (code pays fourni par la source)

Effect of geometric lath orientation on fatigue crack propagation via out-of-plane dislocation glide in martensitic steel

Shohei Ueki, Yoji Mine, Xinyu Lu, Yu‐Lung Chiu et autres

jp, gb (code pays fourni par la source)