H
Hiroyuki Kokawa
Researcher at Shanghai Jiao Tong University
Publications - 280
Citations - 11770
Hiroyuki Kokawa is an academic researcher from Shanghai Jiao Tong University. The author has contributed to research in topics: Welding & Friction stir welding. The author has an hindex of 51, co-authored 271 publications receiving 10329 citations. Previous affiliations of Hiroyuki Kokawa include Tohoku University & Toho University.
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Interlayer thickening for development of laser-welded Ti-SS joint strength
Seyed Reza Elmi Hosseini,Kai Feng,Pulin Nie,Ke Zhang,Jian Huang,Zhuguo Li,Hiroyuki Kokawa,Baochao Guo,Song Xue +8 more
TL;DR: In this paper, the authors investigated the mechanical strength and microstructural characterization of the laser beam-welded Ti6Al4V304 stainless steel (SS) joints using different interlayer thicknesses at single and double interlayer structures.
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Control of precipitation behaviour of Hastelloy-X through grain boundary engineering
Xiaoyan Wang,Kentaro Kurosawa,Ming Huang,Xianke Lu,Dao Zhang,Hiroyuki Kokawa,Yinbiao Yan,Sen Yang +7 more
TL;DR: In this article, grain boundary engineering (GBE) was employed to control the precipitation behavior of Hastelloy-X alloy, and the precipitate characteristics and thermal stability of grain boundary character distribution (GBCD) were investigated by aging at 850°C.
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Effects of in-situ synthesized TiB2 on crystallographic orientation, grain size and nanohardness of AA6061 alloy by laser surface alloying
TL;DR: In this article, the effect of reinforced aluminum metal matrix composites (MMCs) were in-situ synthesized by laser surface alloying (LSA), and the results indicated that TiB2 particles mainly exhibited hexagonal plate-like morphology and distributed at high angle grain boundaries (HAGBs).
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Microstructural Characterization of Friction-Stir Processed Ti-6Al-4V
TL;DR: In this paper, the electron backscatter diffraction (EBSD) technique was employed to characterize the crystallographic aspects of such microstructure, and the texture and misorientation distribution exhibited a crystallographic preference of 60° and 90° boundaries, which was attributed to a partial α→β→α phase transformation during/following high temperature deformation and the possible activation of mechanical twinning.
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Grain Boundary Engineering for Intergranular Corrosion Resistant Austenitic Stainless Steel
TL;DR: In this paper, the optimum parameters in the thermomechanical treatment during grain boundary engineering (GBE) were investigated for improvement of intergranular corrosion resistance of type 304 austenitic stainless steel.