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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Electron microscopic observation of grain boundary in thermomechanical-processed SUS 304 stainless steel
TL;DR: In this article, the carbonide precipitation and chromium distribution in low-energy coincidence site lattice (CSL) segment induced by twinning at random boundary were investigated in thermomechanical-processed (TMPed) SUS 304 stainless steel.
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Microstructure and electrical properties of lead zirconate titanate thin films deposited by sol-gel method on La0.7Sr0.3MnO3/SiO2/Si substrate
TL;DR: In this article, the effects of annealing temperature on the crystalline phases, microstructures and electrical properties of PZT films were investigated, and the results indicated that the PZTs films with a perovskite single phase could be obtained by annaling at 650°C.
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Effect of grain boundary character distribution on stress corrosion cracking behavior in austenitic stainless steels
Ryo Ishibashi,Toshiaki Horiuchi,Jiro Kuniya,Michiyoshi Yamamoto,Sadahiro Tsurekawa,Hiroyuki Kokawa,Tadao Watanabe,Tetsuo Shoji +7 more
TL;DR: In this article, the effect of grain boundary character distribution (GBCD) on intergranular stress corrosion cracking (IGSCC) in austenitic stainless steels in high temperature water was verified experimentally.
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Tool wear and reactions in 304 stainless steel during friction stir welding
TL;DR: In this article, four kinds of the welding tools made of PCBN, W, WC and Al2O3 were applied to FSW of 304 stainless steel, and then the wear and reaction between the tool debris and the steel matrix were examined for each tool material.
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Strength Improvement Through Grain Refinement of Intermetallic Compound at Al/Fe Dissimilar Joint Interface by the Addition of Alloying Elements
TL;DR: In this paper, the effect of the alloying element on the joint strength associated with the Al-Fe intermetallic compound layer at the dissimilar interface was examined, and it was shown that the addition of an appropriate amount of an Alloying element to the alloy increased joint strength.