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Principle for obtaining high joint quality in dissimilar friction welding of Ti-6Al-4V alloy and SUS316L stainless steel

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Journal of Materials Science & Technology 2020年第11期42卷 211-224页

作者： Huihong Liu Yo Aoki Yasuhiro Aoki kohsaku ushioda Hidetoshi Fujii Joining and Welding Research Institute Osaka UniversityIbarakiOsaka 567-0047Japan

Ti-6Al-4V alloy(Ti64)and SUS316 L stainless steel rods were dissimilarly friction *** focusing on the detailed observation of interface microstructural evolution during the friction welding(FW),the relationship between the processing conditions,weld interface microstructure,and mechanical properties of the obtained joints were systematically investigated to elucidate the principle for obtaining a high joint quality in the FW of Ti64 and SUS316L.A higher friction pressure produced a lower welding temperature in the FW,hence suppressing the thick intermetallic compound layer ***,hard and brittle Ti64/SUS316L mechanically mixed layers generally formed especially at the weld interface periphery due to the high temperature increasing rate,high rotation linear velocity and high outward flow velocity of the *** harmful layers tended to induce the cracks/voids formation at the weld interfaces hence deteriorating the joints’mechanical *** rotation speed reduction and liquid CO2 cooling during the entire processing decreased the temperature increasing rate,rotation linear velocity and outward flow velocity of the Ti64 at the weld interface ***,they suppressed the formation of the harmful mechanically mixed layers,facilitated the homogeneous and sound interface microstructure generation,and finally produced a high-quality dissimilar joint in the FW of Ti64 and SUS316L.

关键词： Friction welding Titanium alloy Stainless steel Microstructure formation mechanism Mechanically mixed layers

Quasi-in-situ investigation into the microstructure and texture evolution of pure magnesium during friction stir welding

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Journal of Magnesium and Alloys 2020年第4期8卷 1071-1083页

作者： Zhou Mengran Sun Yufeng Morisada Yoshiaki ushioda kohsaku Fujii Hidetoshi Joining and Welding Research Institute Osaka UniversityOsaka 567-0047Japan The State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China School of materials science and engineering Zhengzhou UniversityZhengzhou 450001China

The quasi-in-situ microstructure and texture evolution along the real flow path of pure magnesium during friction stir welding were *** representative stages were involved from the base metal to the formation of the final stir *** material experienced compression,preheating,acceleration,deceleration,and subsequent annealing over the course of the welding process.A highly concentrated(0001)texture,denoted as''orientation convergence^,was initiated at the beginning of the acceleration stage(shearing deformation zone)in front of the *** continuous and discontinuous dynamic recrystallization occurred simultaneously in the stir zone,and continuous dynamic recrystallization was determined to be the primary recrystallization *** marker material morphology and EBSD data were used to elucidate the in-situ evolution of the shear direction and shear plane along with the real flow path.

关键词： Magnesium Friction stir welding Texture evolution Material flow EBSD

《日本钢铁协会》Vol．55（2015），No．12，P2667—2676 氢对弹簧钢疲劳性能的影响

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水钢科技 2016年第2期 57-66页

作者： Manabu KUBOTA Takahisa SUZUKI Daisuke HIRAKAMI kohsaku ushioda 高长益刘立德张东升叶雅妮赵光凤日本新日铁住友金属公司钢铁研究实验室日本新日铁住友金属公司室兰研究开发实验室首钢水钢技术中心贵州六盘水553028

为了提高弹簧钢的强度级别、减轻弹簧钢的重量，则提高腐蚀疲劳性能是最重要的任务。本文研究残余应力、腐蚀坑深度、氢含量对双喷丸和三喷丸试样的旋转弯曲疲劳性能的影响，得到如下结果：（1）对于人工腐蚀坑深度为250um的试样，无论... 详细信息

为了提高弹簧钢的强度级别、减轻弹簧钢的重量，则提高腐蚀疲劳性能是最重要的任务。本文研究残余应力、腐蚀坑深度、氢含量对双喷丸和三喷丸试样的旋转弯曲疲劳性能的影响，得到如下结果：（1）对于人工腐蚀坑深度为250um的试样，无论是含氢或不舍氢，三喷丸都明显地提高疲劳极限；（2）对于含氢试样，夹杂物鱼眼疲劳开裂通常是疲劳断裂的起源；（3）无论人工腐蚀坑的深浅如何。喷丸试样的疲劳极限与人工腐蚀坑底部的残余压应力之间具有很好的对应关系。

关键词：高强度低合金钢腐蚀疲劳喷丸残余应力氢鱼眼疲劳开裂

General understanding on physical stability of pharmaceutical glasses

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Asian Journal of Pharmaceutical Sciences 2016年第1期11卷 54-55页

作者： kohsaku Kawakami Takuji Harada Mayuko Fukushima Yasuo Yoshihashi Etsuo Yonemochi Katsuhide Terada International Center for Materials Nanoarchitectonics National Institute for Materials ScienceTsukuba 305-0044Japan Faculty of Pharmaceutical Sciences Toho UniversityFunabashi 274-8510Japan Institute of Medicinal Chemistry Hoshi UniversityTokyo 142-8501Japan

Although amorphous solid dispersion is one of the most important formulation technologies for poorly soluble drugs[1],the number of marketed oral amorphous formulations is still *** lack of an accelerated study protocol for predicting crystallization behavior of amorphous forms has been one of the biggest issues that inhibit their wide *** crystallization behavior of pharmaceutical glasses is discussed in this presentation with an eventual aim of predicting physical stability of amorphous dosage forms.

关键词： Solid dispersion Crystallization Stability Surface

Nitric oxide synthase in the human airway epithelium

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Acta Pharmacologica Sinica 1997年第6期 70-72页

作者： Raed A DWEIK1, Fuhua H GUO1,2, kohsaku UETANI1,2, Serpil C ERZURUM1,2\ (1Departments of Pulmonary and Critical Care Medicine, and\ 2Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195,

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ＮｉｔｒｉｃｏｘｉｄｅｓｙｎｔｈａｓｅｉｎｔｈｅｈｕｍａｎａｉｒｗａｙｅｐｉｔｈｅｌｉｕｍＲａｅｄＡＤＷＥＩＫ１，ＦｕｈｕａＨＧＵＯ１，２，ＫｏｈｓａｋｕＵＥＴＡＮＩ１，２，ＳｅｒｐｉｌＣＥＲＺＵＲＵＭ１，２（１ＤｅｐａｒｔｍｅｎｔｓｏｆＰｕｌｍｏｎ...

关键词： synthase the epithelium human oxide Nitric airway