|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Effect of Ca addition on the microstructure and the mechanical properties of asymmetric double-sided friction stir welded AZ61 magnesium alloy显示文摘The effects of 2%Ca addition on the microstructure and the mechanical properties of the asymmetric double-sided friction stir welded magnesium alloy AZ61 were investigated.Compared to the Ca-free AZ61magnesium alloy,the addition of 2%Ca significantly refines the grains in the stir zone after welding.Due to the existence of thermally stable Al2Ca particles,there is no noticeable change in the grain size in the stir zone regardless of the welding heat input.The electron backscattered diffraction analysis at the center of the stir zone confirmed the significant deterioration of the(0001)texture strength from the addition of 2%Ca.The tensile test of the joint suggested that the addition of 2%Ca provides stable tensile properties to the joint regardless of the welding parameters.The critical(0001)texture strength that determines the ultimate tensile strength decreased from 20 to 15 by the Ca addition.The addition of Ca enhanced the deterioration of the plastic elongation when the(0001)texture strength increased. | Mengran Zhou Yoshiaki Morisada Hidetoshi Fujii | 2020 | Journal of Magnesium and Alloys2020，8，1： | 10 |
| 2 | Time Dependant Weld Shape in Ar-O_2 Shielded Stationary GTA Welding显示文摘静止的煤气的钨弧焊(GTA ) 在 Ar-0.1%O2 下面在 SUS304stainless 钢上被执行, Ar-0.3%02 混合了防护观察熔融的水池的进化并且在焊接形状上调查 Marangoni 传送对流的角色。在焊接以后,在焊接金属的氧内容被使用一个氧 / 氮分析器测量。到氩的氧的小增加基于防护气体能有效地调整焊接水池氧内容。氧作为表面起一个重要作用在在不锈钢焊接水池决定 Marangoni 传送对流的模式的活跃元素。当焊接金属氧内容在临界数值上时, 0.01 wtpct,相应于 Ar-O.3%O2 防护气体混合, Marangoni 传送对流变化从对里面的方向和焊接形状外面戏剧性地从宽浅形状变化深变窄形状。 | Shanping L U Dianzhong LI Hidetoshi Fujii Kiyoshi Nogi | 2007 | Journal of Materials Science & Technology2007，23，5： | 5 |
| 3 | Serum Mac-2 binding protein is a novel biomarker for chronic pancreatitis显示文摘AIM: To determine the efficacy of Mac-2 binding protein(Mac-2bp) for diagnosis of chronic pancreatitis.METHODS: Fifty-nine healthy volunteers(HV), 162 patients with chronic pancreatitis(CP), and 94 patients with pancreatic ductal adenocarcinoma(PDAC) were enrolled in this study. We measured serum Mac-2bp using our developed enzyme-linked immunosorbent assay kit. Additional biochemical variables were measured using an automated analyzer(including aminotransferase, alanine aminotransferase, γ-glutamyltransferase, alkaline phosphatase, triglyceride, C-reactive protein, and amylase levels) or chemiluminescent enzyme immunoassay(carbohydrate antigen 19-9 and carcinoembryonic antigen). The ability of Mac-2bp to predict CP diagnosis accurately was assessed using receiver operating characteristic(ROC) analyses.RESULTS: Serum Mac-2bp levels were significantly increased in CP patients compared to HV(P < 0.0001) and PDAC patients(P < 0.0001). Area under the ROC curve values of Mac-2bp for the discrimination of CP from HV and PDAC were 0.727 and 0.784, respectively. Multivariate analyses demonstrated that serum Mac-2bp levels were independent determinants for CP diagnosis from HV and PDAC patients. Immunohistological staining showed that Mac-2bp was expressed faintly in the pancreas tissues of both CP and PDAC patients. Serum aspartate aminotransferase, alanine aminotransferase, γ-glutamyltransferase, alkaline phosphatase, and triglyceride levels were significantly higher in patients with CP or PDAC. Serum Mac-2bp levels were highly correlated with protein levels of alanine aminotransferase, γ-glutamyltransferase, and C-reactive protein, but not amylase, suggesting that the damaged liver produces Mac-2bp. CONCLUSION: Measurement of serum Mac-2bp may be a novel and useful biomarker for CP diagnosis as well as liver fibrosis in the general population. | Tomohiro Maekawa Yoshihiro Kamada Yusuke Ebisutani Makiko Ueda Tomoki Hata Koichi Kawamoto Shinji Takamatsu Kayo Mizutani Mayuka Shimomura Tomoaki Sobajima Hironobu Fujii Kotarosumitomo Nakayama Kimihiro Nishino Makoto Yamada Takashi Kumada Toshifumi Ito Hidetoshi Eguchi Hiroaki Nagano Eiji Miyoshi | 2016 | World Journal of Gastroenterology2016，22，17： | 3 |
| 4 | Principle for obtaining high joint quality in dissimilar friction welding of Ti-6Al-4V alloy and SUS316L stainless steel显示文摘Ti-6Al-4V alloy(Ti64)and SUS316 L stainless steel rods were dissimilarly friction welded.Especially 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 formation.However,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 Ti64.These harmful layers tended to induce the cracks/voids formation at the weld interfaces hence deteriorating the joints’mechanical properties.The 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 periphery.Therefore,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. | Huihong Liu Yo Aoki Yasuhiro Aoki Kohsaku Ushioda Hidetoshi Fujii | 2020 | Journal of Materials Science & Technology2020，42，11： | 3 |
| 5 | 基于工件与外部可消耗工具摩擦的焊接技术研究进展显示文摘摩擦焊是一类依靠摩擦产热来实现材料连接的固相焊接技术,具有接头质量高、焊接变形小、节能环保等优点,广泛应用于航空航天、交通运输、矿山机械、海洋装备等领域.近年来,摩擦焊技术发展迅速,一些改型的工艺相继产生.根据相互摩擦对象的属性对摩擦焊技术进行了分类,归纳了各自的主要工艺特点.对基于工件与外部可消耗工具相互摩擦的焊接技术进行了系统综述,重点介绍了径向摩擦焊、摩擦-铆接、摩擦塞补焊、摩擦堆焊和涡流搅拌摩擦焊的基本工艺原理和最新研究进展,同时对以上工艺技术的未来发展展开了讨论,以期为相关领域的科研工作者提供参考. | 刘小超 倪中华 崔远驰 武传松 石磊 Hidetoshi Fujii | 2022 | 焊接学报2022，43，7： | 3 |
| 6 | Quasi-in-situ investigation into the microstructure and texture evolution of pure magnesium during friction stir welding显示文摘The quasi-in-situ microstructure and texture evolution along the real flow path of pure magnesium during friction stir welding were investigated.Five representative stages were involved from the base metal to the formation of the final stir zone.The 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 tool.Both continuous and discontinuous dynamic recrystallization occurred simultaneously in the stir zone,and continuous dynamic recrystallization was determined to be the primary recrystallization mechanism.The 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. | Zhou Mengran Sun Yufeng Morisada Yoshiaki Ushioda Kohsaku Fujii Hidetoshi | 2020 | Journal of Magnesium and Alloys2020，8，4： | 2 |
| 7 | Effect of Stacking Fault Energy on the Grain Structure Evolution of FCC Metals During Friction Stir Welding显示文摘The effect of stacking fault energy(SFE) on the grain structure evolution of face-centered cubic metals during friction stir welding was investigated by using pure aluminum,pure copper and Cu-30 Zn alloy as experiment materials.Tool 'stop action' and rapid cooling were employed to 'freeze' the microstructure of the flowing materials around the tool.Marker materials were used to show the streamline of the material flow.The microstructures of the three materials at different welding stages were contrastively studied by the electron backscatter diffraction technique.The results show that at the material flow stage,as the SFE decreases,the grain structure evolution changes from the continuous dynamic recrystallization to discontinuous dynamic recrystallization,and further to the dynamic equilibrium between the annealing twinning due to thermally activated grain boundary migration and the twin destruction during the plastic deformation.Owing to different grain structure evolution mechanisms,the grain structure at the end of the material flow is greatly different.Especially in copper,a lot of dislocations remain,which gives rise to the static recrystallization occurring during the subsequent cooling stage. | Xiaochao Liu Yufeng Sun Tomoya Nagira Kohsaku Ushioda Hidetoshi Fujii | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，7： | 2 |
| 8 | Effect of the processing route on the microstructure and mechanical behavior of superlight Mg-9Li-1Zn alloy via friction stir processing显示文摘In this study, the effect of the processing route using a friction stir processing(FSP) method on the microstructure and mechanical behavior of a Mg-9Li-1Zn alloy was systematically investigated. In the FSP method, the odd-numbered(1st and 3rd) process directions and even-numbered(2nd and 4th) passes were alternated to distribute the strain throughout the whole processed zone uniformly. Consequently, the processed zone had a much more uniform microstructure and hardness distribution than the processed zone obtained using the conventional FSP method. Using this method, the grain size of a Mg-9Li-1Zn sheet alloy was refined from ~31 μm to ~0.21 μm with uniformly distributedα and β phases. The processed alloy exhibited a high strength-ductility synergy with an ultimate tensile strength(UTS) of 220.1 MPa and total elongation of 70.0% at a strain rate of 10^(-3)s^(-1), overwhelmingly higher than those of the base metal, 155.6 MPa in UTS and 36.0%in elongation. The in-situ SEM-DIC analysis and TEM observation demonstrated that such an outstanding ductility with moderate strength is caused by grain boundary sliding, the dominant deformation mechanism of the ultra-fine-grained sample after FSP. The processing route with reverse processing direction was proven to be efficient in producing the ultrafine grain size microstructure and improving the mechanical properties of superlight Mg-9Li-1Zn alloy. | Mengran Zhou Zhuoran Zeng Chun Cheng Yoshiaki Morisada Qingyu Shi Jian-Yih Wang Hidetoshi Fujii | 2022 | Journal of Magnesium and Alloys2022，10，11： | 2 |
| 9 | Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO_2) Double Shielded GTA Welding显示文摘Double shielded gas tungsten arc welding (GTAW, also known as tungsten inert gas (TIG) welding) of an SUS304 stainless steel with pure inert argon as the inner layer shielding and the Ar-CO2 or CO2 active gas as the out layer shielding was proposed in this study to investigate its effect on the tungsten electrode protection and the weld shape variation. The experimental results showed that the inner inert argon gas can successfully prevent the outer layer active gas from contacting and oxidizing the tungsten electrode during the welding process. Active gas, carbon dioxide, in the outer layer shielding is decomposed in the arc and dissolves in the liquid pool, which effectively adjusts the active element, oxygen, content in the weld metal. When the weld metal oxygen content is over 70× 10-6, the surface-tension induced Marangoni convection changes from outward into inward, and the weld shape varies from a wide shallow one to a narrow deep one. The effect of the inner layer gas flow rate on the weld bead morphology and the weld shape was investigated systematically. The results show that when the flow rate of the inner argon shielding gas is too low, the weld bead is easily oxidized and the weld shape is wide and shallow. A heavy continuous oxide layer on the liquid pool is a barrier to the liquid pool movement. | Shanping Lu Hidetoshi Fujii Kiyoshi Nogi | 2010 | Journal of Materials Science & Technology2010，26，2： | 2 |
| 10 | Flat friction spot joining of aluminum alloy to carbon fiber reinforced polymer sheets:Experiment and simulation显示文摘The Al alloy and carbon fiber reinforced polymer(CFRP)hybrid structures,incorporating the performance advantages of the two materials,have been attracting more attention in high-end manufacturing fields.In the current investigation,the flat friction spot joining(FSJ)was employed in joining the AA6061-T6 alloy and CFRP sheets.The significance of temperature distribution in influencing joint quality was highlighted through analyzing interface microstructural features,weld defect formation as well as fractography.To understand the role of thermal energy generation and conduction in the process comprehensively,a 3D thermal-mechanical coupling finite element model was established.The interfacial temperature was characterized by an uneven distribution behavior due to the inhomogeneous heat distribution.The peak temperatures on the top surface and Al alloy to CFRP interface at 1500 rpm rotational speed with 0.1 mm/s plunging speed were 498℃and 489°C,respectively.The peak interface temperature was reduced to286℃at 250 rpm,which produced an extremely small melted area.Compared with the plunging speed,rotational speed was found to be the predominant parameter for determining the joint property,which could be optimized to simultaneously realize the avoidance of thermal decomposition of CFRP,the sufficient melting duration time,and the wide enough melted area.Simulated thermal histories and melted area profiles were in agreement with experimental ones.The findings could be utilized to provide some feasible guidance for process optimization of dissimilar FSJ of metals and composites. | Peihao Geng Ninshu Ma Hong Ma Yunwu Ma Kazuki Murakami Huihong Liu Yasuhiro Aoki Hidetoshi Fujii | 2022 | Journal of Materials Science & Technology2022，，12： | 1 |
| 11 | Influence of welding parameters and shielding gas composition on GTA weld shape显示文摘 | Shanping LU Hidetoshi FUJII Kiyoshi NOGI | 2005 | ISIJ International2005，，45： | 1 |
| 12 | Investigation of Welding Parameter Dependent Microstruc- ture and Mechanical Properties in Friction Stir Welded Pure Ti Joints 显示文摘 | Hidetoshi Fujii Yufeng Sun Hideaki Kato | 2010 | Materials Science and Engineering A2010，527，15： | 1 |
| 13 | Effects of CO2Shielding Gas Additions and Welding Speed on GTA Weld Shape显示文摘 | Lu Shanping Fujii Hidetoshi Nogi Kiyoshi | 2005 | Journal of Materials Sci-ence2005，40，910： | 1 |
| 14 | Formation and disappearance of pores in aluminum alloy molten pool under microgravity 显示文摘 | Hidetoshi Fujii Kiyoshi Nogi | 2004 | Science and Technology of Advanced Materials2004，，5： | 1 |
| 15 | Modification of thermally sprayed cemented carbide layer by friction stir processing 显示文摘 | Morisada Yoshiaki Hidetoshi Fujii Tadashi Mizuno | 2010 | Surface and Coating Technology2010，204，15： | 1 |
| 16 | Deve- lopment of Supersonic wave TIG welding method显示文摘 | Taihei Matsumoto Hidetoshi Fujii Kouki Kitamura | 2006 | IIW- Doc2006，，： | 1 |
| 17 | Fabrication of nanostructured tool steel layer by combination of laser cladding and friction stir processing显示文摘 | Yoshiaki Morisada Hidetoshi Fujii Tadashi Mizuno Genryu Abe Toru Nagaoka Masao Fukusumi | 2010 | Surface & Coatings Technology2010，，11： | 1 |
| 18 | Marangoni convection and welding penetration in A-TIG welding 显示文摘 | Lu Shangping Fujii Hidetoshi Sugiyama Hiroyuki | 2003 | Transaction of JWRI2003，32，1： | 1 |
| 19 | Investigation of welding parameter dependent microstructure and mechanical properties in friction stir welded pure Ti joints显示文摘 | Hidetoshi Fujii Yufeng Sun Hideaki Kato Kazuhiro Nakata | 2010 | Materials Science & Engineering A2010，，15： | 1 |
| 20 | Sensitivity of Marangoni convection and weld shape variations to welding parameters in O2-Ar shielded GTA welding 显示文摘 | Lu Shanping Fujii Hidetoshi Nogi Kiyoshi | 2004 | Scripta Materialia2004，51，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员