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Improvement of Intergranular Stress Corrosion Crack Susceptibility of Austenite Stainless Steel through Grain Boundary Engineering

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Journal of Materials Science & Technology 2007年第6期23卷 785-789页

作者： Weizhong JIN Sen YANG hiroyuki kokawa Zhanjie WANG Yutaka S.Sato Department of Materials Processing Graduate School of Engineering Tohoku University Aoba-yama 6-6-02 Sendai 980-8579 Japan College of Materials Science and Engineering Inner Mongolia University of Technology Hohhot 010051 China

Intergranular stress corrosion crack susceptibility of austenite stainless steel was evaluated through threepoint bending test conducted in high temperature water. The experimental results showed that the frequent and efficient introduction of low energy coincidence site lattice boundaries through grain boundary engineering resulted in an apparent improvement of the intergranular stress corrosion crack resistance of austenite stainless steel.

关键词： Intergranular stress corrosion cracking Grain boundary engineering Coincidence site lattice Austenite stainless steel

Fe-36%Ni合金搅拌摩擦焊接头组织与性能的改善

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焊接 2012年第5期 13-17,69页

作者：赵玥吴爱萍任家烈 Yutaka S.Sato hiroyuki kokawa 清华大学机械工程系先进成形制造教育部重点实验室北京市100084 Department of Materials Processing Tohoku University

随着能源业的发展,Fe-36%Ni合金作为结构材料的应用需求越来越广,而电弧焊时存在严重的热裂纹和再热裂纹问题。采用搅拌摩擦焊方法焊接Fe-36%Ni合金可以有效地避免电弧焊带来的裂纹问题,获得成形良好的接头。但已有研究获得的焊缝组织... 详细信息

随着能源业的发展,Fe-36%Ni合金作为结构材料的应用需求越来越广,而电弧焊时存在严重的热裂纹和再热裂纹问题。采用搅拌摩擦焊方法焊接Fe-36%Ni合金可以有效地避免电弧焊带来的裂纹问题,获得成形良好的接头。但已有研究获得的焊缝组织均有晶粒粗化的特点,导致其接头力学性能低于母材。因此,需要解决晶粒粗化问题,寻找组织与性能获得改善的方法。采用控制焊接工艺的方法改善Fe-36%Ni合金搅拌摩擦焊接头的组织和性能。结果表明,在较低的焊接速度下,调整搅拌头转速更适合于控制Fe-36%Ni合金搅拌摩擦焊接头的晶粒尺寸。搅拌头低转速带来较低的焊接热输入,使焊缝具有晶粒尺寸与母材相当或较母材晶粒细化的组织。晶粒尺寸是接头力学性能的主导因素。在400 r/min和2 mm/s的焊接工艺下可获得与母材晶粒尺寸相近、强度和硬度相当、断后伸长率也较高的接头。

关键词：搅拌摩擦焊 Fe-36%Ni合金晶粒细化力学性能

Fe-36wt%Ni合金搅拌摩擦焊接头组织与性能的改善

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Fe-36wt%Ni合金搅拌摩擦焊接头组织与性能的改善

Successful initial ablation therapy contributes to survival in patients with hepatocellular carcinoma

第十六次全国焊接学术会议

作者：赵玥吴爱萍任家烈 Yutaka S.Sato hiroyuki kokawa 清华大学机械工程系先进成形制造教育部重点实验室 Department of Materials Processing Graduate School of EngineeringTohoku University6-6-02 Aramaki-aza-AobaSendai 980-8579Japan

随着能源业的发展,Fe-36wt%Ni合金作为结构材料的应用需求越来越广,电弧熔化焊时存在严重的热裂纹和再热裂纹问题。采用搅拌摩擦焊方法焊接Fe-36wt%Ni合金可以有效避免电弧焊带来的裂纹问题,获得成形良好的接头。但已有研究获得的焊缝... 详细信息

随着能源业的发展,Fe-36wt%Ni合金作为结构材料的应用需求越来越广,电弧熔化焊时存在严重的热裂纹和再热裂纹问题。采用搅拌摩擦焊方法焊接Fe-36wt%Ni合金可以有效避免电弧焊带来的裂纹问题,获得成形良好的接头。但已有研究获得的焊缝组织均有晶粒粗化的特点,导致其接头力学性能低于母材。因此需要解决晶粒粗化问题,寻找组织与性能获得改善的方法。本文采用控制焊接工艺的方法改善Fe-36wt%Ni合金搅拌摩擦焊接头的组织和性能。结果表明,在较低的焊接速度下,调整搅拌头转速更适合于控制Fe-36wt%Ni合金搅拌摩擦焊接头的晶粒尺寸。低搅拌头转速带来的较低的焊接热输入,使焊缝具有晶粒尺寸与母材相当或较母材晶粒细化的组织。晶粒尺寸是接头力学性能的主导因素。在400rpm 2mm/s的焊接工艺下获得了与母材晶粒尺寸相近、强度和硬度相当、延伸率也较高的接头。

关键词：搅拌摩擦焊 Fe-36wt%Ni合金晶粒细化力学性能

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World Journal of Gastroenterology 2007年第7期13卷 1003-1009页

作者： Manabu Morimoto Kazushi Numata Kazuya Sugimori Kazuhito Shirato Atsushi kokawa hiroyuki Oka Kingo Hirasawa Ryonho Koh Hiromi Nihommatsu Katsuaki Tanaka Gastroenterological Center Yokohama City University Medical Center 4-57 Urafune-cho Minami-ku Yokohama 232-0024 Japan

AIM： To evaluate the outcome predictors of percutaneous ablation therapy in patients with unresectable hepatocellular carcinoma （HCC）, especially to identify whether the initial treatment response contributes to the survival of the patients. METHODS： The study cohort included 153 patients with single （102） and two or three （51） HCC nodules 5 cm or less in maximum diameter. As an initial treatment, 110 patients received radiofrequency ablation and 43 patients received percutaneous ethanol injection. RESULTS： The Kaplan-Meier estimates of overall 3- and S-year survival rates were 75% and 59%, respectively. The log-rank test revealed statistically significant differences in the overall survivals according to ChildPugh class （P = 0.0275）, tumor size （P = 0.0130）, serum albumin level （P = 0.0060）, serum protein induced by vitamin K absence or antagonist Ⅱ level （P = 0.0486）, and initial treatment response （P = 0.0130）. The independent predictors of survival were serum albumin level （dsk ratio, 3.216; 950 CI, 1.407-7.353; P = 0.0056） and initial treatment response （risk ratio, 2.474; 95% CI, 1.076-5.692; P = 0.0330） based on the Cox proportional hazards regression models. The patients had a serum albumin level 3.5 g/dL and the 3- and 5-year survival rates of 86% and 82%. CONCLUSION： In HCC patients treated with percutaneous ablation therapy, serum albumin level and initial treatment response are the independent outcome predictors.

关键词： Percutaneous ethanol injection Radio-frequency ablation Successful initial treatment Overallsurvival Prognostic factor

Friction-stir welding and processing of Ti-6Al-4V titanium alloy:A review

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Journal of Materials Science & Technology 2018年第1期34卷 58-72页

作者： S.Mironov Y.S.Sato H.kokawa Department of Materials Processing Graduate School of Engineering Tohoku University

In this work, the current understanding and development of fliction-stir welding and processing of Ti- 6Al-4V alloy are briefly reviewed. The critical issues of these processes are addressed, including welding tool materials and design, tool wea,, processing temperature, material flow, processing window and residual stresses. A particular emphasis is given to microstructural aspects and microstructure-properties relationship. Potential engineering applications are highlighted.

关键词： Ti-6Al-4V titanium alloy Friction-stir welding Friction-stir processing Microstructure Properties

High Resolution Scanning Probe Microscopy and its Application for Polymers

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High Resolution Scanning Probe Microscopy and its Applicatio...

Grain boundary engineering for intergranular corrosion resistant austenitic stainless steel

2016年全国高分子材料科学与工程研讨会

作者： R.kokawa JST/Advanced Measurement and Analysis（SENTAN） Shimadzu Corporation Japan

＜正＞*** Resolution Scanning Probe Microscopy The scanning probe microscopy is a powerful method for imaging topography of solids and also for observing material properties on *** on an industry-university cooperation,we have developed a frequency-modulation atomic force microscope（FM-AFM）compatible with advanced applications in viscous environments,as shown in *** atomic/molecular resolution was achieved even in liquids as shown with an example of ***（PE）molecules

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材料与冶金学报 2005年第2期4卷 109-109页

作者：粉川博之 SHIMADA Masayuki MICHIUCHI Masato SAKAI Kenta SATO Yutaka S 日本东北大学 Department of Materials Processing Graduate School of EngineeringTohoku University 6-6-02 Aramaki-aza-Aob Sendai 980-8579 Japan Department of Materials Processing

Sensitization by chromium depletion due to chromium carbide precipitation at grain boundaries in austenitic stainless steels can not be prevented perfectly only by previous conventional techniques, such as reduction of carbon content, stabilization-treatment, local solution-heat-treatment, etc. Recent studies on grain boundary structure have revealed that the sensitization depends strongly on grain boundary character and atomic structure, and that low energy grain boundaries such as coincidence-site-lattice (CSL) boundaries have strong resistance to intergranular corrosion. The concept of ’grain boundary design and control’ has been developed as grain boundary engineering (GBE). GBEed materials are characterized by high frequencies of CSL boundaries which are resistant to intergranular deterioration of materials, such as intergranular corrosion. A thermomechanical treatment was tried to improve the resistance to the sensitization by GBE. A type 304 austenitic stainless steel was cold-rolled and solution-heat-treated, and then sensitization-heat-treated. The grain boundary character distribution was examined by orientation imaging microscopy (OIM). The intergranular corrosion resistance was evaluated by electrochemical potentiokinetic reactivation (EPR) and ferric sulfate-sulfuric acid tests. The sensitivity to intergranular corrosion was reduced by the thermomechanical treatment and indicated a minimum at a small roll-reduction. The frequency of CSL boundaries indicated a maximum at the small reduction. The ferric sulfate-sulfuric acid test showed much smaller corrosion rate in the thermomechanical-treated specimen than in the base material. A high density of annealing twins were observed in the thermomechanical-treated specimen. The results suggest that the therrmomechanical treatment can introduce low energy segments in the grain boundary network by annealing twins and can arrest the percolation of intergranular corrosion from the surface. The effects of carbon co

关键词：奥氏体不锈钢抗晶间腐蚀晶界工程 EPR

Coagulation syndrome: Delayed perforation after colorectal endoscopic treatments

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World Journal of Gastrointestinal Endoscopy 2015年第12期7卷 1055-1061页

作者： Kingo Hirasawa Chiko Sato Makomo Makazu Hiroaki Kaneko Ryosuke Kobayashi Atsushi kokawa Shin Maeda Division of Endoscopy Yokohama City University Medical Center Department of Gastroenterology Yokohama City University Graduate School of Medicine

Various procedure-related adverse events related to colonoscopic treatment have been reported. Previous studies on the complications of colonoscopic treatment have focused primarily on perforation or bleeding. Coagulation syndrome(CS), which is synonymous with transmural burn syndrome following endoscopic treatment, is another typical adverse event. CS is the result of electrocoagulation injury to the bowel wall that induces a transmural burn and localized peritonitis resulting in serosal inflammation. CS occurs after polypectomy, endoscopic mucosal resection(EMR), and even endoscopic submucosal dissection(ESD). The occurrence of CS after polypectomy or EMR varies according previous reports; most report an occurrence rate around 1%. However, artificial ulcers after ESD are largely theoretical, and CS following ESD was reported in about 9% of cases, which is higher than that for CS after polypectomy or EMR. Most cases of post-polypectomy syndrome(PPS) have an excellent prognosis, and they are managed conservatively with medical therapy. PPS rarely develops into delayed perforation. Delayed perforation is a severe adverse event that often requires emergency surgery. Since few studies have reported on CS and delayed perforation associated with CS, we focused on CS after colonoscopic treatments in this review. Clinicians should consider delayed perforation in CS patients.

关键词： Endoscopy Syndrome Colorectal Dissection Coagulati

Nd_2Fe_(14)B/α-Fe双相永磁合金快淬带的织构与形貌

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物理学报 1999年第S1期48卷 22-27页

作者：张敏刚柴跃生粉川良平郑建军金志浩西安交通大学金属材料强度国家重点实验室西安710049 太原重型机械学院材料工程系太原030024 日本岛津表面半导体机器部

利用Ｘ射线衍射仪和扫描探针显微镜研究了ＮｄＦｅＢ系双相永磁合金快淬带的织构与形貌．结果表明，合金快淬带自由面存在择优取向．与三元ＮｄＦｅＢ合金相比，复合添加Ｄｙ和Ｇａ具有增加合金快淬带织构和细化组织形貌的作用．

关键词：合金快淬带永磁合金自由面织构度柱状晶扫描探针显微镜 α-Fe 交换耦合作用纳米高饱和磁化强度