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Oxidation behavior of 4774DD1 Ni-based single-crystal superalloy at 980℃ in air

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China Foundry 2024年第2期21卷 116-124页

作者： Yu fang Ya-zhou Li Qiang Yang Qun-gong He xiu-fang gong Qian Duan Hai-yang Song Fu Wang Qiong-yuan Zhang Hong Zeng State Key Laboratory of Long-Life High Temperature Materials Dongfang Turbine Co.Ltd.Deyang 618000SichuanChina State Key Laboratory for Manufacturing System Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China

The oxidation behavior of a novel Ni-based single-crystal 4774DD1 superalloy for industrial gas turbine applications was investigated by the isothermal oxidation at 980℃ and discontinuous oxidation weight gain *** phase constitution and morphology of surface oxides and the characteristics of the crosssection oxide film were analyzed by XRD,SEM and *** show that the oxidation kinetics of the 4774DD1 superalloy follows the cubic law,indicating its weak oxidation resistance at this *** the oxidation time increases,the composition of the oxide film evolves as following:One layer consisting of a bottom Al_(2)O_(3)sublayer and an upper(Al_(2)O_(3)+NiO)mixture sublayer after oxidized for 25 ***,two layers composed of an outermost small NiO discontinuous grain layer and an internal layer for 75 *** internal layer is consisted of the bottom Al_(2)O_(3)sublayer,an intermediate narrow CrTaO_(4)sublayer,and an upper(Al_(2)O_(3)+NiO)mixture *** two layers comprising an outermost relative continuous NiO layer with large grain size and an internal layer as the oxidation time increases to 125 *** internal layer is composed of the upper(Al_(2)O_(3)+NiO)mixture sublayer,an intermediate continuous(CrTaO_(4)+NiWO_(4))mixture sublayer,and a bottom Al_(2)O_(3)***,three layers consisting of an outermost(NiAl2O_(4)+NiCr2O_(4))mixture layer,an intermediate(CrTaO_(4)+NiWO_(4))mixture layer,and a bottom Al_(2)O_(3)layer for 200 h.

关键词： nickel-base single crystal superalloy oxidation kinetics oxide film microstructure mechanism

Ultrasonic vibration assisted tungsten inert gas welding of dissimilar metals 316L and L415

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International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 943-953页

作者： Hong-xia Lan xiu-fang gong Sen-feng Zhang Liang Wang Bin Wang Li-ping Nie School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China State Key Laboratory of Long-life High Temperature Materials Dong Fang Turbine Co.Ltd.Deyang 618000China China National Erzhong Group Deyang Wanhang Die Forging Co. Ltd.Deyang 618000China School of Engineering Southwest Petroleum UniversityNanchong 637800China

Ultrasonic vibration assisted tungsten inert gas welding was applied to joining stainless steel 316 L and low alloy high strength steel *** effect of ultrasonic vibration on the microstructure and mechanical properties of a dissimilar metal welded joint of 316 L and L415 was systematically *** microstructures of both heat affected zones of L415 and weld metal were substantially refined,and the clusters ofδferrite in traditional tungsten inert gas(TIG)weld were changed to a dispersive distribution via the ultrasonic *** ultrasonic vibration promoted the uniform distribution of elements and decreased the micro-segregation tendency in the *** the application of ultrasonic vibration,the average tensile strength and elongation of the joint was improved from 613 to 650 MPa and from 16.15%to31.54%,*** content ofΣ3 grain boundaries around the fusion line zone is higher and the distribution is more uniform in the ultrasonic vibration assisted welded joint compared with the traditional one,indicating an excellent weld metal crack resistance.

关键词： ultrasonic vibration dissimilar metal welding microstructure mechanical properties micro-segregation electron backscatter diffraction

Numerical simulation of dendrite growth in Ni-based superalloy casting during directional solidification process

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Transactions of Nonferrous Metals Society of China 2019年第2期29卷 338-348页

作者： Xue-wei YAN Xiong GUO Yan-ling LIU xiu-fang gong Qing-yan XU Bai-cheng LIU Key Laboratory for Advanced Materials Processing Technology Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Dongfang Turbine Co. Ltd.Deyang 618000China Long-life High Temperature Materials State Key Laboratory Deyang 618000China

An understanding of dendrite growth is required in order to improve the properties of castings. For this reason, cellular automaton-finite difference(CA-FD) method was used to investigate the dendrite growth during directional solidification(DS)process. The solute diffusion model combined with macro temperature field model was established for predicting the dendrite growth behavior. Model validation was performed by the DS experiment, and the cooling curves and grain structures obtained by the experiment presented a reasonable agreement with the simulation results. The competitive growth of dendrites was also simulated by the proposed model, and the competitive behavior of dendrites with different misalignment angles was also discussed in ***, 3D dendrites growth was also investigated by experiment and simulation, and both were in good accordance. The influence on dendrites growth of initial nucleus was investigated by three simulation cases, and the results showed that the initial nuclei just had an effect on the initial growth stage of columnar dendrites, but had little influence on the final dendritic morphology and the primary dendrite arm spacing.

关键词： numerical simulation directional solidification dendrite growth Ni-based superalloy

花青素能减轻阿尔茨海默症模型细胞的氧化损伤(英文)

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生物化学与生物物理进展 2010年第7期37卷 779-785页

作者：刘玲玲盛柏杨闫玉芳龚锴马拓赵南明张秀芳公衍道清华大学生命科学学院生物膜与膜生物工程国家重点实验室北京100084

氧化胁迫在阿尔茨海默症(AD)的发病过程中起重要作用.花青素是一种广泛存在于植物中的黄酮类物质.实验结果表明,100μmol/L的花青素可以有效地缓解AD模型细胞氧化胁迫,具体表现为,降低AD模型细胞的H2O2易感性,减少胞内ROS和[NO]i.c-Jun... 详细信息

氧化胁迫在阿尔茨海默症(AD)的发病过程中起重要作用.花青素是一种广泛存在于植物中的黄酮类物质.实验结果表明,100μmol/L的花青素可以有效地缓解AD模型细胞氧化胁迫,具体表现为,降低AD模型细胞的H2O2易感性,减少胞内ROS和[NO]i.c-Jun氨基端激酶(JNK)是氧化胁迫导致细胞损伤的重要信号途径.实验结果显示花青素可以有效地抑制氧化胁迫对JNK的激活.提示花青素的抗氧化胁迫作用与JNK信号途径有关.因此,花青素可以作为一种氧化胁迫因子的清除剂来保护AD模型细胞,有望用于AD的辅助治疗.

关键词：阿尔茨海默症氧化胁迫花青素 c-Jun氨基端激酶(JNK)

The low-latitude sodium layer:comparative data from lidar observations at Hainan,China and São Paulo,Brazil

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Earth and Planetary Physics 2025年第1期9卷 39-53页

作者： fang Wu Jing Jiao GuoTao Yang Lifang Du ZhengKuan Liu HaoRan Zheng JiXin Guo ShaoHua gong YaJun Zhu State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China Hainan National Field Science Observation and Research Observatory for Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China China-Brazil Joint Laboratory for Space Weather NSSC/INPESão Josédos Campos 12227-010Brazil School of Physics and Electronics Engineering Hainan Normal UniversityHaikou 571158China

Physical and chemical processes observed in the mesosphere and thermosphere above the Earth’s low latitudes are complex and highly interrelated to activity in the low-latitude *** sodium detected by lidar can yield clues to dynamic and chemical processes in these spatial layers above the Earth’s *** paper is based on sodium layer data collected at two low-latitude stations,one in the northern hemisphere and one in the *** low-latitude sodium layer exhibits conspicuous seasonal variations in shape,density,and altitude;these variations are similar between Earth’s hemispheres:sodium layer density at both stations reaches its seasonal maximum in autumn and minimum in ***,maximal Na density over Brazil is greater than that over *** variations of Na density above the two low-latitude stations are also similar;at both,maxima are observed before *** variations of the Na layer over Brazil that differ from those observed in the northern hemisphere may be related to the South Atlantic Magnetic Anomaly(SAMA)or fountain *** suggest that low-latitude Na layer data may provide useful additional evidence that could significantly improve the low-latitude part of the WACCM-Na model.

关键词： metallic sodium layer seasonal variation nocturnal variation lidar

Phyllosphere microbiota:Community dynamics and its interaction with plant hosts

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Journal of Integrative Plant Biology 2021年第2期63卷 297-304页

作者： Tianyu gong xiu-fang Xin National Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200032China University of the Chinese Academy of Sciences Beijing 100049China The Chinese Academy of Sciences(CAS)and CAS John Innes Centre of Excellence for Plant and Microbial Sciences Shanghai 200032China

Plants are colonized by various microorganisms in natural *** many studies have demonstrated key roles of the rhizosphere microbiota in regulating biological processes such as nutrient acquisition and resistance against abiotic and biotic challenges,less is known about the role of the phyllosphere microbiota and how it is established and *** review provides an update on current understanding of phyllosphere community assembly and the mechanisms by which plants and microbes establish the phyllosphere microbiota for plant health.

关键词： community assembly dysbiosis phyllosphere microbiota plant immunity plant–microbe interaction

CO32-对14Cr12Ni3Mo2VN不锈钢电化学腐蚀行为的影响

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CO32-对14Cr12Ni3Mo2VN不锈钢电化学腐蚀行为的影响

Laser-Induced Distortions and Disturbance Propagation of Delocalized Electronic States in Monatomic Carbon Chains

2020第七届海洋材料与腐蚀防护大会暨2020第一届钢筋混凝土耐久性与设施服役安全大会

作者：李全德冉斗孟惠民隆彬 Fu-qiang Zhai Wei-hua Guo xiu-fang gong Rong Ni Ying Jiang Xian-long gong Jun Dai 北京科技大学新材料技术研究院长寿命高温材料国家重点实验室东方汽轮机有限公司 Research Institute for New Materials Technology Chongqing University of Arts and Sciences State Key Laboratory of Long-life High Temperature Materials Dongfang Turbine Co. LTD

通过XPS、开路电位、动电位极化、交流阻抗、Mott-Schottky曲线、扫描电镜和能谱等试验方法研究了14Cr12Ni3Mo2VN马氏体不锈钢在20mmol·LNaCO溶液中的电化学腐蚀行为,分析了CO的添加对其钝化膜特性和腐蚀特性的影响。结果表明:14Cr12Ni... 详细信息

通过XPS、开路电位、动电位极化、交流阻抗、Mott-Schottky曲线、扫描电镜和能谱等试验方法研究了14Cr12Ni3Mo2VN马氏体不锈钢在20mmol·LNaCO溶液中的电化学腐蚀行为,分析了CO的添加对其钝化膜特性和腐蚀特性的影响。结果表明:14Cr12Ni3Mo2VN不锈钢在不同的测试溶液中钝化膜主要由Fe、Cr和Mo的氧化物和氢氧化物组成,CO的添加会促进钝化膜中CrO的形成及其含量的提高,但会使钝化膜中的Fe出现羟基化。CO的添加会降低14Cr12Ni3Mo2VN的自腐蚀电位和钝化膜中施主密度Nd并抑制电极表面亚稳态点蚀点的数量及活化,提高钝化膜的点蚀电位和阻抗,增加材料耐蚀性。在14Cr12Ni3Mo2VN形成稳定点腐蚀后,Fe以离子形式迁移至溶液中,而Cr、V和Mo则以氧化物或氢氧化物的形式沉积在腐蚀坑内,CO对基体中合金元素的选择性溶解和迁移过程并无明显的影响,但会显著降低再钝化电位,增加活化点蚀区域的再钝化难度。

关键词：叶片钝化电化学腐蚀

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Chinese Physics Letters 2012年第6期29卷 219-222页

作者： YANG gong-Xian gong xiu-fang School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048 Dongfang Turbine Co. LtdDeyang 618000

Tight-binding electron-ion dynamics of carbon chains pumped by intense laser pulses are performed to study the interactions between monatomic carbon chains and ***-induced distortions of carbon chains,which are enhanced by a long wavelength laser,are *** carbon chains with a strong laser beam focused on one terminal are simulated to study the disturbance of electronic *** the superposition of delocalized π band states,the disturbance propagates from the illuminated area to the non-illuminated area in a velocity ofabout 106 m/s at 0 K,and this velocity is weakened at room temperature due to the localization effect of thermal fluctuation.

关键词： pumped chains atomic

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济阳断陷湖盆层序地层学及砂砾岩油气藏群

石油学报 2003年第3期24卷 16-23页

作者：潘元林宗国洪郭玉新姜秀芳卓勤功中国石化胜利油田有限公司山东东营257000

以早第三纪始新世至渐新世的强烈块断为特征的济阳湖盆的勘探面积为 2 6× 10 4km2 ,资源发现率达到 60 % ,在 2 0世纪 90年代中期进入以岩性油藏为主的隐蔽油藏勘探阶段。应用层序地层学基本原理 ,在早第三纪湖相沙河街组和东营组划分... 详细信息

以早第三纪始新世至渐新世的强烈块断为特征的济阳湖盆的勘探面积为 2 6× 10 4km2 ,资源发现率达到 60 % ,在 2 0世纪 90年代中期进入以岩性油藏为主的隐蔽油藏勘探阶段。应用层序地层学基本原理 ,在早第三纪湖相沙河街组和东营组划分出 6个三级层序。它们具有完整的体系域构成 ,并可以进一步划分为深断陷和浅断陷两种类型。深断陷型三级层序湖扩展体系域油页岩有机质丰富 ,烃转化率高 ,是优质烃源岩。深断陷型三级层序低位体系域扇体包括浊积扇、扇三角洲等 ,它们与湖扩展体系域油页岩构成良好的生储配置 ,其含油率高达 90 %。这些扇体主要沿断裂坡折带发育 ,并且成群成带出现 ,形成砂岩隐蔽油气藏群 ,预测其远景资源量约为 10× 10 8t。近年来在济阳断陷湖盆应用“断裂坡折带低位扇成藏”理论指导勘探 ,获得了 2 3 5× 10 8t隐蔽油藏地质储量 ,且已生产原油 2 88× 10 4t。

关键词：济阳坳陷断陷湖盆三级层序扩展体系域断裂坡折带低位扇砂岩隐蔽油气藏群