检索结果-南通市图书馆

Journal of Materials Science & Technology 2011年第8期27卷 746-752页

作者： Lei Shi Jiuchun Yan Yanfei Han Bo Peng State Key Laboratory of Advanced Welding and Joining School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

The joint interface between semi-solid Zn-Al filler metal and SiC p /Al composites with applying vibration for different time was examined. With increasing vibrating time, the oxide layer was disrupted prior at the centre to the periphery of the interface. And the solid grains near the centre of interface in semi-solid filler metal aggregated into two solid regions and compressed the composites during vibration; the solid grains near the periphery of interface moved toward the edge and scraped the composites during vibration. The models of disrupting oxide layer under the vibration condition were developed. At the centre of interface, the oxide layer was tore and stripped during the solid grains in the semi-solid filler metal depressing the composites with a very high compressive stress. At the periphery of interface, the oxide layer was cut and stripped into the filler metal during the solid grains scraping the interface.

关键词： SiCP/Al composites Brazing oxide layer Semi-solid state

The Development of Hot Rolled Automobile Beam Steel Plates 500L-Z With Excellent Surface oxide layer

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2011年第S1期18卷 999-1003页

作者： SHI Xiao-guang,HAN Bin,XU Xin,DONG Yi,LIU Ren-dong (An Gang Steel Co Ltd,Anshan 114001,Liaoning,China) An Gang Steel Co Ltd Anshan 114001 Liaoning Peoples R China

This paper has determined the compositions and hot rolling processes of the hot rolled beam steel plates with excellent surface oxide layer for automobiles by investigating the oxide layer forming principle and its influence factors,and the feature of the steel oxide layer.The microstructure,mechanical properties,oxide layer shape and structural composition of the steel plates are analyzed by using metallographic structures examination,SEM analyzing,X-ray diffraction instrument and mechanical properties testing.The result shows that the trial hot rolled frame steel plates have an excellent oxide layer adhesion,the Fe 3 O 4 proportions is greater than 85% in the oxide layer,and the oxide layer thickness is less than or equal to 10μm.The product has been trial-manufactured more than 100 thousands ton,and used to stamp the beam parts of automobiles straightly in no pickling process.The oxide layer scarcely scales off from the steel plates,and the effect is remarkable.

关键词： automobile beam 500L-Z Fe 3 O 4 oxide layer

EFFECT OF oxide layer THICKNESS OVER Al AND Al ALLOY POWDERS ON QUALITY OF THEIR EXPLOSIVE COMPACTS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1993年第7期6卷 25-28页

作者： ZHANG Dengxia MA Chenghui CAI Ming Institute of Mechanics,Academia Sinica,Beijing,ChinaAI Baoren ZHANC Jinyuan ZHU Ruizhen LIU Chunlan Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,Beijing,China Associate Professor,Institute of Mechanics,Academia Sinica,Beijing 100080,China

Observations of microstructure of explosive compacts made of Al or Al-Li alloy powders by atomization with water,nitrogen or ultrasoic Ar gas were carried out under optical and scanning electron microscopes.The rsults indicate that super quality explosive compact can only be obtained by powders of which the thickness of the oxide layer is less than 30 nm.

关键词： Al powder Al-Li alloy powder explosive compact oxide layer

Oxidation Behaviors of Different Grades of Ferritic Heat Resistant Steels in High-Temperature Steam and Flue Gas Environments

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1103-1116页

作者： Xiaogang Li Qu Liu Shanlin Li Yu Zhang Zhipeng Cai Kejian Li Jiluan Pan Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Collaborative Innovation Center of Advanced Nuclear Energy Technology Tsinghua UniversityBeijing 100084China

For steam tubes used in thermal power plant,the inner and outer walls were operated in high-temperature steam and flue gas environments respectively.In this study,structure,microstructure and chemical composition of oxide films on inner and outer walls of exservice low Cr ferritic steel G102 tube and exservice high Cr ferritic steel T91 tube were analyzed.The oxide film was composed of outer oxide layer,inner oxide layer and internal oxidation zone.The outer oxide layer on the original surface of tube had a porous structure containing Fe oxides formed by diffusion and oxidation of Fe.More specially,the outer oxide layer formed in flue gas environment would mix with coal combustion products during the growth process.The inner oxide layer below the original surface of tube was made of Fe–Cr spinel.The internal oxidation zone was believed to be the precursor stage of inner oxide layer.The formation of internal oxidation zone was due to O diffusing along grain boundaries to form oxide.There were Fe–Cr–Si oxides discontinuously distributed along grain boundaries in the internal oxidation zone of G102,while there were Fe–Cr oxides continuously distributed along grain boundaries in that of T91.

关键词： Ferritic heat resistant steels High temperature service oxide layer Steam Flue gas Oxidation evolution

Understanding on corrosion mechanism of oxidized AZW800 alloy in 3.5 wt%NaCl solution

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2023年第5期11卷 1740-1753页

作者： Chunlong Cheng Qichi Le Liang Chen Wenxin Hu Tong Wang Baosong Zhu Xiong Zhou Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China Baotou Research Institute of Rare Earths Baotou 014000China

Magnesium alloys are more widely used at higher temperatures.However,it is not well known whether oxide layer,produced at high temperature,could show corrosion protection.Thus,the corrosion behaviors of oxidized AZW800 alloy were investigated by hydrogen evolution and electrochemical measurements to evaluate effect of oxide layer on corrosion resistance.The results showed that corrosion of removed oxide layer AZW800 alloy showed characteristic of localized corrosion,leaving randomly bulky pits.While reserved oxide layer AZW800 alloy exhibited a relatively uniform corrosion.The results indicated that oxide layer could hinder corrosion of oxidized AZW800 alloy in the initial period of immersion.While subsequently,aggravated corrosion would occur owing to defects of oxide layer and less protective products film.Besides,present of oxide layer eliminated micro-galvanic couple on alloy surface.The synergistic effect of elimination of micro-galvanic couple on alloy surface and alkalization effect transforms localized corrosion into relatively uniform corrosion of alloys.

关键词： AZW800 Corrosion behavior oxide layer EIS

The Coupled Thermo-Chemo-Mechanical Peridynamics for ZrB_(2) Ceramics Ablation Behavior

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2023年第4期135卷 417-439页

作者： Yuanzhe Li Qiwen Liu Lisheng Liu Hai Mei Department of Engineering Structure and Mechanics Wuhan University of TechnologyWuhan430070China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of TechnologyWuhan430070China

The ablation of ultra-high-temperature ceramics(UTHCs)is a complex physicochemical process including mechanical behavior,temperature effect,and chemical reactions.In order to realize the structural optimization and functional design of ultra-high temperature ceramics,a coupled thermo-chemo-mechanical bond-based peridynamics(PD)model is proposed based on the ZrB_(2) ceramics oxidation kinetics model and coupled thermomechanical bond-based peridynamics.Compared with the traditional coupled thermo-mechanical model,the proposedmodel considers the influenceof chemical reactionprocessonthe ablation resistanceof ceramicmaterials.In order to verify the reliability of the proposed model,the thermo-mechanical coupling model,damage model and oxidation kinetic model are established respectively to investigate the applicability of the proposedmodel proposed in dealing with thermo-mechanical coupling,crack propagation,and chemical reaction,and the results show that the model is reliable.Finally,the coupled thermo-mechanical model and coupled thermo-chemo-mechanical model are used to simulate the crack propagation process of the plate under the thermal shock load,and the results show that the oxide layer plays a good role in preventing heat transfer and protecting the internal materials.Based on the PD fully coupled thermo-mechanical model,this paper innovatively introduces the oxidation kinetic model to analyze the influence of parameter changes caused by oxide layer growth and chemical growth strain on the thermal protection ability of ceramics.The proposed model provides an effective simulation technology for the structural design of UTHCs.

关键词： ZrB_(2)ceramics ablation coupled thermo-chemo-mechanic peridynamics model oxide layer

Influence factors of capacity loss after short-time standing of metal-hydride electrode and its EIS model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2013年第8期31卷 772-777页

作者：王倩楠晁栋梁周万海陈云贵吴朝玲 College of Materials Science and Engineering Sichuan University

Considerable irreversible capacity loss was observed after the electrode standing at small state-of-charge （SOC） for only a short term. Influence of SOC, standing time and the replacement elements of LaNis-type hydrogen storage alloys to standing was discussed. Charge-transfer resistance, exchange current density （I0）, and hydrogen diffusion coefficient were determined based on the study of electrochemical impedance spectrum （EIS）, linear polarization （LP） and constant potential step （CPS）, respectively. The oxi- dation of metal Ni on the alloy surface after standing was responsible for the rapid deterioration of capacity, charge-transfer resistance and I0. Galvanostatic, LP, EIS and CPS measurements suggested the presence of an oxide and/or corrosion layer on the alloy surface of raw material and electrode after standing at 0% SOC for 2 d. It was proved that the first small semicircle in high-frequency region of EIS was related to this layer. Novel EIS model in metal hydride electrode was proposed accordingly.

关键词： metal-hydride electrode standing oxide layer EIS model rare earths

Oxidation resistance of nickel-based superalloy Inconel 600 in air at different temperatures

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第11期40卷 3235-3240页

作者： Dong-Sheng Li Guang Chen Dan Li Qi Zheng Pei Gao Ling-Ling Zhang School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China

Inconel 600 alloy is widely utilized for high temperature environment application due to the corresponding good oxidation and corrosion resistance properties.In order to estimate the high temperature oxidation resistance of Inconel 600 alloy at various temperatures,the oxidation weight gain of all specimens was measured and fitted for the curve at the temperatures of 700,800 and 900 ℃ for exposure time of 100 h.The surface morphology and the component of the oxide film were analyzed by scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS) and X-ray diffraction(XRD).The results indicate that the high temperature oxidation resistance of Inconel 600 alloy is excellent blew 800℃ due to the oxidation kinetic curves at different temperatures corresponding to the parabola dynamic rules.This means that the oxidation film protects the substrate well.The dense oxide layer formation containing Cr_(2)O_(3) and NiCr_(2)O_(4) at 700 and 800 ℃ and MnCr_(2)O_(4) at 900 ℃,respectively,is the main reason for the good oxidation resistance.In contrast,the oxide layer peels off easily under applied force as the temperature increases beyond 800℃, on account of the complicated compositions of the oxide film and the binding force between the oxide layer and the substrate weakening.Corresponding oxidation mechanism is expected to be understood and the oxidation resistance of Inconel 600 alloy is improved through binding force enhancement.

关键词： Inconel 600 alloy High temperature oxidation oxide layer Oxidation mechanism

Effect of yttrium modification on the corrosion behavior of AZ63 magnesium alloy in sodium chloride solution

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2021年第2期9卷 613-626页

作者： Jiarun Li Zhuoyuan Chen Jiangping Jing Jian Hou Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of Sciences7 Nanhai RoadQingdao 266071China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteWenhai RoadQingdao 266237China Center for Ocean Mega-Science Chinese Academy of Sciences7 Nanhai RoadQingdao 266071China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)No.1 Wenhai RoadQingdao 266237China

The microstructures and corrosion behaviors of Mg-6%Al-3%Zn and Mg-6%Al-3%Zn-(0.251.0)%Y in 3.5 wt.%Na Cl solution are investigated via morphology observation,phase characterization,immersion and electrochemical methods.The experimental results suggest that yttrium alloying can improve the corrosion resistance of Mg-6%Al-3%Zn throughout the immersion.The initial enhanced corrosion resistance of magnesium alloy is attributed to the Y alloying,which gives rise to the increasing content of Al_(2)O_(3)in oxide layer.The promoted protectiveness of oxide layer on Mg-6%Al-3%Zn-1.0%Y alloy arouse a filiform corrosion as revealed by in-situ metallographic observation.Furthermore,the Y-containing magnesium alloys still perform higher corrosion resistance compared with that of Mg-6%Al-3%Zn alloy even if the oxide layer is exhausted.This phenomenon is owing to two factors,one is the gradual transformation of intermetallic phases from continuous Mg_(17)Al_(12)to discrete Al_(2)Y in matrix,by which the micro-galvanic corrosion betweenα-Mg grains and intermetallic phases is alleviated;the other is the morphology variation of corrosion products,the uniform and compact products layer on Y-containing alloys provide a barrier that effectively prevent the corrosive ions from penetrating into and reacting with Mg matrix.

关键词： Magnesium Yttrium alloying Corrosion Intermetallic phase oxide layer

Effect of Ti addition on high-temperature oxidation behavior of Co-Ni-based superalloy

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2020年第10期27卷 1179-1189页

作者： Ying-xin Zhu Chong Li Yong-chang Liu Zong-qing Ma Hong-yao Yu State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science and EngineeringTianjin UniversityTianjin 300354China Central Iron&Steel Research Institute Beijing 100081China Beijing CISRI-GAONA Materials&Technology Co. Ltd.Beijing 100081China

The oxidation behavior of a newly designed Co-Ni-based alloy with varied addition of Ti(1.4 and 2.1 wt.%,hereafterreferred as 1.4Ti and 2.1Ti alloys)was explored in air at 900℃.It is found that an outer oxide layer composed of CoO,anintermediate oxide layer composed of intermittent TiO,plus continuous Cr,W-rich oxides,and an inner oxidized regioncomposed of Al2O3 were formed on the surface of 1.4Ti alloy,whereas the oxide structure of 2.1Ti alloy was composed of Co0 as the outer oxide layer,continuous TiO2,Cr2O3 and WO3 as intermediate oxide layer,and Al2O3 as the inner oxidizedregion.With increasing Ti content.continuous TiO2 films formed in the intermediate oxide layer,which would lead to theformation of compact Cr2O3 and improved oxidation resistancc after 100 h oxidation at 900℃.These observations indicatedthat Ti addition can improve the high-temperature oxidation resistance of Co-Ni-based aloys.

关键词： Oxidation Co-Ni-based superalloy Ti addition oxide layer