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The development and Application of Modern Nb Microalloyed Ferritic Stainless Steel

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The Development and Application of Modern Nb Microalloyed Fe...

Light weighting opportunities and material choice for commercial vehicle frame structures from a design point of view

第十届中国钢铁年会暨第六届宝钢学术年会

作者： Zhang Wei Mariana oliveira Guo Aimin CITIC-CBMM Microalloying Technology Center Xinyuan Nanlu companhia brasileira de metalurgia e minera??o

Ferritic stainless steel is being paid attention by steel industry and downstream users relying on its good over-all properties and low cost. With improvement of metallurgical technology and researching on fundamental theory, further development is obtained in properties optimization and quality stabilization of modern ferritic stainless steel, its marked feature are super purification and Nb/Nb-Ti stabilization. Nowadays, modern ferritic stainless steel is used widely in auto industry, home appliances, solar water heater, construction and decoration fields. The paper focuses on the effect mechanism of Nb technology on modern ferritic stainless steel and summarizes its application progress in typical downstream industries in China. Nb has an important role in the development of the ferritic stainless steel family since it adds value by improving final properties such as formability, weldability and corrosion resistance. home appliance and solar water heater are more open to ferritic stainless steel applications since they are volume driven and more cost ***-bearing modern ferritic stainless steels will have a bright application future in home appliance, solar water heater and other fields.

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Advances in Manufacturing 2015年第1期3卷 19-26页

作者： Peter Seyfried ed Juarez Mendes Taiss Alexandre Costa Calijorne Fei-Peng Li Qi-Feng Song Hamburg University of Applied Sciences Hamburg Germany companhia brasileira de metalurgia e mineracao Villa NovaMGBrazil Caltra Projetos & Consultoria Belo HorizonteMGBrazil Dongfeng Commercial Vehicle Technology Center FAW Technology Center

This paper focuses on an estimation of light weighting opportunities for the frame structure of com- mercial road vehicles. This estimation is based on simpli- fied static load cases which play a predominant role for the dimensioning of a frame structure and therefore these simplifications are not putting the general validity of the conclusions into question. A comparison of different ma- terials under this scenario shows that light metals do not show any weight reduction advantage in comparison to steel while a material-independent topology optimization has more weight reduction potential for the frame structure than a simple change of materials. Considering the con- straints of part complexity which is directly linked with production and assembly cost, the ladder frame structure has become the current state of the art design. Thus the paper also puts a spotlight on basic rules of node design and vertical load induction in order to keep the weight of such a design as low as possible. Practical examples from manufacturers show that the weight of a commercial vehicle could be reduced by 10%, and main parts of the frame structure could be reduced by 30% using high strength steel in combination with innovative production methods like roll forming.

关键词： Ladder frame . Light weighting.Commercialvehicle .Node design - High strength steel - Profilesection . Vertical bending .Topology optimization

electrochemical and spectroscopic study of interfacial interactions between chalcopyrite and typical flotation process reagents

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International Journal of minerals,Metallurgy and Materials 2016年第2期23卷 127-136页

作者： Gustavo Urbano Isabel Lázaro Israel Rodríguez Juan Luis Reyes Roxana Larios Roel Cruz Instituto de metalurgia Universidad Autonotrla de San Luis PotosiAvSierra Leona 550Lomas 2a SeccionSan Luis PotosiS.L.P.78210Mexico Industrial minera Mexico S.A.de C.V. San Luis PotosiS.L.P.Mexico Centro Universitario de Ciencias exactas e Ingenierias Universidad de GuadalajaraGuadalajaraJaliscoMexico

Comparative voltammetry and differential double-layer capacitance studies were performed to evaluate interfacial interactions between cnalcopyrite（CuFeS2） and n-isopropyl xanthate（X） in the presence of ammonium bisulfite/39wt%So2 and caustic starch at different pH *** spectroscopy,Fourier transform infrared（FTIR） spectroscopy,contact angle measurements,and microflotation tests were used to establish the type and extent of xanthate adsorption as well as the species involved under different mineral surface conditions in this *** results demonstrate that the species that favor a greater hydrophobicity of chalcopyrite are primarily CuX and S^0,whereas oxides and hydroxides of Cu and Fe as well as an excess of starch decrease the hydrophobicity.A conditioning of the mineral surface with ammonium bisulfite/39wt%So2 at pH 6 promotes the activation of surface and enhances the xanthate ***,this effect is diminished at pH ≥ 8,when an excess of starch is added during the preconditioning step.

关键词： sulfide minerals chalcopyrite xanthates flotation interfacial reactions electrochemistry spectroscopy

高铌X80管道不同强度匹配环焊接头性能及应变演化

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焊接学报 2022年第2期43卷 34-39,I0004页

作者：何小东高雄雄 David Han 池强霍春勇 JoséB Bacalhau 中国石油集团石油管工程技术研究院石油管材及装备材料服役行为与结构安全国家重点实验室西安710077 国际焊接研究中心西安710077 companhia brasileira de metalurgia e mineração Sao Paulo04538-133Brazil

为探究管道环焊缝断裂失效机理,测试了两种不同强度匹配的高铌X80环焊缝接头的组织和性能,并借助数字图像相关法(digital image correlation, DIC)观测了焊接接头在拉伸载荷下的应变行为.结果表明,低强匹配和高强匹配的高铌X80管道环焊... 详细信息

为探究管道环焊缝断裂失效机理,测试了两种不同强度匹配的高铌X80环焊缝接头的组织和性能,并借助数字图像相关法(digital image correlation, DIC)观测了焊接接头在拉伸载荷下的应变行为.结果表明,低强匹配和高强匹配的高铌X80管道环焊接头均具有较好的冲击韧性,二者的夏比冲击吸收能量平均值相当,热影响区韧性离散主要是粗晶区组织不均匀性所致;高铌X80管线钢碳当量CeIIW较低,环焊缝接头热影响区存在一定程度软化.在轴向拉伸载荷下,无论是低强匹配还是高强匹配,应变集中最先出现在环焊缝的根焊和热影响区部位.随着拉伸载荷的增加,高强匹配环焊缝接头的应变集中逐渐从根焊和热影响区转移到母材,管道承受轴向载荷和变形的能力大于低强匹配环焊接头;而对于低强匹配,因在焊缝和热影响区产生塑性应变累积,即使具有较好的韧性,环焊接头也会发生断裂.

关键词：强度匹配高铌X80管道环焊缝应变累积数字图像相关法

Consolidation of AA 7075-2 wt% Zro2 Composite Powders by Severe Plastic deformation via eCAP

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Acta Metallurgica Sinica(english Letters) 2016年第10期29卷 895-901页

作者： S. e. Hernandez-Martinez J. J. Cruz-Rivera R. Martinez-Sanchez C. G. Garay-Reyes J. A. Mufioz-Bolanos J. M. Cabrera J.L.Hernández-Rivera Instituto de metalurgia Universidad Autonoma de San Luis Potosi Sierra Leona 550 78210 San Luis Potosi Mexico Centro de Investigacion en Materiales Avanzados (CIMAV) Miguel de Cervantes 120 31109 Chihuahua Mexico departamento de Ciencia de Materiales e Ingenieria Metalurgica Universitat Politecnica de Catalunya Av Diagonal 647 08028 Barcelona Spain Fundacion CTM Centro Tecnologico Plaza de la Ciencia 208243 Manresa Spain CoNACYT Research Fellow-Instituto de metalurgia Universidad Autonoma de San Luis Potosi- Sierra Leona 550 78210 San Luis Potosf Mexico

The powders of the AA 7075-ZRo2 were mixed by mechanical milling, but it was found that the system presents a few disadvantages when processed by conventional sintering and hot extrusion, since intermetallic phases between Zro2 particles and alloying elements were formed. equal channel angular pressing （eCAP） processing was proposed as an alternative method to consolidate the composite where there is no intermetallic formation. The analysis of the eCAP process showed that the intermediate temperature （220℃） produced a higher consolidation level than conventional sintering and hot extrusion （400 and 500℃, respectively）. This fact was supported by relative density analysis. In the case of the sintered and hot-extruded sample, the relative density exhibited a value of 0.95, while eCAP sample showed a value of 0.98. Hardness values show that microstructural refinement obtained during mechanical milling was preserved during eCAP processing even when it was carded out at 220℃.

关键词： Metal matrix composites (MMCs) Powder consolidation Severe plastic deformation (SPD)

Characterization of yttria-stabilized zirconia films deposited by dip-coating on La_(0.7)Sr_(0.3)Mno_(3) substrate:Influence of synthesis parameters

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Journal of Advanced Ceramics 2013年第1期2卷 55-62页

作者： Jacqueline C.MARReRo Nielson F.P.RIBeIRo Célia F.MALFATTI Mariana M.V.M.SoUZA escola de Química-Universidade Federal do Rio de Janeiro(UFRJ) Centro de TecnologiaBloco Esala 206Ilha do FundãoCEP 21941-909Rio de JaneiroRJBrazil departamento de metalurgia Universidade Federal do Rio Grande do Sul(UFRGS)Campus do ValeSetor 4Prédio 75Sala 234CEP 91501-970Porto AlegreRSBrazil

Yttria-stabilized zirconia(YSZ,Zro_(2)-8%Y2o_(3))films were deposited onto lanthanum strontium manganite(LSM,La_(0.7)Sr_(0.3)Mno_(3))substrates using dip-coating process aiming for the application in solid oxide fuel cells(SoFCs).YSZ precursor was prepared by sol-gel method;three values of the organic/inorganic concentration ratio(1,3 and 5)were utilized and the sol viscosity was adjusted(60 mPa·s and 100 mPa·s)before deposition on the *** influence of these synthesis parameters on the structure and morphology of the deposited films was examined by X-ray diffraction(XRD)and scanning electron microscopy(SeM).The films showed characteristic peaks of LSM,YSZ(with cubic structure)and secondary phases of SrZro_(3) and La_(2)o_(3).depending on the synthesis conditions,crack-free,homogeneous and well adhered films were obtained,with thickness of 11-24μm.

关键词： YSZ films LSM sol-gel dip-coating

Mixed-conducting ceramic–carbonate membranes exhibiting high Co2/o2 permeation flux and stability at high temperatures

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Journal of Advanced Ceramics 2020年第1期9卷 94-106页

作者： R.oRTeGA-LUGo J.A.FABIAN-ANGUIANo o.oVALLe-eNCINIA C.GoMeZ-YANeZ B.H.ZeIFeRT J.oRTIZ-LANdeRoS Instituto Politécnico Nacional Escuela Superior de Ingeniería Química e Industrias ExtractivasDepartamento de Ingeniería en Metalurgia y MaterialesUPALM-ZacatencoMexico City 07738Mexico Chemical engineering School for engineering of Matter Transport and EnergyArizona State UniversityTempeAZ 85287-6106USA

This investigation demonstrates the feasibility to fabricate high quality ceramic–carbonate membranes based on mixed-conducting ***,it is reported the simultaneous Co2/o2 permeation and stability properties of membranes constituted by a combination of ceramic and carbonate phases,wherein the microstructure of the ceramic part is composed,in turn,of a mixture of fluorite and perovskite *** ceramics showed ionic and electronic conduction,and at the operation temperature,the carbonate phase of the membranes is in liquid state,which allows the transport of Co32-and o2–species via different *** fabricate the membranes,the ceramic powders were uniaxially pressed in a disk ***,an incipient sintering treatment was carried out in such a way that a highly porous ceramic was ***,the piece is densified by the infiltration of molten *** of the membranes was accomplished by SeM,XRD,and gas permeation techniques among *** and chemical stability under an atmosphere rich in Co2 was ***2/o2 permeation and long-term stability measurements were conducted between 850 and 940℃.The best permeation–separation performance of membranes of about 1 mm thickness,showed a maximum permeance flux of about 4.46×10^–7 mol·m^–2·s^–1·Pa^–1 for Co2 and 2.18×10^–7 mol·m^–2·s^–1·Pa^–1 for o2 at 940℃.Membranes exhibited separation factor values of 150–991 and 49–511 for Co2/N2 and o2/N2 respectively in the studied temperature *** long-term stability test showed certain microstructural changes in the membranes,no significant detriment on the permeation properties was observed along 100 h of continuous operation.

关键词： Co2 separation o2 separation ceramic–carbonate membrane selectivity

Feasibility Study of a Hydro PV Hybrid System operating at a Dam for Water Supply in Southern Brazil

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Journal of Power and energy engineering 2015年第9期3卷 70-83页

作者： Luis e.Teixeira Johan Caux Alexandre Beluco Ivo Bertoldo JoséAntonio S.Louzada Ricardo C.eifler Instituto de Pesquisas Hidráulicas Universidade Federal do Rio Grande do SulPorto AlegreBrazil ecole Nationale Superieure de l’energie l’Eau et l’EnvironnementGrenoble INPGrenobleFrance companhia Riograndense de Saneamento Santa MariaBrazil companhia estadual de energia elétrica Salto do JacuíBrazil

Dams for water supply usually represent an untapped hydroelectric potential. It is a small energetic potential, in most situations, usually requiring a particular solution to be viable. The use of pumps as power turbines often represents an alternative that enables the power generation in hydraulic structures already in operation, as is the case of dams in water supply systems. This potential can be exploited in conjunction with the implementation of PV modules on the water surface, installed on floating structures, both operating in a hydro PV hybrid system. The floating structure can also contribute to reducing the evaporation of water and providing a small increase in hydroelectric power available. This paper presents a pre-feasibility study for implementation of a hydroelectric power plant and PV modules on floating structures in the reservoir formed by the dam of Val de Serra, in southern Brazil. The dam is operated to provide drinking water to about 60% of the population of the city of Santa Maria, in the state of Rio Grande do Sul, in southern Brazil. The pre-feasibility study conducted with Homer software, version Legacy, indicated that the hydroelectric plant with a capacity of 227 kW can operate together with 60 kW of PV modules. This combination will result (in one of the configurations considered) in an initial cost of USD$ 1715.83 per kW installed and a cost of energy of USD$ 0.059/kWh.

关键词： Hydro PV Hybrid System PV Floating Cover Water Supply Dam Software Homer

Siting Study of Solar Thermoelectric Plants in the State of Minas Gerais

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Journal of Geographic Information System 2014年第5期6卷 423-439页

作者： Chigueru Tiba Ruibran Januario dos Reis Reis Julio Cesar ezequiel da Costa Veronica Wilma Bezerra Azevedo Joao Francisco Abreu Melina Amoni Silveira Alves Daniel Pereira Guimaraes Marco Aurelio Dumont Porto Nuclear energy department Federal University of PernambucoRecifeBrazil Programa de Pos-Graduacao em Geografia PUCBelo HorizonteBrazil companhia energetica de Minas Gerais Belo HorizonteBrazil embrapa Milho e Sorgo Sete LagoasBrazil

The generation of heliothermal electricity has received increasing attention throughout the world in countries such as Spain, the USA, Germany and many others. In Brazil, this type of energy generation in the form of large projects (above 80 MW) remains unexplored. However, it is known that in the country, there are extensive areas of normal direct irradiation with high intensity and a low seasonality factor, especially in the semiarid regions in Brazil, mainly the North and Northeast of Minas Gerais. Moreover, these Minas Gerais regions have other significant characteristics for the installation of these plants: proximity to transmission lines, flatness, the fact that the respective vegetation is not endangered, a suitable land use profile (availability of land not used in agriculture), low wind speed, low population density, and, most recently, an increase in the demand for local electric energy due to the economic growth above the Brazilian average rate. Furthermore, the introduction of solar plants in that region, due to its distributed nature, will bring development and growth to the region (normally poor) by generating employment and income. This article presents a study of the optimal location of thermoelectric plants in the semiarid regions of Minas Gerais, conducted with Geographical Information System (GIS) technology. GIS consists of a set of specialised resources that allow the manipulation of spatial data, bringing efficiency and agility in the identification of suitable places for the installation of solar plants, while simultaneously enabling the consideration of future scenarios for energy planning, with its respective impact, costs and benefits. The study has identified very promising solar irradiation levels for the electric generation by solar energy, whether thermoelectric or photovoltaic, reaching an annual solar irradiation of 2700 kWh/m2 in the summer and in the range of 2200 - 2400 kWh/m2 on an annual basis. This area includes a vast region i

关键词： Solar energy Thermoelectric Solar Plant Geographical Information System Promising Regions in the Minas Gerais