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Warm Forged Medium Carbon V Steel

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Journal of Iron and Steel research(International) 2011年第S1期18卷 822-826页

作者： Carlos Garcia-Mateo Beatriz Lopez Jose Maria Rodriguez-Ibabe materalia research group.department of physical metallurgy Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC)Avda.Gregorio del Amo 8.E-28040MadridSpain CEIT and TECNUM (University of Navarra) Po Manuel de Lardizabal 15San SebastianE-20018Basque ContrySpain

Nowadays there is a continuous demand,particularly from the automotive industry,for cheaper,lighter and more reliable *** is not surprising then that steel research has been focused during the last decades in new qualities and *** paper is dealing with the use of vanadium microalloyed steels on one of those new processes,warm *** its low precipitation temperature and its recognised ability to strengthen steel microstructures via austenite grain growth control,precipitation hardening and interference of the static recrystallization process,vanadium in microalloyed steels seem to be an appropriate candidate for warm forging.

关键词： warm forging vanadium microalloyed steels

Preparation and Metallurgical Analysis of High Activity Burnt Lime for Steelmaking

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Journal of Iron and Steel research(International) 2016年第9期23卷 884-890页

作者： Hua-qiang HAO Yu-zhu ZHANG Su-ju HAO Chao-fa ZHANG Wu-feng JIANG Peng-hui CUI College of metallurgy Northeastern University department of Long Product Tangshan Iron and Steel CompanyHebei Iron and Steel Group College of metallurgy & Energy Key Laboratory of the Ministry of Education for Modern Metallurgy TechnologyNorth China University of Science and Technology

Burnt lime is an important material in steelmaking and its activity degree is a key factor for liquid steel quality. The burnt lime was made by the calcination of limestone in a high pressure electric furnace. The burnt lime mineralogical phases and micro-morphologies were characterized by X-ray diffraction （XRD） and field emission scan- ning electron microscopy （FE-SEM）. The burnt lime activity degree was determined by acid-base titration, the burnt lime pore distribution was measured by mercury intrusion porosimetry （MIP）, and the thermal effect of a mixture of burnt lime and slag was measured by differential scanning calorimetry （DSC）. The results showed that the CaO grain size and pore size of burnt lime made under high pressure were larger than those of burnt lime made under atmos- pheric pressure. The CaO grain size and pore size increased and the laminate phenomenon also occurred clearly under high pressure. The activity degree of burnt lime made under high pressure was greater than that made under atmos- pheric pressure. The maximum activity degree was 437 mL for burnt lime made under a pressure of 0.4 MPa. For the same ratio of CaO to SiOz, the melting temperature, hemisphere temperature and fluidity temperature of slag decreased with increasing burnt lime activity degree. The higher the activity degree the burnt lime had, the better the slag forming occurred. It was advantageous for -2CaO · SiO2 and 3CaO · SiO2 forming at lower temperatures if the burnt lime activity degree was increased.

关键词： burnt lime high pressure calcination activity degree physical property slag performance

SOFC composite electrolyte based on LSGM-8282 and zirconia or doped zirconia from zircon concentrate

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International Journal of Minerals,metallurgy and Materials 2012年第9期19卷 863-871页

作者： Fitria Rahmawati Bambang Prijamboedi Syoni Soepriyanto Ismunandar Inorganic and physical Chemistry research group Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia research group of Solid State & Catalysis Chemistry Department Sebelas Maret University Jl. Ir. Sutami 36 A Kentingan Surakarta 57126 Indonesia Metallurgical Engineering research group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia

The aim of this research is to study zirconia-based electrolyte materials to increase the commercial value of zircon concentrate as a side product of fin mining industries. Synthesis of CaO-Y2O3-ZrO2 （CYZ） and 8mol% Y2O3-ZrO2 （8YSZ） was carried out by solid state reaction. The result shows that ZrO2 presents in tetragonal phase. Doping of Y203 into ZrO2 allows a phase transformation from tetragonal into cubic structure with small percentage of monoclinic phase. Meanwhile, doping of CaO-Y2O3 allows a phase transformation into a single cubic phase. These phase transformations enhance the ionic conductivity of the material. Introduction of 10wt% of LSGM-8282 into CYZ （CYZ-L90：10） allows further improvement of inter-grain contact shown by SEM morphological analysis and leads to the enhancement of ionic conductivity.

关键词： solid oxide fuel cells (SOFC) solid electrolytes LSGM electrolyte zirconia phase transformations ionic conductivity

ANTIMONY GRAIN BOUNDARY SEGREGATION AND ITS SUPPRESSION BY CERIUM IN Fe-2%Mn-Sb STRUCTURAL STEELS

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Acta Metallurgica Sinica(English Letters) 2003年第3期16卷 175-182页

作者： Z.X.Yuan A.M.Guo J.Liu D.D.Shen J.Jia S.H.Song School of Materials and metallurgy Wuhan University of Science and Technology Wuhan 430081 ChinaResearch Institute of Wuhan Iron and Steel Company Wuhan 430080 ChinaSchool of Materials and Metallurgy Wuhan University of Science and Technology Wuhan 430081 ChinaSchool of Materials and Metallurgy Wuhan University of Science and Technology Wuhan 430081 ChinaSchool of Materials and Metallurgy Wuhan University of Science and Technology Wuhan 430081 ChinaSchool of Materiajs and MetallurgyWuhan University of Science and Technology Wuhan 430081 China Materials GroupDepartment of Mechanical EngineeringBrunel Uliversity Uxbridge Middlesex UBS 3PHUK

Antimony grain boundary segregation in Fe-2%Mn-Sb structure steels has been studied through measurements of the ductile-brittle transition temperature in conjunction with scanning electron microscopy, Auger electron spectroscopy and secondary ion mass spectroscopy. The research result reveals that during tempering or ageing after quenching at 980℃, Sb segregates to grain boundaries with both equilibrium and non-equilibrium natures and brings about temper embrittlement in the steels. Cerium can relieve temper embrittlement of the steels and its segregation to grain boundaries may play an important role in reducing this embrittlement.

关键词： segregation grain boundary rare-earth embrittlement

Coexistence of plastic and partially diffusive phases in a helium-methane compound

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National Science Review 2020年第10期7卷 1540-1547页

作者： Hao Gao Cong Liu Andreas Hermann Richard J.Needs Chris J.Pickard Hui-Tian Wang Dingyu Xing Jian Sun National Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Advanced MicrostructuresNanjing University Centre for Science at Extreme Conditions and The School of Physics and Astronomy The University of Edinburgh Theory of Condensed Matter group Cavendish Laboratory department of Materials Science & metallurgy University of Cambridge Advanced Institute for Materials research Tohoku University

Helium and methane are major components of giant icy planets and are abundant in the universe. However,helium is the most inert element in the periodic table and methane is one of the most hydrophobic molecules, thus whether they can react with each other is of fundamental importance. Here, our crystal structure searches and first-principles calculations predict that a He;CH;compound is stable over a wide range of pressures from 55 to 155 GPa and a HeCH;compound becomes stable around 105 GPa. As nice examples of pure van der Waals crystals, the insertion of helium atoms changes the original packing of pure methane molecules and also largely hinders the polymerization of methane at higher pressures. After analyzing the diffusive properties during the melting of He;CH;at high pressure and high temperature, in addition to a plastic methane phase, we have discovered an unusual phase which exhibits coexistence of diffusive helium and plastic methane. In addition, the range of the diffusive behavior within the helium-methane phase diagram is found to be much narrower compared to that of previously predicted helium-water compounds. This may be due to the weaker van der Waals interactions between methane molecules compared to those in helium-water compounds, and that the helium-methane compound melts more easily.

关键词： crystal structure prediction ab initio molecular dynamics ab initio calculations high pressure and high temperature melting and phase transition collective motion

Recent progress and perspectives in additive manufacturing of magnesium alloys

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Journal of Magnesium and Alloys 2022年第6期10卷 1511-1541页

作者： Zhuoran Zeng Mojtaba Salehi Alexander Kopp Shiwei Xu Marco Esmaily Nick Birbilis College of Engineering and Computer Science Australian National UniversityACT.2601 Australia Additive Manufacturing group Singapore Institute of Manufacturing Technology(SIMTech)Agency forScienceTechnology and Research(A∗STAR)73 Nanyang Drive637662 Singapore Meotec GmbH Philipsstr.8AachenGermany State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsh1410082 China department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139United States of America Volvo Materials Technology Laboratory Volvo GroupLundbyGothenburg 41715Sweden

Magnesium alloys remain critical in the context of light-weighting and advanced devices. The increased utilisation of magnesium(Mg)each year reveals growing demand for its Mg-based alloys. Additive manufacturing(AM) provides the possibility to directly manufacture components in net-shape, providing new possibilities and applications for the use of Mg-alloys, and new prospects in the utilisation of novel physical structures made possible from ‘3D printing’. The review herein seeks to holistically explore the additive manufacturing of Mg-alloys to date, including a synopsis of processes used and properties measured(with a comparison to conventionally prepared Mg-alloys). The challenges and possibilities of AM Mg-alloys are critically elaborated for the field of mechanical metallurgy.

关键词： Magnesium Additive manufacturing Microstructure 3D printing Mechanical properties Electrochemical properties

The Application of Cold Banding Technology for Dust Removed From BOF Gas Using Dry Dedusting Technology

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Meteorological and Environmental research 2015年第1期6卷 14-16页

作者： Tang Weijun Zhang Yong Ma Gangping Technology research Center of Beijing Steel and metallurgy Energy Saving Engineering Beijing Metallurgical Equipment research & Design Corporation Limited of MCC group Energy &Environment Protection department Shougang Group

Firstly, physical and chemical properties of dust removed from BOF gas are analyzed, and then the cold banding technology of dust removed from BOF gas and its application are introduced. Tests have proved that using cooled agglomerated pellets made of the dust removed from BOF gas and small amounts of modified starch as a coolant and slagging agent in steel production can bring about considerable economic, social and environmental benefits.

关键词： BOF gas Dust removed from BOF gas using dry dedusting technology Cold banding Steelmaking China

Revealing and exploiting hierarchical material structure through complex atomic networks

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npj Computational Materials 2017年第1期3卷 163-170页

作者： Sebastian E.Ahnert William P.Grant Chris J.Pickard Theory of Condensed Matter group Cavendish LaboratoryUniversity of CambridgeJJ Thomson AvenueCambridge CB30HEUK Sainsbury Laboratory University of CambridgeBateman StreetCambridge CB21LRUK department of Materials Science&metallurgy University of Cambridge27 Charles Babbage RoadCambridge CB30FSUK Advanced Institute for Materials research Tohoku University 2-1-1 KatahiraAobaSendai 980-8577Japan

One of the great challenges of modern science is to faithfully model,and understand,matter at a wide range of *** with atoms,the vastness of the space of possible configurations poses a formidable challenge to any simulation of complex atomic and molecular *** introduce a computational method to reduce the complexity of atomic configuration space by systematically recognising hierarchical levels of atomic structure,and identifying the individual *** a list of atomic coordinates,a network is generated based on the distances between the *** the technique of modularity optimisation,the network is decomposed into *** procedure can be performed at different resolution levels,leading to a decomposition of the system at different scales,from which hierarchical structure can be *** considering the amount of information required to represent a given modular decomposition we can furthermore find the most succinct descriptions of a given atomic *** straightforward,automatic and general approach is applied to complex crystal *** show that modular decomposition of these structures considerably simplifies configuration space,which in turn can be used in discovery of novel crystal structures,and opens up a pathway towards accelerated molecular dynamics of complex atomic *** power of this approach is demonstrated by the identification of a possible allotrope of boron containing 56 atoms in the primitive unit cell,which we uncover using an accelerated structure search,based on a modular decomposition of a known dense phase of boron,γ-B_(28).

关键词： structure atomic complex

Reaction mechanisms for 0.5Li_2MnO_3 ·0.5LiMn_(0.5)Ni_(0.5)O_2 precursor prepared by low-heating solid state reaction

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International Journal of Minerals,metallurgy and Materials 2012年第9期19卷 856-862页

作者： Dong Li Fang Lian Xin-mei Hou Kuo-chih Chou School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China department of physical Chemisitry University of Science and Technology Beijing Beijing 100083 China

Lithium-excess manganese layered oxides, which are commonly described in chemical formula 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2, were prepared by low-heating solid state reaction. The reaction mechanisms of synthesizing precursors, the decomposition mechanism, and intermediate materials in calcination were investigated by means of Fourier transform infrared spectroscopy （FT-IR）, X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM）, thermogravimetric analysis （TGA）, and differential scanning calorimetry （DSC）. The major diffraction patterns of 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2 powder calcinated at 720℃ for 15 h are indexed to the hexagonal structure with a space group of R3m, and the clear splits of doublets at （006）/（102） and （108）/（110） indicate that the sample adopts a well-layered structure. FESEM images show that the size of the agglomerated particles of the sample ranges from 100 to 300 nm.

关键词： lithium batteries electrode manganese oxide solid state reactions calcination