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Explore the Strengthening Mechanisms of the Ultra-Low Carbon and Low Alloy steel

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Journal of iron and steel research International 2011年第S1期18卷 346-349页

作者： LIU Pan 1,2,LI Hong-mei 1,2,LIU Rong-pei 1,BAO Yao-zong 2 (1.Kunming University of Science and Technology Kunming,Yunnan 650093,china 2.central iron and steel research institute,beijing 100081,china) Kunming Univ Sci & Technol Kunming 650093 Yunnan Peoples R China Cent iron & steel Res Inst Beijing 100081 Peoples R China

Room temperature tensile tests were carried on the hot-rolled state ultra-low carbon and low alloy cabainite and martensite steels which were get by different finishing temperatures and different cooling *** used the Scanning Electron Microscopy (SEM),Electron Backscattered Diffraction (EBSD) and X-Ray Diffractometer (XRD) to identify the metallographic structure and analyse the precipitated *** inherent mechanism of high strength of ultra-low carbon and low alloy bainite and martensite steels was discussed,and the analysis indicated that the reinforcement of ultra-low carbon and low alloy bainite and martensite steels was mainly produced by the superposition of the dislocation strengthening,solution strengthening and grain refinement strengthening.

关键词： ultra-low carbon low alloy bainite martensite steel dislocation strengthening solution strengthening fine-grain strengthening precipitation strengthening

Molecular dynamics simulation of kink in 〈100〉 edge dislocation in body centred cubic iron

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Chinese Science Bulletin 2007年第16期52卷 2291-2296页

作者： CHEN LiQun1,2,WANG ChongYu2,3,4 & YU Tao2 1 College of Sciences,central South University of Forestry & Technology,Changsha 410004,china 2 central iron and steel research institute,beijing 100081,china 3 Department of Physics,Tsinghua University,beijing 100084,china 4 International Center for Materials Physics,Chinese Academy of Sciences,Shenyang 110016,china College of Sciences Central South University of Forestry and Technology Changsha 410004 China

Using the molecular dynamics method,we have constructed two kink models corresponding to the 〈100〉{010} and 〈100〉{011} edge dislocations (EDs) in body centred cubic (bcc) Fe. It is found that the geometric structure of a kink depends on the type of edge dislocation and the structural energies of the atoms sites in the dislocation core region. The formation energies,migration energies and widths of the kinks in different types of EDs are calculated. The results show that formation and migration of the kink in the 〈100〉{010} edge dislocation are difficult. The 〈100〉{011} edge dislocation moves primarily through kink nucleation,rather than kink migration.

关键词：分子动力学边缘位移铁纽结结构

The effect of hydrogen on the electronic structure of kink in bcc iron

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Science china(Technological Sciences) 2009年第5期52卷 1212-1218页

作者： CHEN LiQun1,QIU ZhengChen1,YU Tao2 & WANG ChongYu2,3,4 1 College of Sciences,central South University of Forestry and Technology,Changsha 410004,china 2 central iron and steel research institute,beijing 100081,china 3 Department of Physics,Tsinghua University,beijing 100084,china 4 International Center for Materials Physics,Chinese Academy of Sciences,Shenyang 110016,china 1. College of Sciences Central South University of Forestry and Technology Changsha 410004 China 2. central iron and steel research institute Beijing 100081 China 3. Department of Physics Tsinghua University Beijing 100084 China 4. International Center for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

The electronic structures of kinks in the [100](010) and 1/2[111](-110) edge dislocations in bcc iron containing hydrogen are investigated by means of the first-principles DMol method and the discrete variational *** effects of hydrogen on the kinks are *** results show that hydro-gen forms weak bonding states with its neighboring host atoms,and since hydrogen draws charge from its neighboring host atoms,the interactions between most of the host atoms are weakened com-pared with those of the corresponding atomic pairs in the clean *** indicates that the migration of kink,*** motion of dislocation,is easier in the doping hydrogen kink than in the clean kink,which may be the solid solution softening effect resulting from the impurity hydrogen.

关键词： electronic structure dislocation kink impurity

Novel Fe-based amorphous magnetic powder cores with ultra-low core losses

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Science china(Technological Sciences) 2010年第5期53卷 1290-1293页

作者： ZHANG Liang1,2,LI DeRen1,2,LU ZhiChao1,2,LU CaoWei1,2,LIU TianCheng1,2,GUO Feng2,LIU KaiHuang1,WANG Jun 2 & ZHOU ShaoXiong1,2 1 central iron and steel research institute,beijing 100081,china 2 Advanced Technology and Materials Co.,Ltd.,beijing 100081,china 1. central iron and steel research institute Beijing 100081 China2. Advanced Technology and Materials Co. Ltd. Beijing 100081 China

Amorphous magnetic alloy powders were prepared from bulk metallic glasses Fe74Cr2Mo2Sn2P10Si4B4C2 with supercooled liq-uid region of 32 K by water *** magnetic powder core precursor was produced from a mixture of the amorphous alloy powder with addition of insulation and bonding materials by mold compacting at room *** annealing the core precursor,the amorphous magnetic core exhibits superior magnetic properties as compared with molypermalloy powder *** initial permeability up to 1 MHz was about 80,the flux density at 300 Oe was 1.06 T and the core loss at 100 kHz for Bm=0.1 T was only 329 kW/*** ultra-low core loss is attributed to the combination of relatively high resistivity and the amorphous structure of the Fe-based amorphous *** the outstanding magnetic properties,the Fe-based amorphous magnetic powder core had a much lower cost which renders the powder cores a potential candidate for a variety of industrial applications.

关键词： Fe-based amorphous powder water atomization amorphous powder core ultra-low core loss

Liquid Structure of High Purity steel

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Liquid Structure of High Purity Steel

Study of B Microalloying steel for Base Material of Cold Rolling in CSP Line

第二届先进钢铁结构材料国际会议

作者： ZHAI Qijie~1, LUO Jun~3, ZHAO Pei~2, HU Hanqi~3(1.Shanghai University, Shanghai 200072, china 2.central iron & steel research institute, beijing 100081, china 3.University of Science and Technology beijing, beijing 100083, china)

＜正＞The liquid structure of high purity steel near the melting point has been studied with a liquid metal diffractometer. It is shown that the cluster size, coordination number, distance of the nearest neighbor atoms, and number of atoms in a cluster all decrease with increasing temperature. Small prepeaks before first main peak were found in the structure factors, and the prepeaks became slightly obscure as the temperature increases, which indicates that there exists a medium-range order structure in liquid steel and the medium-range order disappears as the temperature increases.

关键词： Liquid Structure High Purity steel X-ray Diffraction

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Study of B Microalloying Steel for Base Material of Cold Rol...

2006年薄板坯连铸连轧国际研讨会

作者： MAO Xin-ping1, HUO Xiang-dong1, ZHANG Ruo-sheng1, XU Chuan-fen1, LIU Qing-you2, CHEN Xue-wen1, YUAN Hong-xia1 (1. CSP Applying Technology research institute of GISE,Guangzhou 510730, china 2. central iron & steel research institute, beijing 100081, china)

By the technology of B microalloying, Zhujiang steel developed the base material for cold rolling SPHC, SPHD and SPHE successfully in TSCR line. The microstructure of the steel is coarsened and the st

关键词： microalloying steel B base material for cold rolling grain coarsening

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稀土多晶Ni-Mn-Ga合金磁性能的研究

稀土 2004年第3期25卷 1-4页

作者：赵增祺熊玮吴双霞刘国征黄继民王新林包头稀土研究院内蒙古包头014010 钢铁研究总院北京100081

研究了多晶Ni50Mn29Ga21-xTbx合金系列的居里温度和饱和磁化强度。结果表明,适当地添加稀土Tb在明显提高材料力学性能的同时,保持了材料的原有居里温度和饱和磁化强度基本不变。微区成份能谱分析表明,稀土Tb在材料中主要存在于晶界。晶... 详细信息

研究了多晶Ni50Mn29Ga21-xTbx合金系列的居里温度和饱和磁化强度。结果表明,适当地添加稀土Tb在明显提高材料力学性能的同时,保持了材料的原有居里温度和饱和磁化强度基本不变。微区成份能谱分析表明,稀土Tb在材料中主要存在于晶界。晶界上的Tb对材料的磁性能没有贡献,同时对晶粒内部Mn原子局域磁矩及其交换作用也没有明显的影响。

关键词： Ni-Mn-Ga合金磁性形状记忆合金磁性能

多晶Ni-Mn-Ga磁性记忆合金中间马氏体相变研究

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金属功能材料 2004年第1期11卷 9-13页

作者：赵增祺熊玮吴双霞王新林包头稀土研究院包头014010 钢铁研究总院北京100081

用内耗分析方法研究了Ni Mn Ga磁性记忆合金的相变行为。发现多晶材料也存在着由温度诱发的完整的热弹性中间马氏体相变。在发生中间马氏体相变过程中 ,内耗明显增高 ,同时 ,弹性模量发生突变 ,表明相变前和相变后材料的模量有较大的差异。

关键词：中间马氏体相变磁性记忆合金内耗 Ni-Mn-Ga 多晶材料弹性模量

research progress in non-equilibrium grain-boundary segregation and intergranular embrittlement

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Progress in Natural Science:Materials International 2006年第2期16卷 109-119页

作者： XU Tingdong (central iron & steel research institute, beijing 100081, china) [a]central iron & steel research institute Beijing China

This paper is a summary of the research progress made by the author in the study of non- equilibrium grain-boundary segregation and intergranular embrittlement during the last 20 years. Some new concepts and new model... 详细信息

关键词： grain-boundaries vacancies segregation embrittlement.