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Comparative study on CO_2 corrosion behavior of N80,P110,X52 and 13Cr pipe lines in simulated stratum water

science china(Technological sciences) 2010年第9期53卷 2342-2349页

作者： CAI YiDong1,GUO PengChao1,LIU DaMeng1,CHEN ShiYu2 & LIU JunLai3 1 school of Energy Resources,china university of Geosciences,beijing 100083,china 2 school of materials science and engineering,university of science and technology beijing,beijing 100083,china 3 school of Earth sciences and Resources,china university of Geosciences,beijing 100083,china 1. school of Energy Resources China University of Geosciences Beijing 100083 China2. School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China3. School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China

To better understand the carbon dioxide (CO2) corrosion behavior of carbon steel and its influence on petroleum development (including drilling,production and transportation) in the Daqing Oilfield,CO2 corrosion behaviors of N80,P110,X52 and 13Cr pipe lines in simulated solution at high temperature and high pressure condition are investigated by dynamic corrosion experiments,scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) *** show that the corrosion rate of all pipe lines increases quickly when CO2 partial pressure increases from 0.5 to 1.5 MPa,but it slows down when CO2 partial pressure further increases from 1.5 to 4.5 MPa,during which localized corrosion is *** the experimental temperature ranges from 60 to 120°C,localized corrosion *** corrosion rate of all pipe lines decreases sharply when the temperature changes from 60 to 100°C,and it becomes stable after the temperature is higher than 100°*** the flow rate is in the range of 0–1.5 m/s,the corrosion rate of sample X52 remains unchanged,but localized corrosion gradually becomes very serious when the flow rate further *** analyzing the corrosion product scales of sample 13Cr,some remarkable phenomena are *** the temperature range of 60–100°C,the corrosion product scales are loose and thick,but become very compact when the temperature increases above 100°*** the later case,localized corrosion is *** main components of the corrosion product scales are FeCO3 and Cr2O3.

关键词： CO2 corrosion pipe lines weight loss SEM EDS

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The steady-state solution of dendritic growth from the undercooled binary alloy melt with the far field flow

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science china(Technological sciences) 2009年第8期52卷 2280-2287页

作者： CHEN MingWen1,2, WANG ZiDong2 & XU JianJun2,3,4 1 school of Applied sciences, university of science and technology beijing, beijing 100083, china 2 school of materials science and engineering, university of science and technology beijing, beijing 100083, china 3 school of Mathematical sciences, Nankai university, Tianjin 300071, china 4 Department of Mathematics and Statistics, McGill university, Montreal H3A 2K6, Canada school of Applied sciences University of Science and Technology Beijing Beijing 100083 China school of materials science and engineering University of Science and Technology Beijing Beijing 100083 China school of Mathematical sciences Nankai University Tianjin 300071 China Department of Mathematics and Statistics McGill University Montreal H3A 2K6 Canada

The steady-state dendritic growth from the undercooled binary alloy melt with the far field flow is considered. By neglecting the interface energy, interface kinetics and buoyancy effects in the system, we obtaine the steady-state solution for the case of the large Schmidt number, in terms of the multiple variable expansion method. The changes of the temperature and concentration fields, the morphology of the interface, the normalization parameter and the Peclet number of the system induced by uniform external flow are derived. The results show that, compared with the system of dendritic growth from undercooled pure melt, the convective flow in the system of growth from undercooled binary alloy has stronger effects on the morphology of the interface. Nevertheless, the shape of the interface still remains nearly a paraboloid.

关键词： binary alloy melt convection dendritic growth interfaces steady-state solution multiple variable expansion method

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The evolution and morphological stability of a spherical crystal

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science china(Technological sciences) 2008年第3期51卷 225-243页

作者： CHEN MingWen1,2, WANG ZiDong2 & XU JianJun3,4 1 school of Applied sciences, university of science and technology beijing, beijing 100083, china 2 school of materials science and engineering, university of science and technology beijing, beijing 100083, china 3 school of Mathematical sciences, Nankai university, Tianjin 300071, china 4 Department of Mathematics and Statistics, McGill university, Montreal H3A 2K6, Canada 1. school of Applied sciences University of Science and Technology Beijing Beijing 100083 China 2. school of materials science and engineering University of Science and Technology Beijing Beijing 100083 China 3. school of Mathematical sciences Nankai University Tianjin 300071 China 4. Department of Mathematics and Statistics McGill University Montreal H3A 2K6 Canada

The growth model of a spherical crystal in the undercooled melt including the surface energy, interfacial kinetics and convective flow is established. The effect of the convective flow induced by a small far field flow on the evolution and morphological stability of the interface of the spherical crystal is studied. The interface shape of the spherical crystal, which is affected by the far field flow, and the dispersion relation of the growth rate of amplitude of the perturbed interface are derived. It is shown that the convection induced by the far field flow makes the interface of the growing spherical crystal further grow in the upstream direction of the far field flow and inhibit growth in the downstream direction; the interface of the decaying spherical crystal further decays in the upstream direction and inhibits decay in the downstream direction. The theoretical result suggests that both the growth of the sphere in the upstream direction and the decay of the sphere in the downstream direction make the spherical crystal tend to evolve into an oval; the morphological stability of the interface depends on a certain radius R c such that the spherical crystal is unstable when its radius is greater than R c and stable when its radius is less than R c . The surface energy and interfacial kinetics have strong stabilizing effects on the growth of the spherical crystal. In the meantime interfacial kinetics is a table factor of the interface when the interface of the sphere is growing; it is an unstable factor of the interface when the interface is decaying.

关键词： solid-liquid interface spherical crystal convective flow crystal growth morphological stability

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Two-Sublattice Thermodynamic Model on Carbonitride Precipitation in Microalloyed Steels Bearing Nb-V-Ti

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Journal of Iron and Steel Research International 2011年第S1期18卷 271-277页

作者： XIANG Song 1,3,LIU Guo-quan 2 (1.school of materials and Metallurgy,Guizhou university,Guiyang 550003,Guizhou,china 2.school of materials science and engineering,university of science and technology,beijing,beijing 100083,china 3.The Key Laboratory for Mechanical Behavior and Microstructure of materials,Guizhou Province,Guiyang 550003,Guizhou,china) Guizhou Univ Sch Met & Mat Guiyang 550003 Guizhou Peoples R China Univ Sci & Technol beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China Key Lab Mech Behav & Microstruct Mat Guiyang 550003 Guizhou Peoples R China

Based on the two sublattice model of the regular solution,one being metal atom sublattice and another being interstitial atom sublattice,a thermodynamic model for the precipitates of niobium carbonitride,vanadium carbonitride and titanium carbonitride was established to study the starting-temperature of precipitates and the austenite compositions at given temperature in a low carbon *** calculation results show that starting-temperature of the precipitation of niobium carbonitride,vanadium carbonitride and titanium carbonitride are 1100℃,920℃ and 1340℃,respectively,the mole fraction of carbonitride precipitates is 8.65×10-4 in the 0.053C-0.0028N-1.28Mn-0.008S-0.031Al-0.046Nb-0.008Ti0.029V-Fe *** the N content is from 0.0028% to 0.0056%,the starting-temperature of the precipitation of the titanium carbonitride changes from 1340℃ to 1430℃.And the C content is from 0.053% to 0.07%,the startingtemperature of the precipitation of the titanium carbonitride hardly changes,but the atomic fraction of niobium in the carbonitride obviously increases.

关键词： microalloyed steel carbonitride precipitation two sublattice model thermodynamics

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Application of MgO-CaO Refractories in Secondary Refining Furnaces

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china's Refractories 2012年第1期21卷 11-16页

作者： GAO Xinkui1,YIN Guoxiang1,2 1 Yingkou Qinghua Refractories Co. ,Ltd. ,Dashiqiao 115100,china 2 school of materials science and engineering,university of science and technology beijing,beijing 100083,china Yingkou Qinghua Refractories Co. Ltd Dashiqiao 115100 China school of materials science and engineering University of Science and Technology Beijing Beijing 100083 China

The development status, production technology and characteristics of MgO-CaO refractories are introduced, covering MgO-CtlO clilnkers, fired MgO-CaO bricks and unburned MgO-CaO-C bricks. The applications o! MgO-CaO re... 详细信息

关键词： magnesia calcia clinkers magnesia calciabricks: magnesia calcia carbon bricks secondaU refining

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Slag Corrosion Resistance of MgO-ZrO_2 Refractories

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china's Refractories 2012年第1期21卷 17-21页

作者： YUAN Lin1,CHEN Songlin1,2,ZENG Luju1,LIU Xijun1,WU Xingsheng1,SUN Jialin2 1 Ruitai materials technology Co. Ltd. ,china Building materials Academy,beijing 100024,china 2 school of materials science and engineering,university of science and technology beijing, beijing 100083,china Ruitai materials technology Co. Ltd. China Building Materials Academy Beijing 100024 China school of materials science and engineering University of Science and Technology Beijing Beijing 100083 China

Slag corrosion resistance of MgO -ZrO2 refractories was inrestigated ill this work. The resuhs indicate that in a non-oriented electric steel slag systenl with a high ratio of ealci^t to silica, the slag resistance of MgO - ZrO, refractories can be described as flllows ： ZrO2 reacts with GtO .forming calcium zireonate compound which strengthens the material and blocks the channel of the slag infihration ; however, in an oriented electric steel slag system with a high concentration of silica and the low ratio of calcia to silica, the slag corrosion resistance ofM gO-ZrO： refractories is different ; ZrO2 reaets with CaO forming the ealcium zirconate and simultaneously one more product C2S as well; C2S cam improve corro- sion resistance by blinding pore and enhancing slag viscosity; therefore, it is expected to be the major reason for the enham＇ed corrosion resistance observed for MgO-ZrO2 refractories.

关键词： corrosion resistatlce mechanism magne-sia-zirconia brick : RH degasser

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Two-Sublattice Thermodynamic Model on Carbonitride Precipitation in Microalloyed Steels Bearing Nb-V-Ti

Two-Sublattice Thermodynamic Model on Carbonitride Precipita...

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第六届国际低合金高强度钢会议

作者： XIANG Song~(1,3),LIU Guo-quan~2 (1.school of materials and Metallurgy,Guizhou university,Guiyang 550003,Guizhou,china 2.school of materials science and engineering,university of science and technology,beijing,beijing 100083,china 3.The Key Laboratory for Mechanical Behavior and Microstructure of materials,Guizhou Province, Guiyang 550003,Guizhou,china)

Based on the two sublattice model of the regular solution,one being metal atom sublattice and another being interstitial atom sublattice,a thermodynamic model for the precipitates of niobium carbonitride,vanadium carbonitride and titanium carbonitride was established to study the starting-temperature of precipitates and the austenite compositions at given temperature in a low carbon *** calculation results show that starting-temperature of the precipitation of niobium carbonitride,vanadium carbonitride and titanium carbonitride are 1100℃,920℃and 1340℃,respectively,the mole fraction of carbonitride precipitates is 8.65×10 in the 0.053C-0.0028N-1.28Mn-0.008S-0.031Al-0.046Nb-0.008Ti- 0.029V-Fe *** the N content is from 0.0028%to 0.0056%,the starting-temperature of the precipitation of the titanium carbonitride changes from 1340℃to 1430℃.And the C content is from 0.053%to 0.07%,the starting-temperature of the precipitation of the titanium carbonitride hardly changes,but the atomic fraction of niobium in the carbonitride obviously increases.

关键词： microalloyed steel carbonitride precipitation two sublattice model thermodynamics

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高强度冷轧热镀锌用双相钢组织及性能研究

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物理测试 2009年第2期27卷 9-12页

作者：李国彬罗青赵征志唐荻北京科技大学冶金工程研究院北京100083 北京科技大学材料科学与工程学院北京100083

在实验室试制了高强度冷轧热镀锌用双相钢,并且优化了模拟连续镀锌退火工艺。利用扫描电镜(SEM)、透射电镜(TEM)以及电子背散射(EBSD)观察了双相钢组织及其微观结构,探讨了不同退火温度对双相钢力学性能和组织的影响规律。研究结果表明... 详细信息

在实验室试制了高强度冷轧热镀锌用双相钢,并且优化了模拟连续镀锌退火工艺。利用扫描电镜(SEM)、透射电镜(TEM)以及电子背散射(EBSD)观察了双相钢组织及其微观结构,探讨了不同退火温度对双相钢力学性能和组织的影响规律。研究结果表明,试制的冷轧双相钢具有高的强度和良好的延伸率,其组织主要由板条马氏体和铁素体两相组成,铁素体晶粒间多为大角度晶界,有一半以上的晶粒都是{111}∥Z型取向。

关键词：双相钢显微组织性能大角度晶界

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稀土对25CrMoVB钢组织性能的影响

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物理测试 2011年第6期29卷 1-4页

作者：刘靖姚晓乐贺景春北京科技大学材料科学与工程学院北京100083 包头钢铁集团内蒙古包头014010

在石油套管用钢25CrMoVB中加入镧+铈混合稀土,研究发现在锻造组织中,随着稀土含量增加,组织有细化均匀的趋势;在热处理后的试验钢组织中,稀土的加入使组织中出现了韧性好的下贝氏体。稀土的加入明显提高了25CrMoVB钢的常温力学性能和高... 详细信息

在石油套管用钢25CrMoVB中加入镧+铈混合稀土,研究发现在锻造组织中,随着稀土含量增加,组织有细化均匀的趋势;在热处理后的试验钢组织中,稀土的加入使组织中出现了韧性好的下贝氏体。稀土的加入明显提高了25CrMoVB钢的常温力学性能和高温屈服强度,使冲击性有所改善,特别是在常温和-80℃时,效果明显。但稀土含量过高会导致力学性能略有下降。

关键词：稀土组织力学性能 25CrMoVB钢

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Preparation of semi-solid AlSi7Mg alloy slurry with big capability

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Rare Metals 2010年第6期29卷 642-645页

作者： LI Sha and MAO Weimin school of materials science and engineering,university of science and technology beijing,beijing 100083,china school of materials science and engineering University of Science and Technology Beijing Beijing China

Semi-solid AlSi7Mg alloy slurry was prepared by low superheat pouring and weak traveling-wave electromagnetic *** effects of pouring temperature and stirring power on the microstructure of AlSi7Mg alloy slurry were *** results show that the semi-solid AlSi7Mg alloy slurry of 5 kg can be *** new technology can save energy and make the pouring process *** the pouring temperature is decreased at a stirring power of 0.41 kW,the shape of primary α-Al grains gradually changes from dendritic-like to *** the alloy melt is poured at the temperature（630°C） with a certain superheat,the pouring process becomes easier,and the spherical microstructure of AlSi7Mg alloy slurry can be prepared by the weak traveling-wave electromagnetic *** the pouring temperature is 630°C,increasing the stirring power appropriately can result in better spherical primary α-Al grains,but if the stirring power is increased to a certain value（1.72 kW）,the shape of primary α-Al grains does not obviously improve when the stirring power is continually increased.

关键词： aluminum alloys metal forming semisolid slurry electromagnetic stirring microstructure

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