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Effect of Cr on Characteristic of Rust Layer Formed on Low Alloy Steel in Flow-accelerated Corrosion Environment

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Journal of Iron and Steel Research International 2016年第6期23卷 602-607页

作者： Feng CHAI Shan JIANG Cai-fu YANG department of Engineering steels Central Iron and Steel Research Insititute

The flow-accelerated corrosion experiments were carried out to research the effect of Cr on the rust layers formed on the carbon steel and Cr-containing steel,as well as the structure of rust layer of the two experimental *** influence of Cr on the flow-accelerated corrosion resistance and the corrosion morphology of inner rust layer formed on the Cr-containing steel were studied by the methods of polarization curves,scanning electron microscope,transmission electron microscope,and X-ray photoelectron *** distribution of Cr and its form of existence in the inner rust layer were *** results show that corroded mass loss of Cr-containing steel is lower than that of carbon steel and its inner rust layer is *** exists in the form of Fe2CrO4 and is enriched in the inner rust *** concentration could make the inner rust layer exhibit the tendency of *** phenomenon is related to fine *** inner rust layer becomes more compact because of the formation of fine Fe2CrO4,and the protectiveness of inner rust layer could be improved remarkably.

关键词： accelerated photoelectron amorphous remarkably steels finer enriched cathodic hence attributed

Control of Secondary Phases by Solution Treatment in a N-Alloyed High-Mn Cryogenic Steel

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Acta Metallurgica Sinica(English Letters) 2018年第10期31卷 1059-1072页

作者： Xiao-Jiang Wang Xin-Jun Sun Cheng Song Shuai Tong Luo-Jin Liu Huan Chen Wei Han Feng Pan department of Materials Science and Engineering Tsinghua University department of Structural steels Central Iron and Steel Research Institute

The secondary phases of the steels have significant effects on the microstructure and mechanical properties, making controlling these secondary phases important. The control of MnS inclusions and A1N precipitates in a N-alloyed high-Mn twin-induced plastic cryogenic steel via solution treatment was investigated with several different techniques including microstructural characterization, 298 K tensile testing, and 77 K impact testing. The solutionizing temperature （ST） increased from 1323 to 1573 K, where the elongated MnS inclusions and large-sized AlN precipitates became spheroidized and dissolved. The aspect ratio of the MnS inclusions decreased as the ST increased and the number density increased. The impact toughness of the steels showed anisotropy and low impact energy values, due to the elongated MnS inclusions and large-sized AIN precipitates. The anisotropy was eliminated by spheroidizing the MnS inclusions. The impact energy was improved by dissolving the large-sized AlN precipitates during the solution treatment. The austenite grain size increased when the dissolution of the AlN precipitate increased, but the effect of the grain size on the yield strength, toughness, and the strength--ductility balance was weak.

关键词： Cryogenic Solutionizing temperature Low-temperature toughness Spheroidize Dissolution

Strengthening and toughening mechanism of a Cu-bearing high-strength low-alloy steel with refined tempered martensite/bainite(M/B)matrix and minor inter-critical ferrite

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Journal of Iron and Steel Research International 2021年第4期28卷 464-478页

作者： Fei Zhu Feng Chai Xiao-bing Luo Zheng-yan Zhang Cai-fu Yang department of Structural steels Central Iron and Steel Research InstituteBeijing 100081China

The microstructure–mechanical property relationship of a Cu-bearing low-carbon high-strength low-alloy steel,subjected to a novel multistage heat treatment including quenching(Q),lamellarization(L)and tempering(T),is *** strength of 989.5 MPa and average toughness at-80℃of 41 J were obtained in this steel after quenching and tempering(QT)heat *** QLT gained a little lower yield strength(982.5 MPa),but greatly enhanced average toughness at-80℃(137 J).To further clarify the strengthening and toughening mechanisms in specimen QLT,parameters of microstructural characteristic and crack propagation process were compared and analyzed for specimens Q,QL,QT and *** microstructure of tempered martensite/bainite(M/B)in specimen QT changed to refined tempered M/B matrix mixed with minor IF(inter-critical ferrite)in specimen ***-rich precipitates existed in tempered M/B for both specimens QT and QLT,as well as in *** with QT,adding a lamellarization step before tempering made the effective grains of specimen QLT refined and also led to coarser Cu-rich precipitates in tempered M/B *** weaker strengthening effect of coarser Cu-rich precipitates should be a key reason for the slightly lower yield strength in specimen QLT than in specimen *** austenite was found in all specimens Q,QL,QT and *** QLT showed purely ductile fracture mode at-80℃due to the refined effective *** greatly improved toughness is mainly attributed to the enhanced energy of crack *** combination of refined microstructure,softened matrix and deformation of minor'soft'IF during crack propagation led to the most superior toughness of specimen QLT among all specimens.

关键词： High-strength low-alloy steel Multistage heat treatment Low-temperature toughness Strengthening mechanism Grain refinement Crack propagation

Effect of dissolved niobium on eutectoid transformation behavior

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Journal of Iron and Steel Research International 2017年第9期24卷 973-978页

作者： Qi-long Yong Zheng-yan Zhang Xin-jun Sun Jian-chun Cao Zhao-dong Li department of Structural steels Central Iron and Steel Research Institute department of Materials Science and Engineering Kunming University of Science and Technology

The effect of dissolved niobium on the eutectoid transformation behavior in near-eutectoid high-carbon steels has been *** niobium is important in the eutectoid transformation *** increases the eutectoid carbon content significantly（by^0.0477% per 0.00001% dissolved niobium）,increases the hardenability of steel markedly,yields finer,more uniform,polygonal proeutectoid ferrite,induces a transition in morphology of eutectoid cementite from lamellar to somewhat spheroidal,and increases the misorientation angle of pearlite colonies from being focused near 0°to near 60°.

关键词： Niobium High carbon steel Eutectoid transformation Pearlite

Microstructure and Mechanical Properties of Precipitation Strengthened Fire Resistant Steel Containing High Nb and Low Mo

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Journal of Iron and Steel Research International 2015年第4期22卷 337-343页

作者： Zheng-yan ZHANG Qi-long YONG Xin-jun SUN Zhao-dong LI Jun-yu KANG Guo-dong WANG department of Structural steels Central Iron and Steel Research Institute State Key Laboratory of Rolling and Automation Northeastern University

Through the thermo-mechanical control process （TMCP）, a high Nb low Mo fire resistant steel with the yield strength （YS） of 521 MPa at room temperature （RT） and 360 MPa at elevated temperature （ET） of 600 ℃ was developed based on MX （M=Nb, V, Mo; X=C,N） precipitation strengthening. A series of tensile and con- stant load tests were conducted to study the mechanical properties at ET. The dynamic continuous cooling transfor- mation （CCT） as well as precipitation behavior of microalloy carbonitride was investigated by means of thermal sim- ulator and electron microscopy approaches. Results showed that the failure temperature of tested steel was deter- mined as 653 ℃, and the granular bainite was obtained when the cooling rate was higher than 10 ℃/s. In the rolled state, a certain amount of M/A islands was observed. During heating from RT to ET, M/A islands disappeared, and cementites and high dense compound precipitates （Nb, Mo, V）C with size of less than 10 nm precipitated in ferrite at ET （600 ℃）, which resulted in precipitation strengthening at ET.

关键词： fire resistant steel elevated temperature property microalloying granular bainite precipitation strengthening

Structural, electrical, and optical properties of ZnInO alloy thin films

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Chinese Physics B 2011年第10期20卷 340-344页

作者：才玺坤原子健朱夏明王雄张兵坡邱东江吴惠桢 department of Physics State Key Laboratory of Silicon Materials Zhejiang University

Indium zinc oxide （IZO） thin films with different percentages of In content （In/[In＋Zn]） are synthesized on glass substrates by magnetron sputtering, and the structural, electrical and optical properties of IZO thin films deposited at different In2O3 target powers are investigated. IZO thin films grown at different In2O3 target sputtering powers show evident morphological variation and different grain sizes. As the In2O3 sputtering power rises, the grain size becomes larger and electrical mobility increases. The film grown with an In2O3 target power of 100 W displays the highest electrical mobility of 13.5 cm.V-1-s-1 and the lowest resistivity of 2.4× 10^-3 Ω.cm. The average optical transmittance of the IZO thin film in the visible region reaches 80% and the band gap broadens with the increase of In2O3 target power, which is attributed to the increase in carrier concentration and is in accordance with Burstein-Moss shift theory.

关键词： indium-zinc oxide magnetron sputtering In content optical properties electrical prop-erties

Effects of annealing process on characteristics of fully transparent zinc tin oxide thin-film transistor

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Chinese Physics B 2014年第2期23卷 364-368页

作者：陈勇跃王雄才玺坤原子健朱夏明邱东江吴惠桢 department of Physics State Key Laboratory of Silicon MaterialsZhejiang University

Annealing effect on the performance of fully transparent thin-film transistor （TTFT）, in which zinc tin oxide （ZnSnO） is used as the channel material and SiO2 as the gate insulator, is investigated. The ZnSnO active layer is deposited by radio frequency magnetron sputtering while a SiO2 gate insulator is formed by plasma-enhanced chemical vapor deposition. The saturation field-effect mobility and on/off ratio of the TTFT are improved by low temperature annealing in vacuum. Maximum saturation field-effect mobility and on/off ratio of 56.2 cm2/（V.s） and 3×10^5 are obtained, respectively. The transfer characteristics of the ZnSnO TPT are simulated using an analytical model and good agreement between measured and the calculated transfer characteristics is demonstrated.

关键词： zinc tin oxide thin-film transistors mobility annealing

Room-temperature electroluminescence of p-Zn_xMg_(1-x)O:Na/n-ZnO p-n junction light emitting diode

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Journal of Semiconductors 2009年第8期30卷 1-3页

作者：叶志镇张利强黄靖云张银珠朱丽萍吕斌吕建国汪雷金一政蒋杰薛雅张俊林时胜杨丹 State Key Laboratory of silicon Materials Department of MaterialsZhejiang University

p-ZnxMg1-xO：Na/n-ZnO p-n junction light emitting diode （LED） was produced on n-ZnO （0001） single-crystal substrate using pulsed laser deposition. The realization of band gap engineering was achieved by the incor-poration of Mg in ZnO layers and was confirmed by photoluminescence spectrum. The p-type ZnxMg1-xO：Na film with low resistance was obtained at 500 ℃ and in which, Na has taken effect evidenced by Hall and X-ray photo-electron spectroscopy measurements. The current-voltage curve of LED showed a rectifying behavior and obvious electroluminescence was realized by feeding a direct current up to 40 mA. Furthermore, its structural and electric characters are discussed as well.

关键词： ZnO electroluminescence Na doped LED

First-principles study of the influences of oxygen defects upon the electronic properties of Nb-doped TiO_2 by GGA + U methods

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Chinese Physics B 2014年第5期23卷 453-460页

作者：宋晨路杨振辉苏婷王慷慨王菊刘涌韩高荣 State Key Laboratory of silicon Materials and department of Materials Science and Engineering Zhejiang University

The influence of oxygen defects upon the electronic properties of Nb-doped TiO2 has been studied by using the general gradient approximation （GGA）＋U method. Four independent models （i.e., an undoped anatase cell, an anatase cell with a Nb dopant at Ti site （NbTi）, an anatase cell with a Nb-dopant and an oxygen vacancy （NbTi＋Vo）, and an anatase cell with a Nb-dopant and an interstitial oxygen （NbTi＋Oi）） were considered. The density of states, effective mass, Bader charge, charge density, and electron localization function were calcul^ited. The results show that in the NbTi＋Vo cell both eg and t2g levels of Ti 3d orbits make contributions to the electronic conductivity, and the oxygen vacancies （Vo） collaborate with Nb-dopants to favor the high electrical conductivity by inducing the Nb-dopants to release more excess charges. In NbTi＋Oi, an unoccupied impurity level appears in the band gap, which served as an acceptor level and suppressed the electronic conductivity. The results qualitatively coincide with experimental results and possibly provide insights into the preparation of TCOs with desirable conductivity.

关键词： TiO2 oxygen defects excess charges GGA+U method