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Corrosion Behavior of Low-Alloy Pipeline Steel with 1% Cr Under CO_2 Condition

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Acta Metallurgica Sinica(English Letters) 2015年第6期28卷 739-747页

作者： Zhen-Guang Liu xiu-Hua gao Chi Yu Lin-xiu Du Jian-Ping Li Ping-Ju Hao The State Key Lab of Rolling and Automation Northeastern University School of Resource and Material Northeastern University at Qinhuangdao Mechanical and Electrical Engineering Shijiazhuang Vocational College for Scientific and Technical Engineering

Carbon dioxide corrosion behavior of low-alloy pipeline steel with 1% Cr exposed to CO2-saturated solution was investigated by immersion experiment. SEM, EDX, TEM, EPMA and XRD were utilized to investigate the microstructure, corrosion morphologies, corrosion phases and elements distribution of corrosion scale. The results demon strate that the microstructure of tested steel consists of ferrite and carbides. During the corrosion process, ferrite dissolves preferentially, leaving carbide particles behind. The residual carbide particles may promote the nucleation of FeCO3 crystal. The phase comprising of the inner layer is Cr compound, and the one of the outer layer is FeCO3. The formation process of corrosion scale can be illustrated as follows： Firstly, a thin scale consisting of thin inner layer and outer layer is formed, which represents poor corrosion resistance; then, the inner layer changes little, once it has been formed, and the outer layer becomes thick and compact, which demonstrates that a fine corrosion resistance is obtained. The chemical elements of chromium and molybdenum accumulate in the inner layer of corrosion scale. The corrosion behavior of low- alloy steel based on microstructure and morphology characterization is also discussed.

关键词： Carbon dioxide Low-alloy steel Corrosion behavior Microstructure

Preparation and Field Emission Properties of Titanium Polysulfide Nanobelt Films

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Nano Research 2009年第7期2卷 558-564页

作者： Xing Cai Wu You Rong Tao Qi xiu gao School of Chemistry and Chemical Engineering and Key Laboratory of Mesoscopic Chemistry of Ministry of EducationNanjingUniversityNanjing 210093China

TiS_(3) nanobelt films,with widths of about 0.112μm,thickness of about 20250 nm,and lengths of up to 200μm,have been grown on Ti substrates by a surface-assisted chemical-vapor-transport at 450°C for 8 *** TiS_(3) nanobelt films were converted into TiS_(1.71) nanobelt films by pyrolysis in a vacuum at 600°C for 2 *** work functions of the two films were determined by ultraviolet photoelectron spectroscopy measurements to be 4.60 and 4.44 eV,*** field emission experiments using the nanostructures as cold electron cathodes showed that both materials gave significant emission *** turn-on fields(defined as the electric field required to produce a current density of 10μA/cm^(2))were about 1.0 and 0.9 V/μm,respectively,whereas the threshold fields(defined as the electric field required to produce a current density of 1 mA/cm^(2))were about 5.6 and 4.0 V/μm,*** data reveal that both materials have potential applications in field emission devices.

关键词： Nanowire film titanium sulfide chemical vapor-transport field emission

Controllable synthesis of a large TS-1 catalyst for clean epoxidation of a C=C double bond under mild conditions

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Frontiers of Chemical Science and Engineering 2023年第6期17卷 772-783页

作者： xiu gao Beining Luo Yanping Hong Peihang He Zedong Zhang Guoqiang Wu Jiangxi Key Laboratory of Natural Products and Functional Food Jiangxi Agricultural UniversityNanchang 330045China School of Food Science and Engineering Jiangxi Agricultural UniversityNanchang 330045China

Development of a titanium silicalite-1(TS-1)catalyst with good crystallinity and a four-coordinate Ti framework is critical for efficient catalytic oxidation reaction under mild ***,a size-controlled TS-1 zeolite(TS-10.1ACh(acetylcholine))was synthesized via steam-assisted crystallization by introducing acetylcholine as a crystal growth modifier in the preparation process,and TS-10.1ACh was also employed in epoxidations of different substrates containing C=C double *** crystalline sizes of the as-synthesized TS-10.1ACh catalysts were controlled with the acetylcholine content,and characterization results showed that the particle sizes of highly crystalline TS-10.1ACh zeolite reached 3.0μm with a good Ti *** the synthetic process,the growth rate of the crystals was accelerated by electrostatic interactions between the connected hydroxyl groups of the acetylcholine modifier and the negatively charged skeleton of the ***,the TS-10.1ACh catalyst demonstrated maximum catalytic activity,good selectivity and high stability during epoxidation of allyl ***,the TS-10.1ACh catalyst was also highly versatile and effective with different unsaturated *** findings may provide novel,easily separable and large TS-1 catalysts for efficient and clean industrial epoxidations of C=C double bonds.

关键词： size-controlled TS-1 crystal modifier steam-assisted crystallization epoxidation

Dynamic and Static Recrystallization Behavior of Low Carbon High Niobium Microalloyed Steel

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Journal of Iron and Steel Research International 2011年第1期18卷 55-60页

作者： LAN Liang yun QIU Chun lin ZHAO De-wen gao xiu hua DU Lin-xiu State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The recrystallization behavior of a low carbon high niobium microalloyed steel was investigated using continuous and interrupted hot compression tests. The results showed that the initiation of dynamic recrystallization （DRX） could be detected from inflection in the plot of the strain hardening rate against stress regardless of the stress peak appearance. According to the Zener-Hollomon parameter equation, the activity energy of DRX （Qad） was ob tained and a new modified expression calculating Qdef was proposed in consideration of the chemical composition of experimental steel. Applying the 2% offset method, the static softening fraction was determined. The graphic representation of the softening fraction vs interruption time gave the information about the non-static reerystallization temperature （about 1 000℃ ） and the relationship of precipitation time temperature. Static recrystallization kinetics followed the Avrami＇s law at high deformation temperature, and different values of the exponent m were given to illustrate the effect of niobium element on static recrystallization at different deformation temperatures.

关键词： dynamic recrystallization static recrystallization high niobium microalloyed steel activity energy

Hydrogen trapping and electrochemical corrosion behavior of V–N microalloyed X80 pipeline steels consisting of acicular ferrite and polygonal ferrite

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Journal of Iron and Steel Research International 2022年第10期29卷 1683-1693页

作者： Ming-ming Wang xiu-hua gao Li-ying Song Cheng-lin Zhu Lin-xiu Du Raja Devesh Kumar Misra State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX79968USA

Hydrogen trapping behavior of V–N microalloyed X80 pipeline steels was studied by means of hydrogen permeation and hydrogen induced cracking(HIC)*** addition,the electrochemical performance of the steels in 3.5 wt.%NaCl solution was *** indicated that the microstructure of experimental steels mainly consisted of acicular ferrite and polygonal ferrite(PF).When the fraction of PF was 9.1%and 30.4%,hydrogen effective diffusion coefficient was 1.624×10^(−6) and 3.121×10^(−6) cm^(2)/s,*** pipeline steels were not susceptible to *** potential hydrogen traps distributed in homogeneous dispersion were conducive to high HIC *** increasing the fraction of PF from 9.1%to 30.4%,the corrosion current density increased from 5.39×10^(−6) to 9.49×10^(−6) A cm^(−2),the corrosion potential decreased from−0.48 to−0.57 V,and the charge transfer resistance decreased from 2301 to 2068Ωcm^(2),*** fraction of PF was disadvantageous for corrosion resistance because of galvanic corrosion.

关键词： Pipeline steel V-N microalloying Hydrogen induced cracking susceptibility Hydrogen permeation Electrochemical corrosion

Structure-property relationships in heat-affected zone of gas-shielded arc-welded V-N microalloyed steel

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Journal of Iron and Steel Research International 2018年第12期25卷 1244-1254页

作者： Jun Hu Lin-xiu Du Bin Zhang Xiang-yu Qi xiu-hua gao R.D.K.Misra The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl Paso TX 79968-0521USA

The structure-property relationship in heat-affected zone (HAZ)of a low-carbon steel bearing V-N subjected to gasshielded arc welding was *** microstructural characteristics of base metal (BM),coarse-grained HAZ (CGHAZ),fine-grained HAZ,and intercritical HAZ were significantly *** effect of grain-refinement strengthening and transformation hardening on HAZ contributed to equivalent hardness of 260.8-278.5 HV in comparison with BM hardness of 272.0 ***,excellent impact toughness at -20 ℃ was obtained because of high resistance to crack propagation by high-misorientation boundaries,leading to impact fracture consisting of *** CGHAZ,free N was partly fixed by V(C,N)precipitates,such that the deterioration effect of N on toughness was considered to be nearly *** comparison with CGHAZ,weld metal contained higher fraction of acicular ferrite with fine plates,while the impact toughness was inferior because of the detrimental influence of coarse inclusions from the welding *** nanoscale V(C,N)precipitates in CGHAZ had weak effect on toughness because of small size.

关键词： V-N microalloying Heat-affected zone Acicular ferrite Hardness Toughness Gas-shielded arc welding V-N microalloyed steel

Existing Regions of Either Rarefactive or Compressive Solitary Waves for Particular Dusty Plasma

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Communications in Theoretical Physics 2008年第2期49卷 482-484页

作者： gao xiu-Yun LIN Mai-Mai DUAN Wen-Shan College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China

By deriving a Korteweg-de Vries （KdV） equation for particular dusty plasma, we find the existing regions of solitary waves. The regions of both rarefactive and compressive solitary waves have also been given in this... 详细信息

关键词： dust acoustic solitary waves KdV equation

Positive psychological intervention for anxiety, depression and coping in subjects addicted to online games

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World Journal of Clinical Cases 2021年第14期9卷 3287-3293页

作者： xiu-Jun gao Ji-Jun Sun Mei Xiang Department of Psychiatry Hangzhou Seventh People’s HospitalHangzhou 310013Zhejiang ProvinceChina Department of Elderly Psychiatry Hangzhou Seventh People’s HospitalHangzhou 310013Zhejiang ProvinceChina

BACKGROUND Addiction to online games is not *** patients usually refuse to take medications and present with affective symptoms such as anxiety,depression and negative coping *** intervention based on positive psychology is a promising treatment for such *** To evaluate the effect of positive psychological intervention on anxiety,depression and coping in people addicted to online *** This self-controlled study included 89 people addicted to online games,who received treatment at Hangzhou Seventh People’s Hospital,Hangzhou,China in *** Hamilton Anxiety Scale,Hamilton Depression Scale and Trait Coping Style Questionnaire were administered to evaluate the anxiety,depression and coping style among these *** intervention based on positive psychology was provided for 6 wk followed by another *** results were compared against those from the previous *** After 6 wk of psychological intervention,89 people achieved a significant improvement in the Hamilton Anxiety Scale and Hamilton Depression Scale-24 *** score for positive coping style in Trait Coping Style Questionnaire was significantly improved,while that of the negative coping style decreased significantly(P<0.05).CONCLUSION Psychological intervention based on positive psychology alleviated affective symptoms,such as anxiety and depression,in subjects addicted to online *** intervention corrected negative coping style,thereby improving mental health.

关键词： Online game addiction Positive psychology Anxiety Depression Coping style Psychological intervention

Linear Integral Analysis of Bar Rough Rolling by Strain Rate Vector

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Journal of Iron and Steel Research International 2010年第3期17卷 28-33页

作者： DENG Wei ZHAO De-wen QIN Xiao-mei gao xiu-hua DU Lin-xiu LIU Xiang-hua State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

A new linear integral method for bar hot rolling on roughing train was obtained. First, for plastic deformation energy rate, equivalent strain rate about Kobayashi＇s three-dimensional velocity field was expressed by two-dimensional strain rate vector; then, the two-dimensional strain rate vector was inverted into inner product and was integrated term by term. During those processes, boundary equation and mean value theorem were introduced; for friction and shear energy dissipation rate, definite integral was applied to the solution process. Sequentially, the total upper bound power was minimized, and the analytical expressions of rolling torque, separating force, and stress state factor were obtained. The calculated results by these expressions were compared with those of experimental values. The results show that the new linear integral method is available for bar rough rolling analysis and the calculated results by this method are a little higher than those of experimental ones. However, the maximum error between them is less than 10%.

关键词： bar rough rolling linear integration strain rate vector roll separating force