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Hydrogen storage and low-temperature electrochemical performances of A2B7 type La-Mg-Ni-Co-Al-Mo alloys

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Progress in Natural Science:Materials International 2017年第2期27卷 169-176页

作者： Jianguang Yuan Wei Li Ying Wu China Iron & steel Research Institute group Advanced Technology & Materials Co.Ltd

The effect of Mo-addition on hydrogen storage and low-temperature electrochemical performances of La-MgNi-Co-Al alloys is investigated. The alloys were synthetized via vacuum induction melting followed by annealing treatment at 1123 K for 8 h. The major phases in the annealed alloys are consisted of（La, Mg）2Ni7,（La,Mg）5Ni19and LaNi5phases. Mo-addition facilitates phase transformation of LaNi5into（La, Mg）2Ni7and（La,Mg）5Ni19phases. Hydrogen absorption/desorption PCI curves indicates that the hydrogen storage capacity of the alloy increases remarkably with the addition of Mo. Furthermore, the La0.75Mg0.25Ni3.05Co_(0.2Al0.05Mo0.2alloy shows excellent hydriding/dehydriding kinetics with a higher capacity, requiring only 100 s to reach its saturated hydrogen capacity of 1.58 wt% at low temperature of 303 K, and releasing 1.57 wt% hydrogen within400 s at 338 K. Electrochemical experiments manifest that the Mo-added alloy electrode has perfect activation properties and the maximum discharge capacity. The low-temperature dischargeability shows that the La0.75Mg0.25Ni3.05Co0.2Al0.05Mo0.2alloy exhibits the excellent low-temperature discharge performance, and the maximum discharge capacity is improved from 231.0 to 334.6 m Ah/g at 253 K. The HRD property of the alloy electrode is enhanced, suggesting that Mo enhances the kinetic ability at low-temperature.

关键词： La-Mg-Ni alloy Mo-addition Hydrogen storage property Electrochemical property Low-temperature

Antioxidant and Anti-aging Activities of Silybum Marianum Protein Hydrolysate in Mice Treated with D-galactose

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Biomedical and Environmental Sciences 2017年第9期30卷 623-631页

作者： ZHU Shu Yun JIANG Ning TU Jie YANG Jing ZHOU Yue School of Food and Biological Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina jiangsuHengshun group Co.Ltd. Zhenjiang 212000JiangsuChina Institute of Vegetables Jiangsu Academy ofAgricultural SciencesNanjing 210014JiangsuChina College of Biotechnology Jiangsu University of Scienceand TechnologyZhenjiang 212018JiangsuChina

Objective In the present study, we investigated the antioxidant and anti‐aging effects of Silybum marianum protein hydrolysate（SMPH） in D‐galactose‐treated mice. Methods D‐galactose（500 mg/kg body weight） was intraperitoneally injected daily for 7 weeks to accelerate aging, and SMPH（400, 800, 1,200 mg/kg body weight, respectively） was simultaneously administered orally. The antioxidant and anti‐aging effects of SMPH in the liver and brain were measured by biochemical assays. Transmission electron microscopy（TEM） was performed to study the ultrastructure of liver mitochondria. Results SMPH decreased triglyceride and cholesterol levels in the D‐galactose‐treated mice. It significantly elevated the activities of superoxide dismutase（SOD） and glutathione peroxidase（GSH‐Px）, and total antioxidant capacity（T‐AOC）, which were suppressed by D‐galactose. Monoamine oxidase（MAO） and malondialdehyde（MDA） levels as well as the concentrations of caspase‐3 and 8‐OHd G in the liver and brain were significantly reduced by SMPH. Moreover, it increased Bcl‐2 levels in the liver and brain. Furthermore, SMPH significantly attenuated D‐galactose‐induced liver mitochondrial dysfunction by improving the activities of Na＋‐K＋‐ATPase and Ca2＋‐Mg2＋‐ATPase as well as mitochondrial membrane potential（ΔΨm） and fluidity. TEM showed that the degree of liver mitochondrial damage was significantly decreased by SMPH. Conclusion The results indicated that SMPH protects against D‐galactose‐induced accelerated aging in mice through its antioxidant and anti‐aging activities.

关键词： Silybum marianum protein hydrolysate Antioxidant Anti‐aging D‐galactose

Strengthening pelletization of manganese ore fines containing high combined water by high pressure roll grinding and optimized temperature elevation system

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Journal of Central South University 2014年第9期21卷 3485-3491页

作者：朱德庆余为周仙霖潘建 School of Minerals Processing and Bioengineering Central South University Wuhan Iron and steel (group) CORP

Pelletization is one of useful processes for the agglomeration of iron ore or concentrates. However, manganese ore fines are mainly agglomerated by sintering due to its high combined water which adversely affects the roasting performance of pellets. In this work, high pressure roll grinding(HPRG) process and optimization of temperature elevation system were investigated to improve the strength of fired manganese ore pellets. It is shown that the manganese ore possesses good ballability after being pretreated by HPRG twice, and good green balls were produced under the conditions of blending 2.0% bentonite in the feed, balling for 7 min at 16.00% moisture. High quality roasted pellets with the compressive strength of 2711 N per pellet were manufactured through preheating at 1050 °C for 10 min and firing at 1335 °C for 15 min by controlling the cracks formation. The fired manganese pellets keep the strength by the solid interconnection of recrystallized pyrolusite grains and the binding of manganite liquid phase which filled the pores and clearance among minerals. The product pellets contain high Mn grade and low impurities, and can be used to smelt ferromanganese, which provides a possible way to use imported manganese ore fines containing high combined water to produce high value ferromanganese.

关键词： manganese ore fines containing high combined water pelletization high pressure roll grinding optimized temperatureelevation system consolidation mechanism

Corrosion Resistance on High Strength Bainitic steel and 09CuPCrNi After Wet-Dry Cyclic Conditions

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Journal of Iron and steel Research International 2013年第2期20卷 72-78页

作者： WANG Zhi-fen YIN Fu-xing WU Li-xin SUN Yi-qiang ZHANG Wan-lin Research and Development Center Wuhan Iron and Steel (Group) Corporation National Institute for Materials Science

The accelerated wet-dry cyclic corrosion tests have been carried out of a high strength bainitic steel and 09CuPCrNi. The results indicated that the corrosion resistance of 09CuPCrNi was better than that of the bainitic steel based on the mass loss measurements. The morphology and composition of the rusting products have been investigated in order to realize the mechanism of rust formation on the two steels. The rust scale on both steels was composed of a dense inner layer and a loose outer layer. The inner layer grew thicker and denser as the test proceeding. Both of inner and outer layers were mainly composed of magnetite （Fe3O4） and maghemite （γ-Fe2O3） with a small amount of lepidocrocite （γ-FeOOH） and akaganeite （β-FeOOH）. The rust phase of γ-Fe2O3 was detected in a higher amount of the inner layer, resulting in a much denser inner layer. The inner rust layer of 09CuPCrNi being denser and thicker than that of the high strength bainitic steel was attributed to the alloying elements such as copper, chromium and phosphorus enriched in it. The protective inner rust layer plays an important role in the corrosion resistance of the steel.

关键词： high strength bainitic steel 09CuPCrNi rust layer corrosion resistance

Microstructural evolution and performance of hydrogen storage and electrochemistry of Co-added La0.75Mg0.25Ni3.5-xCox（x=0,0.2,0.5 at%） alloys

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Progress in Natural Science:Materials International 2017年第4期27卷 424-429页

作者： Wei Lv Yufan Shi Wanpeng Deng Jianguang Yuan Youhua Yan Ying Wu China Iron & steel Research Institute group Advanced Technology & Materials Co. Ltd

Microstructure, hydrogen storage and electrochemical performances of Co-added La0.75Mg0.25Ni3.5xCox（x = 0,0.2, 0.5 at%） alloys are studied. XRD and rietveld refinement results suggest that the samples are mainly composed of（LaMg）Ni3,（LaMg）2Ni7and LaNi5phases, Co substitution for Ni changes the phase abundance,but not the phase composition. With the rising of Co content, the amount of（LaMg）2Ni7phase decreases, but the amount of LaNi5phase increases, while the amount of（LaMg）Ni3phase firstly increases and then *** alloys reversibly absorb and desorb hydrogen at 298 K smoothly. When Co content is 0.2 at%, the hydrogen absorption capacity reaches the maximum value of 1.14 H/M, and the absorption capacities reach 1.09 H/M and 1.03 H/M in the first minute at 298 K and 323 K, respectively. Electrochemical performance measurement results show that La0.75Mg0.25Ni3.5-xCoxalloys are completely activated within 2 cycles, and the cyclic stability of La0.75Mg0.25Ni3.3Co0.2alloy approaches 63.7% after 100 charge/discharge cycles, which is higher than that(S100= 60%) of La0.75Mg0.25Ni3.0Co0.5alloy. Thus, the La0.75Mg0.25Ni3.3Co0.2alloy exhibits optimum comprehensive properties of hydrogen storage and electrochemistry.

关键词： La-Mg-Ni hydrogen storage alloy Co substitution for Ni Electrochemical property

Thermodynamics and Magnetostriction of Fe-Co-B-Si-Nb-C Bulk Metallic Glasses

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Journal of Iron and steel Research International 2013年第2期20卷 58-61页

作者： GAO Zhen NI Xiao-jun GUO Jin-hua LI De-ren LU Zhi-chao ZHOU shao-xiong Advanced Technology and Materials Co Ltd China Iron and Steel Research Institute Group

Fe-Co-B-Si-Nb-C glassy alloy with the addition of C was prepared by arc melting and copper suck-casting. The thermodynamics and soft magnetic properties were investigated. The casted amorphous alloys were heat-treated at different temperatures. The differential scanning calorimeter （DSC） results and thermal expansion show complete thermodynamics of crystallization. Its magnetostriction properties were studied by capacitance method. Saturation magnetostriction increases to 38×10^-6. The amorphous alloy exhibits good soft magnetic properties with low coercivity and high saturation magnetic induction. The results show that minor addition of C is beneficial to enhance the saturation magnetostriction λs, and do not deteriorate the ability of forming amorphous.

关键词： amorphous material soft magnetic material magnetostriction thermal expansion

VCR and ASR technology for profile and flatness control in hot strip mills

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Journal of Central South University of Technology 2008年第2期15卷 264-270页

作者：曹建国魏钢城张杰陈先霖周一中 School of Mechanical Engineering University of Science and Technology Beijing Wuhan Iron and steel(group) Corporation

The roll contour pattern and variety of work and backup rolls in service and its effect on profile and flatness control performance in 1 700 mm hot strip mill at Wuhan Iron and steel(group) Corporation were tested and analyzed by the developed finite element models of different typical roll contours configurations.A rather smooth local work roll contour near strip edges and an increase in rolled length can be obtained by application of long stroke work roll shifting system with conventional work roll contours that is incapable of the crown *** comparison with the conventional backup and work roll contours configuration,the crown control range by the roll bending force enhances by 12.79% and the roll gap stiffness increases by 25.26% with the developed asymmetry self-compensating work rolls(ASR) and varying contact backup rolls(VCR).A better strip profile and flatness quality,an increase in coil numbers within the rolling campaign and a significant alleviated effect of severe work roll wear contours on performance of edge drop control are achieved by the application of ASR with crown control and wear control ability in downstream stand F5 and VCR in all stands of 1 700 mm hot strip mill.

关键词： hot rolling mill strip profile and flatness control wear finite element analysis

Mechanical Properties and Microstructure of X120 Grade High Strength Pipeline steel

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Journal of Iron and steel Research International 2010年第10期17卷 63-67页

作者： ZHANG Ji-ming SUN Wei-hua SUN Hao Technology Center Jinan Steel and Iron Group Corporation Jinan 250101 Shandong China

A new ultrahigh strength pipeline steel with high yield strength and high impact toughness was fabricated in this work, and mechanical properties and microstructure of the steel were investigated. The steel exhibited out- standing mechanical properties with yield strength levels of up to 951 MPa and tensile strength levels up to 1023 MPa. The sharp notch toughness with absorbed energy values of 227 J/cm2 at -30℃ and shear area of up to 95% in drop weight tear test （DWTT） at temperature of --20℃ were achieved. It was found that microstructure of the steel com- prises a majority of low-carbon lath bainite with different sublaths and sub-sublaths, meanwhile there is a high density of dislocation between laths and the dispersed film-like martensite-austenite （M-A） constituents. Most of the precipi- tates in this steel are duplex type containing Nb and Ti with characterized morphology of cap with the range of precipitation size from a few to tens nanometers.

关键词： pipeline steel mechanical property lath bainite precipitate

Effects of cooling rate on microstructure and microhardness of directionally solidified Galvalume alloy

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China Foundry 2024年第3期21卷 213-220页

作者： Ji-peng Li De-gao Qiao Jian Li Xiao-yang Luo Peng Peng Xian-tao Yan Xu-dong Zhang Gansu Jiu steel group Hongxing Iron and steel Co. Ltd.Jiayuguan 735111GansuChina School of Materials and Energy Lanzhou UniversityLanzhou 730000China

The influences of cooling rate on the phase constitution,microstructural length scale,and microhardness of directionally solidified Galvalume(Zn-55Al-1.6Si)alloy were investigated by directional solidification experiments at different withdrawal speeds(5,10,20,50,100,200,and 400μm·s^(-1)).The results show that the microstructure of directionally solidified Galvalume alloys is composed of primary Al dendrites,Si-rich phase and(Zn-Al-Si)ternary eutectics at the withdrawal speed ranging from 5 to 400μm·s^(-1).As the withdrawal speed increases,the segregation of Si element intensifies,resulting in an increase in the area fraction of the Si-rich *** addition,the primary Al dendrites show significant refinement with an increase in the withdrawal *** relationship between the primary dendrite arm spacing(λ_(1))and the thermal parameters of solidification is obtained:λ_(1)=127.3V^(-0.31).Moreover,as the withdrawal speed increases from 5 to 400μm·s^(-1),the microhardness of the alloy increases from 90 HV to 151 *** is a combined effect of grain refinement and second-phase strengthening.

关键词： Galvalume alloy directional solidification microstructure length scale microhardness