转炉出钢口长寿化与挡渣出钢

在攀钢120t转炉应用整体出钢口及挡渣出钢技术,达到了提高出钢口使用次数,稳定出钢时间和出钢温降,减少下渣量和提高合金收得率的效果,为减轻劳动强度、稳定工艺操作、改善钢质量起到了积极作用。     

Analysis of precipitation in a Cu-Cr-Zr alloy

Precipites in Cu-0.42%Cr-0.21%Zr alloy were analyzed by using scanning electron microscope （SEM）, energy dispersive X-ray spectroscopy （EDXS） and transmission electron microscope （TEM）. After the solid solution was performed at 980℃ for 2 h, water-quenched and aged at 450℃ for 20 h, the precipite had a bimodal distribution of precipitate size. The coarse precipitates are pure Cr and Cu5Zr, the dispersed fine precipitate is CrCu2（Zr, Mg） and pure Cr ranging from 1 to 50 nm. The coarse phases formed during solidification and were left undissolved during solid solution. The fine precipitates are the hardening precipitates that form due to decomposition of the supersaturated solid solution during aging.     

攀钢冷轧钢板在家电产品中的应用

简要介绍了攀钢冷轧钢板生产的技术、装备情况、分析了攀钢冷轧钢板在家电产品 的应用现状及发展前景。     

低碳铝镇静钢铝锰铁脱氧合金化试验

介绍了攀钢用铝锰铁脱氧合金化生产高级别冷轧薄板用钢的可行性和脱氧合金化生产低碳铝镇静钢的工艺路线。采用铝锰铁脱氧合金化后,低碳铝镇静钢优率从现工艺的８５％提高到９９％以上,并且冷轧薄板的表面质量有了大幅度的提高。     

镁包芯丝铁水脱硫研究

在实验室采用镁包芯丝对铁水进行了预处理脱硫,实验结果表明：合适的脱硫剂配方,足够的熔深度,熔池的扩散条件、铁水中低氧含量是提高镁脱硫利用率,充分发挥镁脱硫能力的关键。     

Color-tunable Gd-Zn-Cu-ln-S/ZnS quantum dots for dual modality magnetic resonance and fluorescence imaging

Inorganic nanoparticles have been introduced into biological systems as useful probes for in vitro diagnosis and in vivo imaging, due to their relatively small size and exceptional physical and chemical properties. A new kind of color- tunable Gd-Zn-Cu-In-S/ZnS （GZCIS/ZnS） quantum dots （QDs） with stable crystal structure has been successfully synthesized and utilized for magnetic resonance （MR） and fluorescence dual modality imaging. This strategy allows successful fabrication of GZCIS/ZnS QDs by incorporating Gd into ZCIS/ZnS QDs to achieve great MR enhancement without compromising the fluorescence properties of the initial ZCIS/ZnS QDs. The as-prepared GZCIS/ZnS QDs show high T1 MR contrast as well as ＂color-tunable＂ photoluminescence （PL） in the range of 550-725 nm by adjusting the Zn/Cu feeding ratio with high PL quantum yield （QY）. The GZCIS/ZnS QDs were transferred into water via a bovine serum albumin （BSA） coating strategy. The resulting Cd-free GZCIS/ZnS QDs reveal negligible cytotoxicity on both HeLa and A549 cells. Both fluorescence and MR imaging studies were successfully performed in vitro and in vivo. The results demonstrated that GZCIS/ZnS QDs could be a dual-modal contrast agent to simultaneously produce strong MR contrast enhancement as well as fluorescence emission for in vivo imaging.     

An Automated Ultrasonic NDT System for In-Situ Inspection of Wind Turbine Blades

It is crucial to maintain wind turbine blades regularly, due to the high stress leading to defects or damage. Conventional methods require shipping the blades to a workshop for off-site inspection, which is extremely time-consuming and very costly. This work investigates the use of pulse-echo ultrasound to detect internal damages in wind turbine blades without the necessity to ship the blades off-site. A prototype 2D ultrasonic NDT （non-destructive testing） system has been developed and optimised for in-situ wind turbine blade inspection. The system is designed to be light weight so it can be easily carried by an inspector onto the wind turbine blade for in-situ inspection. It can be operated in 1D A-scan, 2D C-scan or 3D volume scan. A software system has been developed to control the automated scanning and show the damage areas in a 2D/3D map with different colours so that the inspector can easily identify the defective areas. Experiments on GFRP （glass fibre reinforced plastics） and wind turbine blades （made of GFRP） samples showed that internal defects can be detected. The main advantages of this system are fully automated 2D spatial scanning and the ability to alert the user to the damage of the inspected sample. It is intended to be used for in-situ inspection to save maintenance time and hence considered to be economically beneficial for the wind energy industry.     

Bending Stresses of Steel Web Tapered Tee Section Cantilevers

Although commonly used, no design method is available for steel web tapered tee section cantilevers. This paper investigates the bending stresses of such beams. Relationships between the maximum compressive stress and the degree of taper were investigated. An analytical model is presented to determine the location of the maximum stress when subjected to a uniformly distributed load or a point load at the free end and was validated using finite element analysis and physical tests. It was found that the maximum stress always occurs at the support when subjected to a uniformly distributed load. When subjected to a point load at the free end and the degree of taper is up to seven, it was found that Miller＇s equation could be used to determine the location of the maximum stress. However, it is shown that when the degree of taper is greater than seven, Miller＇s equation does not accurately predict the location and the analytical model should be used. It was also found that the location of the maximum stress was solely dependent on the degree of taper, while a geometric ratio, fl was required to determine the magnitude of the maximum stress. A simple method that predicts the magnitude of the maximum stress is proposed. The average error in the prediction of the magnitude of the maximum stress is found to be less than 1.0%.     

Poled Polyaniline Coated Piezo Composite Using Low Electric Field and Reduced Poling Time： A Functional Material

Composite films were prepared by two different routes： lead zirconate titanate （PZT） particles coated with polyaniline （PAni） dispersed in a polymeric matrix of polyvinylidene fluoride （PVDF）; and PZT particles and PAni powder dispersed separately in the polymer matrix. The electrical conductivity of the particles was controlled by the protonation and de-protonation of PAni in solution with controlled pH. The results indicate that the percolation threshold of the composite made of PZT coated with a conductive layer （PZT-PAni） is in the range of 20 vol.% to 30 vol.% of PZT-PAni. The PZT-PAni/PVDF composite redoped in solution with pH 3.7 showed the best results in terms of longitudinal piezoelectric coefficient （d33） in samples containing 30 vol.% of ceramic particles due to the equilibrium between conduction and poling effects on the composite. The poling process of the composite sample required just 5 MV/m electric field applied during 15 min. Furthermore, the composite was used as sensor in structural health monitoring （SHM）, showing the possibility to propose it as a functional material.