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7311.铁路桥梁护栏腐蚀的检测和量化的可行性研究
[铁路、船舶、航空航天和其他运输设备制造业,黑色金属冶炼和压延加工业,建筑业] [2014-03-21]
The Center for Nondestructive Evaluation at Iowa State University has experience in development of measurement techniques and new sensors using a variety of interrogating energies. This research evaluated feasibility of three technologies—x-ray radiation, groundpenetrating radar (GPR), and magnetic flux leakage (MFL)—for detection and quantification of corrosion of embedded reinforcing steel.The methods provide useful and complementary information. GPR provides a rapid approach to identify reinforcing steel that has anomalous responses. MFL provides similar detection responses but could be optimized to provide more quantitative correlation to actual condition. Full implementation could use either GPR or MFL methods to identify areas of concern, followed by radiography to give a visual image of the actual condition, providing the final guidance for maintenance actions.
关键词：钢铁；桥面板；缓蚀剂；钢筋混凝土；无损测验；路面罩面；桥梁护栏
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7312.基于机械性能测试的铁路焊接接头的材料和结构设计
[黑色金属冶炼和压延加工业] [2014-03-21]
Industrial design is important for industry,especially in the circumstance concerning the human security,of which the material selection and design basing on serious experiments,especially mechanical-tests have drawn more and more attentions of many artists and scientists.In this study,by tension,impact,hardness and scanning electron microscopy (SEM),the mechanical property of the flash butt welding joint of U71Mn rail steel to bainitic alloy steel used for railway frog is studied.
关键词：钢铁；工业设计；材料；贝式钢体；闪光对接焊
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7313.一种重型桥梁建造钢板的检测缺陷研究
[黑色金属冶炼和压延加工业] [2014-03-21]
The flaws in a heavy bridge-making steel plate (Q370qE) were detected by ultrasonic test,the types and formation reasons of which were studied by metallographic examination,scanning electron microscope (SEM) and energy dispersive X-ray (EDX) spectrometer.The results showed that the types of the flaws were mainly crack,micropore and inclusion.The formation of crack and micropore was attributed to the center segregation,porosity,as well as the role of structural stress and thermal stress.Moreover,the inclusions were mainly composite oxides (MgO,Al2O3,CaO,etc.) and MnS,the former came from the raw materials and impurity oxides,however,the latter came from the center segregation of the alloying elements.Besides,some improvement measures to reduce detecting flaws were also proposed.
关键词：钢铁；检测缺陷；Q370qE；桥梁建造钢板；微孔
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7314.提升二级轻气发射器效能的薄不锈钢破裂盘的设计和特性研究
[黑色金属冶炼和压延加工业] [2014-03-21]
This project consisted of determining how to manufacture burst disks out of stainless steel shim stock, devising a fixture to reliably laser etch the surface of the SSBDs, determining parameters for the laser etching, test the SSBDs for reliability and calibrating them for burst pressure, implementing the SSBDs into the 17-cal launcher, modifying existing launcher components, and finally evaluating SSBD’s effect on launcher performance.
关键词：钢铁；爆破试验；不锈钢；二级轻气；试验设计
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7315.单一驱动形状记忆合金的耦合
[黑色金属冶炼和压延加工业] [2014-03-21]
The objective of the single-motion-actuated- shape-memory-alloy coupling (SMA2C) is to produce a small, single motion actuator used to secure andthen release the solar panels on a CubeSat, or other very small satellite, upon command.
关键词：钢铁；形状记忆合金；二元合金；驱动器
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7316.钢管混凝土结构的经济分析
[黑色金属冶炼和压延加工业,非金属矿物制品业,建筑业] [2014-03-21]
The concrete-filled steel tube structure possesses the advantages stemming from both steel and concrete. When the structure receives pressure, the concrete in the steel tube bears the stresses from three directions owing to the restriction of the steel tube.The combination of both materials can help conquer their respective weakness and bring their strong points into full play.play.Therefore the concrete-filled steel tube structure has a bright future. Whether a structure system has a bright future largely depends on the economic benefit of the system. This paper presents an economic analysis on concrete-filled steel tube structure by way of comparing the reinforced concrete structure.
关键词：钢铁；钢管混凝土结构；钢筋混凝土结构；经济效益
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7317.纳米复合材料不锈钢粉末的技术研究
[黑色金属冶炼和压延加工业] [2014-03-21]
The objective of this Cooperative Research and Development Agreement (CRADA) between UT-Battelle (hereinafter the “Contractor”) and MesoCoat Inc., (hereinafter the “Participant”) is to utilize and evaluate NanoComposite Stainless Steel Powder as a coating technology for increased wear and corrosion resistance of component material.
关键词：钢铁；纳米复合材料；不锈钢；粉末技术
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7318.钻头和卡盘隔离器的革新以减少锚杆钻机的噪音
[黑色金属冶炼和压延加工业] [2014-03-20]
Among underground coal miners, hearing loss remains one of the most common occupational illnesses.This paper documents the evolution of the bit isolator and chuck isolator. Laboratory testing confirms that production bit and chuck isolators reduce the A-weighted sound level generated during drilling.
关键词：钢铁；煤矿；钻头；锚杆钻进；职业安全与健康；噪音阻尼
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7319.无铅奥氏体不锈钢的发展
[黑色金属冶炼和压延加工业] [2014-03-20]
Pb-free austenitic stainless steels were investigated by adding sulfur, rare earth (Re) elements and bismuth. The metallurgical properties, machinability and mechanical properties of both steels were examined. The results show that a significant amount of grey, spindle shaped inclusions were discovered in austenitic stainless steels, and they should belong to MnS inclusions containing bismuth element and rare earths oxide.
关键词：钢铁；机械加工性；无铅奥氏体不锈钢；稀土
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7320.铝桥面板的发展和配置
[黑色金属冶炼和压延加工业,金属制品业,建筑业] [2014-03-20]
This report contains the analysis and retrofit of a steel truss bridge on KY 974 over Howard Creek in Clark County, Kentucky. The bridge had major corrosion and damage to the steel stringers, along with cracking and leaching occurring in the concrete bridge deck.
关键词：钢铁；铝桥面板；裂化；腐蚀；配置
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