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7301.难熔金属的扩散对合金——奥氏体、铁素体和马氏体不锈钢
[黑色金属冶炼和压延加工业] [2014-03-21]
This thesis utilized the diffusion couple approach to evaluate the addition of molybdenum, niobium, tantalum, and tungsten to 316 stainless (316SS) and alloy HT9 steels. Refractory elements have been previously studied as alloying candidates to mitigate problems such as radiation-induced segregation, void swelling, and irradiation creep in reactor steels. Diffusion couples were characterized via energy dispersive x-ray spectroscopy (EDS) and nanoindentation to examine refractory element solubility, diffusivity, and the effects these elements have on hardness and elastic modulus in 316SS and alloy HT9.
关键词：钢铁；铁氧体；难熔金属；扩散；奥氏体；铁素体；马氏体
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7302.利用摩擦阻尼器的钢框架的地震防护研究
[黑色金属冶炼和压延加工业] [2014-03-21]
This study investigates a friction damping bracing system in order to improve the response of steel frames when subjected to severe seismic excitations,beyond the design earthquake.A simplified model describing the behavior of the friction damper device was developed for global analyses of steel frames.
关键词：钢铁；钢框架；摩擦阻尼器；地震响应；能量耗散
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7303.新型汞合金在太空零件制造中的应用
[金属制品业,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] [2014-03-21]
Sound amalgams can be fabricated by substituting Ga-In liquid for mercury; Cu-coated steel fibers bond well with the amalgam components. Inclusion of steel fibers significantly improved mechanical properties. An application scenario utilizing amalgams for in-space parts fabrication and repair was suggested. Procedure and materials need to be optimized.
关键词：钢铁；汞中毒；汞；金属纤维；机械性能
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7304.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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7305.一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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7306.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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7307.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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7308.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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7309.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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7310.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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