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7291.AISI1005钢在气体保护金属极电弧焊中计算模型的结构演化
[黑色金属冶炼和压延加工业] [2014-03-25]
A fully coupled (two-way), transient, thermal-mechanical finite-element procedure is developed to model conventional gas metal arc welding (GMAW) butt-joining process. Two-way thermal-mechanical coupling is achieved by making the mechanical material model of the workpiece and the weld temperaturedependent and by allowing the potential work of plastic deformation resulting from large thermal gradients to be dissipated in theform of heat.
关键词：钢铁；AISI1005；有限元模型；气体保护金属极弧焊；对接焊接；结构演化
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7292.不锈钢管冷轧工艺过程的有限元仿真分析
[黑色金属冶炼和压延加工业] [2014-03-25]
关键词：钢铁；不锈钢；冷轧；FEM
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7293.单肋式箱形截面钢弓弦拱桥面内和面外的不稳定耦合分析
[建筑业,黑色金属冶炼和压延加工业] [2014-03-25]
Steel single rib box section arch bridge is established on the basis of secondary development using parametric language of large-scale finite element software ANSYS.On the premise of same sectional area A of arch rib,height breadth ratio h/b is changed,and both the spatial instability mode under the condition of arch bridge's dead weight and the stability safety coefficient under the condition of the first step instability mode is calculated.With the aim to optimize distribution of stiffness and stability of single rib arch bridge,the target is to find out a height breadth ratio h/b which can make in-plane and out-plane instability mode coupling,that is to say,equivalent stiffness of in-plane and out-plane of the mode.
关键词：钢箱单肋拱桥；不稳定模式；安全系数；ANSYS；抗弯刚度
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7294.对850℃时效处理下2205双相不锈钢金属间相的定量分析
[黑色金属冶炼和压延加工业] [2014-03-25]
The precipitates in 850℃ aging 2205 Duplex stainless steel were extracted by the method of carbon extraction replicas.The method makes precipitates disperse uniformly and the contrast between precipitates and matrix distinct.TEM(Transmission Electron Microscope),EDS(Energy Dispersive Spectrometer) and SEM (Scanning Electron Microscope) were applied for the observation ofmicrostructure.The SEM micrographs were used for intermetallic size statistic,which revealed that the sizes of intermetallic increased with aging time.
关键词：钢铁；2205双相不锈钢；850℃时效处理；金属间化合物；碳萃取
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7295.钢铁坯料在高温下的抗氧化涂层
[黑色金属冶炼和压延加工业] [2014-03-25]
A new kind of anti-oxidation coating for steel billets at high temperature was prepared.The resistance property of the coatings for oxidation was investigated.The result indicated that the coatings could decrease the oxidation loss at 1300℃.The anti-oxidation mechanism of the coatings on the surface of steel billets at high temperature was proposed at the same time.
关键词：钢铁；高温抗氧化性能；钢铁坯料；涂层
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7296.应用于锅炉气热回收中高压蒸发器的SA210钢管的腐蚀失效分析
[通用设备制造业,黑色金属冶炼和压延加工业] [2014-03-25]
The corrosion failure analysis of an SA210 steel used in high pressure evaporator tube is conducted by XRD,SEM,OM.The result shows that the corrosion products in the inner wall of the steel tube is Fe3O4,mainly caused by the residual water in the evaporator tube corroding its inner wall with oxygen after the hydrostatic test of the boiler,finally leading to the corrosion leak of the tube.
关键词：钢铁；SA210钢管；高压蒸发器；气热回收锅炉；氧腐蚀
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7297.2013年钢铁相关行业运行情况及发展趋势
[专用设备制造业,金属制品业,汽车制造业,通用设备制造业,黑色金属冶炼和压延加工业] [2014-03-24]
2013年1-11月，全国规模以上工业增加值继续保持增长态势，增加值同比增长9.7%.比2012年同期回落0.3个百分点，比2011年同期回落4.3个百分点。预计2013年全年累计同比增长率难以超过10%。分行业来看，黑色金属冶炼及压延加工业呈现下滑趋势，金属制品业、通用设备制造业、专用设备制造业保持稳定增长，汽车制造业增长幅度扩大。
关键词：钢铁；机械工业；运营
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7298.CFRP-钢管混凝土构件屈曲分析
[黑色金属冶炼和压延加工业,非金属矿物制品业] [2014-03-24]
为了研究轴向荷载作用下CFRP (Carbon Fiber Reinforced Polymer)-钢管混凝土构件屈曲后的力学性能，利用有限元软件ABAQUS建立CFRP-钢管混凝土长、短柱有限元模型，并采用buckle 及riks 求解器对模型进行求解。通过将有限元模拟结果与现有试验以及解析公式计算结果相比较，验证有限元模型建立的合理性。之后调整有限元模型中CFRP 布置形式和CFRP厚度来考查其对整体构件抗屈曲性能的影响：CFRP厚度的变化对长、短构件临界荷载的影响甚微；对于短柱，随着环向CFRP层数的增加，钢管的局部屈曲得到了有效抑制，构件屈曲后极限承载力提高显著。而对于长柱构件，纵向布置CFRP可以有效提高构件屈曲后承载能力，随着纵向CFRP厚度的增加，屈曲后极限承载力呈线性增长。
关键词：钢铁；GFRP-钢管混凝土；屈曲；ABAQUS；有限元分析；承载力
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7299.氢发射环境中高强度钢材的寿命预测模型开发
[黑色金属冶炼和压延加工业] [2014-03-24]
Hydrogen embrittlement of high strength steel is the most predominant unforeseen hurdle since high strength materials show sensitivity to the phenomena and the source of the hydrogen can be anything within the fabrication process, maintenance practice, or the natural corrosion cycle. Historically, the various aerospace defense contractors have each tested in their own manner, which has led to the national standard incorporating many approved test geometries and grey procedures. This work evaluated hydrogen susceptibility over a range of material strength, load level, and hydrogen emitting environment (weight- percent sodium chloride NaCl) which demonstrated performance with parameter ranges, not as pass/fail results, while developing life predictive models for each geometry.
关键词：钢铁；刚强度合金；氢脆；航天系统；寿命预测模型
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7300.烫印过程中DP钢发动机罩的结构分析和质量预测
[汽车制造业,黑色金属冶炼和压延加工业] [2014-03-24]
In the paper,it took the hot stamping process of DP steel engine hood for example and took DP800 as object of research.The forming limit,variation of major strain,minor strain and thickness,as well as the potential equality defects were analyzed by using eta/DYNAFORM software.The research results show that duplex steel plate can meet the performance requirements of car engine dumping plank forming,which offers theory basis for the production of similar parts.
关键词：钢铁；应变分析；发动机罩；烫印
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