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7261.基于人工神经网络之反向传播算法的50A1300钢铁热变形流变应力的预测
[黑色金属冶炼和压延加工业] [2014-03-27]
The researches of non-oriented silicon steel are mainly focused on the effect of main processing parameters on the microstructure and magnetic properties,but there have been few studied about its flow stress until now.In this paper,the hot deformation of non-oriented silicon steel 50A1300 is studied by thermal-mechanical simulation method.The hot deformation behavior of the steel is explored and the flow stress prediction of the steel is established based on a kind of BPA ANN.A piecewise method is proposed in this paper,and the prediction with this new method has good accuracy.
关键词：钢铁；热变形；流变应力；无取向硅钢；人工神经网络；反向传播算法
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7262.钢筋表面缺陷自动检测装置的设计
[黑色金属冶炼和压延加工业] [2014-03-27]
To inspect the surface quality of steel bar,we designed an automatic system including linear camera and laser.Through the comparison among kinds of cameras,we select linear CCD to our system.The laser is also chosen by us with its high luminance and performance.Through a series of computation,we select the appropriate camera lens to our device.At last,we draw the whole detection system.This device has been used well and provides a good foundation for prospective image processing.
关键词：钢铁；表面缺陷；检测体系；线性光源；线性摄像机
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7263.3月份国际钢市盘整运行
[黑色金属冶炼和压延加工业] [2014-03-27]
2月份国际钢市小幅下滑。其中，欧美市场下跌幅度较大。亚洲经济走势短期内存在很大的不确定性，虽然3月份亚洲市场需求会出现季节性复苏，但是仍比较有限。整体上判断，3月份国际钢市将盘整运行。
关键词：钢市；产量；需求
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7264.基于有限元模拟技术的球壳类钢铁的应力研究
[黑色金属冶炼和压延加工业] [2014-03-27]
In order to verify correctness of two-dimensional axisymmetric finite element model,this paper carries out axial symmetry analysis of the steel ball shell by ANSYS software and 2-D finite element model is established.The radial and tangential stress distribution is acquired,through comparison with the theoretical solution,both are in good agreement.So it is feasible to simulate the three-dimensional model by finite element axisymmetrical two-dimensional model.
关键词：钢铁；轴对称；ANSYS软件；径向应力；切应力
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7265.钢铁煤炭行业遇转型苦恼：行业冬天在后面
[黑色金属冶炼和压延加工业,电力、热力、燃气及水生产和供应业] [2014-03-27]
关键词：钢铁业；煤炭业；转型
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7266.火车车轮钢铁的疲劳试验和疲劳可靠性研究
[黑色金属冶炼和压延加工业] [2014-03-27]
To obtain fatigue design data of the train wheel steel,the fatigue tests were carried out for the steel of K type and B type train wheel separately,which fatigue limit was measured using the fluctuation method,the fatigue life of two kinds of wheel steels were tested using the grouping method at the three stress levels,two different materials and different structures have an influence on the fatigue properties of the wheels using reliability principle.The fatigue life distribution of the B type is scattered relatively.S-N curve equation and P-S-N curve equation of the two kinds of steel were calculated.The theoretical basis were put up for developing design standards and safety evaluation of the both wheel.
关键词：钢铁；疲劳可靠性；疲劳测验；火车车轮；概率
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7267.钢板-泡沫铝-钢板三明治结构的界面结合机制研究
[黑色金属冶炼和压延加工业] [2014-03-27]
Steel sheet/aluminum foam/steel sheet sandwich structure have higher stiffness than aluminum sheet/aluminum foam/aluminum sheet sandwich.So in this study the aim is to manufacture steel/Al-foam core/steel sandwich panels by rolling of two steel-face sheet and Al-Si powders.The deformation of the rolled-piece,powder grains and the joining deformation of the composite interface are discussed and analyzed in this paper.SEM and EDS of the compound interface are investigated.It was concluded that a metallurgy bonding interface was formed by diffusion reaction and a brittle compound generated.
关键词：钢铁；泡沫铝三明治；轧制变形；界面结合
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7268.冷却速率对bearing-B钢铁的金相组织和硬度的影响
[黑色金属冶炼和压延加工业] [2014-03-26]
Effects of cooling rate on metallographic and hardness ofbearing-B steel were investigated in presem research. The results showed it consists of ferrite and pearlite formed in the initial stage of the transformation in the studied bearing-B steels cooled at 0.5 ℃/s.
关键词：钢铁；冷却速率；金相组织；硬度；bearing-B钢铁
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7269.脉冲电流对钢坯显微组织演化影响的实验研究
[黑色金属冶炼和压延加工业] [2014-03-26]
This paper studies the influence to the microstructural evolution of low carbon steel and low carbon Nb steel through experiments in order to improve the microstructure of billet.The results of the study show that electropulsing has significant impact on the phase transformation from austenite to ferrite of low carbon steel and low carbon Nb steel,which improves nucleation rate of ferrite inside austenite grain.
关键词：钢铁；钢坯；显微组织；脉冲电流；铁素体；成核现象
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7270.欧洲标准负载实施情况下基于遗传算法的钢结构的优化问题
[黑色金属冶炼和压延加工业] [2014-03-26]
This paper presents an implementation of Eurocode load cases for discrete global optimi-zation algorithm for planar structures based on the principles of finite element methods and genetic algorithms.The final optimal design is obtained using IPE sections chosen as feasible by the algorithm,from the available steel sections from industry.The algorithm is tested on an asymmetric planar steel frame with promising results.
关键词：钢铁；优化；遗传算法；欧洲标准
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