Induced effects of Cu underlayer on（111） orientation of Fe50 Mn50 thin films

Effects of Cu underlayer on the structure of Fe50 Mn50 films were studied. Samples with a structure of Fe50 Mn50 (200 nm)/Cu(tcu) were prepared by rnagnetron sputtering on thermally oxidized silicon substrates at room temperature. The thickness of Cu underlayer varied from 0 to 60 nm in the intervals of 10 nm. High-vacuum annealing treatments, at different temperatures of 200, 300 and 400℃ for 1 h, respectively, on the Fe50Mn50 (200 nm)/Cu(20 nm) thin films were performed. The surface morphologies and textures of the samples were measured by field emission scan electronic microscope (FE-SEM) and X-ray diffraction(XRD). Energy dispersive X-ray spectroscopy (EDX) and Auger electron spectroscopy(AES) were used to analyze the compositional distribution. It is found that Cu underlayer has an obvious induce effect on (111) orientation of Fe50 Mn50 thin films. The induce effects of Cu on (111) orientation of Fe50 Mn50 changed with the increase of Cu layer thickness and the best effect was obtained at the Cu layer thickness of 20 nm. High-vacuum annealing treatments cause the migration of Mn atoms towards surface of the film and interface between Cu layer and substrate. With the increasing annealing temperature, migration of Mn atoms is more obvious, which leads to a Fe-riched Fe-Mn alloy film.     

网状阳极在大型储罐底板阴极保护工程中的应用

文章介绍了网状阳极在茂名、湛江、岚山和上海地区的大型储罐阴极保护系统的应用情况。从实际运行的结果看,罐底板的保护电位都达到了设计要求和标准规定,保护电位分布相当均匀。保护电流密度也满足了设计要求。保护效果较好,表明网状阳极对于大型储罐的外底板的阴极保护是一种较好的解决方案。对于发现的几个问题也作了讨论。     

Ti Coating on Magnesium Alloy by Arc-Added Glow Discharge Plasma Penetrating Technique

MAGNESIUM is the8th most abundant element on theearth.Because of that it has some advantageousproperties such as high ratio of strength/weight with adensity that is only2/3that of aluminum and1/4that ofiron,high ratio of rigidity/mass,special characteristicsof electromagnetic shield and shock absorption,excellent cutting and polishing performances,magnesium alloys have been used widely by widely inmany manufacturing industries including aerospace,automobile,electronics and so on.But there i…     

选矿厂细磨磨矿介质的选择及研究

介绍、分析研究了选矿厂细磨中的磨矿介质选择的方法。从磨矿介质的尺寸、形状、材质 3个方面 ,进行了理论研究和实验验证 ,提出了一个可行的方案。     

高镍球铁的球化、孕育工艺的热分析

采用热分析的方法分析高镍球铁的球化、孕育效果及球化衰退过程中温度-时间曲线特征点的变化;对高镍球铁的球化衰退时间进行具体的试验分析.结合金相组织照片对石墨形态变化过程进行观察和验证.结果表明:MgNi球化剂球化效果良好,在4～6 min内浇注不会产生球化衰退.     

基于MSPC方法的GMAW在线监测

熔化极气体保护焊(GMAW)广泛地应用于自动焊中，其焊接过程在干扰存在的情况下易产生焊接质量问题，因此，自动焊中焊接质量的在线监测已成为制造业中亟待解决的问题之一。为实现焊接产品质量的“零缺陷”及生产过程质量监测的目标，采用电弧传感获取的电信号，从单变量统计过程控制的应用结果出发，提出了把多变量统计过程控制(MSPC)应用于GMAW过程的在线质量监测。并在自我开发的一套在线监测系统上，通过试验验证了MSPC方法的可行性。     

蠕虫状石墨铸铁的炉前控制及凝固规律探讨

对蠕铁的炉前控制技术及凝固的基本规律进行了探讨，总结了稳定蠕铁生产的质量控制方法。主要结论是：（1）变质剂加入量应根据原铁液w（S）的高低进行调整；（2）蠕铁Y形试样与炉前试样之间的蠕化率相差30％～55％，炉前金相蠕化率控制在20％～45％之间可获得合格的蠕铁铸件；（3）蠕铁件的蠕化率不宜控制过高．普通砂型件宜低于95％，树脂砂铸件低于85％为宜；（4）蠕铁液停留时间在30min之内，其力学性能和金相组织变化不大，超过该时间蠕铁组织不易控制。     

压力容器无损检测--超声检测技术(Ⅱ)

简述在用压力容器超声检测的特点,列举了换热器、焦炭塔、球罐、管道及加氢反应器等典型容器的超声检测要点,最后介绍了超声衍射时差法。     

神经网络与有限元结合在轧机板形预报中的应用研究

通过有限元仿真分析,较准确的模拟了带钢轧制过程,获取对轧机板形影响较大的参数值,并将其结果作为训练样本对神经网络进行训练,建立了较为理想的基于神经网络的板形预测模型,实现了轧制过程中的板形参数的预报。仿真结果表明该神经网络与有限元结合的板形预测模型可获得良好的预测精度,弥补了传统板形预测模型的预测精度不能满足板形在线控制要求的缺陷。     

Influencing factors on elastic-plastic deformation of multi-layered surfaces under sliding contact

Stress distribution in the gradient multi-layered surface under a sliding contact was investigated using finite element method(FEM). The main structure parameters of layered surface discussed are total layer thickness,layer number and elastic modulus ratio of layer to the substrate. A model of multi-layered surface contact with rough slider was studied. The effect of the surface structure parameters on the elastic-plastic deformation was analyzed.