过热度对帘线钢连铸方坯碳偏析的影响

针对帘线钢生产过程中出现的质量波动问题,采用钻屑成分分析和低倍组织分析方法,研究了不同过热度对帘线钢连铸方坯横纵向碳偏析的影响。研究结果得出：（1）偏高过热度（34 ℃）比偏低过热度（29 ℃）,其对应的中心碳偏析程度更低,中心线位置碳元素质量分数的波动程度更小;（2）V形偏析带是造成铸坯中心线位置偏析指数纵向发生波动的直接原因,这也表明仅通过横断面来判定铸坯偏析情况的好坏存在局限性;（3）过热度越低,等轴晶比例越高,但同时由于能够抽吸到中心位置附近的高溶质液相量更大,中心位置的偏析程度及波动程度可能更大。因此,对于本厂所生产的帘线钢而言,采用偏高的过热度铸坯碳元素分布更为均匀,质量更为稳定。     

Epitaxial growth and surface morphology of aluminum films deposited on mica studied by transmission electron microscopy and atomic force microscopy

The bulk structure and epitaxial growth of aluminum films deposited on mica substrates by thermal evaporation in a wide temperature range (16-550 °C) in high vacuum were investigated by transmission electron microscopy and transmission electron diffraction. The surface morphology of the films was observed and analyzed by atomic force microscopy. The films prepared at room temperature consist of single crystals having a diameter of 90 ± 40 nm with (111) planes. The surface of the films comprises spherical grains with morphology that is caused by self-shadowing during the deposition. The surface of the films becomes smoother as the temperature increases, and atomically-smooth surfaces with a root-mean-square roughness of about 0.45 nm over an area of 1 μm² are obtained at 250-350 °C. The crystals are oriented randomly along the [111] direction perpendicular to the substrate. The surface of the films consists of larger (> 300 nm) grains with terraces, and the surface becomes rough above 400 °C. Films with well-oriented single crystals along the [111] direction perpendicular to the substrate are obtained above 520 °C. The films grown epitaxially at 520-550 °C are characterized by the isolated grains with a diameter of 1220 ± 450 nm.     

基于门户技术的EAI实现方法研究

为了给企业应用集成EAI(enterprise application integration)的工程实践提供一种基于开放标准的简单易行的解决方案作为理论指导,首先对当前应用集成的主要技术以及实现层次进行了调查,并报告了现状.然后对JSR168(Java specification requests 168)规范提出的信息门户的实现模型以及相关技术标准进行了研究分析.在分析和研究该模型的基础上,对其进行了扩展,使其为企业应用集成的实现提供支持.接着着重论述了基于扩展模型的EAI实现方法,及主要技术问题的解决方法.从而为企业应用集成提供了一个全新的解决方案及技术指导.     

82B盘条拉拔断裂原因分析

利用光学显微镜（OM）、显微硬度计（MS）、扫描电镜（SEM）等手段对82B拉拔断裂试样进行了分析。结果表明,82B盘条母材表面有擦伤现象,导致盘条在进入拉拔道次前即发生断裂,对此类断裂机理进行了探讨。拉拔断裂试样的表层出现马氏体（M）＋屈氏体（T）或表层硬化组织,进而在此类组织中出现V形裂纹或平行横裂纹,继续拉拔导致断裂。最后针对降低82B盘条拉拔断丝率提出了改进措施。     

基于CAN总线的直升机旋翼共锥度测试系统

分析了直升机旋翼共锥度测量的原理,并根据CAN现场总线技术的特点,设计了信息数据采集与传输系统,使得上位机与下位机各个节点之间可以进行信息交换,进行了上位机和下位机的硬件电路设计和软件程序设计,使各个测量结果都能在控制台上显示,在实际应用中此系统得到了很好的测量效果.     

基于S3C44B0X的转速测量模块设计

利用可编程定时计数器82C54在S3C44B0X系统中实现测量棉纺机械电机转速的方法,并给出了转速测量模块的硬件电路和82C54的初始化程序。     

用AD2S82A实现雷达方位角的数字变换

AD2S82A是ADI公司专门针对旋转变压器信号格式而设计生产的单片旋转角／数字变换芯片。文章介绍单片旋转角／数字变换器（R／D）AD2S82A的功能及其特性,讨论实际应用中AD2S82A外围器件的选择,给出实现雷达方位角数字变换硬件电路设计及软件设计方法。     

Investigation of biomass formation during the biodegradation of ester base lubricants

Comparative studies were performed to assess the biodegradation of the synthetic lubricant base stock, Priolube 3999, by P. putida using the CEC test method and manometric respirometry. Supplementary analyses demonstrated the production of a non-readily biodegradable metabolite, trimethylol-propane, the alcohol group of the candidate fluid. Evidence was obtained that indicated that a significant fraction of carbon added as test substance remained incorporated in the biomass. The implications of these results are discussed and modifications to the CEC test proposed.     

石焦JN60-82型焦炉蓄热室封墙严密状况分析及改进

文章分析了JN60-82型焦炉蓄热室封墙及斜道区正面严密状况,指出了其存在串漏现象的表现和原因,并给出了解决的办法和步骤,阐述了改进的方向。     

82B高碳钢小方坯中磷的偏析行为

研究了拉速(2.8～3.0 m/min)、二冷比水量(0.83～1.8 L/kg)和末端电磁搅拌(0～400 A,6 Hz)对82B钢(/%:0.79～0.81 C、0.21～0.24Si、0.81～0.83Mn、0.012～0.016P、0.005～0.008S、0.25～0.30Cr)130 mm×130mm铸坯断面P偏析的影响结果表明,磷在铸坯中的最大偏析点不在凝固中心,而是在柱状晶与等轴晶交界处;随着二冷比水量的增大、拉速的降低及末端电磁搅拌强度的增大,P元素的最大偏析率有明显降低。