焦化废水处理全面达标的试验与探讨

针对宝钢焦化废水经A－O工艺处理后，COD、F、T－CN、色度超标问题进行工艺改进和化学处理法试验，结果用A－O－O法处理焦化废水，再加上化学处理使宝钢焦化废水全面达标。     

一种普通冲床的数控改造

本文针对J94A－4型普通冲床的工作特点,提出了应用单片机技术进行数控改造的设计方案,介绍了数控系统的硬件构成和软件设计。     

斜端面特种起重轨的窄间隙电弧焊

介绍了采用窄间隙电弧焊方法焊接斜端面、特种轨型起重轨的方法。焊接分两个阶段进行：第1阶段焊接轨底部分，采用φ4mm焊条，焊接电流140－160A，每道焊完进行清渣；第2阶段焊接轨腰和轨头部分，采用φ5mm焊条，焊接电流180－200A。轨腰和轨头部分焊接连续进行，每层焊道之间不进行除渣。焊接接头经过实际应用，情况良好。     

结构用Ti—6Al—2Sn—2Zr—2Cr—2Mo—Si钛合金的热机械加工和热处理

Ti－6A1－2Sn－2Zr－2Cr－2Mo－Si（Ti－6－22－22S）是由喷气发动机公司（RMI）研制的一种α-β合金，旨在使截面尺寸为100mm的工件获得高强度、良好的断裂韧性／强度、高于Ti-6A1－4V的弹性模量和相对较好的中温蠕变性能．为了达到上述目标，合金设计是在Ti－6A1的基础上，添加β同晶型元素钼和β共析元素铬和硅，以及中性元素锡和锆．通过适当平衡这些合金元素使。一厂合金达到所要求的性能．原始合金中硅的名义成分为0．23Wt％，进行。－p加工和。一产热处理后，可使拉伸性能最佳化．该合金现在可以以量标准的加工产品形式进行…     

翼片水浸超声探伤

探索了水浸超声波在检测特殊形状5A06－O（LF6－M）3．0mm炮弹翼片质量中的应用。通过数据分析得出了探测波形的种类及检测方法,制定了验收的标准．经实际应用,确保了翼片的质量和安全使用,减少了经济损失,保证了供货期,同时也验证了检测方法的可行性,为特殊形状薄板内部质量的控制提供了较科学的依据。     

台式多功能声显微镜的研制

研制成功了一台THSAM－M型台式多功能声显微镜,在PC机内插入采样速率为10^9次／s的超高速A／D卡以及快脉冲产生和接收卡,利用软件完成信号检测和显示功能,仪器工作频率为1－100MHz;在检测样品时,可同时显示A,B,C扫描结果,并可观察样品的多样层B,C扫描图象,还可显示样品的内部三维结构,该系统已成功应用于多个领域的样品测量,获得了一定效果。该机体积小,功能强、成成本 较低,具有广阔的应用前景。     

含Pb、As、Sn D型石墨铸铁抗氧化性能的研究

利用含Pb、As、Sn地方生铁制取D型石墨铸铁并测定了这种铸铁的抗氧化性能。结果表明：这种含Pb、As、Sn D型石墨铸铁的抗氧化性能明显优于A型石墨铸铁。在600℃时，其抗氧化性能比A型石墨铸铁提高了56％－64％；在900℃时，其抗氧化性能也比A型石墨铸铁提高了约5％－27％。     

提高2A12—O铝合金型材伸长率的工艺研究

对不同时期生产的2A12－O铝合金进行对比，找出了影响近期的生产的2A12－O铝合金型材伸长率的因素，进行了调整工艺试验，确定了提高型材伸长率的途径。     

机具、配件及材料

襄樊斯普瑞电力电子有限公司 主要产品：UDS三相整流桥系列（200－600A，适用于CO2气保焊机）；UDQ单相整流桥系列（40－600A，适用于焊机和充电器）；     

交流接触器在特殊场合下的正确使用

交流接触器主要用于远距离接通加分断交流动力电路。由于它具有结构紧凑、操作简单、维修容易等优点，也广泛应用于其他电路中。在使用中，有时产生一些特殊故障，多因运用不当而引起。下面，举几个实例进行剖析。一、100A交流接触器不能控制50A直流电流某厂有一台整流设备，电气原理图如图1（为方便，只给出控制回路，可控硅触发回路）。这台设备工作时．直流输出电压200V，直流电流50A，通过民、K。、K连接的可控硅触发电路，可对输出的直流电压和电流进行调节（0－250V，0－80A），直流回路输出接触器KM为CJ12－100型交流接触器。该…     

Influence of Heat Treatment on Damping Behaviour of the Magnesium Wrought Alloy AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Thermodynamics Study on the Decomposition of Chromite with KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

RESEARCH ON THE FORMATION MECHANISM OF INTERNAL CRACK IN THE CONTINUOUS CASTING SLAB

In view of the periodic bending deformation of solid-liquid interface in the solidification process for continuous casting slab, the variation of temperature gradient and dendritic spacing in the front edge of the solid-liquid interface, and the nucleation and propagation process of crack were studied. It is shown that the bending deformation of the interface results in the temperature field change in the front edge of solid-liquid interface, and the occurrence of temperature gradient along drawing direction results in the growth of secondary dendrites. The initial crack formed during the middle and final stage of solidification may extend to the surface of the casting slab and become an internal crack. The results of the theoretical analysis are basically in agreement with that of the experiment.     

20钢渗硼过程中硼化物形核和生长的TEM观察及室温形变的影响SCIEI

本文采用单向减薄制样法在透射电镜下直接观察了20钢渗硼初期硼化物的形核和生长特性及室温形变的影响。X射线及电子探针分析结果表明:渗硼初期试样表层仅有Fe_2B形成;表层硼原子浓度与形变量之间具有单调增长的关系;偏聚于位错胞壁之中的硼原子阻碍了形变组织的恢复和再结晶,加速了硼化物的形核和长大。     

A STUDY OF TEMPERATURE-DEPENDENT VALENCE BOND STRUCTURE OF TITANIUM

On the basis of energy and shape method for the determination of the valence bond (VB) structures of crystal, the valence bond structure of titanium is redetermined at room temperature and calculated in the whole temperature range of 0-1943K. The outer shell electronic distribution of Ti is e_c~(2.9907) · (s_c~(0.4980) d_c~(2.4927)) ef1.0093 in crystal. The temperature dependences of the VB structures of hcp and bcc phases are the same. The VB structures of hcp and bcc phases monotonically increase or decrease with the increase in temperature, but show discontinuous changes at the phase-transformation temperature 1155K.     

Influence of Fe on Microstructure and Mechanical Properties in Pdoped Ni–Cr–Fe Alloys

The influence of Fe on the microstructure and mechanical properties of P-doped Ni–Cr–Fe alloys has been investigated.Results showed that increasing Fe content refined the dendrite microstructure and enhanced the solubility of P in as-cast alloys. The change of microhardness in different dendrite regions was attributed to the segregation of P atoms in solid solution state, which had strengthening effects. Increasing Fe contents from 15.2 to 60.7 wt% reduced the yield strength and tensile strength but had little influence on the elongation of alloys. The stress rupture life of alloys after heat treatment decreased with the increment of Fe contents, and the failure fracture modes transferred from transgranular to intergranular fracture mode. The change of fracture modes was due to the weakness of grain boundaries caused by the increment of Fe.In addition, the precipitation of M_(23)C_6 was believed to be related to the segregation of P toward grain boundaries, which led to the fluctuation of carbon and chromium atoms near the grain boundaries in alloys with low Fe contents. Consequently, the increment of Fe decreased the strength of matrix and changed the existence of P atoms and the precipitates at grain boundaries.     

Antimony Induced Crystallization of Amorphous Silicon

Antimony induced crystallization of PVD (physics vapor deposition) amorphous silicon can be observed on sapphire substrates. Very large crystalline regions up to several tens of micrometers can be formed. The Si diffraction patterns of the area of crystallization can be observed with TEM (transmission electron microscopy). Only a few and much smaller crystals of the order of 1μm were formed when the antimony layer was deposited by MBE (molecular beam epitaxy) compared with a layer formed by thermal evaporation. The use of high vacuum is essential in order to observe any Sb induced crystallization at all. In addition it is necessary to take measures to limit the evaporation of the antimony.     

Study of colored anodized aluminum with calcon in sulfuric acidic solution using cyclic voltammetry and impedance measurement methods

The effect of coloring condition of Al with Calcon (sodium 2,2'‐dihydroxy‐azonaphthalene‐4‐sulfonate), on the corrosion resistance of Al in 0.1 M sulfuric acid solution was studied, using cyclic voltammetry and measurement of impedance noise methods. The changes in the corrosion resistance of colored aluminum electrodes were evaluated by measuring the magnitude of impedance and cyclic voltammetric responses of anodized and colored electrodes. An irreversible corrosion response was observed at the cyclic voltammogram of the colored aluminum electrode. The current and threshold potential of corrosion responses strongly depends on the applied conditions during anodizing, coloring and sealing stages. In addition, significant changes in impedance at the ac voltammogram and noise level at some ac frequencies were observed, when the electrodes were colored under various conditions. In this regard, the surface of the electrode was studied by Scanning Electron Microscopy (SEM). Comparison of SEM images of the colored and uncolored aluminum specimens showed that the colored surface contained a significant numbers of pits. The results indicated that coloring aluminum with Calcon could reduce corrosion resistance of aluminum and increase roughness of the oxide film.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

FE Simulation of Center Crack Occurrence in Tube Rounds During Two-Roll Rotary

With the aid of FE (finite element) code MSC.Superform 2005, 2-D coupled thermo-mechanical simulation of center-crack occurrence in round billet during 2-roll rotary rolling process was presented using Oyane ductile fracture criteria. A simple modeling is put forward based on the spiral motion of the workpiece as an essential characteristic in movement. The influence of the feed angle and the entry cone angle of the main roll on the process was taken into account in the modeling. The soundness for simplifying the 3-D rotary rolling into a 2-D problem was discussed. By adopting the parameters of Diescher piercer in 140mm mandrel mill of Bao Steel, the distribution and development of strain / stress were analyzed, and the eigen value of ductile fracture as well. The critical percentage of diameter reduction was obtained from the simulation. The result showed a good agreement with the experimental value, and therefore was of widely guiding significance to the practical process for rationally formulating the deformation parameters of steel tube piercing.