镍基合金激光直接制造的显微组织与缺陷分析

采用FGH95镍基高温合金粉末进行激光直接制造工艺实验，研究了不同工艺参数对表面形貌、显微组织和显微硬度的影响。结果表明，成形件表面平整无变形，显微组织为细小而致密的柱状晶。有层内生长和外延式生长两种生长方式。同时对其中出现的缺陷也作了研究分析，得到了优化的工艺参数。     

Studies on Preparation of Onion-like Fullerenes by Vacuum Heat-treatment

Onion-like Fullerenes were produced at high-temperature in vacuum. The morphology of the carbon nano onion-like fullerenes was examined and characterized by high-resolution transmission electron microscopy (HRTEM). It can be seen that the nano-sized, onion-like fullerenes possess high degree of graphization. The results suggested that the catalyst is the main factor affecting the size and yield of the fullerenes. The method is very promising for simple mass production.     

SiC连续纤维增强Ti基复合材料界面反应扩散研究进展

介绍了目前研究Ti基复合材料界面反应扩散模型、界面反应的动力学和热力学、界面反应扩散控制机理。以及障碍涂层对界面反应扩散的影响。指出SiC纤维增强Ti基复合材料界面反应扩散的研究重点和发展方向。     

基于QFD质量工具集成的研究与应用

为消除产品设计制造过程中可能存在的冲突、模糊、潜在失效等因素的影响，将各种质量工具、方法与质量功能展开（QFD）进行集成研究。通过分析QFD与各种质量工具的关系，提出了一个支持产品开发的、集成的QFD系统模型，给出了产品设计与制造各阶段问题解决的方法和工具，并开发了集成的QFD软件系统（1QFDS）。通过IQFDS在起重设备的卷筒设计中的应用，表明采用集成化的QFD系统，不仅可以克服QFD所存在的缺陷，而且可优化产品的设计与制造过程。改进和提高质量水平，进而满足顾客需求。     

1.4%C超高碳钢显微组织与疲劳性能的研究

对1．4％C超高碳钢试样热处理后的疲劳极限与断裂韧性进行测定，观察了显微组织与试样断口。结果表明，经950℃淬火700℃回火热处理后，又经860℃正火处理，试验用钢的组织结构超细化且碳化物弥散均匀分布，获得良好的综合强度与韧性及较高的疲劳极限，断裂强度较40CrNiMo调质态提高48％，屈服强度提高15％，延性指标相当，是一种优良的结构钢材料。     

轧机压下螺纹副不等厚螺牙面力场的多极边界元解析

运用三维弹性摩擦接触多极边界元对3500中厚板轧机压下螺纹副进行面力场的数值解析.通过中径定位下的等厚和不等厚螺牙的计算,得到螺牙接触面的径向、周向摩擦力的分布及特点,为中厚板轧机螺纹副螺母损坏及滑动提供数值参考.     

变频调速传动系统的电磁兼容分析

在变频调速传动系统中,变频器会产生和受到各种电磁干扰。本文分析了变频调速传动系统的主要电磁干扰源和耦合途径,并阐述了抑制其电磁干扰的措施。     

Fe－Nb－C合金的高温内耗

测量了高纯Ｆｅ－Ｎｂ－Ｃ合金的４００－８５０℃内耗，发现一个峰温度随测量应变振幅变化的高温（６６６－７４０℃）磁机械滞后阻尼内耗峰。研究了峰的特征、出现、消失条件及升降温、频率、振幅、变形与退火等因素对峰的影响．提出了用内耗实验确定材料中阻碍铁磁畴壁Ｂａｒｋｈａｕｓｅｎ跳动应力的方法和合金中产生磁机械滞后阻尼－温度峰（Ｑ_ｍ~（－１）－Ｔ）的物理机制。     

THERMAL DEMAGNETIZATION AND RANDOMNESS OF DOMAIN NUCLEATION OF SINGLE PHASE Nd_2 Fe_(14) B

Based on the observation of temperature variation of both domain structure and magnetic con-trast.the thermal demagnetization and randomness of domain nucleation was discussed.     

PREPARATION OF TEM THIN FOIL CONTAINING POWDER PARTICLE BY ELECTRODEPOSITION METHOD

A practical technique to prepare transmission electron microscopy （TEM） thin foil containing powder particle was described and the data for the codeposition of two type particles with copper in the electroplating were presented. By depositing the particles which were distributed in CuSO4 electrolyte on cathode together with Cu^2＋ in electrodeposition bath, composite coating with suitable thickness could be formed. The thin coating was separated from the substrate and cut into a disc with diameter of 3mm for electropolishing. When the Cu matrix was thinned during electropolishing, the particles contained in the coating plate were also thinned to meet the suitable thickness for TEM observation. Various experimental results revealed that during electrodepositing the current density, pH-value of electrolyte and stirring mode all have significant effects on the distribution of particles in composite coating and the surface quality of the composite coating. The proper parameters used during electrodepositing to prepare TEM thin foil containing powder particle were discussed.