TC4合金管材挤压成型工艺研究

研究了不同的挤压温度、挤压比和挤压速度等挤压参数对TC4合金管材挤压成型工艺的影响,以及润滑方式对TC4合金挤压管材表面的影响。研究结果表明,采用热挤压方式生产φ47mm×3mmTC4合金管材,挤压比应选在3￣10之间,挤压速度选在50￣120m/s,润滑剂用玻璃粉,可得到显微组织为两相加工组织,变形充分均匀,力学性能匹配良好,表面质量合格的TC4合金管材。本研究得到的TC4合金管材挤压成型工艺研究可用于工业化生产。     

剪切变形方向特征对高纯铝箔轧制织构的影响

运用取向分布函数(ODF)研究了每个轧制道次的剪切变形特征对高纯铝箔轧制织构的影响.提出用中性角的相对大小来量化轧制剪切变形作用方向改变的位置,运用Taylor晶体塑性变形理论模拟计算了中性角的相对大小对轧制织构演变的影响.实测与模拟的轧制织构特征表明:中性角靠近轧制变形区的中心位置有利于形成{001}<110>剪切织构,从而证实了除剪切变形的程度外,剪切变形方向改变的位置也是影响高纯铝箔轧制织构的重要因素.     

外啮合齿轮泵传动轴设计的参数化研究

利用UG软件提供的表达式和优化模块，能一次成功地优化出外啮合齿轮泵传动轴和联接花键的基本参数，从而避免了传统的“先试算后校核再调整”的做法。进而利用UG软件的主模型功能，可以很方便地实现上述设计的完全参数化，所得结果与已有结果比较吻合。     

钒氮微合金化热轧带肋钢筋径向组织分布特征

通过用金相、扫描电镜等方法观察得出,钒氮微合金化热轧带肋钢筋肋部主要由细小的铁素体晶粒、片层较细的珠光体和少量离异珠光体组成;其基体组织是沿钢筋纵向呈明显条带状分布的铁素体和珠光体。同时,定量测量了铁素体条带密度、铁素体晶粒尺寸、珠光体体积分数及其片层间距沿径向的分布情况,并分析了铁素体晶粒尺寸和珠光体体积分数在芯部反常分布的原因。     

Eddy current measurements of electrical conductivity and magnetic permeability of porous metals

This paper presents a method, which simultaneously estimates the electrical conductivity and magnetic permeability of porous metals. Porous Cu and Fe manufactured by the lost carbonate sintering process have been tested. An air-cored solenoid coil was designed for the measurements of rod-shaped samples when inserted coaxially with the coil. It was theoretically found that the phase-frequency response of the normalised eddy current signal of the coil is virtually independent of the radius, electrical conductivity and magnetic permeability of the test samples. For non-magnetic, conductive porous Cu, the electrical conductivity was measured with a calibration curve of the coil relating the impedance change and the electrical conductivity of the sample. For magnetic porous Fe, the imaginary part of the signal at the lowest frequencies can be used to estimate the permeability. The measured conductivity values of the porous Cu are shown in the paper in comparison with that of bulk materials with known conductivity. The measured permeability values of the porous Fe are given and the sample-length effect on the measurements is also discussed.     

基于小波变换的超声信号自适应消噪方法研究

超声检测中，特定的缺陷回波信号一般都有一定的相关性，因而可利用自适应噪声抵消来增强缺陷回波信号。针对最小均方（LMS）算法自适应噪声抵消的缺点，提出了基于小波变换的自适应噪声抵消方法，通过Matlab软件将该算法应用于超声缺陷信号的仿真处理。结果表明，该算法大大提高了缺陷回波信号的信噪比，且具有较高的缺陷定位精度和纵向分辨率。     

Model of intense pulsed ion beam and simulation study of energy deposited on target

Gaussian type models have been established according to the real detected voltage of magnetically insulated ion diode and intense pulsed ion beam density near the focus of the diode. The energy deposition of Al target irradiated by intense pulsed ion beam has been simulated by Monte Carlo method based on these models. The results of energy depositions of the irradiation of single energy ions and the Gaussian distribution IPIB have been obtained. Especially cases of ion beam irradiating Al target at different angles on one dimension and two dimensions are discussed. The evolution processes of the energy deposition of ions in target have been simulated during a pulse. In addition, incident angles of H⁺ ions and C⁺ ions ranging from 20 to 40° have been researched. We obtained the conclusions that C⁺ ions of the beam affect the physical properties of near surface region, but H⁺ ions affect the deeper layer. The energy of intense pulsed ion beam mainly deposits on target surface, so melting and evaporation begin both from target surface.     

低成本钛合金制备技术研究进展

为了降低钛合金的生产成本,美、俄、日、中等国家都在此领域进行了广泛的研究。对国际上新出现的以降低钛合金生产成本为目的的新冶金方法、新的低成本合金化钛合金和新的加工生产技术进行了综述。目前,国际上研究较为活跃的低成本钛冶炼新方法有FFC剑桥法、Armstrong工艺、EMR复合阳极工艺、SRI工艺、Idaho钛工艺及OS工艺。其中,以FFC剑桥法为代表的TiO2直接电解还原方法,最有希望成为替代传统Kroll工艺的新方法。     

铋系高温超导带材内部组织结构分布不均匀的分析

观察了Ｂｉ—２２２３带村内部组织结构的变化。测定了带材内导电性能不均匀和轧制及冷压过程变形不均匀的关系     

等离子喷涂纳米Al2O3-13%TiO2涂层组织与性能

采用大气等离子喷涂方法制备了纳米结构Al2O3-13%TiO2(质量分数,下同)涂层,进行了SRV滑动磨损试验,通过扫描电镜对涂层的断口显微组织及磨损表面形貌进行了观察,并测定了涂层的显微硬度.结果表明,该纳米涂层具有独特的显微组织结构特征,层片间具有冶金结合特征的界面较多,界面结合得到明显改善,其显微硬度明显高于微米涂层,具有优良的耐磨性能,其磨损面积仅为常规微米涂层的1/5,界面结合改善是耐磨性提高的主要原因.