用含Pb、As、Sn地方生铁砂型铸造生产D型石墨铸铁的研究

基于Ph、As、Sn等元素有增大铁液过冷倾向的作用，利用含Ph、As、Sn的地方生铁，采用合金化和砂型铸造可以获得D型石墨铸铁，对其工艺方案进行了研究。用正交试验法设计试验方案，得到最佳工艺方案为：在亚共晶成分（WB％：3．2C，2．1si）的铁液中加入适量的铝（0．6％）和钛（0．8％），可以得到含有100％D型石墨的铸铁，其抗拉强度最高可达276MPa。     

基于单片机控制的晶闸管交流弧焊机的研究

采用8031单片机控制晶闸管交流弧焊机，通过PID控制算法及计算机仿真，使参数优化，性能改善，功能增强，提高了焊机的智能化水平。     

Cu-Zn-Al形状记忆合金直接淬火和分级淬火后马氏体稳定性的研究SCIEI

用透射电镜,X射线衍射仪和电阻法研究了Cu-14.84wt-％Zn-7.75wt-％Al形状记忆合金在直接淬火和分级淬火后马氏体的稳定性。试验结果表明,直接淬火和分级淬火(150℃,2min)后于室温时效约3h的马氏体均为M18R结构,但刚直接淬火后马氏体并不稳定,其某些衍射峰位置和电阻率均随室温时效而变化;而分级淬火(150℃,2min)后马氏体是稳定的,其所有衍射峰位置和电阻率几乎不随室温时效而变化。上述结果可用“马氏体再有序化机制”解释。     

缓蚀剂对316L不锈钢在酸性氯离子溶液中应力腐蚀开裂的作用

研究表明316L不锈钢在55℃的1mol/L HCl+1mol/L NaCl溶液中对SCC比较敏感。316L不锈钢在所研究的体系中处于活化溶解状态。对添加缓蚀剂的体系的电化学参数的测试和分析表明,缓蚀剂抑制SCC的能力与缓蚀剂抑制阳极反应有关。     

磁场作用下铁在盐酸和氯化钠溶液中自腐蚀状态的变化

采用自腐蚀电位测量及恒电位极化法研究了磁场对铁在酸性与中性氯化的溶液中自腐蚀状态的作用。外加磁场使自腐蚀电位正移，撤去磁场使自腐蚀电位负移，没有磁场时在自腐蚀电位下极化然后外加磁场会导致磁致阴极电流；有磁场时自腐蚀电位下极化然后撤去磁场会导致磁致阳极电流。酸性溶液体系的磁致阴极电流值明显大于中性溶液体系，表现出磁场主要通过作用于析氢反应而影响自腐蚀状态。     

基于双谱估计的滚动轴承故障特征的研究

提出了基于双谱估计的滚动轴承诊断的方法。利用双谱函数做出滚动轴承故障信号的特征图谱，并加以分析。实验表明，双谱可以敏感地监测滚动轴承故障的出现，并且可以有效地识别滚动轴承不同的故障特征。     

Dissolution mechanism of solid nickel in liquid zinc saturated with Fe

The dissolution behavior of solid nickel in static liquid zinc saturated with Fe at 723 K was studied. The results show that when immersing solid Ni in liquid Zn saturated with Fe, the intermetallic compound layers consisted of γ and δ phases are formed on nickel substrate, which is the same as that in liquid pure zinc. However, some F2 particles are formed in the liquid near the solid/liquid interface. These Г2 particles can easily heterogeneously nucleate on （particles and grow fast. The dissolution process is governed by diffusion of nickel atom across a concentration boundary layer in liquid Zn saturated with Fe, and is different from a mixed control mechanism of nickel in liquid pure zinc. The participation of Г2 particles makes the dissolution of solid Ni in the liquid accelerated.     

Microstructure of ternary Zn1-xCdxO films on silicon substrate

Ternary Zn1-x CdxO alloying films were deposited on silicon substrates by a reactive magnetron sputtering method. The structures of the films were characterized by transmission electron microscopy(TEM) and X-ray diffraction(XRD) analysis, respectively. The XRD measurement shows that the wurtzite-type structure of Zn1-xCdxO can be stabilized up to Cd content of x=0.53 without a cubic CdO phase separation. The TEM measurement shows that the films have a columnar structure and the grains are highly c-axis oriented perpendicularly on silicon substrate although some grain boundaries are slightly tilted. High resolution TEM observation indicates that a native layer of amorphous SiO2 exists at the ZnCdO/Si interface and that ZnCdO grains with c-axis preferred orientation nucleate directly on substrate surface.     

熔池表面变形对电弧行为特征的影响

在电弧与熔池统一模型的基础上研究熔池上表面变形对电弧行为特征的影响。用本模型计算出的平坦熔池表面电流密度和热流密度的分布与试验结果显示了很好的一致性。而变形熔池表面的电流密度和热流密度分布则不再符合近似的高斯分布。这就为下一步研究电弧和熔池的工作提供了基础。     

直齿轮精密塑性成形时齿面裂纹的产生机理及控制方法

本文通过对内齿轮缩挤成形工艺的有限元模拟 ,分析了直齿轮成形时齿面裂纹的产生机理 ,并从理论上进行了解释 ,进而提出了防止齿面裂纹产生的方法