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。     

冰箱门面板冲压工艺分析及模具设计

分析冰箱门面板的冲压工艺,介绍模具设计中应注意的问题及滚压式结构的特点     

坯料外形对镁合金矩形盒拉深成形的影响

用商业有限元软件模拟了在同一套模具和成形条件下不同毛坯外形的镁合金矩形盒拉深成形过程．依据数值模拟结果，分析了不同坯料外形对镁合金矩形盒拉深成形的影响。结果表明：使用矩形圆角坯料比其他坯料的成形性能好。     

对Al-Cu合金中α-Al及Al2Cu生长行为的探讨

研究了Al-Cu合金中α-Al和Al2Cu的生长行为,分析了初生α-Al及初生Al2Cu作为共晶核心形核的能力.结果发现,在过共晶组织中,初生相Al2Cu形貌大部分有明显的拐角,观察其平面有的呈矩形,呈现小面生长特性.而α-Al与Al2Cu共晶生长时,Al2Cu择优生长特征削弱,与α-Al耦合生长呈现非小面-非小面生长,表明Al2Cu在不同的生长阶段表现出的生长行为不同.在亚共晶组织中,初生相α-Al周围形成离异共晶的Al2Cu,而过共晶组织中初生相Al2Cu周围没有离异共晶的α-Al,表明初生相Al2Cu作为共晶层片核心的能力比初生相α-Al作为共晶层片核心的能力强.     

A novel electroless silver depositing method for magnesium alloys

Depositing silver on magnesium alloy by both electroless plating and organic coatings was studied. The organic coating was made by immersing samples in organosilicon heat-resisting varnish. In this method the organic coating acts as interlayer between the substrate and silver film. When the reaction starts, silver deposits directly on the interlayer. X-ray diffraction and SEM analysis were used to determine the composition and morphology of the interlayer and silver film. The potentiodynamic polarization curves for corrosion studies of coated magnesium alloys were performed in a corrosive environment of 3.5% NaCl（mass fraction） at neutral pH （6.9）. The results indicate that compared with the substrate, the corrosion resistance of coated magnesium alloys increases greatly. Moreover, the method proposed in this work is environmentally friendly, non-toxic chemicals were used. In addition, it provides a new concept for the corrosion inhibition of magnesium alloys.     

高耐蚀性热镀锌板的钝化处理工艺探讨

介绍了热镀锌板钝化膜的形成机理 ;针对攀钢热镀锌板出现白锈、黑斑等问题 ,分析了钝化液pH值、添加剂及操作条件对钝化膜质量的影响 ,同时提出了改进热镀锌板耐蚀性能的措施     

射线检测中运动模糊图像的恢复

X射线实时成像检测中,若曝光时间内工件和X射线图像采集设备有相对线性运动,会造成图像运动模糊降质。提出利用运动模糊点扩展函数的频域特征和Hough变换得到模糊图像的运动方向,并将之旋转到水平轴方向,利用差分法求解运动模糊点扩展函数的长度。并用Wiener滤波的方法,恢复降质的图像,取得了较好的效果。     

Microstructure Evolution of Intermetallics Produced by Laser Powder Deposition

NiAl intermetallic alloys are potential high temperaturestructural materials in aeronautical and astronauticalindustries[1].However,the poor ductility andtoughness at room temperature severely restrict theirengineering applications[2,3].It is important todevelop new technology to product intermetallicmaterials for the improvement of the comprehensiveproperties and the workability.Laser powder depositionhas been used to synthesize many new materials.Furthermore,if incorporated with rapid proto…     

EFFECT OF γ-IRRADIATION ON CuZnAl SHAPE MEMORY ALLOY

用透射电子显微镜和正电子湮没等分析手段,研究了CuZnAl形状记忆合金的γ辐照效应,此合金经一定剂量的γ辐照后,马氏体转变温度明显提高,而形状记忆功能仍保持不变。