6061铝合金自行车刹车钳压铸工艺

介绍一种6061铝合金零件压铸的新工艺。内容包括：流变制浆，慢压射压铸，内浇道、直浇道设计，主要围绕合金熔炼、模具设计和压铸阶段，针对影响铸件气孔率的相关主要因素。加以阻止或控制。其它常规的工艺设计和操作应相互协调，如：涂料，压力、压速的调配，充分有序的充型与排泄等。试验效果显著，实现了6061铝合金压铸件气孔率的根本改善，热处理合格率达到80％～90％以上。     

饰品金合金微量添加元素研究现状

从提高强度、防止氧化、提高铸造性能以及细化晶粒几个方面综述了饰品金合金中微量添加元素的一些研究现状。对不同微量添加元素对饰品金合金性能的影响、相应的副作用,作用机理以及加入量的确定等方面进行了综合评述。并对饰品金合金微量添加元素的发展进行了展望。     

Effect of heat treatment on microstructure and properties of hot-extruded nickel-aluminum bronze

The effect of heat treatment on the microstructure and properties of a hot-extruded nickel-aluminum bronze was investigated. Experimental materials were heat treated through different processes, including quenching, normalizing, aging and annealing, and their microstructure, corrosion resistance and mechanical properties were characterized. It is found that quenching causes all β phase transformed into β phase, however, normalizing causes β phase transformed into β α and κ phases. When the quenched sample is aged, fine phase is precipitated from the as-quenched microstructure of β＇ phase. Annealing causes the transformation of β into a and κ phases. The results of mechanical property tests show that quenching, normalizing and aging improve the tensile strength and hardness of the experimental material, with a corresponding fall in elongation. Annealing raises the elongation but reduces the tensile strength and hardness. Furthermore, corrosion resistance of nickel-aluminum bronze ranks from worse to better in the following order： aged, quenched, normalized, hot-extruded and annealed. However, with the exposure time of corrosion test increasing, the difference of average corrosion rate between those nickel-aluminum bronzes tums small.     

Numerical simulation of microstructure formation ofAZ91 using mCA method

A stochastic model for simulating the microstructure formation of Mg alloy AZ91 during solidification was developed based on the finite element method（FEM） for macroscopic model of heat transfer calculation and a modified Cellular Automaton （mCA） for microscopic modeling of nucleation, growth of crystal. In this model, the effect of solute redistribution, interface curvature and preferred orientation was considered. A numerical simulation was developed with C＋＋ program language. The computation was carded out to understand the effect of varying processing parameters, such as nucleation parameters and heat transfer coefficient, on the microstructure formation of AZ91. The result of simulation was displayed on screen.     

TA2／A3爆炸复合界面微观断裂机制的SEM原位研究SCIEI

借助ＳＥＭ对ＴＡ２／Ａ３爆炸复合界面（包括细小波状界面，中波界面及具有再入射流熔块的大波界面）的微观断裂机制进行了动态研究。结果表明，爆炸复合界面微观断裂机制是：微裂纹在波头夹杂或再入射流熔块内及熔块和基体界面处萌生，并在裂尖应力场作用下沿与外载垂直方向扩展。同时，沿ＴＡ２／Ａ３界面产生微裂纹并在外载作用下，相互连接而扩展。     

带材的纠偏控制

本文对带钢生产线上常见的带材跑偏现象，进行了详细的分析。对带钢跑偏的原因，进行了研究。同时，对带钢跑偏应采取的措施，也给出了相应的方法。     

复吹转炉“留渣 双渣”脱磷工艺试验

摘要：在国内某转炉钢厂采用“留渣 双渣”工艺技术进行脱磷工艺试验。结果表明：随着转炉前期脱磷率不断升高,终点脱磷率不断提高。铁水硅含量对前期脱磷率的影响最大。根据铁水成分,在冶炼前期适当降低供氧强度、降低气固氧比、加入适量石灰及烧结矿,均有利于前期脱磷率的提高。在一倒时每吨钢液加入4~8kg石灰,不影响出钢温度,可提高一倒-终点阶段脱磷率,同时可提高终点脱磷率。从终点的控制效果可知,终点炉渣碱度应保持不小于3.0,炉渣中FeO质量分数在16%~20%,并适当降低终点出钢温度在1610~1630℃,有利于终点脱磷率的提高。通过加强熔池搅拌,促进钢渣反应趋于平衡,有利于终点磷分配比提高,从而可进一步提高终点脱磷率。     

磁粉探伤焊缝区反常显示成因分析

研究了中碳钢焊缝区磁粉探伤出现的假磁痕,对焊接过程和焊缝组织进行分析,制订出合理的焊接工艺,避免表面缺陷检测的误判。     

锆基块体非晶合金的力学性能研究进展

本文叙述了锆基块体非晶合金的制备方法，优异的性能，特别是对其力学性能研究领域的最新进展进行了综述。并与传统晶态合金作了适当的对比，锆基块体非晶合金具有优异的力学性能，如弹性比功、超塑性、断裂韧性等，此类合金的应用将不断拓宽。     

Stress relaxation behavior of Ti-6Al-4V alloy

1　INTRODUCTIONTi 6Al 4VisoneofthemostimportantTial loys[1,2 ] .Butthisalloyhasbadformabilityforitshighelasticresilience .Therefore ,hotsizingisimpor tant[36 ] .Asthebaseofhotsizing ,thestudyofstressrelaxationhasimportanttheoreticalvalueandpracticalsignificance .Ontheotherhand ,Ti 6Al 4Visusedasfastenermaterialssometimes .Whenthefastenersworkatthetemperaturehigherthanroomtemperature ,stressrelaxationmayresultsinacci dents .Sohowtopreventthestressrelaxationisveryimportant[7] .Uptonow ,…