Flow Stress Model of Stainless Steel OCr13Ni5Mo at Elevated Temperature

For a more accurate forming calculation and numerical simulation of hydraulic turbine blade,experimental studies on the flow stress of stainless steel OCr13Ni5Mo were carried out upon Gleeble-1500 thermal simulator under different deformation conditions.The results then were analyzed and the effects of all influencing factors were summarized consequently.New mathematic models were conceived.Utilizing the software Matlab,regression coefficients were calculated by the least square method.The model has an eminent capability of curve-fitting performance with impact structure whose correlation coefficient is up to 0.908 0 and the cosine coefficient is 0.995 8.All mathematic models and process parameters can be used in engineering calculations or computer simulations.     

一种改进的Ni—PTFE化学复合镀工艺

针对传统Ni—PTFE化学复合镀工艺的规律和不足,经过对试剂和工艺参数的筛选,改进配方和工艺条件,提出了一种经过改进的Ni—PTFE化学复合镀工艺,获得了在厚度、力学性能和稳定性方面均有较大提高的化学复合镀层。     

4Cr14Ni14W2Mo气门锻造裂纹控制

以150系列大功率高速柴油机气门电热镦模锻为研究对象,分析和研究了4Cr14Ni14W2Mo合金钢气门电热镦锻造裂纹产生的原因和机理,提出了减少其锻造裂纹缺陷的方法。     

纳米金属Ni的塑性变形机制

为了深入探讨纳米金属的力学性能特别是塑性变形机制，对纳米金属Ni进行了不同程度的冷轧变形．通过x射线衍射分析和透射电镜观察对纳米金属Ni的微观结构和变形机制进行了研究，并对不同变形量下的晶格常数进行了计算．研究表明，随变形量增大，纳米晶体的晶粒尺寸逐渐增大，从最初的16．6nm增大到28．7nm，这种增长是由于部分方向（区域）晶粒长大的结果；变形量较小（小于30％）时，位错的活动与晶粒旋转是的变形主要方式，变形量较大（超过30％）时，晶界发射不全位错与孪晶的交互作用协调变形；纳米Ni的平均晶格常数为0．3533nm，略高于粗晶Ni的晶格常数．     

1Cr18Ni9Ti不锈钢热镦成形工艺的研究

以1Cr18Ni9Ti奥氏体不锈钢热镦粗锻造工艺为例,通过Gleeble-1500热模拟试验机和金相显微镜等手段,研究了工艺参数对1Cr18Ni9Ti热镦成形的影响,结果表明温度、应变速率、变形程度对热镦成形过程的流动应力和变形后试件的晶粒大小、硬度具有明显的影响规律,对于控制奥氏体不锈钢的锻造性能具有重要的指导意义.     

新型NCV1系列电压传感器

分析了高导磁环形镍铁合金线圈在方波电压下的工作过程，论证了这种线圈构成的电压传感器有极快的响应时间；介绍了该系列电压传感器的主要技术参数以及运用情况。     

Ni／MH电池负极材料—贮氢合金的研究概况

简述了Ni/MH电池的原理和应用，对Ni/MH电池负极材料的基本类型及开发历史和发展现状进行了综合评述，AB5型合金的开发和应用已较为成熟，但其贮氢容量不高，AB2型合金与A2B型（Mg基）合金的贮氢容量较高，但AB2型合金活化困难，高倍率放电低于AB5型合金，尚未得到广泛应用，A2B型合金虽然成本低，但循环稳定性较差，循环寿命短，尚未实现实用化，V基固溶体型合金同样也存在循环寿命短的特点，AB23型合金由于具有较高的容量并易被活化引起越来越多的研究。     

舵传动拉杆常用材料腐蚀试验

针对目前舵传动拉杆容易腐蚀的问题,对0Cr17Ni4Cu4Nb、18Cr2Ni4WA等几种常用不锈钢材料进行了腐蚀试验对比分析,实海潮差腐蚀、盐雾/干/湿交替循环腐蚀、动电位极化及人工海水全浸腐蚀试验结果表明,0Cr17Ni4Cu4Nb材料可用于拉杆耐腐蚀材料并优于目前舷外拉杆材料。     

INFLUENCE OF SURFACE MORPHOLOGY ON THE MICROHARDNESS OF ELECTROLESS Ni-B DEPOSIT REVEALED BY AFM OBSERVATION

Introduction　　 Electroless Ni- B alloy has many advantagessuch as superior hardness,excellent wear- resis-tance and some special electrical and magneticproperties[1,2 ] . It can be prepared with eitherDimethylamineborane( DMAB) or sodium borohy-dride as reductant[3 ,4] .The deposits with lowerboron contentwhich are mainly applied to electron-ic industry[5] are prepared by DMAB.While sodi-um borohydride can bring about higher boron con-tent deposits which are chiefly used as wear- resis-…     

Synthesis and Characterization of Nanostructured Fe-Ni Alloy Whisker

The nanocrystalline γ - ( Fe, Ni) alloy whiskers have been prepared by chemical reduction of Fe 2+ and Ni 2+ ions with potassium borohydride under the function of a dispersant agent PE followed by heat treatment at 600℃ under the protection of nitrogen . Conditions, such as quantity of NaOH, concentration of salts, and species of surfactants, of preparation of Fe - Ni alloy have been discussed. X-ray diffraction ( XRD) , transmission electron microscopy ( TEM ) and vibrating sample magnetometer (VSM) characterized the synthesized Fe-Ni alloy. Character, capability and use of the materials have been summarized.