热轧超细颗粒钢用环境友好型润滑剂的研究

通过对基础油、油溶性添加剂和固体润滑添加剂的高温(100～500℃)减摩性能和高温(100～700℃)承载能力的研究发现：当试验温度低于300℃时，基础油菜籽油、油溶性添加剂硫化油脂和磷酸酯的摩擦因数比较低，但当试验温度大于300℃时，其摩擦因数都非常高；固体润滑剂滑石粉在100～500℃时具有较低的摩擦因数，而非层状固体润滑剂硫酸钠具有非常优异的高温承载能力。以菜籽油为基础油研制的热扎超细颗粒钢添加剂具有低温高摩擦和高温低摩擦特性，100℃时的摩擦因数为0.31，700℃时的摩擦因数为0．20。     

聚酰胺酰亚胺涂层添加润滑剂对其摩擦性能的影响

目的研究固体润滑剂对聚酰胺酰亚胺(PAI)涂层摩擦磨损性能的影响。方法由偏苯三酸酐(TMA)和4,4-二苯甲烷二异氰酸酯(MDI)合成并添加二硫化钼、二硫化钨、石墨制备自润滑PAI涂层,并对其用HSR-2M型高速往复摩擦试验机进行磨损实验。结合ATR-FTIR、TA-TG热重、磨痕形貌等表征手段,对自润滑PAI涂层摩擦性能进行表征,探究了固体润滑剂的种类与含量对聚酰胺酰亚胺涂层摩擦性能的影响。结果载荷与PAI涂层的摩擦系数呈反比例关系,当Mo S2含量达到30%时,PAI涂层的摩擦系数降至0.1744。添加固体润滑剂后,PAI涂层的摩擦系数减小,磨痕宽度变窄,磨痕变浅,表面粗糙度相对较低。结论具备最佳摩擦性能的涂层添加了30%Mo S2,添加10%石墨的涂层次之,添加10%WS2的涂层较好。添加固体润滑剂可明显提高PAI涂层的摩擦磨损性能,增加其使用时长。     

板带钢卷取机摩擦衬板的镶嵌式固体润滑材料研究

介绍了板带钢卷取机卷筒棱锥轴与扇形块之间镶嵌式摩擦衬板固体润滑材料研究.根据板带钢卷取机卷筒的摩擦衬板的实际工况要求,选用聚四氟乙烯(PTFE)、二硫化钼和石墨作为固体润滑材料,通过正交试验法,确定了锡青铜摩擦衬板的镶嵌固体润滑材料的种类及组分配比.研究表明,镶嵌固体润滑材料的锡青铜摩擦衬板的摩擦系数明显降低,并使其耐磨性提高两个数量级以上,而且没有发生严重的磨损失效现象,完全可以满足卷取机的工作要求.     

陶瓷及其复合材料在干摩擦条件下的摩擦学性能研究现状

综述了陶瓷自配副、陶瓷间配副以及陶瓷/金属摩擦副干摩擦磨损性能的研究现状，并对自润滑陶瓷及其复合材料的研究现状，以及固体润滑技术在陶瓷自润滑材料研究中的应用情况做了概述。     

金属钼层表面渗硫层的表征与减摩耐磨性能研究

对厚约3pm的金属钼薄膜进行低温离子渗硫处理，得到了单质金属钼与固体润滑剂二硫化钼（MoS2）共存的复合固体润滑渗硫层。利用SEM和EDX分析了复合渗硫层表面、截面及磨损面的形貌及成分分布，用XPS分析了复合渗硫层表面化合价态，用纳米压痕仪测定了复合渗硫层的硬度及弹性模量。摩擦磨损实验表明，该渗硫层是一种非常理想的摩擦表面，具有优异的减摩耐磨抗擦伤性能。离子渗硫技术为原位合成固体润滑剂MoS2提供了一种新方法。     

镁合金板料数控热渐进成形时的摩擦和润滑性能

利用数控实验机床和摩擦实验研究AZ31镁合金板料数控热渐进成形时的摩擦和润滑机理。结果表明:镁合金薄板在加热条件下可以实现单点渐进成形;固体润滑膜可分为粘结型和吸附陶瓷型两种;固体石墨和MoS2润滑剂的初始摩擦因数均小于0.12,均可保证热渐进成形件获得良好的内外表面质量,没有任何划痕和裂纹等缺陷;吸附多孔陶瓷型固体润滑膜具有润滑和自润滑作用,固体润滑剂颗粒大小对初始摩擦因数有一定影响;固体BN粉末没有起到润滑作用,不能单独作为热渐进成形用固体润滑剂;当温度小于500℃时,固体石墨和MoS2粉末按一定比例配置的润滑复合喷剂的初始摩擦因数均小于为0.2,且表现出一定的协同作用。     

微织构自润滑表面在油介质中的摩擦学性能

为探究不同表面处理方式对试样表面摩擦学性能的影响,分别对GCr15试样表面进行激光微织构加工,光滑表面涂抹润滑油,微织构表面填充固体润滑剂,微织构表面涂抹润滑油,微织构表面填充固体润滑剂并涂抹润滑油等不同表面处理方式,在MMW-1A摩擦磨损机上进行摩擦磨损试验。同时改变试验的载荷及转速,探究在不同转速和载荷工况下,不同表面处理方式对试样摩擦因数的影响。结果表明,在干摩擦条件下,试样表面采用微织构处理并填涂固体润滑剂可使摩擦因数较光滑表面降低47.6%;在油介质中,采用微织构处理可使摩擦因数较光滑表面降低4.8%,采用微织构处理并填充固体润滑剂可使摩擦因数较光滑表面降低17.7%。且在油介质中,采用织构化处理和固体润滑结合的表面处理方法,试样摩擦因数随载荷增大而减少且逐渐趋于稳定,但随转速增大而增大。     

机载导弹发射装置粘着磨损分析

本文介绍了两个型号的机载导弹发射装置运动机构摩擦副发生失效的现象。对A型发射装置，进行了大量的验证试验，并对锁制机构进行了理论计算和摩擦副表面扫描电镜观察；对B型发射装置的运动副表面形貌进行了分析，结果表明二者摩擦副均发生了粘着磨损。依据粘着磨损发生的机理，结合实际工况，分析了锁制机构和B型发射装置相关摩擦运动副发生粘着磨损的影响因素。并采取有效措施更换摩擦副对偶材料，在摩擦副表面喷涂固体润滑剂等方法进行了改进。大量的试验验证表明改进措施正确、有效，为今后发射装置摩擦副避免粘着磨损提供了设计和工程应用依据。     

9Cr18和GCr15球-盘摩擦副摩擦学性能分析

利用球－盘摩擦试验机，在大气和真空环境中分别考察了9Cr18和GCr15钢在干摩擦和固体润滑条件下与钢球的摩擦损性能，试验结果表明：两种材料在真空环境中或MoS2基薄膜润滑条件下，摩擦系数都明显低于大气环境或无润滑条件，而且摩擦振动和噪音较低，磨痕表面较光滑，通常的摩擦副在真空环境中的摩擦系数，磨损量比大气中大。研究表明这是由于9Cr18盘表面干摩擦跃迁导致了加工硬化和MoS2基薄膜润滑作用，通过对动态动摩擦系数及其特征值的系统分析，对这两种材料的摩擦过程特性进行了研究。     

锻造加工中的固体润滑

锻造加工中的固体润滑２１３００１常州牵引电机厂石淼森金属锻造加工过程中的摩擦磨损和润滑问题是决定其工艺成败的关键因素之一。在锻造时，锻模与锻坯摩擦面上的接触压力极高，高压接触面积很大，同时还承受很高的冲击载荷和较强的振动。并且，随着金属的塑性变形，还...     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

RHEOLOGY FEATURE OF SIMPLE METAL MELT

The rheology feature of Sb, Bi melt and alloys was studied using coaxial cylinder high-temperature viscometer. The results showed that the curve of torsion-rotational speed for Sb melt presents a linear relation in all measured temperature ranges, whereas for the Bi melt, the curve presents obvious non-Newtonian feature within the low temperature range and at relative high shear stress. The rheology feature of Sb80Bi20 and Sb20Bi80 alloy melts was well correlated with that of Sb and Bi, respectively. It is considered that the rheology behavior of Sb melt plays a crucial role in Sb80Bi20 alloy and that of Bi melt plays a crucial role in Sb20Bi80 alloy.     

FORMULAS OF TENSION OF CONTINUOUS ROLLING PROCESS

The development of computer controlled continuous rolling process calls for a mathematical expression that can express the inequality condition of "constant flow". Tension is the link of the continuous rolling process. From the condition of dynamic equilibrium, a differential equation of tension is given out. On the basis of the physical rules established from the industrial practice and experimental studies, the law of volume constancy, the linear relation of forward slip and tension, the state equation of continuous rolling, the formula of dynamic tension, and the formula of static tension have been obtained. These formulae reflect the functional relations between tensions, thickness, roll velocity, and time in the continuous rolling process. It is implied that the continuous rolling process is a gradually steady, controllable, and measurable dynamic system. An assumption of predicting the thickness of a steel plate using these tension formulae is also put forward.