蓬莱大柳行金矿区水沟——时金河断裂构造特征及其找矿意义

以构造地质及构造地球化学等研究为依据，重新厘定了水沟－时金河断裂的规模，弄清了它的引张－压扭－张扭的构造性质，探讨了断裂形成时代、演化历史及其对岩浆作用和成矿作用的控制规律。认为该断裂具有导容矿双重性。导矿作用发生在断裂的开放构造环境及相关部位，并在其两侧形成石英脉金矿床。容矿作用发生在断裂的封闭构造环境及相关部位，在断裂内形成蚀变岩型金矿床。实现了找矿勘探方向由派生断裂向主干断裂的战略转移，为扩     

G12—35冲动凝气式汽轮机叶片断裂分析

通过金相显微镜对断裂叶片进行了失效分析，结果表明，加工不良造成局部应力过高；晶粒粗大和回火不充分是导致叶片断裂的主要原因。     

风机轮叶片失效分析

用扫描电子显微镜和Ｘ射线能谱仪对风机轮叶片断口进行了综合分析，探明风机轮叶片断裂原因是由于空气中的ＳＯ２气体长期对叶片表面的腐蚀作用，开裂自晶界应力腐蚀裂纹起始，以疲劳开裂方式扩展，导致最终断裂。     

烧结厂2号鼓风机爆炸事故分析

对烧结厂２号鼓风机因其叶片断裂造成的整机爆炸事故进行了原因分析。通过对叶片断口外貌，裂纹起始位置和焊缝进行金相检验，认为叶片断裂是由制造过程中存在的焊接缺陷而产生的应力集中所造成的。     

进口烟机用国产GH738合金动叶片断裂事故分析

无顺石油厂二厂在进口烟气轮机上配置国产ＧＨ７３８合金二级动叶片运行尚属首次，该烟气轮机机组运行４０余天后，发生二级叶片断裂事故。在分解检查与事故分析过程中将国产ＧＨ７３８合金二级叶片同进口Ｗａｓｐａｌｌｏｙ合金一级动叶片进行了对比。采用金相，电镜进行组织特征分析，对分析结果综合判断，认为国产ＧＨ７３８合金叶片断裂主要原因不是材质问题，与叶身设计，催化剂浓度过高，局部冲刷严重有关，试验中发现国产叶片     

多喷管二段式新型引射器数值模拟

为了进一步解决铁钢包烘烤器在烘烤过程中烟气抽吸问题,提出了多喷管二段式扩压引射器结构,并利用Fluent软件对新型引射器进行数值模拟,分析不同喷管数量以及二段式扩压结构对烟气引射效果的影响。结果表明,随着喷管数量的增加,接受室内工作流体产生的低压区更为明显;喷管数量的增加使得混合室内工作流体与烟气混合更为均匀,流速分布范围减小;二段式扩压结构消除了单级扩压室出口的速度死区或回流区,扩压效果更加明显。引射器整体引射效果得到极大改善,四喷管二段式扩压结构的引射器在工作流体相对压力为0.3 MPa、烟气相对压力为200 Pa的情况下,引射系数高达1.42。     

125 MW机组低压转子末级叶片围带断裂分析及改造

介绍了某电热公司125MW机组投产以来低压转子末级叶片围带断裂的情况,分析了低压转子末级叶片围带断裂的原因及解决方案,利用机组检修机会将低压转子末级叶片改造为自带冠结构型式,彻底解决了末级叶片围带断裂的问题,提高了机组运行的安全性及经济性。     

动叶片断裂失效分析

对断裂动叶片进行了试验研究,分析了1.2-50/5抽气1.2万kW汽轮机组十级动叶片断裂失效原因.     

用于钢包烘烤的引射器扩压室优化研究

通过建立三维引射器模型,采用Fluent模拟软件对引射器进行数值模拟研究,分析引射器扩压室结构对引射器性能的影响。研究结果表明:当引射器扩压室长度为0.19m、扩张角度为8°时,引射性能最佳,引射系数为1.62;当引射器扩压室的长度保持不变时,一定范围内引射性能随扩张角度的增大呈下降趋势;当扩压室扩张角度保持不变时,一定范围内随着扩压室长度的减小,引射性能逐渐增强。     

天铁7~#风机动叶片断裂原因分析与改进

对天铁7#风机动叶片的断裂,分析出其断裂根本原因为动叶片的安装质量不佳,转子高速运转时离心力把动叶片甩出。通过调整动叶片与隔叶块之间的接触面积、优化动叶片装配效果鉴定措施等方法,保障了动叶片的正常工作,确保了机组的运行安全。     

The Growth of Hematite Blades during the High Temperature Oxidation of Iron

Micron-size blades of hematite (α-Fe2O₃) are observed to grow out of the oxidized surface of iron at high temperatures. The characteristics of these blades are described in the literature. The blades are observed to be twinned such that the plane of the blade is parallel to the (01−11) twin plane (K ₁), the blade axis is [−2110], and the direction of shear (η₁) is [0−112]. In addition, there is a hollow tunnel up the axis of each blade. It is suggested that the blades grow by surface diffusion of iron cations from the underlying magnetite through the tunnels to the blade tips; some lateral growth occurs by diffusion of these cations in the twin planes. The tunnels eventually become blocked in mature blades, forming a string of elongated voids, and further growth ceases.     

Analysis of the causes of fracture of turbine blades in a gas-compressor unit

The problems of the fatigue life of gas-compressor unit blades are discussed. In particular, the results of fractographic investigation are used to formulate the specific features of fracture of stamped lowpressure turbine blades made of an EI893 alloy, which exhibit the maximum number of damages in a five-year period. In 80% cases, fracture begins with the formation of a brittle zone in the leading edge of a blade airfoil because of the resonance phenomena caused by a break in the stiffness of the blade–turbine disk joint. This conclusion is supported by pronounced traces of fretting corrosion in the contact surfaces of the joint of a failed blade and a disk.     

TRT透平机叶片断裂分析

对某厂2号TRT透平机一级动叶片中断裂叶片的化学成分、宏观断口以及金相组织进行了分析,结果表明,该叶片属于腐蚀疲劳断裂,其疲劳裂纹起源于叶片进气边边缘部位的腐蚀麻点处,腐蚀麻点是由于叶片与湿积灰中的腐蚀性介质Cl-,SO4-等发生反应造成的。     

Fracture mechanism of a thermal barrier coating

The fracture mechanism of the thermal barrier coating of gas turbine blades is studied. The causes of the fracture of the ceramic layer are discussed and the possible ways to increase the fatigue life of the thermal barrier coating are considered.     

铜基预合金粉末制备金刚石锯片的性能研究

采用共沉淀法制备了不同铜铁配比（质量比:45:35、50:30、55:25）的铜基预合金粉末,利用真空热压法烧结得到含金刚石的铜基结合剂刀头,通过激光焊接的方法制备出铜基结合剂金刚石锯片,研究了铜基预合金粉末中铜铁含量（质量分数）对金刚石锯片性能的影响。利用扫描电子显微镜观察锯片断面的显微组织形貌,并测量不同铜铁含量锯片的硬度和磨损量。结果表明:在三种配比中,当铜和铁质量比为50:30时,铜基结合剂与金刚石间的结合最佳,锯片性能最好,硬度最高（HRB 118）,锯片的磨损量最少（1.16 g）。     

Jumplike fatigue crack growth in compressor blades

It is shown that power relations between the two main fractographic characteristics of fracture surfaces forming during jumplike fatigue crack growth, namely, the crack depth and the corresponding crack front length, can be used to estimate the fracture stress during vibration tests of the compressor blades of an aviation gas turbine engine, which are made of VT3-1 titanium alloy.     

Effect of Vacuum Carburizing on the Structure and the Properties of Aluminide Coatings on Nickel Superalloys

The processes that occur during vacuum carburizing of turbine blades made of carbon-free nickel superalloys are considered. Disperse alloying-element carbide particles are found to form in the surface layer of the VZhM5 alloy. These particles increase the fatigue life of the alloy during high-temperature oxidation. The disperse carbide particles are shown to hinder the formation of coarse γ′-Ni₃Al grains and topologically close-packed phases under a coating; hence, they prevent premature fracture of the alloy.     

Diffusion aluminide coatings for internal surface of rhenium- and rhenium-ruthenium-containing single-crystal superalloys turbine blades: Part I

Process of formation rhenium or refractory carbides based diffusion barrier layer (coating) on internal surface of rhenium- and rhenium-ruthenium-containing single-crystal high-temperature alloys (superalloy) turbine blades, prior to diffusion aluminide coating deposition, is studied. It is shown that diffusion barrier layer is preventing deleterious secondary reaction zone formation under aluminide coating during long-term high-temperature operation. The kinetics of powder carburizing process of rhenium- and rhenium-ruthenium-containing high-temperature alloys is investigated, and conditions for carburizing these alloys are determined. The phase composition of the surface layer after carburizing is studied, and the effect of the fractional composition of a carbon-based powder mixture on the carburizing rate is determined.     

Diffusion aluminide coatings for protecting the surface of the internal space of single-crystal turbine blades made of rhenium- and rhenium-ruthenium-containing high-temperature alloys: Part II

The production of heat-resistant aluminide and chromium aluminide protective coatings with a barrier layer, which is based on the carbides of the refractory elements of a nickel superalloy, is considered for the powder methods of diffusion chromium and aluminum saturation of the surface of the internal space of single-crystal high-pressure turbine blades made of high-temperature rhenium- and rhenium-ruthenium-containing alloys for a gas turbine engine. The barrier layer is shown to prevent the formation of a secondary reaction zone, which softens an alloy, under a heat-resistant coating during long-term high-temperature holding. The kinetics of powder-assisted aluminizing and chromizing-aluminizing of high-temperature rhenium- and rhenium-ruthenium-containing alloys is studied, aluminizing and chromizing-aluminizing conditions are determined, and the effect of heat-resistant diffusion coatings with a barrier layer on the mechanical properties of the high-temperature alloys is investigated.     

Effect of hot isostatic pressing on the structure and properties of cast polycrystalline gas-turbine blades made of nickel superalloys

A concept of a two-stage hot isostatic pressing (HIP) cycle is developed for castings made of nickel superalloys in order to minimize plastic deformation and the recrystallization ability of their structure. At the first stage of the cycle, diffusion pore dissolution is predominant due to the motion of vacancies toward grain boundaries in a polycrystal; at the second stage, retained coarse pores are filled during plastic deformation. The effect of uniform compression pressure during HIP and microstructure defects on the vacancy diffusion in nickel superalloys is estimated. A two-stage HIP regime is developed for processing of cast gas-turbine engine blades made of a ZhS6U alloy in order to substantially decrease the shrinkage porosity and to increase the high-temperature characteristics, including the creep and fatigue resistance.