轧辊局部爆裂的分析

轧辊失效的形态有多种，如热处理硬度偏高和组织不良所引起的裂纹、崩裂等。轧辊硬度和金相组织均正常，但因含Ｃａ、Ｓｉ夹杂物而形成裂纹源，在使用过程中裂纹逐渐扩大，也会产生局部爆裂。分析了因Ｃａ、Ｓｉ夹杂物而导致的轧辊爆裂现象。     

锅炉过热器管爆管失效分析

调查了规格为Ф32mm×4mm过热器管发生爆裂的事故,通过力学性能分析、化学成分检测、金相分析及扫描电镜分析等方法对炉管爆裂原因进行了分析。最终发现失效的原因为炉管的钢材使用错误,使得炉管强度不足,最终导致炉管的爆裂。     

1000t水压机高压水管爆裂分析

通过对爆裂高压水管的化学成分、应力分析、金相观察和断口扫描电镜及能谱分析，结果表明，高压水管爆裂主要与弯管工艺欠佳有关，材料中的条状MnS夹杂促进了早期爆裂的进程。     

热采锅炉炉管爆裂的金相变化分析

以某种规格锅炉炉管为研究对象，在炉管爆裂处的母材、撕裂碎块以及供货原材料的纵横两个方向分别取样进行分析，探讨锅炉管爆裂处的金相变化对炉管失效的影响，并给出锅炉炉管爆裂破坏的金相学原因。     

2000T螺杆式压力机单向阀爆裂原因分析

针对某厂2000t螺杆式压力机单向阀在使用中发生爆裂酿成安全事故,从金相、断口、力学性能和安全性等方面对此进行了检验.结合上述检验结果对阀盖爆裂现象进行了详细的分析和讨论.爆裂的单向阀阀盖存在较严重的铸造疏松缺陷,力学性能较差也没有达到设计材质HT300的要求.综合分析认为,最终导致阀盖短期服役即发生爆裂的主要原因是较严重的铸造缺陷.     

地质勘探管爆裂分析

采用化学分析和金相检验等方法，对地质勘探管爆裂原因进行了分析，结果表明：硫偏析以及低熔点硫化物是造成其爆裂的主要原因。     

铁磁性金属构件自磁化荧光磁粉检测

五金冲压模具在使用时承受重复性高应力，容易产生疲劳裂纹。如不进行及时检验，将发生模具爆裂事故，造成人身伤害和财产损失。笔者研究了一种可以在不拆卸模具的情况下，方便快捷地检测冲压模具疲劳裂纹的方法。     

锅炉对流管爆裂原因分析

采用化学分析、金相检验及力学性能测定等方法，对锅炉对流管爆裂原因进行了分析。结果表明，长期超温运行而引起的蠕变是导致爆裂的主要原因。     

3500轧机采用VCL技术改善轧制状态

上海浦钢公司厚板厂的3500四辊精轧机采用VCL技术，有效地改善了钢板权形及减小了横向同板差，同时消除了使用平辊轧制时支承辊两端爆裂及工作辊两端表面剥落掉皮等问题，取得显著的经济效益。     

裂解炉对流段炉管爆裂分析

针对辽阳石化分公司烯烃厂F108裂解炉对流段炉管爆裂破坏进行了分析.结果表明，爆裂原因是由于炉管在高温下长期运行，管壁氧化腐蚀减薄并影响传热，同时管壁金相组织发生变化，使得炉管强度降低所致.     

T.I.M.E.焊工艺特点及其发展现状

Ｔ．Ｉ．Ｍ．Ｅ焊工艺是一种新型的高效,高熔敷率的气体保护焊工艺,本文介绍了它的主要特点及优越性,从药芯焊丝和实心焊丝两方面对Ｔ．Ｉ．Ｍ．Ｅ焊接工艺在欧洲的发展作了简要介绍,分析了Ｔ．Ｉ．Ｍ．Ｅ焊工艺的工作机理。     

Corrosion pyrophoric deposits as promoters of self-ignition of storage tanks with sour crude oil

The causes of the formation and the conditions for self-ignition of pyrophoric deposits in the vapor zone of tanks during the storage of sour crude oil were considered. It was demonstrated that creation of an oxygen-free atmosphere inside oil storage tanks seems to be the most promising approach to prevention of self-ignition and corrosion. This approach was effected in practice by supplying oil tanks with nitrogen from a membrane gas separator. Original Russian Text ? Yu.A. Beilin, L.A. Nisel’son, I.R. Begishev, L.I. Filimonov, B.A. Shishkanov, I.I. Ashcheulova, A.N. Podobaev, I.I. Reformatskaya, 2007, published in Zashchita Metallov, 2007, Vol. 43, No. 3, pp. 290–295.     

Industrial texture control in the production of ribbons from nonferrous metals

Processes that occur in manufacturing metallic products are accompanied by the formation and change of predominant crystallographic orientations of grams or textures. In the present work the principles and some practical techniques of control over metallic products based on measuring the texture parameters are formulated. This has been used to develop continuous nondestructive control of the properties of alloys in technological lines. On-line texture control of technological processes is described as applied to continuous annealing of copper, brass, and aluminum ribbons used at plants for processing nonferrous metals.Translated from Metallo!ovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 32–35, May, 1995.In experimental part of the work was done in collaboration with A. I. Kekalo, O. A. Avdyushkin, L. Yu. Luzhbina, M. z. Pevzner, N. S. Yanburenko, N. Yu. Pappe, K. I. Shckekin, Yu. S. Grigor'ev, and A. A. Evgrafov,     

The properties and uses of fluxes in molten aluminum processing

Gaseous and solid fluxes play an important role in the degassing, demagging, and fluxing of aluminum and its alloys. Inert as well as reactive gases, or hexachloroethane, may be used to remove dissolved hydrogen and sodium. Magnesium may be removed by chlorine or an aluminum-fluoride-containing flux. Fluxes based on a KCl-NaCl mixture may be used to cover and protect the metal from oxidation. To recover aluminum from drosses, a more reactive flux containing cryolite or some other fluoride may be used. In this article, the thermodynamics of aluminum melting and refining are analyzed in terms of the behavior of sodium, magnesium, and calcium. The coalescence of aluminum drops in salt fluxes improves with fluoride additions. With increasing MgCl₂ contents in the flux, the effects of NaF and KF additions become much less pronounced. T.A. Utigard earned his Ph.D. in metallurgy at the University of Toronto, Canada, in 1985. He is currently an associate professor at the University of Toronto. Dr. Utigard is a member of TMS. K. Friesen earned her M.A.Sc. in metallurgy and materials science at the University of Toronto in 1997. She is currently a plant metallurgist at Scepter. R.R. Roy earned his Ph.D. in materials science and engineering at Ohio State University in 1994. He is currently a research associate at the University of Toronto. J. Lim earned his M.A.Sc. in metallurgy and materials science at the University of Toronto in 1997. He is currently a Ph.D. candidate at McMaster University. A. Silny earned his Ph.D. in chemistry at the Slovak Academy of Sciences in 1998. C. Dupuis earned his M.Sc. in metallurgical engineering at Laval University in 1997. He is currently a senior scientist at Arvida Laboratories, Alcan International Ltd. Mr. Dupuis is also a member of TMS.     

Simulating convection and macrosegregation in superalloys

Numerical simulations using a mathematical model of the dendritic solidification of multicomponent alloys that includes thermosolutal convection and macrosegregation were conducted on nickel-based alloys. The results show that segregation patterns vary greatly with cooling conditions, adopting several shapes and levels of intensity. In addition, the segregation patterns are particularly sensitive to the values of the equilibrium partition coefficients of the alloy components. S.D. Felicelli earned his Ph.D. in mechanical engineering from the University of Arizona in 1991. He is currently a research scientist at Centro Atomico Bariloche, Argentine Atomic Energy Commission. D.R. Poirier earned his Sc.D. in metallurgy from the Massachusetts Institute of Technology in 1966. He is currently professor of materials science and engineering at the University of Arizona. Dr. Poirier is a member of TMS. A.F. Giamei earned his Ph.D. from Northwestern University in 1967. He is currently principal scientist in the Materials and Structures Technology Department of the United Technologies Research Center. Dr. Giamei is also a member of TMS. J.C. Heinrich earned his Ph.D. in mathematics fromthe University of Pittsburgh in 1975. He is currently professor of aerospace and mechanical engineering at the University of Arizona.     

高速精密压力机下死点精度研究

下死点精度为高速精密压力机的重要技术指标,直接影响着冲制品精度以及模具使用寿命。影响下死点精度的因素主要有:转速变化、温度变化、机床刚性、静平衡气压等,通过构建测试系统或使用下死点检测仪进行了下死点测试、下死点影响因素的定量分析,并简要介绍了高速精密压力机下死点控制措施:下死点动态调整、控制速度位移、控制温度位移以及简化传动系统。     

Metal forming at the center of excellence for the synthesis and processing of advanced materials

The U.S. Department of Energy’s Office of Basic Energy Sciences recently established the Center for Excellence in the Synthesis and Processing of Advanced Materials. Projects at the center typically include several national laboratories, industrial partners, and universities; metal forming is one of eight projects within the center. This article describes the center’s metal forming project, which emphasizes aluminum alloy forming, particularly as applicable to the automotive industry. D.A. Hughes earned her Ph.D. in materials science at Stanford University in 1986. She is a principal member of the technical staff at Sandia National Laboratories. M.E. Kassner earned his Ph.D. in materials science at Stanford University in 1981. He is Northwest Aluminum Professor at Oregon State University. M.G. Stout earned his Ph.D. in materials science at the University of Minnesota in 1976. He is a staff member at Los Alamos National Laboratory. J. Vetrano earned his Ph.D. in metallurgy at the University of Illinois in 1990. He is a senior research scientist at Pacific Northwest National Laboratory. Editor’s Note: A hypertext-enhanced version of this article can be found on the TMS web site at www.tms.org/pubs/joumals/JOM/9806/Hughes-9806.html.     

Determining the integral dissolution rate of two-phase alloys in cryolite-alumina melts

Electron microscopy and x-ray diffraction analysis are used in studying Cu-Fe and Ni-Fe-Al alloys upon their anodic polarization in a cryolite-alumina melt, thus, clarifying the regularities of their dissolution and the formation of oxide coatings. Based on the results obtained, a technique of determining the integral corrosion rate of the alloys is proposed. Original Russian Text ? A.Yu. Filatov, E.V. Antipov, M.I. Borzenko, S.Yu. Vasil’ev, V.M. Denisov, V.V. Ivanov, S.M. Kazakov, Z.V. Kuz’minova, V.K. Laurinavichyute, V.V. Lunin, D.A. Simakov, V.I. Shtanov, 2008, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2008, Vol. 44, No. 6, pp. 664–668.     

The effect of hot isostatic pressing on cast aluminum

Aluminum-silicon alloys are the most important commercial aluminum casting alloys, primarily because of their superior casting characteristics. This article discusses the effect of hot isostatic pressing on the mechanical properties of cast aluminum alloy A356. The effect of low-cost Densal hotisostatic pressing is also examined. C.S.C. Lei earned his Ph.D. in mechanical engineering/solid mechanics at Drexel University in 1987. He is currently a visiting scientist at the Naval Air Warfare Center, Aircraft Division. W.E. Frazier earned his Ph.D. in materials engineering at Drexel University in 1987. He is currently the head of metal, ceramics, and nondestructive evaluation at Naval Air Warfare Center, Aircraft Division. Dr. Frazier is also a member of TMS. E.W. Lee earned his Ph.D. in materials engineering at the Georgia Institute of Technology in 1982. He is currently propulsion materials team leader at Naval Air Warfare Center, Aircraft Division.     

Mathematical model and algorithm for computing the electric field of pipeline cathodic protection with extended anodes

A mathematical model and a numerical method for computing the electric fields of the pipeline cathodic protection with extended anodes in a three-dimensional semirestricted domain. The developed algorithm and program allow one to assess the effect of geometrical parameters on the effectiveness of the cathodic protection of main pipelines. Original Russian Text ? A.M. Bolotnov, N.N. Glazov, N.P. Glazov, K.L. Shamshetdinov, V.D. Kiselev, 2008, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2008, Vol. 44, No. 4, pp. 438–441.