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INFLUENCE OF HEAT TREATMENT ON DAMPING BEHAVIOUR OF THE MAGNESIUM WROUGHT ALLOY AZ61

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Acta metallurgica Sinica(English Letters) 2007年第4期20卷 235-240页

作者： R. González-Martínez J. Gken D. Letzig J. Timmerberg K. Steinhoff K.U. Kainer Institute for Materials Research GKSS Research Center21502 GeesthachtGermany Institute of Maritime Studies University of Applied Sciences26789 LeerGermany chair of metal forming technology University of Kassel34125 KasselGermany

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.

关键词： magnesium AZ61 damping precipitation

Thermo-Mechanical Influence on the Internal Friction of a 51CrV4 Shaft

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Chinese Physics Letters 2012年第11期29卷 131-135页

作者： J.Göken I.S.Golovin T.S.Andrianova K.Steinhoff H.Brink Faculty of Maritime Studies University of Applied Sciences Emden-LeerBergmannstrasse 3626789 LeerGermany Department of Physical metallurgy of Non-Ferrous metals National Research Technological University'MISIS'119049MoscowLeninskiy Prospekt 4Russia chair of metal forming technology University of KasselKurt-Wolters-Str.334125 KasselGermany

The influence of simultaneously applied mechanical and thermal treatment is used for producing a geometrically complex shaft from 51CrV4 steel resulting in widely differing formations of ***'properties such as internal friction(IF),hardness and electrical resistivity are affected by this change of microstructure *** Snoek–Koster peak is identified and analyzed in the actual steel structure.

关键词： 51CrV4 structure steel

Stainless Steel Composite Integrated in Modern Facade Engineering

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Journal of Mechanics Engineering and Automation 2015年第8期5卷 427-434页

作者： Marc Tulke Jennifer Watzke Michael Schomacker Alexander Brosius Janine Bach Helmut Hachul TU Dresden Institute of Manufacturing Technology Chair of Forming and Machining Processes Dresden 01062 Germany university of Applied Science and Arts Dortmund Architecture and Metal Construction Dortmund 44227 Germany

This paper shows the results of characterising a stainless steel composite material for applications in facade engineering. A number of possible shapes generated with pneumatic stretch forming are presented as a result of simulation studies. In this context a model of a possible facade combined from different shapes is created to show the optical effect of the simulated shapes. Additionally, the manufacturing of a device for pneumatic stretch forming is discussed and first results of transforming the stainless steel composite material with pneumatic stretch forming are shown.

关键词： Composite design facades lightweight pneumatic forming

应用波束形成法研究51CrV4梯度功能钢的微观结构

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冶金分析 2009年第4期29卷 7-13页

作者： J. Goken M. Maikranz-Valentin J. Timmerberg S. Luker D. Fuβ J. Feierabend K. Steinhoff . Institute of Maritime Studies University of Applied Sciences Bergmannstr. 36 26789 Leer Germany chair of metal forming technology University of Kassel Kurt-Wolters-Str. 3 34125 Kassel Germany Department of Electrical Engineering University of Applied Sciences Friedrich Paffrath-Str. 101 26389Wilhelmshaven Germany Agency of Computer-Generated Imagery Brahmsweg 2 49681 Garrel Germany Gfai Tech GmbH Rudower Chaussee 30 12489 Berlin Germany

对组分梯度功能范围的调整要求已提出,通常通过不同材料组合得以解决。但是这种生产方式一方面需要一系列的工序,另一方面也需要具体的知识,包括所用材料的独特物理及机械特性,尤其是它们的形变及热行为。因此,为了降低能耗,考虑到生态... 详细信息

对组分梯度功能范围的调整要求已提出,通常通过不同材料组合得以解决。但是这种生产方式一方面需要一系列的工序,另一方面也需要具体的知识,包括所用材料的独特物理及机械特性,尤其是它们的形变及热行为。因此,为了降低能耗,考虑到生态需求,一个组分的现代工业设计程序只应包括一种操作程序和一种具有优化性能的范围大的材料。同时对同质的工件初样进行热处理及机械处理保证了控制材料能够具有最终元件性能的梯度功能。第一步,研究不同热处理对CrV-合金热处理矩形条钢(51CrV4)微观结构演化的影响。生产出只具有铁素体-珠光体、铁素体-珠光体-贝氏体和马氏体结构的条钢。与振动的振幅衰减相关的时间由声学照相机测定。这种声学照相机可以产生彩码声音图谱,显示覆盖于已记录样品图像上噪音的强度和来源。基于作为常规信号处理方法的波束形成概念,该声音分析用来控制换能器阵列上信号的接收或传播方向。条钢的独特微观结构状况造成了振动特性的显著变化。

关键词：钢梯度功能内耗波束形成法

Prediction and Experimental Validation of forming Limit Curve of a Quenched and Partitioned Steel

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Journal of Iron and Steel Research International 2016年第6期23卷 580-585页

作者： Xue-li GAO Jun-ying MIN Ling ZHANG Quan-chao LI Chang-wei LIAN Jian-ping LIN School of Mechanical Engineering Tongji University Shanghai 201804 China chair of Production Systems Ruhr-University Bochum Bochum 44801 Germany State Key Laboratory of Development and Application technology of Automotive Steels (Baosteel) Shanghai 201900 China

forming limit curve（FLC）is an effective tool to evaluate the formability of sheet *** accurate FLC prediction for a sheet metal is beneficial to its engineering application.A quenched and partitioned steel,known as QP980,is one of the 3rd generation advanced high strength steels and is composed of martensite,ferrite and a considerable amount of retained austenite（RA）.Martensite transformation from RA induced by deformation,namely,transformation induced plasticity（TRIP）,promotes the capability of work hardening and consequently *** tests were carried out to obtain the experimental forming limit strains with the aid of digital image correlation *** electron microscopy（SEM）was employed to examine the fracture morphologies of Nakazima specimens of the QP980 *** observed dimple pattern indicated that tensile stress was the predominant factor which led to failure of QP980 ***,maximum tensile stress criterion（MTSC）was adopted as the forming limit *** predict the FLC of QP980 steel,Von-Mises yield criterion and power hardening law were adopted according to the tested mechanical properties of QP980 *** were compared with those derived from other three representative instability theories,*** criterion,Storen-Rice vertex theory and Bressan-Williams model,which shows that the MTSC based FLC is in better agreement with the experimental results.

关键词： criterion tensile martensite hardening plasticity TRIP austenite steels ferrite quenched

Enones from aldehydes and alkenes by carbene-catalyzed dehydrogenative couplings

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Chinese Chemical Letters 2024年第9期35卷 150-154页

作者： Kun Tang Fen Su Shijie Pan Fengfei Lu Zhongfu Luo Fengrui Che Xingxing Wu Yonggui Robin Chi National Key Laboratory of Green Pesticide Key Laboratory of Green Pesticide and Agricultural BioengineeringMinistry of EducationGuizhou UniversityHuaxi DistrictGuiyang 550025China School of chemistry Chemical Engineeringand BiotechnologyNanyang Technological UniversitySingapore 637371Singapore

Enones are widely explored in synthetic chemistry as fundamental building blocks for a wide range of reactions and exhibit intriguing biological activities that are pivotal for drug *** development of synthetic strategies for highly efficient preparation of enones thereby receives intense attention,in particular through the transition metal-catalyzed coupling ***,we describe a carbene-catalyzed cross dehydrogenative coupling(CDC)reaction that enables effective assembly of simple aldehydes and alkenes to afford a diverse set of enone ***,the in situ generated aryl radical is pivotal to“activate”the alkene by forming an allyl radical through intermolecular hydrogen atom transfer(HAT)pathway and thus forging the carbon-carbon bond formation with aldehyde as the acyl ***,our method represents the first example on the enone synthesis through coupling of“non-functionalized”aldehydes and alkenes as coupling partners,and offers a distinct organocatalytic pathway to the transition metal-catalyzed coupling transformations.

关键词： Enones Cross dehydrogenative coupling N-Heterocyclic carbene Aryl radical Hydrogen atom transfer