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Tensile and spring-Back Behavior of DP600 Advanced High strength steel at Warm Temperatures

Journal of Iron and steel Research International 2009年第6期16卷 41-46页

作者： F Ozturk s toros s Kilic Department of Mechanical Engineering Nigde University

In recent years, the use of advanced high strength steels in automotive industry has been increased remarkably. Among advanced high strength steels, dual phase （DP） steels have gained a great attention owing to a combination of high strength and good formability. However, high strength usually increases the spring-back behavior of the material, which creates problems for the parts during the assembly. Thus, the uniaxial tensile deformation and spring-back behaviors of DP600 advanced high strength steel were investigated in rolling （0°）, diagonal （45°） , and transverse （90°） directions in the temperature range from room temperature （RT） to 300 ℃. All tests were performed at a deformation speed of 25 mm/min. A V-shaped die （60°） was used for the spring-back measurements. The results indicated that the formability and spring-back of the material were decreased with increasing the temperatures. The material showed complex behaviors in different directions and at different temperatures.

关键词： advanced high strength steel DP600 warm forming spring-back

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strain Hardening and strain Rate sensitivity Behaviors of Advanced High strength steels

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Journal of Iron and steel Research International 2013年第6期20卷 68-74页

作者： F Ozturk A Polat s toros R C Picu Department of Mechanical Engineering Nigde University Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic InstituteTroy 12180 New York USA

The mechanical properties of commercial dual phase （DP）, transformation induced plasticity （TRIP）, and high strength low alloy （HsLA-340） steel sheets are investigated and compared at various strain rates ranging from 0.001 7to 0.17 s-1 at ambient *** steel outperforms the other two materials , having comparable ductility and twice as large strength relative to DP *** has larger strength and much larger ductility than *** exceuent ductility of TRIP800is due to its high strain hardening capability , which promotes stable plastic *** is observed that the strain hardening rate in TRIP800does not decrease to zero at failure , as common in most materials in which failure is preceded by necking.

关键词： steel advanced high strength steel HsLA DP TRIP hardening

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Precision micro-mechanical components in single crystal diamond by deep reactive ion etching

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Microsystems & Nanoengineering 2018年第1期4卷 278-285页

作者： Adrien toros Marcell Kiss Teodoro Graziosi Hamed sattari Pascal Gallo Niels Quack EPFL sTI IMT GR-QUACK Station 11CH-1015 LausanneSwitzerland LakeDiamond sA Rue Galilée 7CH-1400 Yverdon-les-BainsSwitzerland

The outstanding material properties of single crystal diamond have been at the origin of the long-standing interest in its exploitation for engineering of high-performance micro-and *** particular,the extreme mechanical hardness,the highest elastic modulus of any bulk material,low density,and the promise for low friction have spurred interest most notably for micro-mechanical and MEMs *** reactive ion etching of diamond has been reported previously,precision structuring of freestanding micro-mechanical components in single crystal diamond by deep reactive ion etching has hitherto remained elusive,related to limitations in the etch processes,such as the need of thick hard masks,micromasking effects,and limited etch *** this work,we report on an optimized reactive ion etching process of single crystal diamond overcoming several of these shortcomings at the same time,and present a robust and reliable method to produce fully released micro-mechanical components in single crystal *** an optimized Al/siO_(2) hard mask and a high-intensity oxygen plasma etch process,we obtain etch rates exceeding 30μm/h and hard mask selectivity better than 1:*** demonstrate fully freestanding micro-mechanical components for mechanical watches made of pure single crystal *** components with a thickness of 150μm are defined by lithography and deep reactive ion etching,and exhibit sidewall angles of 82°–93°with surface roughness better than 200 nm rms,demonstrating the potential of this powerful technique for precision microstructuring of single crystal diamond.

关键词： exceeding diamond shortcomings

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Crystal and electronic structure study of Mn doped wurtzite ZnO nanoparticles

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Progress in Natural science:Materials International 2016年第4期26卷 347-353页

作者： O.M.Ozkendir s.Yildirimcan A.Yuzer K.Ocakoglu Department of Energy systems Engineering Mersin University Tarsus Faculty of Technology Advanced Technology Research & Application Center Mersin University Faculty of Engineering Department of Electrical-Electronics Engineering Toros University

The change in the crystal and electronic structure properties of wurtzite ZnO nanoparticles was studied according to Mn doping in the powder samples. The investigations were conducted by X-ray Absorption Fine structure spectroscopy(XAFs) technique for the samples prepared with different heating and doping processes. Electronic analysis was carried out by the collected data from the X-ray Absorption Near-Edge structure spectroscopy(XANEs) measurements. Additional crystal structure properties were studied by Extended-XAFs(EXAFs) analysis. Longer heating periods for the undoped wurtzite ZnO samples were determined to own stable crystal geometries. However, for some doped samples, the distortions in the crystal were observed as a result of the low doping amounts of Mn which was treated as an impurity. Besides, the changes in oxygen locations were determined to create defects and distortions in the samples.

关键词： Electronic materials Nanostructures Oxides XAFs(EXAFs and XANEs) Crystal structure

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