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Study of the structure and mechanical properties of magnesium casting alloys

Study of the structure and mechanical properties of magnesiu...

引用

16th International Federation for Heat Treatment and Surface Engineering Congress

作者： Dobrzański, L.A. Tański, T. Division of Materials Processing Technology and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Konarskiego St. 18a 44-100 Gliwice Poland

In this paper there is presented the structure and proprieties of the modeling cast magnesium alloys as cast state and after heat treatment. The presented results concern X-ray qualitative and quantitative microanalysis, tensile tests and hardness measurements and transmission electron microscopy. A casting cycle of alloys has been carried out in an induction crucible furnace using a protective salt bath Flux 12 equipped with two ceramic filters at the melting temperature of 750±10°C, suitable for the manufactured material. The heat treatment involve the solution heat treatment (warming material in temperature 375 ° C by 3 hour, it elevation temperature to 430° C, warming by 10 hours) and cooling in different cooling mediums as well water, air and furnace. The improvement of the manufacturing technique and chemical composition as well as of heat treatment and cooling methods leads to the development of a material designing process for the optimal physical and mechanical properties of a new developed alloy.

关键词： Precipitation (chemical)

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Investigation of laser texturisation for multicrystalline silicon solar cells

Investigation of laser texturisation for multicrystalline si...

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16th International Federation for Heat Treatment and Surface Engineering Congress

作者： Dobrzański, L.A. Drygala, A. Division of Materials Processing Technology Management and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Konarskiego Str. 18a 44-100 Gliwice Poland

The aim of the paper is to elaborate a method of texturisation multicrystalline silicon. The main reason for taking up the research is that most conventional methods used for texturisation of monocrystalline silicon are ineffective when applied for texturing multicrystalline silicon. This is related to random distribution of grains of different crystalographic orientations on the surface of multicrystalline silicon. As a result, the texture of different shapes is produced on grains of different orientation. The paper develops laser texturing method which seems to be able to isotropically shape the surface of multicrystalline silicon regardless of crystallographic orientation. When combined with alkaline etching proposed method makes it possible to effectively texture the surface of multicrystalline silicon. Evaluation of results was performed by confocal laser scanning microscope and scanning electron microscope (SEM). Laser surface processing was found to be very promising method in texturing multicrystalline silicon.

关键词： Scanning electron microscopy

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Structure and properties of WC/HS6-5-2 gradient tool materials

Structure and properties of WC/HS6-5-2 gradient tool materia...

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16th International Federation for Heat Treatment and Surface Engineering Congress

作者： Dobrzański, L.A. Kloc-Ptaszna, A. Matula, G. Torralba, J.M. Division of Materials Processing Technology Management and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Konarskiego St. 18a 44-100 Gliwice Poland Universidad Carlos III de Madrid Avda. Universidad 30 E-28911 Leganés Spain

The goal of this work is to obtain gradient materials based on a high-speed steel HS6-5-2 reinforced with tungsten carbide (WC). The material presented in this paper has layers at one side consisting of the high-speed steel, characterized by a high ductility and at the other side the carbide-steel characterized by a higher hardness. The materials were fabricated using the conventional powder metallurgy method. The layers inside the material are mixes of the high-speed steel powders with the WC ones in various proportions. The uniaxial pressing consisting in compacting the powder in a closed die, and subsequent sintering. Density and hardness of the obtained materials were measured. The sintered test pieces were also examined using the scanning electron microscope (SEM) equipped with the back-scatter electrons detector (BSE) and the dispersive energy analyser (EDAX D4). It was observed that the properties of as-sintered gradient materials are strongly affected by the tungsten carbide content and sintering parameters. The density of the test pieces grows along with the sintering temperature increase. The porosity grows along with the WC content growth in the particular layers. It was observed that also the sintering time has an effect on the porosity growth. The longer the sintering time is, the higher the porosity is. The hardness of the compacted and sintered test pieces, measured using the Rockwell method, grows along with the sintering temperature increase. It was noted that application of a longer sintering time results in slight HRA hardness lowering. It was found out, basing on the comparison of tructures and properties of the compacted and sintered test pieces, that in structures of all examined test pieces in the sintered state fine carbides occurred, distributed homogeneously in the high-speed steel layer. Developed material can be applied to manufacturing cutting tools. Forming methods were developed for high-speed steel and WC powders, making it possible t

关键词： Tungsten carbide

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Finite element method application for modeling of PVD coatings properties

Finite element method application for modeling of PVD coatin...

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5th International Surface Engineering Conference

作者： Dobrzański, L.A. Śliwa, A. Sitek, W. Division of Materials Processing Technologies and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Gliwice Poland

ISBN: (纸本)0871708434

The paper presents the possibility to apply the Finite Element Method for evaluation of stresses in the Ti+TiN, Ti+Ti(CxN1-x), Ti+TiC coatings obtained in the magnetron PVD process on the sintered high-speed steel of the ASP 30 type, taking into account their deposition conditions. Defined model of the tool coated with the coatings in the PVD process was verified by comparison with the results of computer simulation of stresses with the experimental results. computer simulation of stresses was carried out in ANSYS environment, using the FEM method and the experimental values of stresses were determined basing on the X-ray diffraction patterns.

关键词： Protective coatings

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Comparison of the structures of the hot-work tool steels laser modified gradient layers

Comparison of the structures of the hot-work tool steels las...

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PICALO 2006 - 2nd Pacific International Conference on Applications of Laser and Optics

作者： Bonek, M. Dobrzański, L.A. Division of Materials Processing Technologies and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Konarskiego 18a 44-100 Gliwice Poland

ISBN: (纸本)0912035846

The following review paper is a synopsis of the fundamentals of laser remelting and alloying, outlining some of its benefits compared with conventional heat treatment techniques of hot-work tool steel X40CrMoV5-1. A selective review of the experimental research carried out in this area is presented. The aim of such treatment was to harden and alloy the steel surface which had been previously coated with the paste consisting of the tungsten carbide and the inorganic binder. Development of the surface layer was observed in which one can distinguish the remelted zone, heat-affected zone and the transient zone. Occurrences of the un-melted tungsten carbide grains were observed in the structure and the increased tungsten content compared to the native material, whose variable concentration is connected with the molten metal fluctuation in the pool during alloying. The fine grained, dendritic structure occurs in the remelted and alloyed zone with the crystallization direction connected with the dynamical heat abstraction from the laser beam influence zone. It has the important cognitive significance and gives grounds to the practical employment of these technologies for forming the surfaces of new tools and regeneration of the used ones.

关键词： Tungsten carbide

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Structure and properties of selected cemented carbides and cermets covered with TiN/(Ti,Al,Si)N/TiN coatings obtained by the cathodic arc evaporation process

Structure and properties of selected cemented carbides and c...

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作者： Dobrzañski, Leszek A. Golombek, Klaudiusz Division of Materials Processing Technology and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology ul. Konarskiego 18A 44-100 Gliwice Poland

This study presents the results of microstructural examinations, mechanical tests and service performance tests carried out on thin TiN/(Ti,Al,Si)N/TiN wear resistance coatings obtained by the CAE process on cermet and cemented carbide substrates. Microstructural examinations of the applied coatings and the substrate were made with an OPTON DSM 940 SEM and a LEICA MEF4A light microscope. Adhesion of the coatings on cemented carbides and cermets was measured using the scratch test. The cutting properties of the materials were determined from service tests in which continuous machining of C45E steel was carried out. The hardness of the substrate and the microhardness of the coatings were determined with a DUH 202 SHIMADZU ultra microhardness tester with a load of 70 mN. Roughness tests were also carried out before applying the coatings and after the PVD process. Cutting tests confirmed the advantages of the TiN/(Ti,Al,Si)N/TiN type coatings obtained using the PVD method in the CAE mode on cemented carbides and cermets, as a material that undergoes very low abrasive, thermal and adhesion wear. These coatings extend tool life compared to commercially available uncoated tools with single and multi-layer coatings deposited using PVD/CVD methods.

关键词： Carbides

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Effect of cooling rates on the properties of Ni-Mo and Ni-Mo-W sintered steels

Effect of cooling rates on the properties of Ni-Mo and Ni-Mo...

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European Powder Metallurgy Congress and Exhibition, Euro PM 2005

作者： Actis Grande, M. Otreba, J. Pallavicini, E.J. Costa, P. Rosso, M. Dobrzanski, L.A. Politecnico di Torino-Sede di Alessandria Viale T. Michel 5 15100 Alessandria Italy Division of Materials Processing Technology and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology ul. Konarskiego 18A 44-100 Gliwice Poland R and D Pometon S.p.A. via Circonvallazione 62 30030 Martellago Italy

ISBN: (纸本)9781899072187

The paper deals with mechanical and microstructural characteristics of Ni-Mo and Ni-Mo-W (with increasing quantities of tungsten, from 0 to 0,3% wt.) sintered steel. The effect of chemical composition and of the applied vacuum sintering (plus rapid cooling) are investigated in terms of mechanical properties, focusing, in particular, on the wear properties. Microstructure observations are performed using LOM and SEM, the latter being used, together with EDS, for phase distribution and mapping.

关键词： Sintering

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Preface

引用

Journal of materials processing technology 2005年第0期162-163卷 1-3页

作者： Dobrzánski, L.A. Division of Materials Processing Technology AndComputer Techniques in Materials Science Institute of Engineering Materials AndBiomaterials Silesian University of Technology Konarskiego St. 18a 44-100 Gliwice Poland

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Preface

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Journal of materials processing technology 2004年 157-158卷 1-2页

作者： L.A. Dobrański Division of Materials Processing Technology and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Konarskiego St. 18a 44-100 Gliwice Poland

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A real-time multisensory image segmentation algorithm with an application to visual and X-ray inspection

A real-time multisensory image segmentation algorithm with a...

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Lecture Notes in computer Science

作者： Ding, Yuhua Vachtsevanos, George J. Yezzi Jr., Anthony J. Daley, Wayne Heck-Ferri, Bonnie S. School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States Food Processing Technology Division Electro-Optics Environment and Materials Laboratory Georgia Tech Research Institute Atlanta GA 30332-0837 United States

A new multisensory image segmentation algorithm is presented. In this algorithm, the images from different sensors are segmented in a sequential manner using curve evolution methods. There are no fusion rules involved and no controlling weights to adjust. It is effective in eliminating errors in single modality segmentation, and is fast enough for segmentation in real-time applications. The algorithm is applied to real-time fan bone detection in deboned poultry meat based on visual and x-ray images. Results show that the fusion-based inspection algorithm is efficient, accurate, and robust to registration errors. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Image segmentation

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