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第六届国际低合金高强度钢会议

作者： Ozgowicz Wojciech Labisz Krzysztof Division of Constructional and special Materials Division of Materials Processing Technology Management and Computer Techniques in Materials ScienceInstitute of Engineering Materials and BiomaterialsSilesian University of TechnologyKonarskiego St.18A44-100 GliwicePoland

The paper deals with investigations concerning the structure and state of dispersive precipitations of the phases consolidating in the high-strength steel Weldox 1300 after its high temperature thermomechanical treatment. Making use of transmission technique of electron microscopy(TEM) mainly the microstructure and morphology of martensite was analysed,as well as the state of dispersive precipitations of carbides and nitrides resulting from microadditives of such alloys as Nb,V,Ti or B,introduced into the *** revealed both a fine lathed and twin structure of the matrix of martensite in the investigated *** means of the method of electron diffraction particles of secondary strengthening phases of the M(C,N) type of a nanocrystalline size could be identified,and also non-metallic oxide inclusions,affecting the mechanism of strengthening of the investigated steel.

关键词： weldox 1300 HSLA steel thermomechanical treatment martensitic steel structural steel

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Laser surface treatment of Mg-Al-Zn alloys

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Strojarstvo 2011年第1期53卷 5-10页

作者： Dobrzanski, Leszek Adam Tanski, Tomasz Malara, Szymon Domagala, Justyna Klimpel, Andrzej 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 Welding Department Silesian University of Technology ul. Konarskiego 18a 44-100 Gliwice Poland

In this paper the structure and properties investigations results of the cast magnesium alloys in the as cast state, after heat treatment and laser surface treatment are presented. The aim of this work was to improve the surface layer properties of the Mg-Al-Zn cast magnesium alloys by melting and feeding of TiC, VC, WC, SiC, NbC and Al2O3 particles onto the surface. Laser processing was carried out using high diode power laser (HDPL). A series of experiments was carried out with varying scan rates and laser power. The resulting surface layers were examined using metallographic optical microscopy, scanning electron microscopy, X-ray diffraction, microhardness measurements and corrosion resistance tests. Mg-Al-Zn alloys after laser treatment are characterized by two zones: alloyed zone (AZ) and heat affected zone (HAZ) with different thickness and shape depending on laser power and ceramic powder used. Alloyed zone is composed mostly of dendrites with the Mg17Al12 lamellar eutectic and Mg in the interdendritic areas. The increase of microhardness from about 50 HV0,1 to about 200 HV0,1 in alloyed zone were observed.

关键词： Magnesium alloys

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Rare earths metals microstructure modification of chosen Al-Si alloys

Rare earths metals microstructure modification of chosen Al-...

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第六届国际稀土开发与应用研讨会

作者： L.A.Dobrzanski M.Krupinski K.Labisz Z.Rdzawski Division of Materials Processing Technology Management and Computer Techniques in Materials ScienceInstitute of Engineering Materials and BiomaterialsSilesian University of TechnologyKonarskiego St.18a44-100 GliwicePoland

The investigations were performed on the cast aluminium-silicon alloy,according to the EN AC-4XXXX standard with added rare earths metals as modificators. The used methodology was based on the usage of a UMSA(Universal Metallurgical Simulator and Analyzer)which has allow to determine the liquidus/solidus thermal points of the solidified Al-Si alloy,as well the thermal points,where a phase or eutectic crystallisation ***

关键词： Aluminium alloys Rare earths metals derivative thermoanalysis

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Influence of aluminium content on behaviour of magnesium cast alloys in bentonite sand mould

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

ISBN: (纸本)3908451655

In this paper there is presented the structure and proprieties of the modeling cast magnesium alloys as cast state and after heat treatment, depending on the cooling medium (furnace, water, air), with different chemical composition. 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. In the analysed alloys a structure of α solid solution and fragile phase β (Mg 17Al12) occurred mainly on grain borders as well as eutectic and AlMnFe, Mg2Si phase. The investigation is carried out to testy the influence of the chemical composition and precipitation processes on the structure and mechanical properties of the magnesium cast alloys with different chemical composition in its as cast alloys and after heat treatment. © (2009) Trans Tech Publications.

关键词： Heat treatment

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Influence of aluminium content on behaviour of magnesium cast alloys in bentonite sand mould

Solid State Phenomena

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Solid State Phenomena 2009年 147-149卷 764-769页

In this paper there is presented the structure and proprieties of the modeling cast magnesium alloys as cast state and after heat treatment, depending on the cooling medium (furnace, water, air), with different chemical composition. 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. In the analysed alloys a structure of a α solid solution and fragile phase β (Mg17Al12) occurred mainly on grain borders as well as eutectic and AlMnFe, Mg2Si phase. The investigation is carried out to testy the influence of the chemical composition and precipitation processes on the structure and mechanical properties of the magnesium cast alloys with different chemical composition in its as cast alloys and after heat treatment. © (2009) Trans Tech Publications Ltd, Switzerland.

关键词： Magnesium alloys

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Comparison of structure and properties of the PVD, Hybrid (Galvanic + PVD), and galvanic coatings deposited onto the brass substrate

Comparison of structure and properties of the PVD, Hybrid (G...

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6th International Latin American Conference on Powder technology, PTECH 2007

作者： Dobrzanski, Leszek A. Lukaszkowicz, Krzysztof Division of Materials Processing Technologies and Computer Techniques an Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Konarskiego St. 18a 44-100 Gliwice Poland

ISBN: (纸本)9780878493609

The properties of thin hard coatings and consequently their functionality are influenced by microstructural characteristics such as mechanical properties. A variety of interlayers has been used in hybrid coatings for various purposes. The paper presents investigation results of the structure, erosion and corrosion resistance, and mechanical properties of the galvanic Ni/Cr, hybrid Ni/Cr + Zr/ZrN (galvanic + PVD) and monolithic nitride coatings deposited by PVD technique (dc magnetron sputtering) onto brass (CuZn40Pb2) substrates. The ceramic PVD coatings or layers are the Cr-, Ti-, TiAl-, Zr-nitrides. The investigation covered the etallographic analysis on the scanning electron microscope, mechanical properties and erosion test. The corrosion tests were made in a 1 M NaOH solution. It was found out that PVD coatings display high corrosion resistance.

关键词： Corrosion resistance

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Properties and corrosion resistance of PM composite materials based on EN AW-Al Cu4Mg1(A) aluminium alloy reinforced with Ti(C,N) particles

Properties and corrosion resistance of PM composite material...

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作者： Dobrzanáski, Leszek A. Wlodarczy-Fligier, Anna Adamiak, Marcin 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

The paper presents investigation results of the heat treatment effect on the properties and corrosion resistance of sintered composite materials with EN AW-Al Cu4Mg1(A) alloy matrix reinforced with Ti(C,N) particles of various volume fractions. Composite materials were examined without heat treatment and after heat treatment which was carried out to improve their properties and corrosion resistance. It was found that the proportion of reinforcement particles Ti(C,N) has an effect on the mechanical properties of composite materials. An increase in hardness and decrease in compression strength, tensile strength and abrasive wear are observed with the increase in the fraction of reinforcement particles. The corrosion susceptibility of the composite materials was determined using the potentiodynamic method in a 3% aqueous solution of NaCl. Based on the determined anode polarisation curves and also on the electrochemical parameters, the investigated materials are susceptible to pitting corrosion. Copyright © 2007 Inderscience Enterprises Ltd.

关键词： Aluminum alloys

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Study of the structure and mechanical properties of magnesium casting alloys

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

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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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