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  • 1
    Electronic Resource
    Electronic Resource
    Laser Alloying with WC Ceramic Powder in Hot Work Tool Steel Using a High Power Diode Laser (HPDL) (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 193-198 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Investigations include alloying the X38CrMoV5-3 hot-work tool steel surface layer withthe tungsten carbide, using the high power diode laser (HPDL). The tungsten carbide ceramicparticles of the medium grain size according to FSSS = 50 /m were introduced using the rotorconveyer to improve the properties of the surface layer. The powder feed rate was set at the steadylevel of 8.64g/min. Remelting and alloying were carried out several times in the laser power rangeof 1.2 – 2.3 kW in the remelting/alloying, alloying/remelting sequences. The structural mechanismwas determined of gradient layer development, effect was studied of alloying parameters, gasprotection method, and powder feed rate on its mechanical properties, and especially on itshardness, abrasive wear resistance, and roughness. Structure changes were revealed consisting, inparticular, in its refining, and also hardness and microhardness changes in comparizon to the nonremeltedsteel. Examination results obtained with the EDX microanalysis, surface and linearanalysis of the chemical composition, as well as the X-ray qualitative phase analysis are presented
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.193.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of Vacuum Sintered Duplex Stainless Steels (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 828-833 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This work presents the possibility of obtaining duplex stainless steels through powdermetallurgy technology starting from austenitic X2CrNiMo17-12-2, martensitic X6Cr13 powders bycontrolled addition of alloying elements, such as Cr, Ni, Mo, Cu in the right quantity to obtain thechemical composition of the structure similar to biphasic one. Moreover the ferritic stainless steelX6Cr17 has been mixed to austenitic stainless steel in the ratio of 50%-50% in order to exam thederiving structure after sintering. In the studies behind the preparation of mixes, Schaffler’s diagramwas taken into consideration. Prepared mixes of powders have been compacted at 800 MPa andsintered in a vacuum furnace with argon backfilling at 1260°C for 1 hour; after sintering rapidcooling has been applied in N2
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.828.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Softmagnetic Nanocomposite with Silicon Polymer Matrix and Powdered Co〈sub〉68〈/sub〉Fe〈sub〉4〈/sub〉Mo〈sub〉1〈/sub〉Si〈sub〉13,5〈/sub〉B〈sub〉13,5〈/sub〉 (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 23 (Jan. 2005), p. 91-94 
    Details
    ISSN: 1422-6375
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Structure, magnetic and mechanical properties of the nanocrystalline composite material of the SILAME® type were tested. The composite material was obtained by solidification of the nanocrystalline powder obtained in the high energy grinding of the initially crystallized Co68Fe4Mo1Si13,5B13,5 amorphous strip with the silicon polymer. The metallic powder was mixed with the silicon polymer in a different weight ratio and next the effect of Co68Fe4Mo1Si13,5B13,5 powder weight ratio on the magnetic and physical properties of the composite was investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.23.91.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of Heat Treatment on Structure and Properties of the Cast Magnesium Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 491-496 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper is presented the structure and proprieties of the cast magnesium alloys ascast state and after heat treatment cooled with different cooling rate, depending on the coolingmedium (furnace, water, air). For investigations samples in shape of 250x150x25 mm plates wereused. The presented results concern X-ray qualitative and quantitative microanalysis as well asqualitative and quantitative X-ray diffraction method, tensile tests, hardness measurement. In theanalysed alloys a structure of α %solid solution and fragile phase β (Mg17Al12) occurred mainly ongrain borders as well as eutectic and phase AlMnFe, Mg2Si. Investigation are carried out for thereason of chemical composition influence and precipitation processes influence to the structure andmechanical properties of the magnesium cast alloys with different chemical composition in as castalloys and after heat treatment
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.491.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Comparison of Mechanical Properties of the 32CrMoV12-28 Hot Work Tool Steels Alloyed with WC, VC and TaC Powder Using HPDL Laser (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1233-1236 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This work presents the investigation results of laser remelting and alloyingespecially the laser parameters and its influence on the structure and properties of the surfaceof the 32CrMoV12-28 hot work steel, using the high power diode laser (HPDL). As a resultstructure changes in form of fragmentation were determined. The reason of this work was todetermine the optimal laser treatment parameters, particularly the laser power to achieve goodlayer hardness for protection of this hot work tool steel from losing their work stability and tomake the tool surface more resistant to action in hard conditions. For alloying the tantalumcarbide, tungsten carbide and vanadium carbide powders were used. For investigationshardness measurements of the different remelting areas were performed. The remelted layerswhich were formed in the surface of investigated hot work steel were examinedmetallographically and analyzed using light and electron microscope. Three phases ofcarbides, TaC, VC and WC, were observed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1233.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of Cooling Rate on the Size of the Precipitates and Thermal Characteristic of Al-Si Cast Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 59-64 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this work effect of cooling rate on the size of the grains, SDAS, β phases and thermalcharacteristic results of Al-Si cast alloys have been described. The solidification process wasstudied using the cooling and crystallization curve at cooling rate ranging from 0,1 ºCs-1 up to1 ºCs-1. The main observation made from this work was that when cooling rate is increased thealuminum dendrites nucleation temperature and solid fraction at the dendrite coherency pointincreases, which implies that mass feeding is extended. In addition to that, it was observed thatsolidus temperature and size of the β phases decreases when cooling rate increases. Investigationswere showed, that the thermal modification could be quantitatively assessed by analysis of thecrystallization curve
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.59.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Diode Laser Modification of Surface Gradient Layer Properties of a Hot-Work Tool Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 657-660 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The objective of the present work was to study the modification of the microstructure ofhot-work tool steels X40CrMoV5-1 and X38CrMoV5-3 during the surface modifying by means oflaser technology. This treatment aims to harden and alloy the steel surface which had been previouslycoated with tungsten carbide (WC) and were introduced using the rotor conveyer to improve theproperties of the surface layer. The fine grained, dendritic structure occurs in the remelted and alloyedzone with the crystallization direction connected with the dynamical heat abstraction from the laserbeam influenced zone. The fine grained martensite structure is responsible for the hardness increaseof the alloyed layer
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.657.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Modified Tartagli Method for Calculation of Jominy Hardenability Curve (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 892-897 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Basing on the experimental results of the hardenability investigations, which employedJominy method, the model of the neural networks was developed and fully verified experimentally.The model makes it possible to obtain Jominy hardenability curves basing on the steel chemicalcomposition. The modified hardenability curves calculation method is presented in the paper,initially developed by Tartaglia, Eldis, and Geissler, later extended by T. Inoue. The method makesuse of the similarity of the Jominy curve to the hyperbolic secant function. The empirical formulaeproposed by the authors make calculation of the hardenability curve possible basing on the chemicalcomposition of the steel. However, regression coefficients characteristic for the particular steelgrade must be known. Replacing some formulae by the neural network models is proposed in thepaper
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.892.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    The Thermomechanical Processing Conditions and the Mechanical Properties of Injection Molded PP/PC Blends (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 587-588 (June 2008), p. 553-557 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This investigation aims at establishing the relationships between the thermomechanicalconditions and the mechanical properties of a direct injection moulded polypropylene/polycarbonateblend (70/30wt composition). Rectangular plates (2 mm thick) were injection moulded bysystematic variations of the processing conditions. The moulding programme was based on a designof experiments (DOE) approach, being considered variations in two levels of the melt (240 and280ºC) and the mould (5 and 80ºC) temperatures and the injection flow rate (3.8 and 38 cm3/s). Forcomparison purposes, neat polypropylene was also moulded under the same set of processingconditions. In both cases the thermomechanical environment was characterised by computersimulations of the mould filling phase using commercially available codes (Moldflow). Tensilespecimens were cut from the injected plates. The microstructure of the mouldings was characterizedby polarized light microscopy, PLM. The mechanical characterization encompass the assessment ofthe tensile (at 5 mm/min at 23 ºC) and impact toughness (unnotched Charpy test). The results areanalysed by ANOVA. The presence of PC particles affects the crystallization of PP, this beingrevealed on the mouldings microstructures observed by PLM that are distinct for the neat andPP/PC blends. The mechanical properties are determined differently by the processing variables
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.553.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Comparison of Structure and Properties of the PVD, Hybrid (Galvanic + PVD), and Galvanic Coatings Deposited onto the Brass Substrate (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 591-593 (Aug. 2008), p. 860-864 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The properties of thin hard coatings and consequently their functionality are influencedby microstructural characteristics such as mechanical properties. A variety of interlayers has beenused in hybrid coatings for various purposes. The paper presents investigation results of thestructure, erosion and corrosion resistance, and mechanical properties of the galvanic Ni/Cr, hybridNi/Cr + Zr/ZrN (galvanic + PVD) and monolithic nitride coatings deposited by PVD technique (dcmagnetron sputtering) onto brass (CuZn40Pb2) substrates. The ceramic PVD coatings or layers arethe Cr-, Ti-, TiAl-, Zr-nitrides. The investigation covered the metallographic analysis on thescanning electron microscope, mechanical properties and erosion test. The corrosion tests weremade in a 1 M NaOH solution. It was found out that PVD coatings display high corrosionresistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.860.pdf
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