Căutare 1993 -2018 după Data publicării

Afișează articolele 221-240 of 552

    • Study of the RV52 Steel Plates Properties After Thermic Treatment 

      Vlad, Maria; Constantinescu, Stela (Universitatea "Dunărea de Jos" din Galați, 2009)
      The thermal treatment of RV52 steel plates determines high mechanical properties such as: strength, wear resistance and tenacity. The normalized plate samples were studied to determine the effect of the tension release ...

    • The Steam-Secondary Source of Energy in Metallurgy 

      Ivănescu, Lilica (Universitatea "Dunărea de Jos" din Galați, 2009)
      The paper is focused on a study of how to use the steam from recovery boilers of LD converters to produce electricity in turbine generators and heat in a heat network.

    • Physical-Chemical Properties (Cu-Sn) -Mo Composite Materials 

      Grechanyuk, I. N.; Grechanyuk, V. G.; Artuh, Y. U. (Universitatea "Dunărea de Jos" din Galați, 2009)
      The article is devoted to the study of corrosive and thermal stability of materials composition on the basis of copper, obtained by the EB-PVD method. It is shown in this work that corrosion of (Cu-Sn)–Mo composites have ...

    • Characterization of Thick Hard Layers with ni-Cr-B-Fe-Al Alloy Obtained by Laser Cladding 

      Drugescu, Elena; Boiciuc, Simona; Gheorghieș, Constantin (Universitatea "Dunărea de Jos" din Galați, 2009)
      To increase the resistance to wear and corrosion of the surface layers made from steel with 0.45% C, multilayer deposition was tested by injection of powder with chemical composition of 8.9% Cr, 4.5% Fe, 5.1% B, 2, 4% ...

    • Studies Regarding Nickel Electrodeposition from Watts bath with Addition of Polyvinylpyrrolidone and Sodium Saccharine 

      Vasilache, Violeta; Gutt, Sonia; Gutt, Georg; Sandu, Ion; Vasilache, Traian; Sandu, Victor Andrei (Universitatea "Dunarea de Jos" din Galați, 2009)
      This paper is based on some studies about the influence of polyvinylpyrrolidone (PVP) and sodium saccharine as far as concern their influence on the nickel electroplating processes from Watts bath. PVP is a wetting ...

    • EDX Analysis of Laser Cladding Layers with Ni-Cr-B-Fe-Al Alloy 

      Boiciuc, Simona; Drugescu, Elena; Miculescu, Florin; Cantaragiu, Alina (Universitatea "Dunărea de Jos" din Galați, 2009)
      Multilayer cladding by injection of powder with 8.9% Cr, 4.5% Fe, 5.1% B, 2.4% Al, 0.6% Cu, Ni rest as chemical composition, in melted bath by a continuous wave CO2laser connected to x-y-z coordinate table was tested in ...

    • Analysis of Titanium Inteface and Tungsten Exterior layer Thickness Coated by Vibrator Electrode Method 

      Perju, Manuela Cristina; Gălușcă, Dan-Gelu; Nejneru, Carmen; Vizureanu, Petrică; Lărgeanu, Anca-Elena (Universitatea "Dunărea de Jos" din Galați, 2009)
      The goal of this paper is to create metallic materials with superior functional performances. The layer obtained by electrode vibrator method must have a very good adherence on part surface and a high chemical and thermal ...

    • Experimental Researches Concerning the Influence of the Oxynitrocarburizing Thermochemical Treatment Over the Structure and Corrosion Resistance of C40 Steel 

      Boicea, Nicolae; Abrudeanu, Mărioara; Ducu, Cătălin (Universitatea "Dunărea de Jos" din Galați, 2009)
      The aim of the paper is to present the results of the experimental researches regarding the corrosion behaviour of C40 steel, thermochemical treated by oxidant nitrocarburizing at 570°C. The thermochemical treatment was ...

    • Researches Regarding Temperature Influence on Classic and Synthetic Quenching Medium 

      Grecu, Adrian; Nejneru, Carmen; Axinte, Mihai; Hopulele, Ion; Gălușcă, Dan-Gelu (Universitatea "Dunărea de Jos" din Galați, 2009)
      In this paper were analyzed experimental graphics for quenching cooling curves of oil at 20°C,40°C,60°C, 80°C and carboxymethyl cellulose (CMC) 1,5% solution in water at the same temperatures. Velocity cooling was studied ...

    • Utilisation of Electrochemical Methods for Characterization of Some Corrosion Inhibitors for Steel and Copper 

      Constantin, Florina; Abrudeanu, Mărioara; Millet, Jean-Pierre (Universitatea "Dunărea de Jos" din Galați, 2009)
      The effect of chromate and molybdate on the corrosion inhibition of copper and steel has been investigated in two eutectics solution at room temperature. We used stationary electrochemical methods and optical microscopy ...

    • Cladding by Welding with Hard Alloys 

      Dima, Ovidiu (Universitatea "Dunărea de Jos" din Galați, 2009)
      The paper presents the results of a research on the role of cladding by welding support of continuous casting plant. Emphasizing that plating leads to outer layer the study presents a complex of properties favorable for ...

    • Study Regarding Gravimetrical Corrosion of the Superficial Layers Obtained Through Electrical Discharge 

      Barhalescu, Mihaela; Dinescu, Maria; Pascu, Rovena (Universitatea "Dunărea de Jos" din Galați, 2009)
      The experimental research was made on superficial layers laid-down through electrical sparking on the steel carbon OLC 45 probes, the used electrode being made from a corrosion resistant material (Copper). The probes ...

    • Influence of Technological Parameters on the Evolution of Nickel Films Deposited by Electrolysis 

      Poroch-Serițan, Maria; Gutt, Gheorghe; Bobu, Maria; Severin, Traian; Stroe, Silviu; Mihoc, Carmen (Universitatea "Dunărea de Jos"din Galați, 2009)
      The influence of technological parameters on the structure of nickel layers electrodeposited on a copper substrate in a Watts bath has been studied. The complex influence of current densities, temperature and pH values ...

    • Preliminary Investigations Concerning Monitoring of Water Pollution Level 

      Cosor (Rusu), Daniela Ecaterina; Munteanu, Viorel; Gheoghieș, Constantin (Universitatea "Dunărea de Jos" din Galați, 2009)
      The aim of this paper is to develop an effective tool based on artificial intelligence techniques for monitoring and characterization of surface waters. Monitoring of the pollution in the aquatic environment consists in ...

    • Redesigning a Jaw Crusher Using Value Analysis. Part II 

      Chichernea, Florin; Chichernea, Alexandru (Universitatea "Dunărea de Jos" din Galați, 2009)
      The paper presents a complete study of VALUE ANALYSIS applied concretely to a selected piece of equipment. The phases and ITERATIVE operation of the Value Analysis method are presented. Value Analysis combines both ...

    • Variation of Mechanical Characteristics for Thin Wall Tubes Processed in Ultrasonic Field 

      Susan, Mihai; Achiței, Cristian; Ștefanică, Roxana Gabriela; Gavrilă, Bogdan Lucian (Universitatea "Dunărea de Jos" din Galați, 2009)
      The paper presents the variation of mechanical characteristics of resistance and plasticity for thin wall tubes made of stainless steel 10TiNiCr180, processed in ultrasonic field. Decrease of mechanical characteristics ...

    • The temperature Effect on Severely Deformed Aluminium by High Pressure Torsion 

      Gurău, Carmela; Gurău, Gheorghe; Cănănău, Nicolae; Potecașu, Florentina; Dogaru, Victor; Fernandes, FM Braz (Universitatea "Dunărea de Jos" din Galați, 2009)
      The process of deforming materials started to attract the interest of the researchers after the development of the severe plastic deformation techniques. A number of aluminium samples were severe deformed by HPT method ...

    • Study on the Influence of the Chemical Composition in the Thermomechanical Processing of the Steel 

      Vasilescu, Elisabeta; Vasilescu, Ioan; Doniga, Ana; Neacșu, Marian (Univesitatea "Dunărea de Jos" din Galați, 2009)
      This paper presents the results of industrial scale researches on the influence of the chemical composition on the characteristics of high yield point plates of wieldable fine grain steels. The comparative study of the ...

    • Severe Plastic Deformed Pure Aluminum by Equal Channel Angular Pressing 

      Gurău, Gheorghe; Gurău, Carmela; Tănase, Dinel (Universitatea "Dunărea de Jos" din Galați, 2009)
      Samples of an aluminum alloy were subjected to an equal channel angular pressing (ECAP) at room temperature for one pass. For the several specimens severe plastic deformation process was interrupted to observe the material ...

    • Rapid Synthesisof ZnO Micro and Nanostructures 

      Plăiașu, Adriana Gabriela; Abrudeanu, Mărioara (Universitatea "Dunărea de Jos" din Galați, 2009)
      This paper focuses on the newer chemical synthesis of zinc oxide powders and the effects of reaction temperature and possible mechanism of ZnO formation. The study of the reaction mechanism at different temperatures has ...