Căutare 2005 fascicula9 nr2 după Titlu

Afișează articolele 9-22 of 22

    • Laser Cladding of High-Speed Steel on a Steel Support 

      Levcovici, Dan Teodor; Boiciuc, Radu; Levcovici, Sanda Maria; Gheorghieș, Constantin (Universitatea "Dunărea de Jos" din Galați, 2005)
      Multilayer cladding by injection of high-speed steel powder with 0.82%C, 4.7%Mo, 6.4%W, 4.1%Cr, 2.02%V, 0.3%Mn, as chemical composition, in melted bath by CO2 continuous wave laser connected to x-y-z coordinate table was ...

    • Laser Surface Hardening of 51Crv4 Steel 

      Levcovici, Sanda Maria; Levcovici, Dan Teodor (Universitatea "Dunărea de Jos" din Galați, 2005)
      The work presents the surface changes in microstructure and properties by quenching the 51CrV4 steel from liquid and solid phase, using a CO2 continue laser wave with 900W power. In order to determine the hardening ...

    • Mathematical Model of the Strip Rolling Made of the Sinterized Metallic Powders 

      Petrea, Ionel; Istrate, Sorin Miltiade (Universitatea "Dunărea de Jos" din Galați, 2005)
      The minimum-power method has been used to investigate the final ratio soft-layer thickness to tough-layer thickness in bimetals with porous layer rolling. The velocity fields has been determined and the total deformation ...

    • Modelling of the Flow and Deformation Fields at teh Profiles Rolling by Field Lines Method 

      Cănănău, Nicolae; Petrea, Ionel; Corobete, Gheorghe (Universitatea "Dunărea de Jos" din Galați, 2005)
      This paper presents a method for modeling of the rolling process based at the deformable continuous medium mechanics, the theory of field lines. The rolling of the profiles and plates may be evaluated as the plane strain ...

    • Physico-Mechanical Characteristics of Hard Alloys Made Out of Many Carbides 

      Constantinescu, Stela (Universitatea "Dunărea de Jos" din Galați, 2005)
      The Hard alloys of type WC-TiC-Co can be used to process materials with long chips, such as steels [1]. Titanium carbide or TiC-WC solid solutions, added as alloying constituents in the compositions of WC-Co pseudo-alloys ...

    • Reasearches Regarding Structural Changes Due to Nickel Microlalloying of Hot Galvanizing Baths 

      Boiciuc, Radu; Preda, Adriana; Boiciuc, Simona (Universitatea "Dunărea de Jos" din Galați, 2005)
      This work offers a synthesis of researches performed in laboratory and regards the nickel microalloying of hot galvanizing baths. Experiments followed the structural changes of both hot galvanizing bath and deposed layer ...

    • Researches Concerning the Correlation of the Semiplanetary Rolling Process Factors 

      Cănănău, Nicolae; Alexandru, Petrică; Gurău, Gheorghe; Preda, Adriana (Universitatea "Dunărea de Jos" din Galați, 2005)
      An available solution of the elimination of the superficial cracks network at the continuous cast slabs is the semiplanetary rolling. The application of a semiplanetary rolling mill at the exit of slab from the curve zone ...

    • Researches Regarding Improvement of the Fatigue Limit by Heat Treatments of the Al-Alloys for Aeronautics Industry 

      Doniga, Ana; Vasilescu, Elisabeta; Istrate, Miltiade; Vasilescu, Ioan; Măcuță, Silviu (Universitatea "Dunărea de Jos" din Galați, 2005)
      The laboratory experiments were made on the two aluminium alloyed qualities used for aeronautical industry. The structure and mechanical characteristics were analyzed and the gotten results were compared using those two ...

    • Researches Regarding the Rolling of the Sinterized Metallic Powders Strips 

      Istrate, Sorin Miltiade; Petrea, Ionel (Universitatea "Dunarea de Jos" din Galați, 2005)
      This paper work is distinguishing the size modification of those two material layers gotten by the bimetallic strip rolling, joined by the sintering. The iron powders sediment was achieved on the steel strip backing. ...

    • Researches Regardingbthe Thermomechanical Treatments Influence on the Structure and Characteristics of the Aluminium Alloys for Aeronautics 

      Vasilescu, Elisabeta; Doniga, Ana (Universitatea "Dunărea de Jos" din Galați, 2005)
      The laboratory experiments were made on the two aluminium alloyed qualities used for aeronautical industry. More working conditions of the intermediary (PTMI) and finally (PTMF) thermomechanical treatments were used on ...

    • The Actionnary System of the Continnous Discharge Furnace from L.T.G.-1. Mittal Steel 

      Dragomir, Ștefan; Tudor, Beatrice; Bordei, Marian (Universitatea "Dunărea de Jos" din Galați, 2005)
      In this study the authors made a systematically research about the actionnary system at the continuous discharge heating furnace. It take in account the possibility to use a new material, with most good wear resistance, ...

    • The Computation of the Calended Rolls Deflection Using the Stone-Gaevski Formulae 

      Florescu, Daniela; Florescu, Iulian (Universitatea "Dunărea de Jos" din Galați, 2005)
      This paper presents new models for the change of the internal configuration of the paper calender rolls with extension to those for plastics and rubber, and the deflection calculation procedure using Stone-Gaevski formulae.

    • The Use of Systems Analysis in Environmental Engineering 

      Paraschiv, Spiru; Paraschiv, Lizica Simona; Ion, Ion V. (Universitatea "Dunărea de Jos" din Galați, 2005)
      The depletion of energy resources has been of primary concern in the `70s and `80s. In recent years, the decline of the environment due primarily to our energy-related activities has become severe and raises serious ...

    • The Value of the Structural Remanence and Thermic Tensions in the Forged Pieces 

      Ciurea, Aurel; Bordei, Marian (Universitatea "Dunărea de Jos" din Galați, 2005)
      The plastic deformation, the heating and the cooling of the pieces submitted to plastic deformations acumulate remanent tensions inside the pieces. Knowing the environmental where they are produced and avoiding its ...