Microstructural Evolutions and Mechanical Properties of Drawn Medium Carbon Steel Wire

International audienceThis study focuses on the evolution in the microstructure, texture and mechanical properties of medium carbon steel wires obtained by wire drawing at Tréfissoud Company for the manufacturing of the spring mattress. Wire drawing induces elongation of grains in the direction of drawing with the development of the fibre texture parallel to the wire axis. Kinking and bending of cementite lamellae were observed during the drawing process. The work was carried out respectively on three states, wire rod and drawn states for two different amounts (ε %=43,6 and 60 %), using the optical and SEM microscopy, electron backscatter diffraction and X-ray diffraction analysis for examination of the microstructure and texture evolution, the hardness Vickers and tensile test to follow the curing of the studied wires

Etude de la tenue à la corrosion de l’acier N80 et évaluation de l’efficacité d’un inhibiteur de corrosion

Cette étude traite des problèmes de la tenue à la corrosion de l’acier au carbone dans des milieux aqueux acides, basiques et neutres. L’emploi des inhibiteurs est l’une des méthodes les plus utilisées pour protéger les métaux contre la corrosion. La plupart des inhibiteurs se composent essentiellement de molécules actives qui agissent par l’adsorption sur la surface du métal et forment une couche protectrice contre la corrosion. La tenue à la corrosion et l’effet de l’addition des inhibiteurs sur la corrosion de l’acier N80 ont été étudiés en utilisant les mesures de perte de masse et les courbes de polarisation. The objective of this memoir is to study the problems of corrosion resistance of N80 carbon steel in aqueous acidic, alkaline and neutral environments. The use of inhibitors is one of the most practical methods for the protection of metals against corrosion. Most inhibitors are mainly composed of active molecules act by adsorption on the metal surface and form a protective layer against corrosion. The corrosion resistance and the effect of the addition of inhibitors on the corrosion of N80 steel have been studied using the weight loss measurements and the polarization curve

Etude de l’évolution microstructurale, texturale et de comportement mécanique des fils en acier mi-dur tréfilés industriellement.

This study is carried out as part of a scientific collaboration with the national wire drawing and welding products manufacturing company (TREFISOUD) of El-Eulma, Sétif. The aim of this research work is to highlight the relationship between microstructural evolution and the mechanical properties of medium carbon steel drawn wires (C68D-2 and D45-2) intended for the manufacture of spring mattresses. The study was mainly oriented on the evolution of the crystallographic texture as a function of the deformation resulting from the industrial wire drawing process. This, in fact, will make it possible to establish a relationship between the microstructure and the variation in the mechanical properties of the wires and therefore to identify the problem of breakage of the wire during the use of these two medium carbon steel wires obtained by wire drawing and used in the manufacture of spring mattresses and also to save the losses generated and to qualitatively satisfy the users. A variety of experimental measurement and characterization technics are used in this work. These are optical microscopy, scanning electron microscopy (SEM), X-ray diffraction, back scattered electron diffraction (EBSD), tensile and torsional tests and micro-hardness measurements, some of which have allowed correlate the microstructure with mechanical properties

Texture analysis of mild steel soldering rod

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