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Effect of filler metal on mechanical properties and corrosion behavior of dissimilar metals welds

B. BELKESSA, D. Miroud, B. Cheniti, N. OUALI (2019)
Article de conférence

This work purposes to investigate the microstructure and the mechanical behavior of dissimilar metals weld between 2205 duplex stainless steel (UNS 31803) and high strength low alloy steel API X52. The joining was produced by shielded metal arc welding process using two different filler metals, the duplex E2209 and austenitic E309 grade.The microstructures of the dissimilar welded joints have been investigated by optical microscopy, scanning electron microscopy and energy-dispersive spectroscopy (EDS). The EDS analysis performed at the API X52/weld metal interface showed an evident gradient of Cr and Ni between fusion and type II boundaries, where the highest Nano hardness value was recorded.Voir les détails

Mots clés : Dissimilar metals welding; 2205 duplex stainless steel; API X52 HSLA steel; Heat-affected zone.

MANUFACTURING NANOSTRUCTURED AND MICROSTRUCTURED CHITOSAN PREPARED BY MILLING SHRIMP SHELL

Belmedani Mohamed, Hadoun Hocine, Belgacem Ahmed, Haddad Ahmed (2019)
Article de conférence

Nano-products are of great interest in the field of pharmaceutical, corrosion, medecine and engineering. This research aimed to produce nano-chitosan. Nanocrystallite. Shrimp shells have been prepared by using a high-energy planetary ball with an optimal rotational speed.The raw material was subjected to standard chemical processing for chitin extraction, followed by deacetylation to obtain nanocrystallite chitosan, which is characterized by Scanning Electron Microscope SEM and Fourier Transform Infrared Spectrometry FT-IR.Voir les détails

Mots clés : Shrimp shell, Planetary milling, chitosan, SEM, FT-IR, XRD

METALLURGICAL AND ELECTROCHEMICAL BEHAVIOR OF S295 STEEL TUBES IN STEEL COOLING CIRCUITS

A.Bendjama, K.Morakchi, D.Berdjane, T.Chouchane, O.KHIREDDINE, H.MAHFOUD, S.CHETTOUH (2019)
Article de conférence

Corrosion damage to industrial cooling systems in steel mills is a serious problem for industry and the environment. In order to reduce this phenomenon by the subsequent development of organic-based corrosion inhibitors, a preliminary identification study of the base material and the surrounding environment of the cooling circuits is essential. To monitor the electrochemical behavior of unalloyed steel tubes, we studied the influence of the "industrial cooling water" environment and the most influential physical parameters. This behavior of S295 grade steel will be determined by different stationary and non-stationary electrochemical methods, notably electrochemical impedance spectroscopy. These investigations enabled us on the one hand the metallurgical knowledge of the base material, the nature of the corrosive medium, and on the other hand the evaluation of the potentials and the corrosion rates and to define the different reactions at the metal interface. middle. In conclusion, the tubes studied in unalloyed steel have a low resistance to corrosion under the effect of the aggressiveness of the surrounding environment (Figure 1) in this case industrial cooling water hence the need to introduce corrosion inhibitors in cooling circuits. In our case, we will focus on natural organic inhibitors that ensure an economic and environmental balance. Figure.1: Stationary and frequential electrochemical curves of the material / medium interactionVoir les détails

Mots clés : steel, corrosion, behavior, cooling water, impedance, Temperature

STUDY OF THE THERMAL AND MORPHOLOGICAL PROPERTIES OF SOLID STEEL WASTE

Ouahida Khireddine, Toufik CHOUCHANE, Amel Bendjama, Sana Chibani, Atmane BOUKARI (2019)
Article de conférence

Slags, by-products of the manufacture of pig iron in blast furnaces of the iron and steel industries. In recent years, the steel industry has put in place several ways of upgrading these materials, but these methods concern recent and homogeneous slags, which are still difficult to apply to ancient slags. These accumulations of non-reusable heterogeneous materials are left behind, and we must understand what impact they can have on their environment in the medium and long term. The main objective of this work is to carry out a study on the use of co-products from the El-Hadjar Annaba Algerian steel plant (blast furnace slags). This involves physico-chemical characterisation of appropriate methods, including optical microscopy, X-ray diffraction, infrared beam transformed spectrometry and thermal analysis. The diffractograms obtained on the slag samples characterise the vitreous phase and some light lines representing the crystallised compounds. Powder analysis by IR infrared spectrometry, Spectrum shows identified bands, such as Al-O, Ca-O, and Si-O bonds These results were justified by X-ray diffraction (XRD) and thermal analysis (ATG and DSC).Voir les détails

Mots clés : Slags, characterization, Steel waste, physicochemical properties

VALORIZATION OF STEEL BYPRODUCTS IN THE FIELD OF ANTICORROSIVE PAINTS

H. FERDENACHE, M. T. Abedghars, F. Z. GASMI, B. BEZZINA, M. E. H. BENHAMZA (2019)
Article de conférence

The objective of this work is the valorization of an unavoidable by-product resulting from steel manufacturing at the El-Hadjar Iron and steel plant (Algeria). This by-product comes from oxidation of the outer layer of steel slabs and billets during cooling. This forms a crust called scale or calamine. In this study, the scale is used as a blend with iron pigments for the formulation of an anticorrosive paint. Several paint formulations at different scale (calamine) percentage have been prepared.The results of the various characterization tests i.e. dry extract, density, viscosity and corrosion test, show that the use of this new mixture as anti-corrosive paint gives encouraging results. In fact, immersion in a corrosive medium for 20 days at a concentration of 3.5% NaCl revealed a slight swelling on the painted sample surface. Optical microscope observation also displayed that the tested sample of 28.57% of calamine is the most resistant. This is furthermore confirmed by electrochemical analysis, where results are presenting low corrosion current and high potential close to the reference value.Voir les détails

Mots clés : Scale, calamine, iron Pigment, Anticorrosive paints

Two dimensional heat transfer numerical model for secondary cooling in continuous casting process

H. Tayoub, H. Bendjama, K. Hamlaoui, K. SLIMANI, S. AOUABDI (2019)
Article de conférence

The continuous casting process is responsible by most of the steel manufacturing in the entire world while maximizing production output. Although the continuous casting of steel began almost 60 years ago, its production still suffers from several serious defects in the final product. Since the process is essentially a process of heat transfer between the metal and different cooling zones, the quality of slabs in the continuous casting can be strongly influenced by the temperature variation through the process of solidification. Therefore, the objective of the present work is to determine a 2D numerical model of solidification and heat transfer along different cooling zones of a secondary cooling during continuous casting process. Numerical model has been created and the obtained numerical results from the present model show that the optimal control of the cooling parameters in secondary cooling is inevitable in order to obtain high-quality final product and casting productivity. Numerical results were validated and the comparison shows that there is a good agreement with experimental measurements.Voir les détails

Mots clés : Continuous casting of steel, secondary cooling, Heat transfer, Defect, solidification

Effect of deformation on dry sliding wear behavior of 13Cr5Ni2Mo supermartensitic stainless steel

Samira. Tlili, Chems Eddine RAMOUL, Soumaya MEDDAH, Amel OULABASS (2019)
Article de conférence

During drilling, the tubings are subjected to tensile, compressive and torsional stresses. In this present work, the effect of deformation on wear of 13Cr5Ni2Mo SMSS in dry conditions is investigated using the tensile test. All samples were taken for the calibrated area of the 2%, 10% and 15% deformed specimens. The tribological tests were carried out at room temperature under a 6N against an alumina ball. The results showed that the deformed samples have the highest wear rate. Maximum wear rate was obtained for 2% deformed samples. This state can therefore affect the reliability of the material. The wear mechanisms involved were observed by scanning electron microscopy.Voir les détails

Mots clés : SMSS, mechanical properties, deformation, wear, friction

STUDY OF THE THERMAL AND MORPHOLOGICAL PROPERTIES OF SOLID STEEL WASTE

Slags, Characterization, Steel waste, physicochemical properties (2019)
Article de conférence

Slags, by-products of the manufacture of pig iron in blast furnaces of the iron and steel industries. In recent years, the steel industry has put in place several ways of upgrading these materials, but these methods concern recent and homogeneous slags, which are still difficult to apply to ancient slags. These accumulations of non-reusable heterogeneous materials are left behind, and we must understand what impact they can have on their environment in the medium and long term. The main objective of this work is to carry out a study on the use of co-products from the El-Hadjar Annaba Algerian steel plant (blast furnace slags). This involves physico-chemical characterisation of appropriate methods, including optical microscopy, X-ray diffraction, infrared beam transformed spectrometry and thermal analysis. The diffractograms obtained on the slag samples characterise the vitreous phase and some light lines representing the crystallised compounds. Powder analysis by IR infrared spectrometry, Spectrum shows identified bands, such as Al-O, Ca-O, and Si-O bonds These results were justified by X-ray diffraction (XRD) and thermal analysis (ATG and DSC).Voir les détails

Mots clés : Slags, characterization, Steel waste, physicochemical properties

Effect of microstructure and precipitation phenomena on theMechanical behaviour of AA6061-T6 aluminum alloy weld.

M.HAKEM, S. Lebaili, S. Mathieu, D. Miroud, A. LEBAILI, B. Cheniti (2019)
Article de conférence

In the present study, the effect of microstructure and precipitation phenomenaon the micro hardness of Tungsten Inert Gas (TIG) welded AA6061-T6 aluminum alloyare investigated. The microstructure features showed mainly the grains of aluminum solid solution with the presence of some precipitates at the grain boundaries. Scanning electron microscope micrographs exhibited the presence of Fe-based intermetallic and B-equilibrium precipitates throughout a-Al grains. In the heat-affected zone (HAZ), the dissolution, over-aged and coalescence of precipitates are observed; their hardening effects disappear and a decrease in strength and hardness are noticed.Voir les détails

Mots clés : Aluminum alloys, TIG welding, precipitates, microstructure

Prediction of the fracture of a non-alloy steel calm to aluminum by simulation in direct tensile test

S. Achouri, R. Benchouieb, O.Ghalloudj, M. BOUREBIA, S. Medahhe, A. Oualabbas (2019)
Article de conférence

The mechano-probabilistic study is based on a set of statistical models allowing the understanding of the modes of fracture materials. In our case, we used the model of BORDET which has the distinction of being slightly complex and thin compared to other statistical models. This model takes into account the maximum principal stress at each moment and not the maximum main stress during loading. The Bordet model requires the knowledge of parameters intrinsic to the studied material (unalloyed steel killed with aluminum centered cubic structure). This work allows the optimization of the BORDET probabilistic model parameters; It defines a probability of rupture of the test pieces tested for the estimation of the durability of product. In our case the simulation test is done by quasi-dynamic tensile test for the extension to the cyclic tests.Voir les détails

Mots clés : modes of fracture, Mechano-probabilistic, BORDET