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    Study of mechanisms of cold roll welding of aluminium alloy to steel strip

    , Article Materials Science and Technology ; Volume 20, Issue 8 , 2004 , Pages 1064-1068 ; 02670836 (ISSN) Manesh, H. D ; Taheri, A. K ; Sharif University of Technology
    Maney Publishing  2004
    The mechanisms of cold roll welding of aluminium alloy to steel strip has been assessed based on a study of interfacial behaviour at deformations of up to 60% together with the surface characteristics of peeled Al clad steel strip. The proposed mechanisms are applicable where the contact surfaces are degreased and then scratch brushed before the rolling deformation. According to this mechanisms the scratch-brushed layers are fractured shortly after entering the roll gap at a reduction of approximately 10%, which is about the threshold deformation for the roll bonding of aluminium to steel. The transfer cracks formed then become wider so that the distance between each coherent block increases... 

    Influence of deformation path change on static strain aging of cold rolled steel strip

    , Article International Journal of Advanced Manufacturing Technology ; Volume 61, Issue 9-12 , 2012 , Pages 901-909 ; 02683768 (ISSN) Koohbor, B ; Serajzadeh, S
    Effect of deformation path change on the static strain aging of low carbon steel was studied in this work. In the first stage, strip samples were subjected to cold rolling processes under different paths with the same total reduction in thickness while the deformation behaviors of the rolled samples were also evaluated using a mathematical analysis. Then, cold-rolled strips were aged in room temperature up to 45 days while hardness and tensile evaluations were performed to assess the mechanical properties of the as-rolled and the aged samples. Finally, the influence of rolling pass schedule on the subsequent strain aging phenomenon was investigated by means of the experimental results and... 

    The effect of annealing treatment on mechanical properties of aluminum clad steel sheet

    , Article Materials and Design ; Volume 24, Issue 8 , 2003 , Pages 617-622 ; 02641275 (ISSN) Danesh Manesh, H ; Karimi Taheri, A ; Sharif University of Technology
    Elsevier Ltd  2003
    In this paper, the effects of annealing temperature and time on mechanical properties and bond strength of aluminum clad steel sheet are evaluated. The results indicate that there exist an optimum annealing temperature and time for achieving a suitable formability and bonding strength between the clad layer and base metal. At this annealing time and temperature, the brittle intermetallic layer at the intimate interface of the layers is minimized. © 2003 Elsevier Ltd. All rights reserved  

    Effect of cold rolling reduction and intercritical annealing temperature on the bulk texture of two TRIP-aided steel sheets

    , Article Journal of Materials Processing Technology ; Volume 203, Issue 1-3 , 2008 , Pages 293-300 ; 09240136 (ISSN) Emadoddin, E ; Akbarzadeh, A ; Daneshi, Gh ; Sharif University of Technology
    High strength TRIP-aided steel sheets with high formability and better ductility are of industrial interest. Texture control and retained austenite characterization are considered as the main factors with respect to the formability and ductility. Processing parameter such as initial conditions of hot rolling, cold rolling to final size of sheet, intercritical annealing after cold rolling and subsequent isothermal heat treatment to achieve TRIP specification in product, affect bulk texture of sheets. Moreover, chemical composition of steel should be noted especially because it can change the intensity of orientation and final macro texture of sheet. In this work, the effect of cold rolling... 

    Effect of electropulsing on microstructure and hardness of cold-rolled low carbon steel

    , Article Journal of Materials Research and Technology ; Volume 8, Issue 3 , 2019 , Pages 3114-3125 ; 22387854 (ISSN) Alaghmand Fard, R ; Kazeminezhad, M ; Sharif University of Technology
    Elsevier Editora Ltda  2019
    The application of electropulsing treatment (EPT) is studied on the microstructure and hardness of cold-rolled low carbon steel. The effects of electrical pulses on the grain refinement, precipitate size evolution and hardness are investigated. It is found that applying electrical pulse decreases the grain and precipitate size and increases the hardness in the early stages of electropulsing, but the grain and precipitate size is increased and the hardness is decreased by continuing electropulsing. Also, the effect of electropulsing treatment variables as well as treated time and number of periods are discussed. It is demonstrated that increasing treated time can accelerate achieving maximum... 

    Prediction of effect of thermo-mechanical parameters on mechanical properties and anisotropy of aluminum alloy AA3004 using artificial neural network

    , Article Materials and Design ; Volume 28, Issue 5 , 2007 , Pages 1678-1684 ; 02613069 (ISSN) Forouzan, S ; Akbarzadeh, A ; Sharif University of Technology
    Elsevier Ltd  2007
    An artificial neural network model, using a back-propagation learning algorithm is utilized, to predict the yield stress, elongation, ultimate tension stress, over(R, -) and {divides}ΔR{divides} during hot rolling, cold rolling and annealing of AA3004 aluminum alloy. Input nodes were chosen as the ratio of initial to final thicknesses, reduction, preheating time and temperature, finish rolling temperature and the final annealing temperature. The maximum error for predicted values was 6.35%, the average of absolute relative error was 0.57% and the RMS was 0.00998. It was found that the mechanical properties and anisotropy of AA3004 alloy sheets can be predicted by this approach. © 2006... 

    An Investigation into the Al-6wt%Mg work Hardening Behavior after Cold Rolling

    , M.Sc. Thesis Sharif University of Technology Abdollahzadeh, Amin (Author) ; Kazeminezhad, Mohsen (Supervisor)
    Al-6wt%Mg alloy has been enormously exploited in aerospace industry. Since for production of this alloy in the form of sheets of different thickness, the cold rolling process is used, thus to understand the final mechanical properties of the rolled alloy products, their work hardening should be examined. Also, one of the important phenomena that occurs in cold state of the alloy is dynamic strain-aging (DSA), which can cause serrations in realistic stress-strain curve. The aforementioned issue is discussed in the current study. Therefore, the work-hardening values for the mentioned alloy during and after rolling is determined, and then compared with the experimental studies. The results of... 

    Prediction of Strain Field in Strip and Work-Roll During Cold Rolling of a Low Carbon Steel

    , M.Sc. Thesis Sharif University of Technology Koohbor, Behrad (Author) ; Serajzadeh, Siamak (Supervisor)
    In this research, distribution of stress, strain and temperature fields in the strip and workroll were determined during steady state cold rolling process. To do this, first an initial guess based on the approach proposed by Hill for the velocity field was taken and accordingly, the real velocity distribution and then the strain rate and stress fields in the strip were calculated. Then, using the obtained stress and strain rate fields, the deformation power was determined and used as a boundary condition for solving the thermal behavior of the strip. By considering the Streamline Upwind Petrov-Galerkin method and solving the finite element relations, the temperature distribution within the... 

    Simulation of recrystallization and martensite revision in 304L austenitic stainless steel after multi-pass rolling processes

    , Article Multiscale and Multidisciplinary Modeling, Experiments and Design ; Volume 3, Issue 4 , 2020 , Pages 227-244 Alavi, P ; Serajzadeh, S ; Sharif University of Technology
    Springer Science and Business Media B.V  2020
    In this work, non-isothermal annealing of cold-rolled 304L austenitic stainless steel was studied at temperatures ranging between 400 and 800 °C. In the first place, a dual-phase structure containing work-hardened austenite and strain-induced martensite was produced by means of multi-pass plate rolling, and then, the deformed steel was subjected to annealing heat treatments. To determine the distribution of stored strain energy in the rolling operations, an elastic–plastic finite-element modeling was conducted. Afterwards, an artificial neural network technique was coupled with the thermal-cellular automata model for prediction of martensite reversion, temperature history, and... 

    Cold-rolling strain hardening effect on the microstructure, serration-flow behaviour and dislocation density of friction stir welded AA5083

    , Article Metals ; Volume 10, Issue 1 , 2020 Sajuri, Z ; Selamat, N. F. M ; Baghdadi, A. H ; Rajabi, A ; Omar, M. Z ; Kokabi, A. H ; Syarif, J ; Sharif University of Technology
    MDPI AG  2020
    5083 aluminium (Al) alloy materials have extensive structural applications in transportation industries because of their high strength-to-weight ratio and corrosion resistance. However, under conventional fusion weldings, these materials are limited by their porosity, hot cracking, and distortion. Herein, friction stir welding (FSW) was performed to join a similar AA5083 alloy. A post-weld cold-rolling (PWCR) process was applied on joint samples at different thickness-reduction percentages (i.e., 10%, 20%, and 40%) to identify the effect of strain hardening on the microstructure and mechanical properties of the friction-stir-welded joint of AA5083 while considering the serration-flow... 

    A study of glycine-based dithiocarbamates as effective corrosion inhibitors for cold rolled carbon steel in HCl solutions

    , Article Surfaces and Interfaces ; Volume 21 , 2020 Zeinali Nikoo, S ; Shockravi, A ; Mokarami Ghartavol, H ; Ziyaei Halimehjani, A ; Ostadrahimi, M ; Mirhosseini, S. M ; Behzadi, H ; Ghorbani, M ; Sharif University of Technology
    Elsevier B.V  2020
    The corrosion inhibition of glycine-based dithiocarbamates with benzyl (BDTC) and propyl (PDTC) groups were investigated for cold rolled carbon steel (CRS) in 0.5 M HCl, indicating that the compounds as mixed type inhibitors significantly reduced the corrosion rate of the CRS due to the formation of a stable protective film on the metal surface. As confirmed by ATR-FTIR, SEM, AFM, XPS and theoretical studies, chemically adsorbed BDTC molecule is a better corrosion inhibitor with higher corrosion efficiency of about 98% at room temperature and a better thermal stability attributed to the Fe-S and Fe-N bindings, and in addition, to the presence of the benzene ring in the molecular structure. ©... 

    Effect of intercritical annealing on retained austenite characterization in textured TRIP-assisted steel sheet

    , Article Materials Characterization ; Volume 57, Issue 4-5 , 2006 , Pages 408-413 ; 10445803 (ISSN) Emadoddin, E ; Akbarzadeh, A ; Daneshi, Gh ; Sharif University of Technology
    Optimization of high strength and high formability of multiphase cold rolled sheet TRIP-aided steels is based on the composition and the austempering conditions. The effect of intercritical annealing temperature on the volume fraction and carbon concentration of the retained austenite was investigated in two different TRIP-aided steels. Experimental results show that the optimum annealing temperatures are 860 °C for Al-containing and 810 °C for Si-containing TRIP steels. It was demonstrated that the measurement of retained austenite can be successfully performed for textured TRIP steels by XRD. © 2006 Elsevier Inc. All rights reserved  

    On the influence of rolling path change on static recrystallization behavior of commercial purity aluminum

    , Article International Journal of Material Forming ; Vol. 7, issue. 1 , 2014 , pp. 53-63 ; ISSN: 19606206 Koohbor, B ; Sharif University of Technology
    An examination of the influence of rolling path change on the static recrystallization behavior of commercial purity aluminum was performed in the present work. Aluminum strips were cold rolled to a reduction of 50 % under various rolling sequences, i.e. single-pass, double-pass from one direction and with reverse directions, and were then annealed in 290 °C for different durations, while mechanical evaluations such as hardness and tensile tests were used to study the mechanical response of cold deformed and annealed samples. It was indicated that a variation in the recrystallization kinetics of the cold rolled aluminum strips takes place when the rolling path is altered from single to... 

    Energy absorption mechanism of Alsteel bilayer sheets produced by cold roll welding during wedge tearing

    , Article International Journal of Mechanical Sciences ; Volume 52, Issue 12 , December , 2010 , Pages 1613-1619 ; 00207403 (ISSN) Beygi, R ; Kazeminezhad, M ; Sharif University of Technology
    The behavior of Alsteel bilayer sheets produced by cold roll welding is investigated through the wedge tearing process. It is observed that through tearing the energy absorbed by cold roll welded bilayer sheets is larger than that of non-welded ones, even though all parameters are identical. Also bilayer sheets with low bond strength have the same energy absorbed by non-welded bilayer sheets. By investigating all contributing mechanisms in tearing and mechanical properties of composite layers and developing theoretical equations, it is concluded that bending of sheets through wedge tearing plays a major role in difference of energy absorbed by welded and non-welded bilayer sheets. Moreover,... 

    Processing, microstructure adjustments, and mechanical properties of dual phase steels: a review

    , Article Materials Science and Technology (United Kingdom) ; Volume 37, Issue 6 , June , 2021 , Pages 561-591 ; 02670836 (ISSN) Kalhor, A ; Karimi Taheri, A ; Mirzadeh, H ; Uthaisangsuk, V ; Sharif University of Technology
    Taylor and Francis Ltd  2021
    In this review, effects of initial microstructure before intercritical annealing and processing routes of dual phase (DP) high strength steels are discussed. Prior-applied deformation processes as cold rolling and severe plastic deformation (SPD) including their impacts on mechanical properties of DP steels are described. Influences of heating rate, recrystallization of ferrite, nucleation and grain growth of austenite on the microstructure evolution are also presented. The intercritical annealing and thermomechanical processes of DP steels are comparatively outlined. Furthermore, post-intercritical annealing treatments, i.e., tempering, bake hardening, strain and quench aging are argued.... 

    , M.Sc. Thesis Sharif University of Technology Dehghanpour Baruj, Hamed (Author) ; Kazeminezhad, Mohsen (Supervisor)
    Demand to structural and industrial materials with unique properties lead to produce unorthodox combination of metals. One of the most useful combinations is composites of Aluminum-Steel and this composites is mostly used as a sheet. Due to differences in melting point of two metals, preferred method for welding of this two metals is Cold Roll Bonding. For enhance of mechanical properties of this two metals, preferred methods is Severe Plastic Deformation. By the way, in SPD methods, two method was established for sheets. Accumulative Roll Bonding and Constrained Groove Pressing but ARB method produce multi-layer composites so preferred method to produce bilayer sheets is CGP. In this study,... 

    Correlation between Luder strain and retained austenite in TRIP-assisted cold rolled steel sheets

    , Article Materials Science and Engineering A ; Volume 447, Issue 1-2 , 2007 , Pages 174-179 ; 09215093 (ISSN) Emadoddin, E ; Akbarzadeh, A ; Daneshi, G. H ; Sharif University of Technology
    In developed multiphase high strength, high formability TRIP-aided steel, Luders bands are observed similar to conventional low carbon steels. Retained austenite as the most effective constituent in TRIP steels, is responsible for Luders band formation as well as other properties such as formability, physical and mechanical properties. In the present study, a correlation between the Luders strain and the retained austenite characterization is proposed and verified by experimental evidences of the work carried out on two types of TRIP steel sheets. Intercritical annealing of cold rolled TRIP steels at different temperatures change the volume fraction of the retained austenite as well as the... 

    Effect of thermomechanical parameters on texture of 90-10 brass sheets

    , Article 14th International Conference on Textures of Materials, ICOTOM 14, Leuven, 11 July 2005 through 15 July 2005 ; Volume 495-497, Issue PART 1 , 2005 , Pages 755-760 ; 02555476 (ISSN); 087849975X (ISBN); 9780878499755 (ISBN) Salari, M ; Akbarzadeh, A ; Saffari, M. M ; Sharif University of Technology
    Trans Tech Publications Ltd  2005
    Optimized conditions of hot and cold rolling followed by annealing can result in a balance between recrystallization and rolling textures in order to reduce the planar anisotropy of brass sheets. In this work, the effect of finish rolling temperature, cold reduction and annealing temperature on texture development has been investigated. It is shown that uniform deformation at higher finishing temperature is responsible of formation of a severe Cube and G texture components. In contrast, mechanical twinnings are widely formed at low finishing temperatures. There is also a direct relation between the intensity of Cube component and the amount of cold reduction  

    Effects of cold rolling on the microstructure and mechanical properties of Fe-Ni-Mn-Mo-Ti-Cr maraging steels

    , Article International Journal of Minerals, Metallurgy and Materials ; Volume 18, Issue 5 , 2011 , Pages 557-561 ; 16744799 (ISSN) Mahmudi, A ; Nedjad, S. H ; Behnam, M. M. J ; Sharif University of Technology
    Effects of cold rolling on the microstructure and mechanical properties of Fe-Ni-Mn-Mo-Ti-Cr maraging steels were studied. To investigate the microstructure and mechanical properties, optical microscopy, scanning electron microscopy, X-ray diffraction, tensile test, and hardness test were used. The results show that the solution-annealing treatment in the cold-rolled steel redounds to the formation of submicrocrystalline Fe2 (Mo, Ti) Laves phase particles, which are stable at high temperatures. These secondary Laves phase particles prevent from recrystallization at high temperatures and correspond to semi-brittle fracture in the subsequent aging treatment  

    Computer Simulation of Flat Rolling Process using the Bezier Function

    , M.Sc. Thesis Sharif University of Technology Elyasi, Nahid (Author) ; Karimi Taheri, Ali (Supervisor)
    In this project, in order to model the flat rolling problems, an analytical method based on Bezier functions has been presented. To this goal, using the Bezier functions, the velocity field of the flat rolling has been stablished and the volume constancy condition and velocity boundary conditions have been considered in calculations. Using the achieved velocity field, the strain rate and strain fields has been determined. Then, with derived fields, power, pressure, and force of the deformation in flat-rolled billets from different materials such as copper, aluminium and steel have been calculated. To verify the accuracy of the results, the rolling process has been carried out on the...