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The effect of controlled cooling after hot rolling on the mechanical properties of a commercial high carbon steel wire rod
, Article Materials and Design ; Volume 24, Issue 6 , 2003 , Pages 415-421 ; 02641275 (ISSN) ; Karimi Taheri, A ; Sharif University of Technology
Elsevier Ltd
2003
Abstract
In this research, the effects of different cooling conditions after hot rolling in Stelmor conveyor line on the mechanical properties of a commercial high carbon steel wire rod are investigated. By opening and closing the lids, turning on and off the fans in Stelmor system, an air patenting process is performed on a commercial high carbon steel to improve its mechanical properties and ductility. The wire rods produced in different cooling conditions are investigated by tensile test, metallography and image analyzing. The optimum cooling condition required for high strength and ductility are evaluated. Moreover, the relationships between yield stress, UTS and fracture stress, and...
Experimental Investigation of the Effect of Almen Intensity and Coverage on Microstructure and Fatigue Behavior of High Carbon Steel Subjected to Severe Shot Peening
, M.Sc. Thesis Sharif University of Technology ; Farrahi, Gholamhossein (Supervisor)
Abstract
In most cases, material failures occur on their surfaces, such as fatigue fracture, wear and friction, fretting fatigue and corrosion, so surface modification is one of the most effective techniques to improve the strength of materials. Correction of near surface grain size to nanoscale is one of the effective ways to improve the strength, fatigue life, toughness and etc. With increasing evidences of novel properties in nanostructured materials, it is reasonable to propose to achieve surface modification by the generation of nanostructured surface layer so that the overall properties and behaviors of the material are significantly improved.By means of surface severe plastic deformation, the...
Plastic Deformation Analysis of High Carbon Steel Wire During Flat Rolling
, M.Sc. Thesis Sharif University of Technology ; Karimi Taheri, Ali (Supervisor) ; Kazeminezhad, Mohsen (Supervisor)
Abstract
In this research plastic deformation analysis of high carbon steel wire in one and more pass wire flat rolling process using the finite element method (FEM) has been investigated. The effects of changing rolling pass number, length of wire, mechanical property of roll, rolling speed and friction between roll and wire in calculated results have been studied and with the main process parameters are compared. Then, the damage and failure of wire and that’s steady state cross-section is examined by model of Johnson cook damage criterion (JC). The results suggested that reduction in height of the wire affects the rolling process parameters such as strain, damage and the cross-sectional geometry...
Investigation into dynamic strain aging behaviour in high carbon steel
, Article Ironmaking and Steelmaking ; Volume 37, Issue 2 , Jul , 2010 , Pages 155-160 ; 03019233 (ISSN) ; Sadeghi, A. R ; Akhgar, J. M ; Serajzadeh, S ; Sharif University of Technology
2010
Abstract
In this work, the phenomenon of dynamic strain aging in a high carbon steel is studied and different initial microstructures including fine and coarse pearlite structures are considered. Tensile tests at different temperatures and strain rates are performed to evaluate the occurrence of dynamic strain aging and mechanical properties as well as to calculate apparent activation energies for onset and termination of dynamic strain aging. The results show that dynamic strain aging occurs for both microstructures while the initial microstructures alters the activation energies for appearance and termination of this phenomenon. The microstructural studies illustrate that a combination of cementite...
A study on microstructural changes and mechanical properties in steel rods subjected to uniform and non-uniform cooling layout using a finite element analysis
, Article Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture ; Volume 222, Issue 12 , 2008 , Pages 1639-1649 ; 09544054 (ISSN) ; Serajzadeh, S ; Sharif University of Technology
2008
Abstract
This paper presents a mathematical model for prediction of temperature history, final microstructures, and transformation kinetics in steel rods subjected to non-uniform cooling conditions. To achieve this goal, a mathematical model based on two-dimensional finite element method is developed to solve the governing heat conduction equation with non-uniform boundary conditions. The additivity rule is coupled with the finite element analysis to assess the kinetics of austenite decomposition during continuous cooling. The effect of decarburization during heating stage is also considered in the model employing Fick's second equation. To verify the predictions, time-temperature histories during...