فهرست مقالات Equal Channel Angular Pressing

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  1 - 3D finite element study of temperature variations during equal channel angular pressing
  Mehdi Shaban Ghazani A. vajd B. Mosadeg
  Equal channel angular pressing is the most promising method of severe plastic deformation with the capability of producing ultrafine grained materials. These materials exhibit improved mechanical and physical properties compared with their coarse grained counter parts.T چکیده کامل

  Equal channel angular pressing is the most promising method of severe plastic deformation with the capability of producing ultrafine grained materials. These materials exhibit improved mechanical and physical properties compared with their coarse grained counter parts.The temperature variation in the sample during ECA-pressing is a key factor determining the final microstructure and mechanical properties of processed material. Therefore, in the present study, temperature rise and temperature distribution in the sample was studied with the aid of finite element simulation. In this regard, the effect of friction, ram speed and material type on the amount of temperature rise and also the temperature profile in the sample was investigated. Results of FEM simulations showed good consistency with the temperature data acquired in the experimental work. In addition, it was shown that the sample temperature AND THE AMOUNT OF TEMPERATURE RISE increases with the increase of friction; ram speed and work hardening coefficient of the material. پرونده مقاله
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  2 - Investigation of Effective Parameters on the Surface Temperature Gradient under Equal Channel Angular Pressing Process of AA2017
  Farshid Ahmadi Hadi Mansouri Elyas Sarami Foroushani
  In recent years, processes known as severe plastic deformation (SPD) have been devised to create fine-grained materials. Among these processes, equal channel angular pressing (ECAP) has been more favored than other methods due to its high efficiency, simplicity, and ind چکیده کامل

  In recent years, processes known as severe plastic deformation (SPD) have been devised to create fine-grained materials. Among these processes, equal channel angular pressing (ECAP) has been more favored than other methods due to its high efficiency, simplicity, and industrial production potential. This study aimed to investigate the sample temperature gradient during the ECAP process. For this purpose, a Taguchi experiment with influencing factors on AA2017 alloy was designed and a relationship was obtained to predict sample surface temperature. Experiments were carried out using grease, graphite powder, and MoS2 lubricants, along with routes A, BC, BA, and C. The surface temperature of the sample was measured using a laser thermometer. A finite element model was compared with the experimental conditions, and the simulation and experimental results of surface temperature were verified with an error of about 1.9%. In experiments, it was found that speed and lubricant had a significant effect on sample temperature during the process. The simulation results showed that decreasing the die angle resulted in a significant increase in temperature. Following the validation of the FEM model, the temperature gradient and distribution in the middle of the sample, wherein practical experiments could not be measured, were also investigated. پرونده مقاله
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  3 - Evolution of Texture and Grain Size during Equal Channel Angular Extrusion of Pure Copper and 6012 Aluminum
  Mohammad Hossein Shahsavari Farshid Ahmadi
  Among different SPD techniques, Equal channel Angular Pressing has attracted the most attentions, because of applying large strain to solid bulk materials. In this research, ECAP process up to 6 passes was carried out on a pure copper and a 6012 Al-Mg-Si alloy with BC r چکیده کامل

  Among different SPD techniques, Equal channel Angular Pressing has attracted the most attentions, because of applying large strain to solid bulk materials. In this research, ECAP process up to 6 passes was carried out on a pure copper and a 6012 Al-Mg-Si alloy with BC route in ECAP dies with Φ=120 and Ψ=20 and diameter of 20and 10 millimeter respectively. Moreover, X-ray diffraction (XRD) system was utilized to investigate changes of the crystallite size and texture variations using for calculating texture parameters and comparing the X-ray diffraction patterns of annealed samples and Ecaped samples. Dominant texture of (111) in annealed aluminum altered to a mixture plane. Also, dominant texture of annealed copper of (111) and (200) shifted to another plane. The opposite of copper samples, changes in diameter and length of aluminum specimens had no effect on diffraction pattern of them. The microstructures were evaluated by OM. The results showed that grain size of annealed aluminum after six passes of ECAP decreased by 75%. پرونده مقاله
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  4 - Parameter Analysis and optimization of equal channel angular pressing extrusion for titanium alloy using Taguchi design of experiments method
  حسن خادمی زاده علی افتخاری حسام الدین ابطحی فروشانی
  In this paper the influence of different parameters on equal channel angular pressing (EADAP) of titanium alloy is investigated. In the first step the most important parameters are selected, and then a table of experiments is designed using Taguchi method. After designi چکیده کامل

  In this paper the influence of different parameters on equal channel angular pressing (EADAP) of titanium alloy is investigated. In the first step the most important parameters are selected, and then a table of experiments is designed using Taguchi method. After designing the table of experiments, all of the experiments are simulated using Abacus software and the results are optimized using Taguchi method. The results shows that the optimum levels for ECAP method between the implemented experiments of titanium are 120 degrees for die channel, ambient temperature and 2 passes. پرونده مقاله