Utilization of the finite element and Monte Carlo model for simulating the recrystallization of inhomogeneous deformation of copper

Azarnush

et al. 2010

MSF

There are many works on annealing process of SPDed bulk metals but there are limited works on annealing process of SPDed sheets. Therefore, in this study the annealing response after constrained groove pressing (CGP) of low carbon steel sheets has been investigated. These sheets are subjected to severe plastic deformation at room temperature by CGP method up to three passes. Nano-structured low carbon steel sheets produced by severe plastic deformation are annealed at temperature range of 100 to 600 °C for 20 min. The microstructural changes after deformation and annealing are studied by optical microscopy. The effects of CGP strain and annealing temperature on microstructure, strength and hardness evolutions of the nano-scale grained low carbon steel are examined. The results show that annealing phenomena can effectively improve the elongation of process sheets with preserving the hardness and mechanical strength. Also, a thermal stability of microstructure can be observed with annealing at a temperature range of 375–425 °C and 400 °C is achieved as an optimum annealing temperature. Microstructure after post-annealing at temperatures of higher than 600 °C shows abnormal grain growth.

Section: Resultscontrasting

confidence: 94%

Effect of Post Annealing Treatment on Nano-Structured Low Carbon Steel Sheets Processed by Constrained Groove Pressing

Khodabakhshi

Azarnush

et al. 2010

MSF

“…It should be mentioned that in the lattice the nuclei are given orientation ranging from 49 to Q s = 64 [30,33,34].…”

Section: Computer Modeling Of Microstructure Inhomogeneitymentioning

confidence: 99%

“…forty rows of 200 sites. Since, in recrystallization of copper the nucleation phenomenon is site saturated [4], thus in this research for nucleation modeling, the site saturated model developed by the present author et al [33,34] is utilized:…”

Section: Computer Modeling Of Microstructure Inhomogeneitymentioning

confidence: 99%

Modeling the effect of redundant strain factor on the microstructure inhomogeneity of drawn and annealed wire

J Computer-Aided Mater Des

2007

In assessing of the effect of redundant strain factor on the microstructure inhomogeneity of the drawn wire after annealing, the Upper Bound Model based on spherical velocity field and a computer simulation based on Monte Carlo Model are utilized. Using the models, the strain, stored energy due to deformation and grain size distribution of the wires after different deformation and annealing conditions are calculated. From the achieved results the deformation and microstructure inhomogeneity are computed. It is observed that the deformation inhomogeneity as well as microstructure inhomogeneity is increased with increasing the parameter and redundant strain factor. Also, the results show that in the longer annealing time, the lower microstructure inhomogeneity is achieved. Moreover, the results of modeling are compared with the experimental data and a good agreement is obtained between those.

“…Using the stored energy of each region, its nucleus density is calculated utilizing Eq 15, developed by the present author et al (Ref 37,38).…”

Section: Potts Model and Microstructure Simulationmentioning

confidence: 99%

Combination of the Upper Bound and Potts Models for Simulation of Microstructure in Wire Drawing and Annealing Processes

J. of Materi Eng and Perform

2009

For microstructure modeling of copper wire after wire drawing process and annealing, an algorithm based on the Upper Bound Method and Potts Model is developed. In the algorithm, the Upper Bound Method is utilized to calculate the stored energy distribution in the drawn wire and then the stored energy is used in the Potts Model to obtain the grain size distribution of the drawn wire after annealing. The microstructure modeling is carried out at different deformation and annealing conditions. In all of the conditions, the fine and coarse grains are achieved at the surface and center of the wire, respectively. Also, the grain size of the drawn wire after annealing is decreased with increasing die angle and reduction in area. The modeling results are verified by the experimental results and a good agreement is achieved.