scholarly journals Mechanism of Orientation Selectivity During Grain Growth of Secondary Recrystallization in Fe-3%Si Alloy

1999 ◽  
Vol 32 (1-4) ◽  
pp. 137-151 ◽  
Author(s):  
Y. Ushigami ◽  
T. Kubota ◽  
N. Takahashi
Keyword(s):  
Grain Growth ◽  
Secondary Recrystallization ◽  
Orientation Distribution ◽  
Recrystallization Temperature ◽  
Second Phase ◽  
Average Deviation ◽  
Pinning Effect ◽  
Second Phase Particles ◽  
The Matrix ◽  
The Ideal

Selective growth of {110}〈001〉 grains in the temperature gradient annealing has been studied in Fe–3%Si alloy. As grains grow, the average deviation angle from the ideal {110}〈001〉 orientation becomes smaller and orientation distribution changes corresponding to that of coincidence grains in the matrix. Secondary recrystallization temperature depends on the orientation of secondary recrystallized grain and sharper {110} 〈001〉 grains grow preferentially at lower temperatures.These phenomena are explained by modified Hillert's model of grain growth. Interfacial energy of coincidence boundary is lower than that of general boundary. Therefore, sharper {110}〈001〉 grains, which have higher frequency of coincidence grains in the primary recrystallized matrix, suffer lower pinning effect from the second phase particles and thus grow preferentially at lower temperatures.

Grain Growth of Polycrystalline AZ31 Mg Alloy Containing Second Phase Particles by Phase Field Simulation

2016 ◽  
Vol 850 ◽  
pp. 307-313
Author(s):  
Yan Wu ◽  
Si Xia ◽  
Bernie Ya Ping Zong
Keyword(s):  
Particle Size ◽  
Grain Growth ◽  
Phase Field ◽  
Phase Field Model ◽  
Free Energy Density ◽  
Critical Value ◽  
Spherical Particles ◽  
Second Phase ◽  
Pinning Effect ◽  
Second Phase Particles

A phase field model has been established to simulate the grain growth of AZ31 magnesium alloy containing spherical particles with different sizes and contents under realistic spatial-temporal scales. The expression term of second phase particles are added into the local free energy density equation, and the simulated results show that the pinning effect of particles on the grain growth is increased when the contents of particles is increasing, which is consistent with the law of Zener pinning. There is a critical particle size to affect the grain growth in the microstructure. If the size of particles is higher than the critical value, the pinning effect of particles for grain growth will be increased with further decreasing the particle size; however the effect goes opposite if the particle size is lower than the critical value.

Evaluation of grain growth exponent by Monte Carlo simulation in polycrystalline materials

2021 ◽  
pp. 2150024
Author(s):  
P. Rajendra ◽  
K. R. Phaneesh ◽  
C. M. Ramesha ◽  
Madeva Nagaral ◽  
V Auradi
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Grain Growth ◽  
Growth Exponent ◽  
Polycrystalline Materials ◽  
Second Phase ◽  
2D Simulation ◽  
Second Phase Particles ◽  
The Matrix ◽  
Grain Growth Kinetics

In metallurgy, the microstructure study is very important to evaluate the properties and performances of a material. The Monte Carlo method is applied in so many fields of Engineering Science and it is a very effective method to examine the topology of the computer-simulated structures and exactly resembles the static behavior of the atoms. The effective 2D simulation was performed to understand the grain growth kinetics, under the influence of second phase particles (impurities) is a base to control the microstructure. The matrix size and [Formula: see text]-states are optimized. The grain growth exponent was investigated in a polycrystalline material using the [Formula: see text]-state Potts model under the Monte Carlo simulation. The effect of particles present within the belly of grains and pinning on the grain boundaries are observed. The mean grain size under second phase particles obeys the square root dependency.

Secondary Recrystallization in Grain-Oriented Silicon Steel

2004 ◽  
Vol 467-470 ◽  
pp. 853-862 ◽  
Author(s):  
Yoshiyuki Ushigami ◽  
Tomoji Kumano ◽  
Tsutomu Haratani ◽  
Shuichi Nakamura ◽  
Shigeto Takebayashi ◽  
...  
Keyword(s):  
Boundary Energy ◽  
Secondary Recrystallization ◽  
Silicon Steel ◽  
Second Phase ◽  
In Situ Observation ◽  
Pinning Force ◽  
Goss Texture ◽  
Second Phase Particles ◽  
The Matrix ◽  
Grain Growth Behavior

Mechanism of Goss secondary recrystallization in grain-oriented silicon steel has been investigated by temperature gradient annealing and by in situ observation utilizing synchrotron x-ray topography. The results support the selective growth theory. Migration of Goss grains is controlled by second phase particles (inhibitor) and sharper Goss grains, which have higher frequency of CSL boundaries to the matrix, start to grow preferentially while the other matrix grains are stagnated by inhibitor. CSL boundaries are supposed to have lower grain boundary energy, thus suffer lower pinning force from the inhibitor and start to migrate at higher inhibition level. Based on this model, we have made a computer simulation and have found that this model successfully depicts the important features of secondary recrystallization; grain growth behavior of secondary grains, secondary grain size and sharpness of Goss texture.

Influence of MnS Particles inside Grains on the Boundary Migration before Secondary Recrystallization of Grain Oriented Electrical Steels

2010 ◽  
Vol 160 ◽  
pp. 247-250 ◽  
Author(s):  
W. Mao ◽  
Y. Li ◽  
W. Guo ◽  
Z. An
Keyword(s):  
Particle Density ◽  
Boundary Migration ◽  
Secondary Recrystallization ◽  
Annealing Treatment ◽  
Second Phase ◽  
Electrical Steels ◽  
Second Phase Particles ◽  
Dislocation Densities ◽  
The Matrix ◽  
Hot Band

The precipitation behaviors of fine MnS and other second phase particles in hot band, decarburized sheet and 875 oC annealed sheet before secondary recrystallization of conventional grain oriented electrical steel were investigated. It is indicated that the small particles as inhibitors would dissolve in the matrix during cold rolling, and precipitate again in following annealing treatment. The particles inside grains would keep retarding the grain boundary migration. It was found that the particle densities in all grains were quite different before initiation of secondary recrystallization and might be grain orientation dependent, in which Goss grains showed higher particle density. It is expected that the grain boundaries would move towards the grains with lower particle density more easily and promote the rapid growth of Goss grains. The reason for difference of particle densities in different grains is quite complicated. The influence of possible different dislocation densities and the different precipitation behaviors of second phase particles are mentioned.

Modeling of Grain Growth with Second Phase Particle Pinning by Cellular Automata Method

2011 ◽  
Vol 239-242 ◽  
pp. 1474-1477
Author(s):  
Hong Zhong Li ◽  
Xiao Fei Ma
Keyword(s):  
Cellular Automata ◽  
Grain Growth ◽  
Phase Particle ◽  
Second Phase ◽  
Growth Simulation ◽  
Pinning Effect ◽  
Second Phase Particles ◽  
Simulation Results

A model for grain growth simulation, in the presence of the second phase particles, is established with the help of a Cellular Automata method. The effect of the time when the second phase particles are introduced on grain growth is simulated. The simulation results show that the second phase particles inhibit the grain growth and the earlier the particles are introduced, the better the pinning effect.

Influence of the Second Phase Particle’s Size Distribution on Grain Growth Based on Computer Simulation

2011 ◽  
Vol 239-242 ◽  
pp. 930-933
Author(s):  
Xiao Fei Ma
Keyword(s):  
Grain Boundary ◽  
Size Distribution ◽  
Grain Growth ◽  
Theoretical Models ◽  
Second Phase ◽  
Pinning Effect ◽  
Second Phase Particles ◽  
Average Grain Size ◽  
Relationship Of ◽  
The Relationship

Based on cellular automata, a model of simulating grain growth is established to study the effects of the second phase particle’s size distribution on grain growth. The simulation results show that the second phase particles in the matix pin the grain boundary and then inhibit the grain growth. Different size distributions of the second phase particles have different pinning effect on the grain boundary, and the relationship of average grain size for the material with the second phase particles is RLognormal＞RUniform＞RNormal. The correlative laws obtained from the simulation is in accordance with the theoretical models.

Phase Field Model for Grain Growth with Second-Phase Particles of Stick Shape

2013 ◽  
Vol 741 ◽  
pp. 3-6 ◽  
Author(s):  
Wen Quan Zhou ◽  
Ying Juna Gao ◽  
Yao Liu ◽  
Zhi Rong Luo ◽  
Chuang Gao Huang
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Phase Field ◽  
Influence Factor ◽  
Phase Field Model ◽  
Phase Field Method ◽  
Second Phase ◽  
Triple Junctions ◽  
Pinning Effect ◽  
Second Phase Particles

The phase field method was applied to study the effect of second-phase particles (SPP) with different geometric orientations and shapes on grain growth. The results show that, in the grain growth process, most of the spherical second-phase particles located at triple junctions, while the stick SPPs located at the grain boundaries along the grain boundary. The second-phase particles are of the strong pinning effect on grain boundary and the limiting grain radius can be expressed by Zener relations. In the condition of the second-phase particles area fraction and size remaining the same, the stick SPPs are of more effective pinning on grain growth than that for spherical SPPs, and the orientation of disk second-phase particles is also an influence factor for pinning effect. Stick second-phase particles with multiple orientations can make a better pining effect than those with only one orientation.

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