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.

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.

Phase Field Simulation of Grain Growth with Particle Pinning

2016 ◽  
Vol 724 ◽  
pp. 8-11
Author(s):  
Chun Yu Teng ◽  
Yun Fu ◽  
Zhan Yong Ren ◽  
Yong Hong Li ◽  
Yun Wang ◽  
...  
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Grain Boundary ◽  
Grain Growth ◽  
Phase Field ◽  
Particle Number ◽  
Boundary Energy ◽  
Service Condition ◽  
Second Phase ◽  
Pinning Effect

The properties of alloys depend on its microstructure, such as the size of grains. In general, the balanced mechanical properties of alloys can be obtained with small grain size. While the grain size of alloys may increases under heat treatment, thermal mechanical processing and service condition of high temperature, i.e., the grain growth is inevitable. The effort of most research is to control the rate of grain growth and avoid abnormal grain growth. For example, pinning the grain boundary and reduce its mobility with the second phase particles in order to prevent grain growth. Therefore, the properties of the alloys will not decreases dramatically and the structure retains a high degree of integrity. The details of grain growth with particle pinning were investigated by phase field simulations in the present paper. It is found that, with the same size of pinning particles, the pinning effect increases with the increases of the pinning particle number. With the same pinning particle number, the pinning effect increases with the increases of pinning particle size. Under the same total volume of pinning particles while different particle size and number, the pinning effect is complicated and it will be discussed in details. The pinning effect decreases with the increases of grain boundary energy. These findings could shed light on the understanding of the grain growth kinetics with particle pinning.

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.

Effect of Ca on Grain Size and Toughness in CGHAZ of C-Mn Steel

2011 ◽  
Vol 291-294 ◽  
pp. 886-889
Author(s):  
Kun Ning Jia
Keyword(s):  
Grain Size ◽  
Grain Boundary ◽  
Grain Growth ◽  
Second Phase ◽  
Pinning Force ◽  
Second Phase Particles ◽  
Impact Experiment ◽  
Strong Pinning ◽  
Mn Steel

Through adding enough calcium to C-Mn steel, the second phase particles of CaO can be found in C-Mn steel. The microstructure, the grain size and the toughness of CGHAZ in micro-calcium steel and no micro-calcium steel were studied by TEM, SEM and series impact experiment. The research shows that: the second phase particles CaO in micro-calcium steel have strong pinning force to grain boundary of CGHAZ; the second phase particles can retard grain growth in the course of welding in micro-calcium steel, fining grain at CGHAZ and improving the toughness of CGHAZ in micro-calcium steel.

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.

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