scholarly journals Asymptotic Behavior in Grain Growth

1994 ◽  
Vol 343 ◽  
Author(s):  
David T. Wu
Keyword(s):  
Distribution Function ◽  
Asymptotic Behavior ◽  
Grain Growth ◽  
Lower Order ◽  
Growth Behavior ◽  
Experimental Results ◽  
Growth Exponent ◽  
Diffusion Term ◽  
Drift Term ◽  
Grain Growth Behavior

ABSTRACTHillert’s model of grain growth consists of a drift term in size space that leads asymptotically to a distribution function and a growth exponent not often observed. Later theories introduce a diffusion term that is either assumed to dominate the drift term or a correction to it. This paper shows that the lower order drift term alone determines asymptotic grain growth behavior. A possible conclusion is that experimental results may need to be reinterpreted.

Grain Growth Kinetics of Cobalt-Doped SnO2 by Varying Nb2O5 Content

2007 ◽  
Vol 534-536 ◽  
pp. 529-532 ◽  
Author(s):  
Dong Gyu Chang ◽  
Joon Hyung Lee ◽  
Jeong Joo Kim
Keyword(s):  
Grain Growth ◽  
Boundary Segregation ◽  
Growth Behavior ◽  
Grain Boundary Segregation ◽  
Growth Exponent ◽  
Space Charges ◽  
Grain Growth Kinetics ◽  
Grain Growth Behavior ◽  
Kinetics Of ◽  
Co Doped

SnO2 ceramics were co-doped with the aliovalent ions of CoO and Nb2O5 and the grain growth behavior of the SnO2 was investigated. When only CoO was doped, the grain growth exponent of SnO2 was 3. As the amount of Nb2O5 increased, the exponent changed from 3 to 2 when 0.505 mol% of Nb2O5 was added. The further addition of Nb2O5 changed the exponent from 2 to 3. When Nb2O5 content was 0.505 mol%, of which the grain growth exponent was 2, it is believed that an iso-electric point is formed without grain boundary segregation, since the respective space charges, generated by Nb5+ and Co3+ might compensate each other.

scholarly journals Effect of Cold-Deformation on Austenite Grain Growth Behavior in Solution-Treated Low Alloy Steel

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1004 ◽  
Author(s):  
Xianguang Zhang ◽  
Kiyotaka Matsuura ◽  
Munekazu Ohno
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Grain Growth ◽  
Cold Deformation ◽  
Growth Behavior ◽  
Low Alloy Steel ◽  
Solution Treated ◽  
Austenite Grain ◽  
Grain Growth Behavior ◽  
Austenite Grain Growth

The occurrence of abnormal grain growth (AGG) of austenite during annealing is a serious problem in steels with carbide and/or nitride particles, which should be avoided from a viewpoint of mechanical properties. The effects of cold deformation prior to annealing on the occurrence of AGG have been investigated. It was found that the temperature range of the occurrence of AGG is shifted toward a low temperature region by cold deformation, and that the shift increases with the increase of the reduction ratio. The lowered AGG occurrence temperature is attributed to the fine and near-equilibrium AlN particles that are precipitated in the cold-deformed steel, which is readily dissolved during annealing. In contrast, coarse and non-equilibrium AlN particles precipitated in the undeformed steel, which is resistant to dissolution during annealing.

Austenitic Grain Growth Behavior during Austenization in an Aluminum-Alloyed 5% Cr-Mo-V Steel

2016 ◽  
Vol 87 (11) ◽  
pp. 1450-1460 ◽  
Author(s):  
Sha-Sha Li ◽  
Yao-Hui Liu ◽  
Yu-Lai Song ◽  
Ling-Nan Kong ◽  
Tuan-Jie Li ◽  
...  
Keyword(s):  
Grain Growth ◽  
Growth Behavior ◽  
Grain Growth Behavior
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