A Model for Recovery Kinetics of Aluminum after Large Strain

2012 ◽  
Vol 715-716 ◽  
pp. 374-379 ◽  
Author(s):  
Tian Bo Yu ◽  
Niels Hansen
Keyword(s):  
Present Model ◽  
Large Strain ◽  
True Strain ◽  
Commercial Purity ◽  
Recovery Model ◽  
Commercial Purity Aluminum ◽  
Kinetics Of

A model is suggested to analyze recovery kinetics of heavily deformed aluminum. The model is based on the hardness of isothermal annealed samples before recrystallization takes place, and it can be extrapolated to longer annealing times to factor out the recrystallization component of the hardness for conditions where recovery and recrystallization overlap. The model is applied to the isothermal recovery at temperatures between 140 and 220°C of commercial purity aluminum deformed to true strain 5.5. EBSD measurements have been carried out to detect the onset of discontinuous recrystallization. Furthermore, comparison between the present model and a similar recently developed recovery model is made, and the result is discussed.

Microstructural Coarsening during Annealing of Cold Rolled Aluminum

2004 ◽  
Vol 467-470 ◽  
pp. 209-216 ◽  
Author(s):  
Q. Xing ◽  
X. Huang ◽  
Niels Hansen
Keyword(s):  
Lamellar Structure ◽  
True Strain ◽  
Rolling Texture ◽  
Recrystallization Temperature ◽  
Commercial Purity ◽  
Microstructural Coarsening ◽  
Transmission Electron ◽  
Rolled Aluminum ◽  
Cold Rolled ◽  
Commercial Purity Aluminum

The microstructural evolution during annealing below the recrystallization temperature of a commercial purity aluminum (99wt.% purity) cold rolled to a true strain of 2 has been investigated by transmission electron microscopy concentrating on microstructural and orientational aspects. The deformation microstructure was a typical lamellar structure with extended lamellar boundaries, GNBs (geometrical necessary boundaries), and short interconnecting boundaries, IDBs (incidental dislocation boundaries). The microstructure was divided into regions representing typical rolling texture orientations and regions of other orientations. During annealing the structure coarsened towards an equiaxed structure and it was observed that this coarsening was significantly slower in regions of rolling texture orientations than in regions of other orientations. This difference was discussed based on the characteristics of the deformation structure.

3D reconstruction of microstructure in a commercial purity aluminum

2006 ◽  
Vol 55 (1) ◽  
pp. 75-80 ◽  
Author(s):  
A. Brahme ◽  
M.H. Alvi ◽  
D. Saylor ◽  
J. Fridy ◽  
A.D. Rollett
Keyword(s):  
3D Reconstruction ◽  
Commercial Purity ◽  
Commercial Purity Aluminum

Hardness recovery of cold worked commercial-purity aluminum

1975 ◽  
Vol 14 (1) ◽  
pp. 55-58
Author(s):  
T.A. El-Bassyouni ◽  
A.N. Abd El-Azim ◽  
A.E. El-Mehairy
Keyword(s):  
Commercial Purity ◽  
Cold Worked ◽  
Commercial Purity Aluminum

scholarly journals Existing State of Hydrogen in Electrochemically Charged Commercial-Purity Aluminum and Its Effects on Tensile Properties

2011 ◽  
Vol 52 (9) ◽  
pp. 1741-1747 ◽  
Author(s):  
Hiroshi Suzuki ◽  
Daisuke Kobayashi ◽  
Nobuko Hanada ◽  
Kenichi Takai ◽  
Yukito Hagihara
Keyword(s):  
Tensile Properties ◽  
Commercial Purity ◽  
Commercial Purity Aluminum

scholarly journals Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5116
Author(s):  
Ivo Schindler ◽  
Rostislav Kawulok ◽  
Petr Opěla ◽  
Petr Kawulok ◽  
Stanislav Rusz ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Deformation Temperature ◽  
True Strain ◽  
Austenitization Temperature ◽  
Diffusion Controlled ◽  
Significant Acceleration ◽  
Wide Range ◽  
Mean Grain Size ◽  
Cct Diagrams ◽  
Kinetics Of

The combined effect of deformation temperature and strain value on the continuous cooling transformation (CCT) diagram of low-alloy steel with 0.23% C, 1.17% Mn, 0.79% Ni, 0.44% Cr, and 0.22% Mo was studied. The deformation temperature (identical to the austenitization temperature) was in the range suitable for the wire rolling mill. The applied compressive deformation corresponded to the true strain values in an unusually wide range. Based on the dilatometric tests and metallographic analyses, a total of five different CCT diagrams were constructed. Pre-deformation corresponding to the true strain of 0.35 or even 1.0 had no clear effect on the austenite decomposition kinetics at the austenitization temperature of 880 °C. During the long-lasting cooling, recrystallization and probably coarsening of the new austenitic grains occurred, which almost eliminated the influence of pre-deformation on the temperatures of the diffusion-controlled phase transformations. Decreasing the deformation temperature to 830 °C led to the significant acceleration of the austenite → ferrite and austenite → pearlite transformations due to the applied strain of 1.0 only in the region of the cooling rate between 3 and 35 °C·s−1. The kinetics of the bainitic or martensitic transformation remained practically unaffected by the pre-deformation. The acceleration of the diffusion-controlled phase transformations resulted from the formation of an austenitic microstructure with a mean grain size of about 4 µm. As the analysis of the stress–strain curves showed, the grain refinement was carried out by dynamic and metadynamic recrystallization. At low cooling rates, the effect of plastic deformation on the kinetics of phase transformations was indistinct.

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