Semi-quantitative predictions of hot tearing and cold cracking in aluminum DC casting using numerical process simulator

2012 ◽  
Vol 33 ◽  
pp. 012068 ◽  
Author(s):  
T Subroto ◽  
A Miroux ◽  
D Mortensen ◽  
M M'Hamdi ◽  
D G Eskin ◽  
...  
Keyword(s):  
Hot Tearing ◽  
Cold Cracking ◽  
Numerical Process ◽  
Dc Casting ◽  
Process Simulator

Micro-Mechanical Model of Hot Tearing at Triple Junctions in DC Casting

2002 ◽  
Vol 396-402 ◽  
pp. 179-184 ◽  
Author(s):  
Suyitno ◽  
W.H. Kool ◽  
Laurens Katgerman
Keyword(s):  
Mechanical Model ◽  
Hot Tearing ◽  
Triple Junctions ◽  
Dc Casting

scholarly journals Hot-tearing of Al-Li alloys in DC casting.

1993 ◽  
Vol 43 (11) ◽  
pp. 600-605 ◽  
Author(s):  
Kinya OHARA ◽  
Osamu WAKASAKI ◽  
Masayasu TOYOSHIMA ◽  
Tomoya OHZONO
Keyword(s):  
Hot Tearing ◽  
Dc Casting

Analysis of the impact of macrosegregation on hot tearing conditions during DC casting of aluminium alloys

2009 ◽  
Vol 22 (1-4) ◽  
pp. 90-93 ◽  
Author(s):  
K. Ellingsen ◽  
M. M'Hamdi ◽  
D. Mortensen ◽  
H. G. Fjær
Keyword(s):  
Aluminium Alloys ◽  
Hot Tearing ◽  
Dc Casting ◽  
The Impact

Application of a Criterion for Cold Cracking to Casting High Strength Aluminium Alloys

2010 ◽  
Vol 654-656 ◽  
pp. 1432-1435 ◽  
Author(s):  
Mehdi Lalpoor ◽  
Dmitry G. Eskin ◽  
Hallvard Gustav Fjær ◽  
Andreas Ten Cate ◽  
Nick Ontijt ◽  
...  
Keyword(s):  
Thermal Stresses ◽  
Stress Component ◽  
Research Work ◽  
High Strength ◽  
Crack Size ◽  
Cold Cracking ◽  
Critical Crack ◽  
Dc Casting ◽  
Constitutive Parameters ◽  
Cast Condition

Direct chill (DC) casting of high strength 7xxx series aluminum alloys is difficult mainly due to solidification cracking (hot cracks) and solid state cracking (cold cracks). Poor thermal properties along with extreme brittleness in the as-cast condition make DC-casting of such alloys a challenging process. Therefore, a criterion that can predict the catastrophic failure and cold cracking of the ingots would be highly beneficial to the aluminum industry. The already established criteria are dealing with the maximum principal stress component in the ingot and the plane strain fracture toughness (KIc) of the alloy under discussion. In this research work such a criterion was applied to a typical 7xxx series alloy which is highly prone to cold cracking. The mechanical properties, constitutive parameters, as well as the KIc values of the alloy were determined experimentally in the genuine as-cast condition and used as input data for the finite element package ALSIM5. Thermomechanical simulations were run for billets of various diameters and the state of residual thermal stresses was determined. Following the contour maps of the critical crack size gained from the model, the casting conditions were optimized to produce a crack-free billet.

DC Casting of Large Sized Ingot of a High Strength 7xxx Alloy under the Influence of Electromagnetic Field

2013 ◽  
Vol 765 ◽  
pp. 165-169 ◽  
Author(s):  
Jian Zhong Cui ◽  
Hai Tao Zhang ◽  
Yu Bo Zuo
Keyword(s):  
Electromagnetic Field ◽  
Flow Direction ◽  
New Technology ◽  
Low Frequency ◽  
High Strength ◽  
Direct Chill ◽  
Hot Tearing ◽  
Electromagnetic Casting ◽  
Dc Casting ◽  
7Xxx Alloy

Hot tearing and cold cracks are major defects during direct chill (DC) casting of large sized ingots of high strength aluminium alloys. In order to solve these problems, based on a low frequency electromagnetic casting (LFEC) process, a new technology, electromagnetic casting with the application of an air blade (EMA) was developed. In the present work, this new technology was used to prepare large sized AA7055 aluminium alloy ingots and the effects of the low frequency electromagnetic field and the air blade on macro-physical fields, microstructure and cracking are studied by numerical and experimental methods. The results show that applying an electromagnetic field can modify the flow direction, increase the velocity of melt flow and homogenize the distribution of temperature in the sump. Applying an air blade can homogenize the distribution of temperature and decrease the stress and strain in the solidified ingot. Furthermore, the microstructure of the ingot is refined remarkably and cracking is eliminated by simultaneously applying the electromagnetic field and the air blade during DC casting.

Diffusion of Ion-Implanted Tin in Gallium Arsenide

1989 ◽  
Vol 163 ◽  
Author(s):  
E.L. Allen ◽  
M.D. Deal ◽  
J.D. Plummer
Keyword(s):  
Gallium Arsenide ◽  
Electron Concentration ◽  
Depth Profiles ◽  
Numerical Process ◽  
Background Doping ◽  
Process Simulator ◽  
Ion Implanted

AbstractThe diffusion of ion-implanted tin in gallium arsenide was investigated as a function of temperature, dose and background doping. The chemical depth profiles were determined using SIMS and the carrier profiles were determined by CV Etch Profiling. The data was fit using a numerical process simulator, SUPREM 3.5. Sn diffusivity was found to depend on the square of the electron concentration. Sn and Ge were found to have relatively high diffusivities when implanted, while Si diffused very little.

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