Effects of alloy composition and casting speed on structure formation and hot tearing during direct-chill casting of Al-Cu alloys

2004 ◽  
Vol 35 (11) ◽  
pp. 3551-3561 ◽  
Author(s):  
Suyitno ◽  
V. I. Savran ◽  
L. Katgerman ◽  
D. G. Eskin
Keyword(s):  
Structure Formation ◽  
Casting Speed ◽  
Alloy Composition ◽  
Direct Chill ◽  
Hot Tearing ◽  
Direct Chill Casting ◽  
Chill Casting ◽  
Cu Alloys

The Effect of Casting Speed on Sump Shape and Ingot Surface of HDC Casting 7075 Aluminum Alloy Ingot

2011 ◽  
Vol 189-193 ◽  
pp. 3785-3788 ◽  
Author(s):  
Qing Feng Zhu ◽  
Zhi Hao Zhao ◽  
Xiang Jie Wang ◽  
Jian Zhong Cui
Keyword(s):  
Aluminum Alloy ◽  
Surface Quality ◽  
Casting Speed ◽  
Direct Chill ◽  
Liquid Pool ◽  
Ingot Surface ◽  
Direct Chill Casting ◽  
7075 Aluminum Alloy ◽  
Chill Casting ◽  
Alloy Ingot

7075 aluminum alloy ingot with the diameter of 100 mm has been produced by horizontal direct chill casting in different casting speed. The effect of casting speed on the sump profile and the ingot surface quality was studied by sump profile observation. It was found that increasing the casting speed results in the deepening of the liquid pool, the adding of segregation knots and the reducing of cold shouts in the ingot surface. It is also found that the depth of the liquid pool is directly proportional to the casting speed and the squared radius of the ingot.

Effect of Structure on Hot Tearing Properties of Aluminum Alloys

2007 ◽  
Vol 561-565 ◽  
pp. 995-998 ◽  
Author(s):  
Dmitry G. Eskin ◽  
Laurens Katgerman
Keyword(s):  
Aluminum Alloys ◽  
Solid Phase ◽  
High Strength ◽  
Direct Chill ◽  
Hot Tearing ◽  
Direct Chill Casting ◽  
Small Scale ◽  
Thermal Contraction ◽  
Chill Casting ◽  
High Strength Aluminum Alloys

Hot tearing is a significant problem upon direct-chill casting of high-strength aluminum alloys. The occurrence of hot cracks is related to the thermal contraction of the solid phase and to the lack of feeding by the liquid phase during solidification. It has been identified that structure features such as grain size and amount of nonequilibrium eutectics influence both phenomena involved in hot tearing. Experimental and computer-simulation results are presented for a range of model and commercial aluminum alloys. The results are obtained both during special small-scale experiments and during industrial-scale direct-chill casting. It is shown that grain refinement reduces hot tearing susceptibility of aluminum alloys through the related decrease of the temperature of thermal contraction onset and increased permeability of the mushy zone. The effects of process parameters on hot tearing are also discussed.

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