material AA332
casting temperature 750C
mould - metal and carbon graphite
Dear Mr. Mohd Fizam Zainon,
The following methods can reduce the columnar structure.
I think, it will help you.
Regards
Siva Prasad M
Hi Mohd Fizam Zainon ,
Grain structure can be obtained by controlling the alloy composition, cooling capacity at the metal/mold interface, melt convection and nuclei density present in the melt.
The popular technique is to go for addition of grain refiners into aluminum and its alloys.
Widely used grain refiners are master alloys of titanium, or of titanium and boron, in aluminum.
Or Recent technique of DC casting with intensive melt shearing, for the production. Equiaxed grain structure in the Al billets can be attributed to enhanced heterogeneous nucleation and growth under conditions with reduced temperature.
Equiaxed growth: Intensive melt shearing leads to a uniform temperature and enhanced mass transport. The melt temperature measured was few K below the alloy liquidus which provides a unique condition for growth with low temperature gradient and high growth velocity.
Grain refinement: Intensive melt shearing leads to formation of oxides films. Then disperses the naturally occurring oxides films into fine and well distributed individual oxide particles. The number density increase can be as high as three orders of magnitude. Therefore, grain refinement in DC casting with intensive melt shearing can be attributed to enhanced heterogeneous nucleation.
Ref:
Melt Conditioned Direct Chill (MC-DC) Casting of Al Alloy, Trans Indian Inst Met (April 2013) 66(2):117–121.
Aluminum and Aluminum Alloys, Joseph R. Davis, ASM International, 1993
Aluminum Alloys: Structure and Properties, L. F. Mondolfo Elsevier, 2013
Effects and mechanisms of grain refinement in aluminium alloys, Bull. Mater. Sci., Vol. 24, No. 4, August 2001, pp. 345–353.
Microstructural refinement of Al–10.2%Si alloy by intensive shearing, Materials Letters Volume 64, Issue 6, 31 March 2010, Pages 671–673
Grain Refinement of Aluminum Casting Alloys, Paper 07-067(02), AFS Transactions 2007 © American Foundry Society, Schaumburg, IL USA
Dear bro.
solidification structure can be control of the casting process and mixing during solidification, often by electromagnetic stirrers. Ultrasound
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