This end-chilled mold was used in the study of 6061 and 6082 alloys used in metal casting.
• The iron phases in 6000 series wrought materials should be controlled by metalcasters through freezing rate, iron content and thermal dissolution of the phases during heat treatment solutioning.
• 6082 alloy showed a more rapid deterioration in ductility with slower cooling rates than did 6061. • 6061 alloy was controlled more
The effects of heat treatment in producing wrought-type alloys in near- net-shape casting were studied using this suspension link casting.
• Six hours at 1,058F (570C) suffi- ciently converted the microstructure of 6061 alloy when cast to shape. 6082 alloy benefitted from a homoge- nizing treatment of 12 hours. Beyond 12 hours, both alloys deteriorated. • Iron levels from 0.1-0.15% were
easily via microstructure and high mechanical properties, particularly through heat treating.
• The casting process used with these alloys can have an effect on the properties achievable, but no process was singled out as best.
• Composition and alloy treatment with grain refiners and strontium can limit hot tearing in alloys like 6061.
equally effective in the 6061 alloy; 6082 tended to degrade with an increased iron level.
54 | MODERN CASTING May 2011
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