Microstructure Evolution During Spray Rolling and Heat Treatment of 2124 Al

Conference · Fri Sep 01 04:00:00 EDT 2006

OSTI ID:911655

McHugh, K M; Lin, Y; Zhou, Y; Johnson, S B; Delplanque, J P; Lavernia, E J

Spray rolling is a strip casting technology that combines elements of spray forming and twin-roll casting. It consists of atomizing molten metal with a high velocity inert gas, quenching the resultant droplets in flight, and directing the spray between mill rolls. In-flight convection heat transfer from atomized droplets and conduction heat transfer at the rolls rapidly move an alloy’s latent heat. Hot deformation of the semi-solid material in the rolls results in fully consolidated, rapidly-solidified product. While similar in many ways to twin-roll casting, spray rolling is able to process a broader range of alloys and operates at a higher production rate. A laboratory-scale strip caster has been constructed at INL and used to evaluate the interplay of processing parameters and strip quality while producing strips up to 200 mm wide and 1.6 – 6.4 mm thick. Plans are underway to scale to 600 mm width and demonstrate steady-state operation. As-spray-rolled strip is characterized by a flat, uniformly thick profile with minimal porosity or segregation. This paper examines how processing parameters influence the microstructure transformations that take place during spray rolling and post-deposition heat treatment of 2124 Al.

• Research Organization: Idaho National Laboratory (INL)
• Sponsoring Organization: DOE - EE
• DOE Contract Number: AC07-99ID13727
• OSTI ID: 911655
• Report Number(s): INL/CON-06-11193
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ATOMIZATION
CASTING
CONVECTION
DEFORMATION
DEPOSITION
HEAT TRANSFER
HEAT TREATMENTS
MICROSTRUCTURE
POROSITY
PROCESSING
PRODUCTION
QUENCHING
ROLLING
SEGREGATION
TRANSFORMATIONS
VELOCITY
aluminum
process developmemt