The influence of temperature and preheating time in extrudate quality of solid-state recycled aluminum
Recovering waste metal without the need for remelting in solid-state recycling of metal chips can create green production. The overall process of solid-state recycling should be run at the lowest possible cost to remain competitive. High temperature and prolonged preheating time for billet’s homogen...
| Main Authors: | , , , |
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| Format: | Article |
| Published: |
Springer-Verlag London
2016
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| Subjects: | |
| Online Access: | DOI:10.1007/s00170-016-9521-4 DOI:10.1007/s00170-016-9521-4 |
| Summary: | Recovering waste metal without the need for
remelting in solid-state recycling of metal chips can create
green production. The overall process of solid-state recycling
should be run at the lowest possible cost to remain competitive.
High temperature and prolonged preheating time for billet’s
homogenization in hot extrusion to consolidate the chips
conflicts with the aim of minimizing energy usage. Therefore,
optimizing the effect of preheating temperature and time prior
to hot extrusion is important. This study investigates the effects
of preheating temperature and preheating time on the
extrudates’ quality. Milling chips of AA6061 were cold
compacted and hot extruded through a flat-face die using
preheating temperatures of 400, 500, and 550 °C for 1–6 h
of preheating time. The mechanical and physical properties
and microstructure of the extruded profiles were compared.
The results revealed that higher acceptable strength and ductility
were obtained at 500 °C with 2 h of preheating time. On
top of that, temperature increase was the main criterion that
results in the highest tensile strength; nevertheless, it was subjected
to trade-off in ductility. The profile extruded at 500 and
550 °C had gained a close tensile strength. The study includes
the prediction of the chip’s welding quality through the damage
evolution on the extrudate’s structure. It was implemented
with the help of DEFORMTM 3D finite element method
(FEM) software, and the normalized Cockcroft and Latham
(C & L) fracture criterion was chosen. The results of the simulations
were compared and validated by the experimental
results. |
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