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Solid-state recycling for machined chips of iron by hot extrusion and annealing

Published online by Cambridge University Press:  03 March 2011

Yasumasa Chino ,
Hajime Iwasaki  and
Mamoru Mabuchi
Yasumasa Chino
Affiliation:
Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology, Moriyama-ku, Nagoya 463-8560, Japan
Hajime Iwasaki*
Affiliation:
Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology, Moriyama-ku, Nagoya 463-8560, Japan
Mamoru Mabuchi
Affiliation:
Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology, Moriyama-ku, Nagoya 463-8560, Japan
*
a) Address all correspondence to this author. e-mail: y-chino@aist.go.jp
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Abstract

Solid-state recycling for machined chips of pure iron by hot extrusion at 823 K and annealing at 1073–1273 K was carried out. The as-extruded solid recycled specimen without annealing was fractured prior to yielding at room temperature. However, high ductility was recovered by annealing at 1073–1273 K. This is because the oxides at the interface of the machined chips dispersed in grain by annealing. The annealed solid recycled specimens showed higher yield stress than the annealed virgin extruded specimens. Grain refinement for the solid recycled specimens was enhanced by the high dislocation density in the machined chips, resulting in higher strength in the recycled specimens. Thus, the solid-state recycling is a low energy upgrade recycle process.

Keywords

ExtrusionDiffusionMechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 5 , May 2004 , pp. 1524 - 1530
Copyright
Copyright © Materials Research Society 2004

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