Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/85028
Title: Grain size and workpiece dimension effects on material flow in an open-die micro-forging/extrusion process
Authors: Ghassemali, Ehsan
Tan, Ming-Jen
Wah, Chua Beng
Jarfors, Anders E.W.
Lim, S.C.V.
Keywords: Subgrain
Size effect
Dislocation cells
Microforming
Dead metal zone
Issue Date: 2013
Source: Ghassemali, E., Tan, M.-J., Wah, C. B., Jarfors, A. E. W., & Lim, S. C. V. (2013). Grain size and workpiece dimension effects on material flow in an open-die micro-forging/extrusion process. Materials Science and Engineering: A, 582, 379-388.
Series/Report no.: Materials Science and Engineering: A
Abstract: The interactive effect of grain size and specimen dimensions on the material flow and microstructural evolution was studied in a progressive open-die microforming process. Particular interest was paid on the effect of the number of grains over the initial specimen thickness, on the evolution of the dead metal zone (DMZ) in the final micro-component's microstructure. Such a DMZ is deemed unfavorable for mechanical properties of the pin. Interestingly, experimental results revealed that the DMZ can be removed at the pin surface by increasing the initial grain size. This behavior was attributed to the role of the strain gradient on the deformation. In the aspects of the forming load and dimensional measurements of the final parts, there were no significant size-effects observed in this process. This is because the neutral plane, which demarcates the two directions of material flow in the open-die forging/extrusion process, determines the amount of material flow towards the die orifice, regardless of the initial grain size.
URI: https://hdl.handle.net/10356/85028
http://hdl.handle.net/10220/39614
ISSN: 0921-5093
DOI: http://dx.doi.org/10.1016/j.msea.2013.06.023
Rights: © 2013 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Materials Science and Engineering: A, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.msea.2013.06.023].
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Appears in Collections:MAE Journal Articles
SIMTech Journal Articles

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