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Effect of process variables on formation of dynamic strain induced ultrafine ferrite during hot torsion testing

Hurley, Peter and Hodgson, Peter 2001, Effect of process variables on formation of dynamic strain induced ultrafine ferrite during hot torsion testing, Materials Science and Technology, vol. 17, no. 11, pp. 1360-1368.

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Title Effect of process variables on formation of dynamic strain induced ultrafine ferrite during hot torsion testing
Author(s) Hurley, Peter
Hodgson, Peter
Journal name Materials Science and Technology
Volume number 17
Issue number 11
Start page 1360
End page 1368
Publisher Institute of Metals
Place of publication London, England
Publication date 2001-11
ISSN 0267-0836
1743-2847
Summary Ultrafine grain sizes were produced using hot torsion testing of a 0.11C-1.68Mn-0.20Si (wt-%) steel, with ultrafine ferrite (<1 µm) nucleating intragranularly during testing by dynamic strain induced transformation. A systematic study was made of the effect of isothermal deformation temperature, strain level, strain rate, and accelerated cooling during deformation on the formation of ultrafine ferrite by this process. Decreasing the isothermal testing temperature below the Ae3 temperature led to a greater driving force for ferrite nucleation and thus more extensive nucleation during testing; the formation of Widmanstätten ferrite prior to, or early during, deformation imposed a lower temperature limit. Increasing the strain above that where ferrite first began 0.8 at 675C and a strain rate of 3 s¯1 increased the intragranular nucleation of ferrite. Strain rate appeared to have little effect on the amount of ferrite formed. However, slower strain rates led to extensive polygonisation of the ferrite formed because more time was available for ferrite recovery. Accelerated cooling during deformation followed by air cooling to room temperature led to a uniform microstructure consisting of very fine ferrite grains and fine spherical carbides located in the grain boundaries regions. Air cooling after isothermal testing led to carbide bands and a larger ferrite grain size.
Notes Reproduced with the specific permission of the copyright owner.
Language eng
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2001, IoM Communications Ltd.
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008450

Document type: Journal Article
Collections: School of Engineering and Technology
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.