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The effect of multiple deformations on the formation of ultrafine grained steels

Beladi, Hossein, Kelly, Georgina and Hodgson, Peter 2007, The effect of multiple deformations on the formation of ultrafine grained steels, Metallurgical and materials transactions A - physical metallurgy and materials science, vol. 38, no. 3, pp. 450-463, doi: 10.1007/s11661-006-9080-7.

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Title The effect of multiple deformations on the formation of ultrafine grained steels
Author(s) Beladi, Hossein
Kelly, Georgina
Hodgson, Peter
Journal name Metallurgical and materials transactions A - physical metallurgy and materials science
Volume number 38
Issue number 3
Start page 450
End page 463
Publisher Minerals, Metals & Materials Society
Place of publication Warrendale, PA.
Publication date 2007-04-12
ISSN 1073-5623
1543-1940
Summary A C-Mn-Nb-Ti steel was deformed by hot torsion to study ultrafine ferrite formation through dynamic strain-induced transformation (DSIT) in conjunction with air cooling. A systematic study was carried out first to evaluate the effect of deformation temperature and prior austenite grain size on the critical strain for ultrafine ferrite formation (ε C,UFF) through single-pass deformation. Then, multiple deformations in the nonrecrystallization region were used to study the effect of thermomechanical parameters (i.e., strain, deformation temperature, etc.) on ε C,UFF. The multiple deformations in the nonrecrystallization region significantly reduced ε C,UFF, although the total equivalent strain for a given thermomechanical condition was higher than that required in single-pass deformation. The current study on a Ni-30Fe austenitic model alloy revealed that laminar microband structures were the key intragranular defects in the austenite for nucleation of ferrite during the hot torsion test. The microbands were refined and overall misorientation angle distribution increased with a decrease in the deformation temperature for a given thermomechanical processing condition. For nonisothermal multipass deformation, there was some contribution to the formation of high-angle microband boundaries from strains at higher temperature, although the strains were not completely additive.
Language eng
DOI 10.1007/s11661-006-9080-7
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Minerals, Metals & Materials Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007077

Document type: Journal Article
Collections: Centre for Material and Fibre Innovation
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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.