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The Effect of Multiple Deformations on the Formation of Ultrafine Grained Steels

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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.

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Acknowledgments

This research has been supported by grants through the Australian Research Council. The authors are grateful to NEDO, Japan, the Ferrous Nano Metal Project, and Professor Setsuo Takaki, Kushu University, Japan, for supply of the Ni-30Fe model alloy. Hodgson acknowledges the provision of a Federation Fellowship by the Australian Research Council. Beladi also acknowledges Deakin University for providing a research scholarship for this work.

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Authors and Affiliations

  1. Centre for Material and Fibre Innovation, Deakin University, Geelong, Victoria, Australia, 3217

    Hossein Beladi (Postdoctoral Research Fellow), Georgina L. Kelly (Research Fellow) & Peter D. Hodgson (Professor, and ARC Federation Fellow)

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  1. Hossein Beladi
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  2. Georgina L. Kelly
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  3. Peter D. Hodgson
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Correspondence to Hossein Beladi.

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Manuscript submitted September 4, 2006.

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Beladi, H., Kelly, G.L. & Hodgson, P.D. The Effect of Multiple Deformations on the Formation of Ultrafine Grained Steels. Metall Mater Trans A 38, 450–463 (2007). https://doi.org/10.1007/s11661-006-9080-7

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