Abstract
Laser ultrasonics is a noncontacting technique with which the attenuation of ultrasonic signals can be measured and related to the grain size of the investigated material. In the present article, a laser-ultrasonic grain-size measurement technique previously developed for various C-Mn and microalloyed steels has been extended to examine austenite recrystallization and subsequent grain growth following hot deformation. The ultrasonic measurements were conducted on a low-carbon (0.05 wt pct) steel that contains Mn, Mo, and Nb as the three main alloying/microalloying elements. The grain-size data measured by ultrasonic experiments were analyzed to quantify the effect of deformation conditions on the evolution of recrystallized grain size and subsequent grain growth. A significant effect of deformation temperature, applied strain, and initial grain size on the grain-size evolution was observed, while strain rate had a negligible effect. Phenomenological modeling approaches were employed to describe the recrystallized grain-size and grain-growth behavior of the present steel.
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Acknowledgments
The financial support received from the Natural Science and Engineering Research Council of Canada (NSERC) and Dofasco, Inc. is acknowledged with gratitude. The authors thank Dofasco for providing the material for this research. The authors also acknowledge Dr. Silvio E. Kruger for helpful discussions related to laser-ultrasonic experimentation.
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Reproduced by permission of the National Research Council of Canada.
Manuscript submitted August 2, 2007.
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Sarkar, S., Moreau, A., Militzer, M. et al. Evolution of Austenite Recrystallization and Grain Growth Using Laser Ultrasonics. Metall Mater Trans A 39, 897–907 (2008). https://doi.org/10.1007/s11661-007-9461-6
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DOI: https://doi.org/10.1007/s11661-007-9461-6