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The Effect of Cooling Rate, and Cool Deformation Through Strain-Induced Transformation, on Microstructural Evolution and Mechanical Properties of Microalloyed Steels

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Abstract

In this article, a detailed study was conducted to evaluate the microstructural evolution and mechanical properties of microalloyed steels processed by thermomechanical schedules incorporating cool deformation. Cool deformation was incorporated into a full scale simulation of hot rolling, and the effect of prior austenite conditioning on the cool deformability of microalloyed steels was investigated. As well, the effect of varying cooling rate, from the end of the finishing stage to the cool deformation temperature, 673 K (400 °C), on mechanical properties and microstructural evolution was studied. Transmission electron microscopy (TEM) analysis, in particular for Nb containing steels, was also conducted for the precipitation evaluation. Results show that cool deformation greatly improves the strength of microalloyed steels. Of the several mechanisms identified, such as work hardening, precipitation, grain refinement, and strain-induced transformation (SIT) of retained austenite, SIT was proposed, for the first time in microalloyed steels, to be a significant factor for strengthening due to the deformation in ferrite. Results also show that the effect of precipitation in ferrite for the Nb bearing steels is greatly overshadowed by SIT at room temperature.

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Acknowledgments

Financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC), McGill University, Evraz Inc. NA, and The Canadian Neutron Beam Centre at Chalk River is gratefully acknowledged. As well, Dr. David Liu’s useful help with the TEM work is gratefully acknowledged. The authors also thank Drs. Jessica Calvo and Ahmad Rezaeian for their valuable help and useful discussion.

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Author notes

  1. S. H. Mousavi Anijdan (Ph.D., Postdoctoral Researcher)

    Present address: Novelis Global Technology Centre (NGTC), Kingston, ON, K7K 5L9, Canada

Authors and Affiliations

  1. Department of Mining and Materials Engineering, McGill University, Montreal, PQ, H3A 2B2, Canada

    S. H. Mousavi Anijdan (Ph.D., Postdoctoral Researcher) & Steve Yue (Professor of Materials Engineering and Chair)

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  1. S. H. Mousavi Anijdan
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  2. Steve Yue
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Correspondence to S. H. Mousavi Anijdan.

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Manuscript submitted January 1, 2011

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Mousavi Anijdan, S.H., Yue, S. The Effect of Cooling Rate, and Cool Deformation Through Strain-Induced Transformation, on Microstructural Evolution and Mechanical Properties of Microalloyed Steels. Metall Mater Trans A 43, 1140–1162 (2012). https://doi.org/10.1007/s11661-011-0958-7

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