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Microstructural model for hot strip rolling of high-strength low-alloy steels

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Abstract

The microstructural evolution during hot-strip rolling has been investigated in four commercial high-strength low-alloy (HSLA) steels and compared to that of a plain, low-carbon steel. The recrystallization rates decrease as the Nb microalloying content increases, leading to an increased potential to accumulate retained strain during the final rolling passes. The final microstructure and properties of the hot band primarily depend on the austenite decomposition and precipitation during run-out table cooling and coiling. A combined transformation-ferrite-grain-size model, which was developed for plain, low-carbon steels, can be applied to HSLA steels with some minor modifications. The effect of rolling under no-recrystallization conditions (controlled rolling) on the transformation kinetics and ferrite grain refinement has been evaluated for the Nb-containing steels. Precipitation of carbides, nitrides, and/or carbonitrides takes place primarily during coiling, and particle coarsening controls the associated strengthening effect. The microstructural model has been verified by comparison to structures produced in industrial coil samples.

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Authors and Affiliations

  1. the Centre for Metallurgical Process Engineering, The University of British Columbia, V6T 1Z4, Vancouver, BC, Canada

    M. Militzer (Assistant Professor), E. B. Hawbolt (Professor Emeritus) & T. R. Meadowcroft (Professor)

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  1. M. Militzer
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Militzer, M., Hawbolt, E.B. & Meadowcroft, T.R. Microstructural model for hot strip rolling of high-strength low-alloy steels. Metall Mater Trans A 31, 1247–1259 (2000). https://doi.org/10.1007/s11661-000-0120-4

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