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Formation of Banded Microstructures with Rapid Intercritical Annealing of Cold-Rolled Sheet Steel

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Abstract

The effects of heating rate in the range of 0.3 to 693 °C/s on transformations during intercritical annealing of a cold-rolled 0.12C-1.4Mn-0.02Nb steel with either a ferrite-pearlite or ferrite-spheroidized carbide microstructure were evaluated. Heating rates were selected to impart different predicted degrees of ferrite recrystallization present at the onset of austenite formation. Rapid heating minimized ferrite recrystallization with both prior microstructures and minimized pearlite spheroidization in the ferrite-pearlite condition, and austenite formation occurred preferentially in recovered ferrite regions as opposed to along recrystallized ferrite boundaries. Martensite was evenly distributed in slowly heated steels because austenite formed on recrystallized, equiaxed, ferrite boundaries. With rapid heating, austenite formed in directionally oriented recovered ferrite, which increased the degree of banding. The greatest degree of banding was found with intermediate heating rates leading to partial recrystallization, because austenite formed preferentially in the remaining recovered ferrite, which was located in bands along the rolling direction. Ferrite-spheroidized carbide microstructures had somewhat reduced martensite banding when compared to the ferrite-pearlite condition, where elongated pearlite enhanced banded austenite leading to banding in transformed microstructures.

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Acknowledgment

The authors gratefully acknowledge the support of the Advanced Steel Processing and Products Research Center, Colorado School of Mines.

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Authors and Affiliations

  1. Colorado School of Mines, Golden, CO, 80401, USA

    Larrin S. Thomas & David K. Matlock

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  1. Larrin S. Thomas
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  2. David K. Matlock
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Correspondence to Larrin S. Thomas.

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Manuscript submitted January 4, 2018.

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Thomas, L.S., Matlock, D.K. Formation of Banded Microstructures with Rapid Intercritical Annealing of Cold-Rolled Sheet Steel. Metall Mater Trans A 49, 4456–4473 (2018). https://doi.org/10.1007/s11661-018-4742-9

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