Abstract
Heat treatments were performed using an isothermal bainitic transformation (IBT) temperature compatible with continuous hot-dip galvanizing on two high Al–low Si transformation induced plasticity (TRIP)-assisted steels. Both steels had 0.2 wt pct C and 1.5 wt pct Mn; one had 1.5 wt pct Al and the other had 1 wt pct Al and 0.5 wt pct Si. Two different intercritical annealing (IA) temperatures were used, resulting in intercritical microstructures of 50 pct ferrite (α)-50 pct austenite (γ) and 65 pct α-35 pct γ. Using the IBT temperature of 465 °C, five IBT times were tested: 4, 30, 60, 90, and 120 seconds. Increasing the IBT time resulted in a decrease in the ultimate tensile strength (UTS) and an increase in the uniform elongation, yield strength, and yield point elongation. The uniform elongation was higher when using the 50 pct α-50 pct γ IA temperature when compared to the 65 pct α-35 pct γ IA temperature. The best combinations of strength and ductility and their corresponding heat treatments were as follows: a tensile strength of 895 MPa and uniform elongation of 0.26 for the 1.5 pct Al TRIP steel at the 50 pct γ IA temperature and 90-second IBT time; a tensile strength of 880 MPa and uniform elongation of 0.27 for the 1.5 pct Al TRIP steel at the 50 pct γ IA temperature and 120-second IBT time; and a tensile strength of 1009 MPa and uniform elongation of 0.22 for the 1 pct Al-0.5 pct Si TRIP steel at the 50 pct γ IA temperature and 120-second IBT time.
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Acknowledgments
The authors thank U.S. Steel Canada, Xstrata Zinc Canada, the Natural Sciences and Engineering Research Council of Canada (NSERC), and the members of the McMaster Steel Research Centre for support of this research through their funding of the NSERC/U.S. Steel Canada/Xstrata Zinc Industrial Research Chair. The authors also thank the following people from McMaster University (Hamilton, ON, Canada): Jason Lavallée (galvanizing simulator technologist), Jim Britten (XRD), Steve Koprich (SEM), and Rob Lemmon (tensile testing). The authors also thank the Academic User Access Facility (AUAF) program of the Materials Technology Laboratory (Ottawa, ON, Canada) for the fabrication of the TRIP steels used in this work.
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Manuscript submitted August 21, 2009.
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Bellhouse, E., McDermid, J. Effect of Continuous Galvanizing Heat Treatments on the Microstructure and Mechanical Properties of High Al-Low Si Transformation Induced Plasticity Steels. Metall Mater Trans A 41, 1460–1473 (2010). https://doi.org/10.1007/s11661-010-0185-7
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DOI: https://doi.org/10.1007/s11661-010-0185-7