Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 41A, Issue 6, Pages 1460-1473Publisher
SPRINGER
DOI: 10.1007/s11661-010-0185-7
Keywords
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Funding
- U.S. Steel Canada, Xstrata Zinc Canada
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- McMaster Steel Research Centre
- NSERC/U.S. Steel Canada/Xstrata Zinc Industrial Research Chair
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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 (alpha)-50 pct austenite (gamma) and 65 pct alpha-35 pct gamma. Using the IBT temperature of 465 A degrees 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 alpha-50 pct gamma IA temperature when compared to the 65 pct alpha-35 pct gamma 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 gamma 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 gamma 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 gamma IA temperature and 120-second IBT time.
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