Metall. Res. Technol.
Volume 118, Number 4, 2021
|Number of page(s)||10|
|Published online||01 July 2021|
Significant impact of intercritical annealing temperature on microstructure and mechanical properties of Al substituted Si dual phase steel under ultra-rapid heating
School of Material Science & Engineering, Shenyang Ligong University,
110159, PR China
2Department of Metallurgical, Materials and Biomedical Engineering and Center for Structural and Functional Materials Research and Innovation, University of Texas at El Paso, 500 W. University Avenue, El Paso, TX 79968, USA
* e-mail: email@example.com
Accepted: 8 June 2021
The significant impact of ultra-rapid heating continuous annealing on microstructure and mechanical properties of Al substituted Si dual phase steel under hot-dip galvanized process was studied. The heating rate of 300 °C/s, and different annealing temperatures in the range of 750 °C to 810 °C were explored. The study indicated that the yield and tensile strengths are increased with the increase of intercritical annealing temperature during rapid heating continuous annealing. When the annealing temperature was 780 °C, the steel exhibited good comprehensive properties with yield strength of 574.9 MPa, tensile strength up to 1009 MPa, total elongation of 18.5%. This is attributed to refined microstructure, appropriate proportion of phases, high density of dislocations and finely distributed NbC precipitates. Furthermore, the variations in strength, elongation and strain-hardening behavior of the steel with thermomechanical parameters and the inherent mechanism for strengthening were further discussed in relation to the microstructural features.
Key words: Dual phase steel / ultra-rapid heating / microstructure / mechanical properties / strain hardening behavior / strengthening mechanism
© EDP Sciences, 2021
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