Abstract
We explored the feasibility and benefits of rapidly heating (at over 100°C/s) a novel coating-free oxidation-resistant press-hardening steel (PHS). Experiments indicated that a total heating time of 120 s was sufficient to achieve complete austenitization at 930°C with a heating rate of 100°C/s for a 2-mm-thick coating-free PHS blank. Tensile testing results showed that ultimate tensile strength of 1722 MPa and uniform elongation of 5.1% were obtained after rapid heating, soaking, water quenching, and baking, representing a significant improvement over values for the baseline PHS 22MnB5 (1583 MPa and 4.1%) subjected to the same treatment. In addition, the thickness of the oxide layer on the coating-free PHS after rapid heating and soaking (120 s) in ambient atmosphere was less than 5 μm, being much thinner than that on the 22MnB5 (36 μm). Finally, the potential benefits of adopting a rapid heating schedule for the coating-free PHS are discussed.
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Acknowledgements
J.Y. Min and Z.R. Hou acknowledge financial support from the National Natural Science Foundation of China (No. 51805375) and the Open Research Fund from the State Key Laboratory of Rolling and Automation, Northeastern University (No. 2020RALKFKT019). The authors thank Dr. Yonggang Liu from Ma Steel and Luning Wang from Benxi Steel for providing industrial coils of the coating-free PHS and the baseline 22MnB5 for this study, and Jinlong Zhu from General Motors China Science Lab for assistance with tensile specimen preparation.
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Hou, Z., Min, J., Wang, J. et al. Effect of Rapid Heating on Microstructure and Tensile Properties of a Novel Coating-Free Oxidation-Resistant Press-Hardening Steel. JOM 73, 3195–3203 (2021). https://doi.org/10.1007/s11837-021-04877-7
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DOI: https://doi.org/10.1007/s11837-021-04877-7