Abstract
Isothermal heat treatment close to the martensite-start temperature at various transformation times, followed by hardness and compression tests, has been performed for three new high carbon experimental nanobainitic steels. Microstructural characterization clearly revealed the formation of lower bainitic structures with plate thickness in the range of nanometers. Analysis of the volume fraction of the bainitic phase via x-ray diffraction indicates that the presence of Co and Al accelerates the transformation resulting in almost complete transformation within 24 h. The effect of transformation and the resulting microstructure on the mechanical properties are also presented. Finally, the data collected from the compression tests have been used to develop an enhanced correlation between the yield strength and hardness in steels. Comparison of the improved correlation with three other frequently used correlations from the literature reveals a good performance of the proposed correlation.
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Acknowledgments
The authors would like to thank the financial support provided by the Natural Sciences and Engineering Research Council of Canada (NSERC), Premier’s Research Excellence Award (PREA), NSERC-DAS Award, Canada Foundation for Innovation (CFI), Ryerson Research Chair (RRC) program, and CANMET-MTL. The authors would also like to thank the laboratory technicians, Q. Li, J. Amankrah, A. Heim, A. Machin, and R. Churaman, for their assistance in the experiments. Finally, the authors are also grateful to the reviewers who evaluated this manuscript and gave valuable suggestions to improve the manuscript.
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Sidhu, G., Bhole, S.D., Essadiqi, E. et al. Characterization of Isothermally Heat-Treated High Carbon Nanobainitic Steels. J. of Materi Eng and Perform 22, 3070–3076 (2013). https://doi.org/10.1007/s11665-013-0581-4
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DOI: https://doi.org/10.1007/s11665-013-0581-4