Abstract
Advanced thermo-mechanical processing of mild steels in the ferrite phase field has recently achieved breakthrough in grain refinement into the submicron regime. However, these steels often suffer from grain boundary failure and low rates of work hardening. A potential approach to overcome these challenges is to process modern high-strength low-alloy steels with multi-scale hierarchical microstructures. Thus, the applicability of advanced thermo-mechanical processing for achieving such microstructures in a high-strength low-alloy steel was studied. The microstructural evolution during warm deformation of a martensitic/bainitic starting microstructure using a Gleeble 3500 thermo-mechanical simulator at 600 °C followed by a direct aging step was investigated. The strain rate of 10 s−1 led to strain localization and, therefore, the formation of a macroscopic shear band. High-resolution characterization techniques such as electron channeling contrast imaging, electron backscatter diffraction, and transmission electron microscopy were used to reveal the ultrafine grain sizes (~ 0.5 μm) in this shear band. The mechanism behind this refinement is continuous dynamic recrystallization, as the initial grains subdivided into smaller crystallites that are confined by a mix of subgrain and high-angle grain boundaries. Two populations of precipitates were formed. Larger precipitates (mean diameter ~ 150 nm) decorate grain boundaries, whereas smaller precipitates (~ 15 nm) nucleate on dislocations and subgrain boundaries.
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Acknowledgments
This research was supported under Australian Research Council’s DECRA funding scheme (Project Number DE180100440). The authors thank Drs Simon Hager, Charlie Kong, and Qiang Zhu for technical assistance and use of facilities supported by AMMRF at the Electron Microscope Unit at UNSW. Dr Liang Chen’s help with carrying out the Gleeble experiments at the University of Wollongong is gratefully acknowledged. Furthermore, the authors would like to thank Professor Paul Munroe and Arslan Khalid for their help with the TEM investigations. The steel used in this study was supplied by voestalpine Stahl Linz GmbH (Austria).
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Manuscript submitted May 11, 2018.
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Ledermueller, C., Li, H. & Primig, S. Engineering Hierarchical Microstructures via Advanced Thermo-Mechanical Processing of a Modern HSLA Steel. Metall Mater Trans A 49, 6337–6350 (2018). https://doi.org/10.1007/s11661-018-4934-3
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DOI: https://doi.org/10.1007/s11661-018-4934-3