Abstract
Two transformation-induced plasticity steels, with and without Nb–Ti additions, were subjected to uniaxial tension after simulated thermo-mechanical processing. Electron back-scattering diffraction, with phase segmentation implemented during post-processing, was used to investigate the stability of retained austenite (RA) by analyzing its size, morphology, and neighboring phases. The rate of RA transformation to martensite was higher in the Nb–Ti-containing steel than in the base steel as most RA was co-located between bainitic ferrite with parallel arrangement of laths in the former steel. Depending on the location of RA and the developed stress state, its stability in tension declines in the following order: RA in bainite > RA at polygonal ferrite/bainite interfaces > RA embedded in polygonal ferrite grains and at polygonal ferrite triple junctions or grain boundaries. Fine grains of RA may be less stable than their coarser counterparts if they are located in unfavorable stress regions of the microstructure.
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Notes
In theory, the normalized area fraction of martensite at fracture should be approximately equal to the sum of the normalized area fractions of RA and martensite at 0 strain. However, the above logic holds true only when the same area is tracked at different strains. It is reemphasised that this is not the case in the present study.
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Acknowledgements
The authors are grateful to POSCO and Profs. H. Kim and B.C. De Cooman, GIFT-POSTECH, for providing the steels. The EBSD work was undertaken on a JEOL JSM-7001F FEG-SEM funded by the Australian Research Council-Linkage, Infrastructure, Equipment and Facilities Grant LE0882613. The Oxford Instruments 80 mm2 X-Max EDS detector was funded via the 2012 UOW Major Equipment Grant scheme.
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Al-Harbi, F., Gazder, A.A. & Pereloma, E. An EBSD Study on the Stability of Retained Austenite in Low-Si TRIP Steels During Uniaxial Tension. JOM 73, 3169–3180 (2021). https://doi.org/10.1007/s11837-021-04880-y
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DOI: https://doi.org/10.1007/s11837-021-04880-y