Abstract
The evolution of micro/nanostructure in metals subjected to high-pressure torsion (HPT) still need to be explained theoretically although experimental datasets are growing persistently. A major problem associated with the understanding of HPT is the synergetic effect of several competing processes that alter the material structure. In this study, we propose a piecewise model to analyze material hardness and true strain data during the HPT procedure. The model is built on two postulates: (a) the hardness vs true strain dependence is a sum of two piecewise power-law functions (each of these functions describes an unique micro/nanostructural stage of the deformation) and (b) each piecewise function has free-fitting strain breakpoints, which limit the strain range in which one mechanism predominantly determines the micro/nanostructure. The model was applied to analyze the HPT data for pure polycrystalline iron, AISI 1020 steel, and AISI 13B20 steel to reveal the distinctive strain breakpoints and power-law exponents. In the result, we found that deduced power-law exponents for AISI 1020 and AISI 13B20 steels are remarkably close to each other within full strain range.
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Acknowledgments
Authors thank Dr. T. M. Gapontseva (M. N. Mikheev Institute of Metal Physics) for fruitful discussion and valuable help, and Justin Brooks (Robinson Research Institute, Victoria University of Wellington) for proofreading the manuscript. Authors also thank financial support provided by the Ministry of Ministry of Science and Higher Education of the Russian Federation (theme “Pressure” No. AAAA-A18-118020190104-3).
Data Availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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The authors declare no conflict of interest.
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Manuscript submitted December 16, 2020; accepted July 13, 2021.
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Talantsev, E.F., Degtyarev, M.V., Chashchukhina, T.I. et al. Piecewise Model with Two Overlapped Stages for Structure Formation and Hardening upon High-Pressure Torsion. Metall Mater Trans A 52, 4510–4517 (2021). https://doi.org/10.1007/s11661-021-06403-5
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DOI: https://doi.org/10.1007/s11661-021-06403-5