Relationship between Nano and Macroscale Properties of Postfire ASTM A36 Steels
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 6
Abstract
In this study, we investigated the composition and mechanical properties of metallurgical phases present in the ASTM A36 steels subjected to postfire temperatures using nanoindentation testing in conjunction with the K++ clustering method. The specimens are exposed to target temperatures from 500°C to 1,000°C, with increments of 100°C. We extracted two nanomechanical properties, namely, hardness and Young’s modulus, from the nanoindentation tests and used them as descriptive features for the clustering analysis. Results obtained from this analysis show that average volume fractions of ferrite and pearlite were 84% and 16%, respectively. The results also revealed that the mean hardness values were in the range of 2.46 to 3.01 GPa for ferrite and 3.11 to 4.27 GPa for pearlite for the different temperature exposures. The Young’s moduli of ferrite ranged from 171.7 to 203.3 GPa, whereas the pearlite phase ranged from 181.1 to 206.8 GPa for the different temperature exposures. The obtained results also indicated the existence of a quadratic relation between the pearlite’s mean nanoindentation hardness and the yield and tensile strengths of different postfire ASTM A36 steels.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
Research presented in this paper was supported by the National Science Foundation under NSF CAREER award #2045538. Any opinions, findings, and conclusions, or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 6 • June 2022
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Received: Jul 23, 2021
Accepted: Sep 23, 2021
Published online: Mar 22, 2022
Published in print: Jun 1, 2022
Discussion open until: Aug 22, 2022
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