Estimation of flow stress by the Kocks-Mecking model at strain rate of 103/s for an ultra low carbon steel

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Abstract

Tensile flow stress of an ultra low carbon steel was investigated at temperatures between 77K and 293K with strain rates from 2×10-2/s to 2×103/s. Stress-strain curves were described by using the Kocks-Mecking model in which several parameters were determined from the experimental data obtained by conventional tensile tests with lower strain rates less than 2×100/s. It is found that the flow stress at 2×103/s estimated by the Kocks-Mecking model agrees well with the stress measured by Hopkinson-bar method. The decrease in work-hardening rate at 2×103/s was discussed from the viewpoints of temperature rise and microstructural evolution during high speed tensile deformation, leading to a conclusion that the former was a main reason.

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Park, J. H., Tomota, Y., Takagi, S., Ishikawa, S., & Shimizu, T. (2001). Estimation of flow stress by the Kocks-Mecking model at strain rate of 103/s for an ultra low carbon steel. Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, 87(10), 657–664. https://doi.org/10.2355/tetsutohagane1955.87.10_657

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