Abstract
Crash resistance and formability relevant mechanical properties of a copper-alloyed interstitial-free (IF) steel processed under various conditions of batch annealing (BA), continuous annealing (CA), and postcontinuous annealing aging have been studied in a wide range of strain rate (3.33 × 10−4 to 200 s−1) and temperature (−100 °C to +20 °C). These properties have been compared with similarly processed traditional mild and high-strength IF steels. Assessment of various parameters such as strength, elongation, strain rate sensitivity of stress, strain-hardening capacity, temperature sensitivity of stress, activation volume, and specific energy absorption of all these steels implies that copper-alloyed IF steel is soft and formable in CA condition. It can be made stronger and more crash resistant than the conventional mild- or high-strength IF steels when aged to peak strength after CA. Room-temperature strain rate sensitivity of stress of the investigated steels exhibits a two-stage behavior. Copper in solution in ferrite causes solid solution softening at low temperatures (≤20 °C) and at high strain rates (200 s−1).
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Acknowledgments
The first author (RR) expresses his gratitude to German Academic Exchange Service (DAAD) for funding his research stay at the Department of Ferrous Metallurgy (IEHK), RWTH Aachen University, where the work was carried out. Further, all authors would like to thank Tata Steel and National Metallurgical Laboratory both in Jamshedpur, India for their contribution toward hot rolling of the material.
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Manuscript submitted July 18, 2008.
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Rana, R., Singh, S., Bleck, W. et al. Effect of Temperature and Dynamic Loading on the Mechanical Properties of Copper-Alloyed High-Strength Interstitial-Free Steel. Metall Mater Trans A 40, 856–866 (2009). https://doi.org/10.1007/s11661-008-9767-z
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DOI: https://doi.org/10.1007/s11661-008-9767-z