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Physical Simulation of Hot Deformation of Low-Carbon Ti-Nb Microalloyed Steel and Microstructural Studies

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Abstract

Constitutive equations for the flow behavior of a 0.13 pct C-1.52 pct Mn-0.28 pct Si-0.05 pct Nb-0.052 pct Ti microalloyed steel are determined. For this purpose, uniaxial hot compression tests were performed over a wide range of strain rates (0.01 to 80 s−1) and temperatures (750 to 1050 °C). From microstructural observations, the physical processes that occurred during deformation are discussed and related to the stress-strain responses. Using sinh type constitutive equation, the average apparent activation energy for hot deformation is obtained as 359 kJ/mol. The processing map obtained using the power dissipation efficiency, η, correlates well with microstructural changes observed. In the temperature range of 825-1050 °C and strain rate range of 0.01-0.1 s−1, the strain rate sensitivity map and the power dissipation map exhibit a peak domain wherein dynamic recrystallization is the primary restoration mechanism. Safe domains of strain, strain rate, and temperature for hot working of this steel have been identified.

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Acknowledgments

The authors are grateful for the support received under the DST-BMWF, ÖAD Indo-Austrian scientific cooperation scheme. In addition, the authors would like to thank Dr. Cecilia Poletti and Martina Dikovits of Technical University, Graz, Austria for help in conducting the high strain rate compression tests.

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  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, 247667, India

    S. K. Rajput, G. P. Chaudhari & S. K. Nath

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  1. S. K. Rajput
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Correspondence to G. P. Chaudhari.

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Rajput, S.K., Chaudhari, G.P. & Nath, S.K. Physical Simulation of Hot Deformation of Low-Carbon Ti-Nb Microalloyed Steel and Microstructural Studies. J. of Materi Eng and Perform 23, 2930–2942 (2014). https://doi.org/10.1007/s11665-014-1059-8

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  • DOI: https://doi.org/10.1007/s11665-014-1059-8

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