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Dynamic Recrystallization during Hot Deformation of 304 Austenitic Stainless Steel

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Abstract

The kinetics of dynamic recrystallization (DRX) during hot compression of 304 austenitic stainless steel was studied over the temperature range of 900-1200 °C and strain rate range of 0.002-0.1 s−1. The initiation and evolution of DRX were investigated using the process variables derived from flow curves. By the regression analysis for conventional hyperbolic sine equation, the activation energy for DRX was determined as Q = 475 kJ mol−1. The temperature and strain rate domain where DRX occurred were identified from the strain rate sensitivity contour map. The critical stress (and strain) for the initiation of DRX was determined from the inflection point on the work hardening rate (θ = dσ/dε) versus flow stress (σ) curve. The saturation stress of the dynamic recovery (DRV) curve was calculated from the θ-σ plot at the same condition at which DRX occurred. Progress of fraction recrystallization was determined from the difference between the generated DRV curve and the experimental DRX curve. In addition, the microstructural evolution at different strain levels during DRX was characterized and compared with the calculated fraction recrystallization.

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Acknowledgments

The authors would like to thank Prof. I. Samajdar of IIT Bombay for providing the EBSD facility and Dr. Rajeev Kapoor of MMD, BARC, for careful reading of the manuscript. AM wishes to thank Materials Group, BARC, for providing necessary support to complete this work.

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Authors and Affiliations

  1. Department of Metallurgical Engineering and Materials Science, IIT Bombay, Mumbai, 400076, India

    A. Marchattiwar & B. P. Kashyap

  2. Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    A. Sarkar & J. K. Chakravartty

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  1. A. Marchattiwar
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Correspondence to A. Sarkar.

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Marchattiwar, A., Sarkar, A., Chakravartty, J.K. et al. Dynamic Recrystallization during Hot Deformation of 304 Austenitic Stainless Steel. J. of Materi Eng and Perform 22, 2168–2175 (2013). https://doi.org/10.1007/s11665-013-0496-0

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  • DOI: https://doi.org/10.1007/s11665-013-0496-0

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