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Microstructure and Texture Study of High Temperature Upset Forged 304LN Stainless Steel

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Recent Advances in Manufacturing Processes

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Abstract

In the present work, 304LN austenitic stainless steel has been forged, uniaxially, in the temperature range of 900 ℃ to 1200 ℃ at a strain rate of 100 s−1. The deformed samples have been characterized through electron back scattered diffraction. A recrystallized microstructure was observed at all the deformation temperatures except 900 ℃. Traces of δ ferrite formation have been observed for all the above mentioned temperatures. Development of annealing twins in the temperature range of 1000 ℃ to 1200 ℃ leads to random texture formation for the austenitic phase. On the other hand, the δ ferrite formed is having orientation [101] ∥ to the deformation axis. Development of δ ferrite in austenitic stainless steel during deformation at a high strain rate and high-temperature has been reported earlier. In addition to this, the composition of the 304 austenitic stainless steel also plays an important role in the formation of δ ferrite. The transformation of austenite to ferrite is enhanced by the dislocation interaction leading to an increase in dislocation density which is believed to facilitate the transformation. This transformation is observed in the region of intense shear.

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Acknowledgements

The author (MR) is thankful to Dr. Subrata Mukherjee, TATA Steel, R & D Division Jamshedpur, India for providing the required experimental set up to carry out the research work.

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Rout, M., Singh, S.B., Ranjan, R., Pal, S.K. (2022). Microstructure and Texture Study of High Temperature Upset Forged 304LN Stainless Steel. In: Kumari, R., Majumdar, J.D., Behera, A. (eds) Recent Advances in Manufacturing Processes. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-3686-8_9

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  • DOI: https://doi.org/10.1007/978-981-16-3686-8_9

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