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Effect of Heat Treatment on Mechanical Properties of AISI 202 Steel at Room Temperature and 77 K

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Abstract

The performance and properties of austenitic stainless steels are strongly linked to their microstructures, mainly the amount, distribution and orientation of delta (δ) ferrite and the presence of sigma (σ) phase. AISI 202 steel in annealed (as received-AR) as well as heat treated and forced air cooled (FAC)/furnace cooled (FC) conditions contains austenitic phase and ~ 4 vol.% δ-ferrite phases. In FC condition σ-phase is also observed which is formed during the slow cooling of steel in the temperature range of 850-450 °C. Impact properties are found to be better at room temperature than 77 K. Higher impact strength is found for FAC than FC condition both at 300 and 77 K. The test temperature dependent reduction in impact strength is found to be higher for FC specimens compared to AR and FAC specimens. U-notch showed higher impact values compared to V-notch specimens at 77 K test temperature. With 4 vol.% δ-ferrite having aspect ratio of ~ 4-40, the notch direction has not shown significant effect on the impact properties.

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Acknowledgments

The authors thank the Group Director (VSSC), MMG, Deputy Director (VSSC), MME and Director of Vikram Sarabhai Space Centre (VSSC) for granting permission to publish this work.

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Authors and Affiliations

  1. Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695022, India

    R. Ranjith, G. Sudarshan Rao, Sushant K. Manwatkar, Rohit Kumar Gupta & S. V. S. Narayana Murty

  2. Indian Institute of Space Science and Technology, Thiruvananthapuram, India

    K. Prabhakaran

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Ranjith, R., Rao, G.S., Manwatkar, S.K. et al. Effect of Heat Treatment on Mechanical Properties of AISI 202 Steel at Room Temperature and 77 K. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-08332-3

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