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Effect of Thermal Cycling on Tensile Properties and Impact Toughness of Hydrided Zr-2.5Nb PT Material

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Abstract

The effect of repeated thermal cycling between room temperature and 360 °C on the tensile properties and impact toughness of hydrided Zr-2.5%Nb pressure tube alloy was studied for soaking times of 10 and 30 min at peak temperature. The length of hydride platelet and interplatelet spacing of hydrides were observed to be decreasing with the increase in the number of thermal cycling. It was found that the change in hydride platelet length and its interplatelet spacing caused by thermal cycling affected the mechanical properties to a different extent. The mechanical properties, i.e., yield strength, ultimate tensile strength, elongation and impact toughness, were observed to decrease with the increase in the number of thermal cycles for 10 min soaking time, whereas no significant change was observed for the samples soaked for 30 min. The observed behavior could be attributed to the competition between the damage accumulation due to thermal cycling and stress relaxation due to soaking at peak temperature.

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Acknowledgements

The present work has been funded and sponsored by BRNS project with sanction no: 36(2)/14/14/2016-BRNS. Mr. Sushil Kumar worked under this project as a Junior Research fellow and is presently pursuing M. Tech. studies at Center for NanoScience and Engineering, Indian Institute of Science, Bengaluru-560012 Karnataka. Authors are grateful to Late Dr. S. Banerjee, former Secretary, Department of Atomic Energy and Chairman, Atomic Energy Commission for his keen interest in investigations on hydride embrittlement of Zr alloys, which provided motivation for this work. Authors thank Dr. G. K. Dey and Dr. Madangopal Krishnan, former Directors, Materials Group, BARC and Dr. Vivekanand Kain, Director, Materials Group, BARC for their constant encouragement and support. Technical assistance provided by Mr. Sandeep A. Chandansive and Mr. Pramod N. Mandavkar for hydriding and metallography of samples is acknowledged.

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Authors and Affiliations

  1. Mechanical Metallurgy Division, Bhabha Atomic Research Center, Trombay, Mumbai, 400085, India

    T. N. Murty, A. K. Bind & R. N. Singh

  2. Metallurgical Engineering Department, B.I.T. Sindri, Dhanbad, Jharkhand, 828123, India

    Sushil Kumar & B. N. Roy

  3. Division of Remote Handling and Robotics, Bhabha Atomic Research Center, Trombay, Mumbai, 400085, India

    R. K. Sahu & J. K. Mishra

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  1. T. N. Murty
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Murty, T.N., Kumar, S., Bind, A.K. et al. Effect of Thermal Cycling on Tensile Properties and Impact Toughness of Hydrided Zr-2.5Nb PT Material. Trans Indian Inst Met 75, 871–877 (2022). https://doi.org/10.1007/s12666-021-02502-4

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