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Effect of Dynamic Strain Aging on Tensile Deformation of 20MnMoNi55 Alloy

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Abstract

Results obtained from the uniaxial tensile tests of 20MnMoNi55 low-alloy RPV steel at different temperatures (varying from 27 to 450 °C) and straining rates (varying from 10−5 to 10−1 s−1) reveal that the material response is sensitive to both temperature and strain rate. For the range of temperature varying from 200 to 400 °C, in combination with different strain rates, the material shows negative strain rate sensitivity along with different kinds of serrated flow (between 200 and 310 °C), commonly termed as Portevin–Le Chatelier effect (types A, B and C). The material behavior, in that temperature–strain rate window, is described by dynamic strain aging (DSA) effect, and the changes in the mechanical properties of the material are studied. The DSA attribute of 20MnMoNi55 steel is characterized by calculating the activation energy. The x-ray diffraction technique and atomic percentage analysis using energy-dispersive x-ray suggest that the manganese influences the interstitial (carbon and/or nitrogen) diffusion by forming Mn-C and/or Mn-N pair, which can be a plausible cause of DSA in the material.

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Acknowledgments

The authors would like to thank the Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai-400085, India, for providing the material 20MnMoNi55 low-alloy RPV steel. The authors would also like to acknowledge the financial support provided by the Centre of Excellence in Phase Transformation and Product Characterisation, Jadavpur University, Kolkata-700032, India (Ref. No.: P-1/RS/275/14), for this work.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Jadavpur University, Kolkata, 700032, India

    Mrinmoy Jana, Sankar Dhar & Sanjib Kumar Acharyya

  2. Centre of Excellence in Phase Transformation and Product Characterisation, Jadavpur University, Kolkata, 700032, India

    Mrinmoy Jana

  3. Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    Jayanta Chattopadhyay

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  1. Mrinmoy Jana
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Jana, M., Dhar, S., Acharyya, S.K. et al. Effect of Dynamic Strain Aging on Tensile Deformation of 20MnMoNi55 Alloy. J. of Materi Eng and Perform 27, 6468–6478 (2018). https://doi.org/10.1007/s11665-018-3763-2

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  • DOI: https://doi.org/10.1007/s11665-018-3763-2

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