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    Volume 8, Issue 5 (October 2019)

    Special Issue Paper

    Identification of Hot Working Conditions and No-Recrystallization Temperature for a Cr-Mo-V Reactor Pressure Vessel Steel

    (Received 16 January 2019; accepted 2 April 2019)

    Published Online: 2019

    CODEN: MPCACD

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    Abstract

    Specimens of chromium-molybdenum-vanadium steel, commonly used as reactor pressure vessel material, were hot deformed under uniaxial compression in the temperature range of 700°C–1,200°C and strain rate range of 0.001–10 s−1 in a Gleeble thermomechanical simulator. The strain rate sensitivity (m) map was generated using the flow curves data. The maximum m value of 0.22 was obtained in the temperature range of 1,100°C–1,200°C and strain rate range of 0.01–0.1 s−1. Optical micrographs were used to correlate the deformed microstructures with the hot compression parameters. Kinetics analysis within the high m domain yielded the activation energy as 275 kJ mole−1 and the stress exponent as 4.46. Further, a multistep deformation (at constant strain rate with varying temperature) technique, widely used to identify the temperature of no-recrystallization (inhibition of recrystallization), was performed at 0.001, 0.01, 0.1, and 1 s−1, with temperatures varying from 1,150°C–800°C. The determined value of the temperature of no-recrystallization was approximately 920°C, meaning below this value of temperature dynamic recrystallization would be inhibited.

    Author Information:

    Bharat Reddy, G.
    Mechanical Metallurgy Division, Materials Group, Bhabha Atomic Research Center, Trombay, Mumbai

    Sarkar, Apu
    Mechanical Metallurgy Division, Materials Group, Bhabha Atomic Research Center, Trombay, Mumbai

    Kapoor, Rajeev
    Mechanical Metallurgy Division, Materials Group, Bhabha Atomic Research Center, Trombay, Mumbai

    Kumar, Harish
    Advanced Light Water Reactor Division, Reactor Project Group, Bhabha Atomic Research Center, Trombay, Mumbai

    Shrivastav, Vivek
    Advanced Light Water Reactor Division, Reactor Project Group, Bhabha Atomic Research Center, Trombay, Mumbai


    Stock #: MPC20190017

    ISSN:2379-1365

    DOI: 10.1520/MPC20190017

    Author
    Title Identification of Hot Working Conditions and No-Recrystallization Temperature for a Cr-Mo-V Reactor Pressure Vessel Steel
    Symposium ,
    Committee A01