Journal Published Online: 03 June 2019
Volume 8, Issue 5

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

CODEN: MPCACD

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, India
Sarkar, Apu
Mechanical Metallurgy Division, Materials Group, Bhabha Atomic Research Center, Trombay, Mumbai, India
Kapoor, Rajeev
Mechanical Metallurgy Division, Materials Group, Bhabha Atomic Research Center, Trombay, Mumbai, India
Kumar, Harish
Advanced Light Water Reactor Division, Reactor Project Group, Bhabha Atomic Research Center, Trombay, Mumbai, India
Shrivastav, Vivek
Advanced Light Water Reactor Division, Reactor Project Group, Bhabha Atomic Research Center, Trombay, Mumbai, India
Pages: 10
Price: $25.00
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Stock #: MPC20190017
ISSN: 2379-1365
DOI: 10.1520/MPC20190017