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The constitutive flow behavior of Zircaloy-2 in the temperature range of 650 to 850°C and strain rate range of 0.001 to 100 s-1 has been studied using constant true strain rate hot compression tests. On the basis of these data, a processing map has been generated using the concepts of a Dynamic Material Model. The processing map has revealed a domain of dynamic recrystallization at an optimum condition of 800°C and 0.1 s-1. The material undergoes microstructural instabilities at strain rates higher than 1 s-1 and temperatures lower than 700°C. The observed constitutive flow characteristics have been validated with the help of large scale extrusion experiments conducted at two different temperatures and various extrusion ratios using a conical die semi-angle of 45°. The microstructures observed in the extruded material confirmed the predictions of the processing map. The optimum processing parameters for hot extrusion are found to be 800°C and a mean strain rate of 0.1 to 1 s-1.
Zircaloy-2, strain rate sensitivity, processing map, dynamic materials model, dynamic recovery, dynamic recrystallization, flow instability, extrusion, validation, optimization, hot workability
Bhabha Atomic Research Centre, Bombay,
Indian Institute of Science, Bangalore,
Naval Chemical and Metallurgical Laboratory, Bombay,