Grain-Size Effects during Dynamic Recrystallization of Nickel

Abstract

The effect of initial grain size on the hot torsional behaviour of nickel has been examined in the range 800–1000° C over a wide range of strain rates. Significant changes in the torque/twist curves have been observed. Metallographic examination has shown that the kinetics of dynamic recrystallization is accelerated by decrease in grain size. Recrystallization proceeds by nucleation of new grains with limited growth forming colonies of new grains. Grain-boundary nucleation is usually observed but in certain circumstances intragranular nucleation occurs.