SynopsisA critical condition for static recrystallization of austenite (r) in plate rolling process has been formulated in terms of the change in average dislocation density. The latter was calculated from the decrease in stress due to recovery and recrystallization observed by the double deformation tests. The main results are summarized as follows:(1) The relation among stress, strain and average dislocation density has been formulated. By the present formulation, deformation stress for practical conditions of the controlled rolling of plate can be calculated as a function of temperature, strain, strain rate and r grain size.(2) The behavior of static recovery and recrystallization taking place during holding period after deformation has also been formulated as a function of dislocation density. This formulation makes it possible to estimate the critical condition for static recrystallization during an interval time between the successive rolling passes of plate.(3) Deformation conditions such as temperature, strain, strain rate, Y grain size and interval time between passes affect the critical condition for recrystallization. The shorter interval time elevates the temperature limit of non recrystallization.

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