Abstract
The dynamic (DRX) and metadynamic (MDRX) recrystallization behaviour of an as-cast precipitation hardenable stainless steel has been investigated by conducting continuous and interrupted hot compression tests in the temperature range of 900 to 1150 °C and under strain rates of 0.001 to 1 s−1. The effects of temperature and strain rate and the Zener-Hollomon parameter (Z) on the flow behaviour and peak strain were investigated by continuous tests and the equation ϵp = 4.3 × 10−4Z0.14 was proposed. The kinetics and fractional softening of MDRX were found to increase with temperature and strain rate. The Avrami exponent n was determined as 0.5 and the equation X = 1 – exp [−0.693 (t/t0.5)]0.5 was proposed. From the variation of t0.5 with deformation temperature and strain rate, the equation t0.5 = 1.73 × 10−7 ϵ−0.33 exp(191000/RT) was proposed.
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