Static recrystallization kinetics of 304 stainless steels

Abstract

Static restoration mechanism during hot interrupted deformation of 304 stainless steel was studied in the temperature range from 900 to 1100°C, various strain rate from 0.05 to 5/sec and pass strain of 0.25–3 times peak strain. It was clarified that the static recrystallization was happened after 3–10 seconds at first deformation. The static restoration was depended on the pass strain, deformation temperature and strain rate and fractional softening (FS) values increased with increasing strain rate, deformation temperature and pass strain. Recystallization kinetics was explained with Avrami equation and Avrami constant was 1.113. This value was independent of deformation variables significantly. The time of 5, 50, 95% recrystallization was evaluated using such equations: t _0.05 = 2.9 × 10⁻¹² ∈^−1.17 ${\dot \varepsilon }$ ^−0.94 D exp(222000 J/mol/RT), t _0.5 = 2.0 × 10⁻¹⁰ ∈^−1.56 ${\dot \varepsilon }$ ^−0.81 D exp(197000 J/mol/RT), t _0.95 = 1.9 × 10⁻⁸∈^−1.63 ${\dot \varepsilon }$ ^−0.76 D exp(173000J/mol/RT). The predicted values by use of upper equations had a good agreement with a measurement.