Abstract：In order to investigate the hot deformation behavior and microstructure evolution of as-cast S32750 super duplex stainless steel, high temperature tensile tests and compression tests were carried out at different temperatures(900-1200℃) and strain rates(0.1-25s-1) by Gleeble-3800 thermo-mechanical simulator. High temperature tensile tests show that S32750 has good ductility from 1000℃ to 1200℃. The flow behavior of S32750 was investigated by high temperature compression tests. The flow curves of low temperatures and slow strain rates exhibit a particularly yield-point-elongation-like effect, which is different from single phase stainless steel. The flow curves of high strain rates or high temperatures and slow strain rates were characterized by recrystallization. The microstructure evolution shows that dynamic recrystallization (DRX) can occur in both ferrite and austenite phases, and DRX in ferrite is prior to austenite. By increasing temperature and decreasing strain rate, DRX can be enhanced. Based on this，the hot deformation equation is set up, the apparent stress exponent is 3.99, and the apparent activation energy(Q) is 393.75kJ/mo1. Its softening mechanism varies with Zener-Hollomon parameter (abbreviated Z) in the above mentioned deformation conditions, and with increasing Z parameter, the peak stress of hot deformation increases．
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