Investigation on Hot Deformation Behavior of 409L Ferritic Stainless Steel

摘要

The hot deformation behavior and microstructure evolution of 409L ferritic stainless steel (409LFSS) were investigated in the temperature range 1223 K to 1423 K and stain rate range 0.05 s-1 to 2.5 s-1 using a thermo-mechanical simulator. The effects of temperature and strain rate on the flow behavior and microstructures of 409 L ferritic stainless steel at reduction ratio 50 % were analyzed. Results indicate that the apparent stress exponent and the apparent activation energy of the steel are about 4.45 and 262 kJ/mol, respectively. The hot deformation equation of 409LFSS is considered as &= 5.347 × 1011[sinh(α-σp)]445 exp(-262000/RT) . There is a relationship between the softening mechanism and Zener-Hollomon parameter(abbreviated Z). As the Z value increases from 2.09×108 to 3.92×1011, the hot deformation peak stress correspondingly increases from 13.73 Mpa to 65.08 Mpa.