Determination of Non-Recrystallization Temperature for Niobium Microalloyed Steel

In the present investigation, non-recrystallization temperature (TNR) of niobium-microalloyed steel is determined to plan rolling schedules for obtaining desired properties steel. The value TNR based on both alloying elements and deformation parameters. literature, equations have been developed utilized. However, each equation has certain limitations which constrain its applicability. This study was completed using laboratory-grade low-carbon Nb-microalloyed steels designed meet API X-70 specification. Nb- microalloyed processed by melting casting process, composition found optical emission spectroscopy (OES). Multiple-hit tests were carried out a Gleeble® 3500 system in standard pocket-jaw configuration determine TNR. Cuboidal specimens (10 (L) × 20 (W) (T) mm3) taken compression test (multiple-hit tests) gleeble. Microstructure evolutions OM (optical microscopy) SEM (scanning electron microscopy). 0.1 wt.% niobium bearing ~ 951 °C. rolled at produce partially recrystallized grain with ferrite nucleation. Hence, verify value, process applied finishing near (~951 °C). microstructure also revealed pancake shape, confirms