Dynamic Ferrite Formation and Evolution above the Ae3 Temperature during Plate Rolling Simulation of an API X80 Steel

Thermo-mechanically controlled rolling is a technique used to produce steel strips and plates. One of the steels widely in production heavy plates for application oil gas pipelines API X80. The hot process this family consists applying deformation passes at high temperatures, mainly above Ae3, inside austenite phase field. It has been shown that during deformation, phenomenon dynamic transformation (DT) into ferrite leads lower resistance within stable region. In investigation, torsion simulations an industrial under continuous cooling conditions were monitor formation by DT. Stress–strain flow curves equivalent mean stresses followed sample characterization via optical electron microscopy showed inevitable Ae3. employed 10-pass schedule was divided 5 roughing finishing passes, thereby promoting increased volume fraction decreased critical strain onset DT recrystallization (DRX). A microstructural analysis confirmed from first until last pass. due accumulation, number as temperature approached leading characteristic texture end simulation.