F550再结晶和连续冷却相变行为研究

Study on Static-recrystallization and Phase Transition underContinuous Cooling of Offshore Platform Steel F550

在MMS-200热模拟试验机上进行双道次压缩试验,测定了F550级海洋平台用钢的静态再结晶曲线;利用膨胀法、结合金相法,测定了F550连续冷却转变的膨胀曲线,获得了动态CCT曲线;研究了F550连续冷却过程的奥氏体转变及转变产物的显微组织,为现场轧制工艺的制定提供了依据。

Double-pass compression tests were carried out on the MMS-200 thermomechanical simulator to obtain static-recrystallization curves of offshore platform steel F550.By using a combined method of dilatometry and metallography,dilatometric curves of continuous cooling of F550 were measured,and dynamic CCT curves were obtained.Transformation process of austenite during continuous cooling and microstructure of the transformed products were studied.These tests could provide references for the on-site rolling process of F550.