对微镁处理X120管线钢轧制工艺进行热模拟,发现镁铝尖晶石可以在形变奥氏体细化与再结晶时起到形核核心的作用,同时晶界夹杂物还有晶内铁素体诱导的双重作用。镁铝尖晶石还可以在晶粒粒径小于50μm甚至10μm的形变奥氏体内直接诱导晶内铁素体形核,部分夹杂物也有在形变奥氏体内感生形核的作用。 The thermal simulation of rolling process for micro-Mg treated X120 pipeline steel shows that Mg-Al spinel can play a nucleation role in the deformation austenite refinement and recrystallization. Meanwhile, the grain boundary inclusions also have intragranular iron The dual role of the body-induced. Magnesium aluminate spinel also can directly induce intragranular ferrite nucleation in deformed austenite with grain size less than 50μm or even 10μm. Some inclusions also induce nucleation in deformed austenite.