The supersaturated precipitates form when the migration rate of ledge becomes fast, which remain some microalloy elements in the ferrite matrix and precipitate in the subsequently treatment.

• 当界面阶梯之移动速度变快时会使得界面析出碳化物无法形成，造成多馀之微合金元素会残留在肥粒铁基地中而随著后续之热处理过程产生过饱和析出之现象。