正偏析 meaning in English

normal segregation
positive segregation

In this paper , it is proposed as a new mechanism that when a solidifying billet is in the stirring zone during continuous casting of steel , a thin steel shell is formed in front of the freezing interface , which results in a white band with a negative segregation followed by a positive one
作者提出了一个新的机制来解释白亮带的形成原因，即正在凝固的连铸钢坯位于搅拌区时，在凝固前沿形成一个薄壳，由此导致先发生负偏析，紧随其后又发生正偏析的白亮带。