严重的正偏析集中在中心线周围。
The serious positive segregation centralizes around the centreline of the billet.
在板坯中碳的偏析同时存在负偏析区和中心正偏析。
In the slab, the negative carbon segregation region and positive segregation in the center are observed simultaneously.
还发现，在铸锭的中心靠上的区域形成正偏析，在铸锭的外部区域形成负偏析。
The positive segregation in the upper center and the negative segregation in the exterior region of the ingot are found at the same time.
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