A higher carbon content in the steel was favorable to form short and thick primary dendrites as well as wider primary dendritic arm spacings (PDAS) and coarsening columnar structure.

• 碳含量高，容易形成长宽比小的一次枝晶，并且一次枝晶臂间距增宽，容易形成粗大的柱状晶组织；