By increasing the speed of cooling, the dendrite arm spacing of austenite, especially the secondary dendrite arm spacing, could be decreased evidently, which was advantaged to improve the synthetic mechanical properties.

• 冷却速度增加可明显减小初生奥氏体的枝晶间距，特别是二次枝晶间距的缩小，对提高中铬铸铁的综合力学性能非常有利。