而扩展裂纹与主应力夹角的逐渐减小则是裂纹附近张应力和剪应力集中点的变化所致。
And that the Angle between extending crack and principal axial stress decreases gradually is caused by the variation of tensile and shear stress focuses in the course of brittle formation.
铸坯中心线偏析是产生裂纹的内部条件，轧后冷却或矫直过程中的张应力是外部条件。
The internal condition for cracking is the centerline segregation of slab and the external is the tensile stress of slab formed during cooling or straightening.
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