The grain refinement begins from the center ellipsoidal zone, and then gradually expands to the vertical edge zone and conical contact zone.
细化首先开始于易变形区，再相继扩展到纵向棱边区和接触锥形区。
The grain refinement begins from the center ellipsoidal zone, and then gradually expands to the vertical edge zone and conical contact zone.
细化首先开始于易变形区，再相继扩展到纵向棱边区和接触锥形区。
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