解决这一问题的关键是扩大铸坯等轴晶区比例，细化晶粒。
The key to solve these problems is enlarging equiaxed grain zone and fining grain size.
研究结果表明，向钢液中加入形核剂可有效地扩大等轴晶区。
The results show that adding medium carbon nucleating agents into high carbon steel grade can effectively enlarge equiaxed grain zone and fine grain size;
结果表明：锂能消除合金凝固态的柱状晶区并使之转变为等轴晶区；
The results show that the dendrite crystal area of alloy is diminished and then become equiaxed structures after lithium is added;
过滤后铸棒组织中的柱状晶区缩小，中心等轴晶区扩大、晶粒度降低。
The area of columnar structures decreased, and that of equiaxed crystals enlarged. The grain size reduced.
焊缝区组织主要为等轴晶和树枝柱状晶，熔合区组织主要为柱状晶。
The crystallizing morphology on the weld seam was equiaxed grains and dendrites and that on the fusion area were columnar crystals.
在柱状晶与等轴晶过渡区中存在着偏聚物。
Segregated solutes and inclusions are distributed at the transition boundary of the column crystal and the equiaxial crystal.
结果表明，激光处理后试样表面熔凝区的组织主要为胞状枝晶组织，经后续热处理可转变为细小的等轴晶粒组织，并形成了良好的超塑连接条件。
The results show that, after laser surface processing, a melt layer with cellular-dendrite structure is formed, which could transform into very fine-grained structure during the annealing treatment.
结果表明，激光处理后试样表面熔凝区的组织主要为胞状枝晶组织，经后续热处理可转变为细小的等轴晶粒组织，并形成了良好的超塑连接条件。
The results show that, after laser surface processing, a melt layer with cellular-dendrite structure is formed, which could transform into very fine-grained structure during the annealing treatment.
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