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.
退火后，孪晶逐渐消失，形成等轴的再结晶晶粒。
The twins disappeared gradually and recrystallized grains formed after annealing.
退火后，孪晶逐渐消失，形成等轴的再结晶晶粒。
The twinning disappeared gradually and recrystallized grains formed after annealing.
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.
非典型等轴细晶材料超塑变形中复杂多变的显微组织易于产生晶粒群的运动形式。
Grain group movement is easy found in superplastic deformation of the materials with complex microstructure.
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.
奥氏体不锈钢经多道次热挤压后，能得到大角度等轴晶，且晶粒尺寸呈正态分布；
The high angular equiaxed grains of Austenite stainless steel were obtained by muti-passes pressed, and the statistical grain size obey the rule of normal school.
通过对焊接接头组织的分析，发现焊核区晶粒为明显的细化再结晶等轴晶；
The microstructure of the welded joints was studied by optical microscopy. It is found that the weld nugget has a dynamic recrystallization, fine isometric crystal structure.
通过对焊接接头组织的分析，发现焊核区晶粒为明显的细化再结晶等轴晶；
The microstructure of the welded joints was studied by optical microscopy. It is found that the weld nugget has a dynamic recrystallization, fine isometric crystal structure.
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