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.
结果表明，熔凝区晶粒得到细化，镁合金表面的性能得到明显提高。
The results indicate that the grains of the melted layer are refined and the properties of the surface of Mg alloy are obviously improved.
试样经奥氏体区高温处理后，铈的添加细化含锡钢的奥氏体晶粒，并且使晶粒长大趋势变慢。
During the austenitizing treatment process of heated, adding cerium into steel contained tin could make grain size small, and moreover, it could make the trend of grain size growing up slow.
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