其晶界区并不贫铬但富集磷、硅，晶界磷含量比钢中平均含量高二个数量级；
The P content at the grain boundary was two orders of magnitude greater than that of the average.
临界变形区晶粒长大的最初驱动力是晶界两侧的畸变能差。
The primary driving force of coarse grain formation in the critical deformation region is the energy difference of distortion between both sides of grain boundaries.
相变区的冷却速度减慢，晶界铁素体数量增多，针状铁素体的尺寸显著增大。
The amount of ferrite in grain boundaries and the size of acicular ferrite is increased with the increase of cooling rate during phase formation.
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