实验还观察到砂岩表面微缺陷发生闭合的全过程，在冷却过程也有微裂纹形成等现象。

Also a closing course of initial crack and thermal cracking coming into being in the cooling process are observed in our experiment.

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这些现象主要包括辊身所产生的局部缺陷，以及过热导致的划伤、热裂，和轧制宽度内两边缘的压力裂纹。

These are local indentations on the roll barrel combined with heat-induced bruises, firecracks and pressure cracks within or outside the rolling width.

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