在结构钢的白点断口中,用立体显微镜有时可以观察到沿轧制方向的暗线条;用扫描电子显微镜进行高倍观察则为未轧合的疏松残留下来的长条形空隙,内壁光滑,保留有露头枝晶、结晶台阶、显微孔洞等结晶形貌。这种空隙很可能是白点断口的一种断裂源。
Dark seams along the rolling direction in certain cases could be observed by means of stereo-microscopic examination of flakes and under higher magnifications in a SEM. These seams were identified as unhealed porosities with crystalline steps and microholes on their inner free surface. The unhealed porosities might be a possible source of flake formation.
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