在下一个阶段，疲劳会逐渐向圆周方向漫延，呈现出平行于辊身表面的猫舌状断裂带。
In the next phase, a fatigue, cat's tongue like fracture band propagates progressively in a circumferential direction running more or less parallel to the barrel surface.
由于结合层往往是沿着外层金属的凝固线所形成的，因此在辊身表面所呈现的此类缺陷是不连续，不规则的。
As the interface follows the solidification front of the shell metal, the areas of soft core metal showing at the barrel surface, will be patchy and not continuous.
由于结合层往往是沿着外层金属的凝固线所形成的，因此在辊身表面所呈现的此类缺陷是不连续，不规则的。
As the interface follows the solidification front of the shell metal, the areas of soft core metal showing at the barrel surface, will be patchy and not continuous.
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