Which of the following cannot be regarded as an internal structure defect?

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Forming Process topics include: Metal forming processes, behaviour and its classification, hot and flat rolling, extrusion and wire drawing, roll pass principle, rolled parts defects, open and closed die forging and drop and press forging, blanking and piercing. Metal forming is a manufacturing process that involves reshaping raw metal stock into a finished part. It's a vital industry and the foundation of modern industrial manufacturing.  Forming processes include: Forging: A metal shaping process that involves the application of compressive forces to deform a metal workpiece into a... Show more

Which of the following cannot be regarded as an internal structure defect?