A rough forging shows an indication that extends deeply into the part and is sharp. What is the likely identity of this indication?

The indication described as extending deeply into the part and being sharp is most likely identified as a forging burst. This type of defect typically occurs during the forging process when material flow is interrupted, leading to localized stresses. The result is a sharp, deep indication that is a clear sign of the material failing under pressure, often presenting as a split or a crack.

Forging bursts are particularly problematic as they can compromise the structural integrity of the component. Their sharpness and depth distinguish them from other types of indications which may not penetrate as deeply or may have a more rounded appearance. In contrast, other indications like laps, flakes, or seams usually show a different morphology or are related to different issues in the forging process, such as improper material handling or inadequate heating. Therefore, recognizing the unique characteristics of a forging burst is essential for accurate defect identification and subsequent remedial actions.