Which one of the following is not a discontinuity common to forged products?

Shrinkage is not a common discontinuity associated with forged products. In forging processes, materials are subjected to high temperatures and pressures, which help in achieving a homogeneous structure by minimizing internal defects that typically lead to shrinkage. While some discontinuities can arise during the forging process, such as laps, bursts, and flakes, shrinkage is often mitigated due to the continuous nature of material deformation during forging. This feature enhances the overall integrity of the forged item, making shrinkage less of a concern compared to other discontinuities that can result from improper forging techniques.