Mechanical Behavior of metallic Materials Deformation and accumulation of irreversible damage Defects such as porosity, shrin kage cavities, quench cracks, grinding and stamping marks, seams, and weld-related cracks nclusions, brittle second-phase particles, and grain boundary films-lead to crack formation stress growth defect C今 crack fracture ③大季Mechanical Behavior of Metallic Materials Deformation and accumulation of irreversible damage Defects such as porosity, shrinkage cavities, quench cracks, grinding and stamping marks, seams, and weld-related cracks. Inclusions, brittle second-phase particles, and grain boundary films—lead to crack formation defect crack fracture growth stress