Under-tooth cracking in a gear that has lost one tooth
Unusual view of a creep ruptured pipe- Note the thick oxide that is now fissured due to swelling of the ductile metal from overheating and internal pressure
Weld profiles can be helpful in evaluating weld quality
Welded joint in a tight weld preparation
When fatigue occurs in an outside environment the stages of the crack growth often show colouration that helps reveal the crack growth pattern.
White layer on the surface of a hardened component