Fracture surface
The fracture surface is the exposed surface of a material specimen after failure, which experts use to analyze the cause of fracture. It indicates whether it is a ductile deformation fracture, a brittle fracture, or a fatigue fracture.
Physical-Chemical Mechanism of Action
The fracture surface forms upon material failure through the destruction of atomic bonds. Depending on the type of fracture (ductile, brittle, or fatigue), it exhibits different microstructures and patterns.
Metallurgical Relevance & Risks in Welding
Analysis of the fracture surface helps determine the cause of failure in weld areas. A ductile deformation fracture indicates insufficient stress absorption, while a brittle fracture suggests excessive stresses or lack of hardness. A fatigue fracture can result from uneven stress distribution or faulty welding process.
Workshop Practice & Instructions
After a weld failure, carefully examine the fracture surface. This can be done using optical microscopy or electron microscopy. The results help optimize the welding process to prevent future failures.