304 Spring Steel Wire Viscose Water Fracture

The crack reached an unstable state. Unresolved cracks, subcutaneous bubbles and nonmetallic inclusions on spring steel wire will cause wire rod cracks, and improper heating process of billet will also cause finished product cracks. The existence of nonmetallic inclusions in spring steel wire destroys the continuity of microstructure and plays the role of microcracks. When subjected to external force, the additional stress concentration first occurs at the top of the inclusion. When the stress concentration reaches a certain level, the carbide will crack, or cracks will occur at the junction of carbide and matrix. When the crack reaches the size of unstable state, the ground breaks instantly.