Pearlite Interlamellar Spacing
The spacing between adjacent cementite lamellae in pearlite influences the strength of the steel according to the Hall-Petch principle.
Physical-Chemical Mechanism of Action
In pearlite, lamellae of ferrite and cementite form. The spacing between these lamellae (interlamellar spacing) affects the movement of shear lines through the material.
Metallurgical Relevance & Welding Risks
Too large an interlamellar spacing can lead to increased toughness, which limits the formability and ductility of the steel. Too small a spacing can result in low strength and higher susceptibility to cracking.
Workshop Practice & Instructions
When welding pearlite, it is important to control the cooling rate. Fast cooling can lead to too large an interlamellar spacing and increased toughness. Slow cooling can reduce the spacing and improve strength. Recommended cooling time: 10-20 seconds per cm² of weld area.