Pearlite-Cementite Boundary
The boundary between pearlite and excess cementite, where stress concentrations can occur and influence crack initiation behavior.
Physical-Chemical Mechanism of Action
The pearlite-cementite boundary is the region in the microstructure where pearlitic colonies come into contact with excess cementite. Under mechanical loading, stress peaks can occur, which can lead to cracks.
Metallurgical Relevance & Welding Risks
This boundary influences crack initiation behavior and can lead to hot cracks and stress cracks. Incorrect cooling or insufficient mechanical loading can jeopardize the stability of the boundary.
Workshop Practice & Action Instructions
To minimize risks, pay attention to controlled cooling and avoid excessive mechanical loading. Under heavy loads, it is advisable to split the welding process into multiple passes or introduce additional stress limitations.