Ledeburitic Eutectic
Ledeburite eutectic is a hard, brittle microstructure of globular or network cementite and a surrounding austenitic matrix. It forms during rapid cooling of high-temperature weld zones.
Physicochemical Mechanism of Action
The ledeburite eutectic forms by rapid cooling of a metal, where the austenitic phase transforms too quickly into a granular structure. This leads to strong stress buildup within the weld.
Metallurgical Relevance & Risks in Welding
Ledeburite eutectic is very brittle and can lead to hot cracks and fractures. It reduces the mechanical properties of the weld, especially its toughness and shape stability.
Workshop Practice & Instructions
To minimize the risk of ledeburite eutectic, cooling should be controlled. This can be achieved by using cooling water or special coolants. The cooling rate should be set so that the structure develops a homogeneous texture and no brittle phases form.