Eutectic microstructural network
The eutectic structure network forms by simultaneous crystal growth of two phases at the eutectic temperature. It surrounds primary phases and influences mechanical behavior in cast iron.
Physical-Chemical Mechanism of Action
The eutectic grain network forms when two phases crystallize simultaneously from the remaining melt. This happens at a specific temperature, the eutectic temperature. The crystals grow continuously and often surround the primary phases in the material.
Metallurgical Relevance & Welding Risks
The eutectic grain network affects the mechanical failure behavior of cast iron. An uneven or missing network can lead to increased toughness and improved mechanical properties, while a fine network can increase hardness and impair formability.
Workshop Practice & Action Instructions
To optimally create the eutectic grain network, it is important to set the melting temperature exactly to the eutectic temperature. This can be ensured through special measuring devices and process control. During cooling, the material must be cooled slowly and controlled to obtain a homogeneous network.