Dendritic austenite
Dendritic austenite is a tree-like branched structure of γ-iron that forms during casting cooling and exhibits chemical inhomogeneities. It shapes the microstructure of high-alloy steels.
Physical-Chemical Mechanism of Action
Dendritic austenite forms during casting cooling through rapid cooling of the melt. Tree-like branched structures of γ-iron develop with chemical inhomogeneities such as segregations.
Metallurgical Relevance & Risks in Welding
Dendritic austenite can lead to increased toughness and improved mechanical properties. However, it can also cause increased grain growth and chemical impurities that can make welding more difficult. If handled incorrectly, this can lead to cracks or uneven stresses in the structure.
Workshop Practice & Instructions
To weld dendritic austenite optimally, controlled cooling is required. Use a slow cooling rate and pay attention to the correct melting temperature. For high-alloy steels, it may be helpful to perform an austenitizing treatment before welding to homogenize the structure.