Cast iron matrix
The cast iron matrix is the surrounding metallic base structure in cast iron materials that encloses graphite inclusions or carbides and determines the load-bearing behavior. It can be ferritic, pearlitic, or austenitic.
Physicochemical mechanism of action
The cast iron matrix forms during cooling of cast iron deposits and mainly consists of ferrite, pearlite, or austenite. Depending on the additives and cooling rate, the matrix develops different properties.
Metallurgical relevance & risks during welding
The type of cast iron matrix influences the behavior during welding. A too-hard ferritic matrix can lead to hot cracking, while a too-soft austenitic matrix can result in poor strength and toughness. Incorrect cooling conditions can lead to uneven deformation or excessive growth of graphite inclusions.
Workshop practice & instructions for use
When welding cast iron materials, it is important to control the cooling conditions. Uniform cooling prevents uneven deformation and the growth of graphite inclusions. For severe hot cracking, a finer matrix or a special welding alloy may be required.