Ferritic Matrix
The ferritic base structure consists of iron-rich cubic crystals with low carbon content. It is softer and more formable, making it suitable for the weld seam.
Physico-Chemical Mechanism of Action
The ferritic base structure forms at low temperatures and low carbon content. The iron atoms form a body-centered cubic lattice, which remains soft due to the low number of carbon atoms.
Metallurgical Relevance & Risks in Welding
The ferritic base structure is tough and formable, making it suitable for a good weld seam. It reduces the risk of hot cracking and increases the ductility of the joint. However, too much carbon can transform ferrite into martensite, increasing hardness and reducing formability.
Workshop Practice & Action Guidelines
To create a ferritic base structure, it is important to carry out the welding process at low temperatures and low carbon content. The hardness of the weld seam should not exceed 30 HRC to maintain ductility. At high hardness, ferrite can transform into martensite, reducing formability and increasing the risk of hot cracking.