Ferritic Network
Ferritic network is a connected precipitation of ferrite in hypoeutectoid steels during slow cooling. It reduces plastic deformability and can lead to hardness problems.
Physical-Chemical Mechanism of Action
Ferritic network forms when hypoeutectoid steel (e.g., Fe-Mn steel) cools slowly. The austenite grain boundaries break up and ferrite forms a connected phase. This process is typical for metals with low carbon content.
Metallurgical Relevance & Welding Risks
A strong ferritic network can reduce the plastic deformability of steel, leading to hardness problems and possible cracks. It also increases the susceptibility to hot cracking and alters the mechanical behavior of the weld.
Workshop Practice & Action Instructions
To minimize ferritic network, it is important to ensure rapid cooling of the steel after welding. This can be achieved by using cooling water or special cooling media. For steels with high ferrite content, hardness control and the cooling pattern must be closely monitored to ensure an optimal weld.