Bainitic ferrite
Bainitic ferrite forms through diffusion-controlled nucleation and shear transformation in a carbide-rich matrix. It complicates the tooling of hardness and toughness.
Physicochemical Mechanism of Action
Bainitic ferrite forms through diffusion-controlled nucleation of ferrite in a carbide-rich matrix. This process is often activated by rapid cooling or special additions like silicon and titanium.
Metallurgical Relevance & Welding Risks
Bainitic ferrite complicates the tooling of hardness and toughness in the weld. It can lead to a fine-grained structure that reduces mechanical properties. Additionally, it can increase susceptibility to hot cracks and porosity.
Workshop Practice & Action Instructions
To avoid bainitic ferrite, controlled cooling after welding should be ensured. This can be achieved by using cooling water or special coolants. Some metals require slow and continuous cooling to prevent bainite. If necessary, small amounts of additions like silicon can be used to promote deoxidation and reduce bainite formation.