Inhomogeneous carbide distribution
Inhomogeneous carbide distribution means that carbides are unevenly distributed in the metal matrix. This leads to local property variations and can cause cracks or toughness losses.
Physicochemical mechanism of action
Carbide distribution is a phenomenon where carbides (metal-carbon complexes) accumulate in the metal matrix. Inhomogeneous distribution means these accumulations are not uniform across the entire material. This can be caused by segregation or uneven melting processes.
Metallurgical relevance & risks during welding
Inhomogeneous carbide distribution leads to local property variations in the component. Areas with high carbide content are harder and less tough, while other areas are softer and tougher. This can lead to cracks, fractures, or uneven stress distributions, especially under mechanical load.
Workshop practice & instructions
To minimize inhomogeneous carbide distribution, ensure a uniform melting process and careful cooling. Use the correct filler materials and keep process parameters (temperature, time) constant when selecting welding materials and processes. For highly carbide-rich steels, prior normalization or austenitization can help homogenize the carbide distribution.