Grain Boundary Carbide Network
A continuous carbide network at former austenite grain boundaries, which embrittles the material and reduces toughness.
Physicochemical Mechanism of Action
The grain boundary carbide network forms through the concentration of carbides along the boundaries between different austenite grains. These carbides are very hard and can embrittle the surrounding area.
Metallurgical Relevance & Risks in Welding
A strong grain boundary carbide network can lead to increased hardness and reduced toughness. This can cause cracks and fractures in the weld, especially when the material is under mechanical stress.
Workshop Practice & Action Instructions
To minimize the formation of the grain boundary carbide network, careful welding planning is essential. This includes using appropriate welding processes and parameters as well as controlling the cooling rate after welding. Slow cooling can help coarsen the network and reduce its negative effects.