Transgranular corrosion
Transcrystalline corrosion is a form of stress corrosion cracking where cracks propagate through the crystal structure of the metal. It leads to rapid crack growth in rigid materials.
Physical-Chemical Mechanism of Action
Transcrystalline corrosion occurs when stresses are present in the material and, due to the crystal structure, lead to microscopic cracks. These cracks are then attacked by corrosive agents and grow rapidly.
Metallurgical Relevance & Risks in Welding
This corrosion can occur in rigid materials such as high-strength steels or materials with high stress resistance. It leads to rapid crack propagation and can significantly reduce the service life of components. In the weld zone, stresses can arise that promote this corrosion.
Workshop Practice & Action Guidelines
To avoid transcrystalline corrosion, it is important to ensure careful preparation and high weld quality. Use suitable protective agents and ensure proper cooling of the material. For rigid materials, stresses should be minimized, e.g., through careful material selection or optimized welding process planning.