Transgranular Cracking
Transcrystalline cracking is the propagation of cracks through the crystallites, across the grain structure. This typically happens with stress corrosion cracking and follows crystallographic planes.
Physical-Chemical Mechanism of Action
Transcrystalline cracking occurs when stresses in a metallic material are too high. The cracks break through the grains and follow the preferred crystallographic planes of the material. This leads to rapid crack growth across the grain structure.
Metallurgical Relevance & Risks in Welding
This type of cracking can be particularly dangerous because it grows quickly and uncontrollably. It can lead to severe hot cracking, especially under high stress states or when the material is susceptible to corrosion. This increases the risk of material failure and reduces the service life of components.
Workshop Practice & Action Guidelines
To avoid transcrystalline cracking, careful stress control during welding is essential. Use suitable anti-corrosion agents and ensure proper cooling of the material. At high stresses, additional measures such as stress-relief treatments may be necessary.