Nickel-Base Creep Deformation
Nickel-base creep is a time- and temperature-dependent plastic deformation of nickel superalloys under sustained mechanical load. It leads to long-term elongation and can cause component failure.
Physical-Chemical Working Principle
Nickel-base creep is continuous plastic deformation of metals under constant mechanical load. It happens through thermally activated dislocation creep and grain boundary sliding, causing atoms to move within the crystal lattice.
Metallurgical Relevance & Risks in Welding
Nickel-base creep can lead to long-term component degradation, especially under high temperatures and constant mechanical loads. It can cause elongation and deformation of parts, affecting safety and service life.
Workshop Practice & Instructions
To minimize nickel-base creep, take the following measures:
• Use optimal temperature and time during welding to stabilize the structure.
• Keep mechanical load as low as possible during and after welding.
• Regularly inspect parts for elongation and deformation.