Reheat cracking
Definition
Intergranular cracking in the heat-affected zone of welds in certain alloy steels during post-weld heat treatment or early elevated-temperature service, caused by concurrent carbide precipitation embrittlement and residual stress relaxation.
Related terms
- Creep
- Time-dependent plastic deformation of a material under sustained stress at elevated temperature, occurring at stress levels below the conventional yield strength.
- Grain-boundary sliding
- Relative motion of adjacent grains along their shared boundary, a key deformation mechanism at elevated temperature that opens voids at triple points...
- Hot corrosion
- Accelerated degradation of a superalloy or coated turbine component by molten sulfate or vanadate deposits that flux and dissolve the protective oxide...
- Larson-Miller parameter (LMP)
- A temperature-time combination parameter T(C + log t_r) used to correlate and predict rupture life across different temperature-stress combinations for a given...
- Minimum creep rate
- The steady-state strain rate during secondary creep, the single most important material parameter for structural life assessment under creep conditions.
Explained in
- Creep and Elevated-Temperature FailureIntergranular cracking in the heat-affected zone of welds in certain alloy steels during post-weld heat treatment or early elevated-temperature service, caused...