Verified — Flt Cracks Hot

This interaction is dangerous because it invalidates standard damage-tolerance models. A crack that might be calculated to grow slowly based on fatigue data alone can suddenly accelerate as the surrounding material softens and oxidizes. In turbine blades, this is often exacerbated by "hold times"—the duration the engine runs at high temperature. The longer the hold time at high heat, the more creep damage accumulates, widening the crack tip.

: As a weld pool cools, the metal shrinks. If the shrinking metal is restrained or if the cooling rate is uneven, the remaining liquid between the solidifying grains is pulled apart by tensile stresses, forming a crack. The "Fillet" Factor flt cracks hot

While FLT forks are not typically glowing red, "hot" in this context refers to or stress-induced heating : The longer the hold time at high heat,

“Hot cracking in additively manufactured and wrought Ni-based superalloys: A review of mechanisms, detection methods, and mitigation strategies” Authors: S. Kou, Y. Chen (2021, Welding Journal , Vol. 100, pp. 1-15) The "Fillet" Factor While FLT forks are not

The keyword "flt cracks hot" implies a dynamic interaction: the laser hits a crack, and the crack reacts thermally .