damages-in-turbine-blades-by-finishingTypical finishing-related damages in turbine blades:Blocking of boresthrough- Melt beads- Blasting media- Coating powderMelting duringlaser boringMelt beads fromlaser boringCoating flaws-Thickness-Element concentration-FoulingFlawed coating(protectivemasking breaks through diffusion layer)Overheating duringgrinding withgrinding cracks(hot cracks) Reaction zone with cast workholding material (low-melting alloy suchas PbBi)Spot-shaped reaction zonesdue to dust particles (suchas from coating powder) Damage to thebore wall due tothe boring processCracks under the welded-on hardfacing BBlockage of bores (Al2O3)and reactions (SiC) in bores through blasting mediaCDFEAGIKMLDyn. fat. crackCoating crack due to:- Clamping forces- Handling- Straightening- Heat treatmentHNRecrystallization insingle-crystalsO