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Femtosecond laser machining of single-crystal superalloys through thermal barrier coatings
Feng, Q; Picard, YN; McDonald, JP; van Rompay, PA; Yalisove, SM; Pollock, TM
Femtosecond laser machining of single-crystal superalloys coated with thermal barrier coatings (TBCs) has been investigated. The investigations were carried out in air using a titanium: sapphire laser system (lambda = 780 nm) operating at a repetition rate of 1 kHz and delivering individual pulses of 150 fs in duration. The ablation threshold of 7 wt.% yttria stabilized zirconia (7YSZ) has been measured to be 1.52 +/- 0.21 J/cm(2). Microstructural investigations indicated a complete absence of conventional processing defects such as recast layers and microcracking in the vicinity of the machining area. The absence of machining-induced melting or delamination along interfaces of the TBC system demonstrates a significant advantage in comparison with conventional laser machining. (c) 2006 Published by Elsevier B.V.
Materials Science And Engineering A-Structural Materials Properties Microstructure And Processing
2006
430
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