Details

Autor(en) / Beteiligte

• Liu, Y.Z.

Titel

Coaxial waterjet-assisted laser drilling of film cooling holes in turbine blades

Ist Teil von

• International journal of machine tools & manufacture, 2020-03, Vol.150, p.103510, Article 103510

Ort / Verlag

Elmsford: Elsevier Ltd

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Film cooling holes (FCHs) of nickel-based single crystal turbine blades were drilled by 532 nm Nd:YVO4 nanosecond laser in coaxial waterjet-assisted environment. Microstructure of the side wall of the FCHs was mainly investigated by means of transmission electron microscopy. The average thickness of heat affected zone (HAZ) around FCHs decreases with increasing of water flow rate. The main phase within HAZ evolves from β-NiAl to β-NiAl + γ-Ni with the increase in the water flow rate. Some γ-Ni particles in the HAZ twined along (111) plane. A small portion of the FCHs are free of HAZ when drilled by coaxial waterjet-assisted laser drilling at a laminar water flow rate ≥3.1 m/s. There are no processing-induced defects including HAZ, microcrack, and phase transformation around the FCHs when drilled at the water flow rate ≥5.1 m/s. The FCHs with high surface quality can be drilled by the coaxial waterjet-assisted laser drilling. Finally, effects of fluid water on drilling quality of the FCHs were discussed. [Display omitted] •Coaxial waterjet-assisted laser drilling is proposed for film cooling technology.•Drilling quality of film cooling holes is dependent on the flow rate of waterjet.•Heat affected zone is investigated in detail via transmission electron microscopy.•Film cooling holes in turbine blades are drilled without processing-induced defects.