Microholes for the production of gasoline direct injection nozzles were obtained by ultrashort pulsed laser machining in martensitic stainless steels. The inner surface analysis was carried out by a specifically conceived Scanning Probe Microscopy instrument and revealed the presence of periodic surface microstructures whose formation was studied as a function of process parameters (pulse energy, repetition rate, rotational speed, drilling strategy). Experiments demonstrated that geometrical features of the microstructures can be varied by a proper parameter selection and open the perspective for an optimized process enabling a reduction of coking accumulation during service life and a more effective atomization of the fuel jet.
Ultrashort pulsed laser drilling and surface structuring of microholes in stainless steels / Romoli, Luca; C. A. A., Rashed; G., Lovicu; G., Dini; F., Tantussi; F., Fuso; M., Fiaschi. - In: CIRP ANNALS. - ISSN 0007-8506. - 63:1(2014), pp. 229-232. [10.1016/j.cirp.2014.03.053]
Ultrashort pulsed laser drilling and surface structuring of microholes in stainless steels
ROMOLI, Luca;
2014-01-01
Abstract
Microholes for the production of gasoline direct injection nozzles were obtained by ultrashort pulsed laser machining in martensitic stainless steels. The inner surface analysis was carried out by a specifically conceived Scanning Probe Microscopy instrument and revealed the presence of periodic surface microstructures whose formation was studied as a function of process parameters (pulse energy, repetition rate, rotational speed, drilling strategy). Experiments demonstrated that geometrical features of the microstructures can be varied by a proper parameter selection and open the perspective for an optimized process enabling a reduction of coking accumulation during service life and a more effective atomization of the fuel jet.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
