The aim of this paper was to investigate the effects of a post-deposition laser treatment on the titanium cold-sprayed coatings. Commercially pure grade 2 titanium powders were deposited onto an aluminum alloys AA2020-T3 substrate, using a commercial cold spray system. Pre-heated helium was employed as powder carrier gas. Coatings were heat treated using a 220 W diode laser, in order to improve the cohesion between titanium particles, reduce the porosity percentage and promote a homogeneous microstructure. Several samples were realized varying the thickness ratio between the two layers and the scan rate of laser source, to reproduce and investigate the effect of different temperature distributions. Geometry features and microstructure of treated zone were assessed by means of conventional optical microscopy and scanning electron microscopy. Microhardness measurements were carried out to evaluate the mechanical properties of the coating layer. A numerical model of the laser treatment was also implemented to discuss the experimental outcomes.

Laser treatment of a cold sprayed titanium coating: preliminary experimental results and numerical modelling

ASTARITA, ANTONELLO;GENNA, SILVIO;LEONE, CLAUDIO;MEMOLA CAPECE MINUTOLO, FABRIZIO;SQUILLACE, ANTONINO
2015

Abstract

The aim of this paper was to investigate the effects of a post-deposition laser treatment on the titanium cold-sprayed coatings. Commercially pure grade 2 titanium powders were deposited onto an aluminum alloys AA2020-T3 substrate, using a commercial cold spray system. Pre-heated helium was employed as powder carrier gas. Coatings were heat treated using a 220 W diode laser, in order to improve the cohesion between titanium particles, reduce the porosity percentage and promote a homogeneous microstructure. Several samples were realized varying the thickness ratio between the two layers and the scan rate of laser source, to reproduce and investigate the effect of different temperature distributions. Geometry features and microstructure of treated zone were assessed by means of conventional optical microscopy and scanning electron microscopy. Microhardness measurements were carried out to evaluate the mechanical properties of the coating layer. A numerical model of the laser treatment was also implemented to discuss the experimental outcomes.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11588/611270
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