EXPERIMENTAL INVESTIGATION OF THE EFFECT OF LASER TREATMENT ON THE RESISTANCE OF A CERMET COATING TO A HIGH-SPEED IMPACT

For the fi rst time, experimental investigations of the resistance of a cermet coating formed by a combined method (cold gas-dynamical spraying with subsequent laser treatment) to high-speed impact was carried out. It is shown that as a result of laser interaction of TiAl–B₄C with cold gas-dynamically deposited coating, boron carbide particles dissolve in the metal matrix, and secondary phase compounds of TiC and TiB₂ are formed. Measurement of microhardness showed that created cold gas-dynamically deposited coating, involving B₄C, Ti, and Al, has a microhardness of 466.3 HV0.3, while the microhardness of a coating after laser treatment is equal to 1331.3 HV0.1. Investigation of highspeed impact has shown the infl uence of formed coatings on the size of the crater in the substrate. It is also shown that the created cermet coating (cold gas-dynamical deposition + laser radiation) decreases the crater depth in the substrate by more than twice, with the crater width decreasing by 1.4 times compared with a sample without coating
   
Author:  V. M. Fomin, A. A. Golyshev, A. G. Malikov, A. A. Filippov, V. S. Shikalov, M. A. Yadrenkin, A. M. Orishich
Keywords:  laser radiation, cold gas-dynamical deposition (CGDD), boron carbide, impact interaction, crater formation
Page:  1773