Microstructure and mechanical properties of NiCoCrAlY laser cladding coating after high-current pulsed electron beam irradiation

Surface modification of laser cladding coating NiCoCrAlY was carried out by high-current pulsed electron beam irradiation. The microstructure of the NiCoCrAlY coating after irradiation was studied by XRD and SEM. The results showed that the NiCoCrAlY cladding layer displays slip and a nanocrystalline structure following high-current pulsed electron beam irradiation. The high-density slip structure affects the residual stress on the surface of the melted coating, resulting in a change of the phase structure. The mechanical properties of the NiCoCrAlY coating were studied using a Vickers micro-hardness tester and a straight-line-reciprocating dry sliding wear tester. The results showed the average microhardness of the melted coating increased by 9%, and the average wear coefficient decreased by 33.7% after five electron beam irradiations.

Automated summary

Surface modification of laser cladding coating NiCoCrAlY was conducted by high-current pulsed electron beam irradiation. The microstructure of the NiCoCrAlY coating after irradiation was analyzed using XRD and SEM. Results revealed that the coating exhibited slip and a nanocrystalline structure after high-current pulsed electron beam irradiation. The high-density slip structure affected the residual stress and phase structure of the melted coating. The mechanical properties of the coating, including microhardness and wear coefficient, were improved after multiple electron beam irradiations.