Microstructural Characteristics and Mechanical Properties of Laser Cladded Ni+TiB2 Composite Coating on Ti6Al4V Surface
In order to improve the wear resistance performance laser cladded Ni+TiB2 composite coating prepared on Ti6Al4V surface,the influence of powder ratio on microstructure and mechanical properties is studied.The laser cladding coating is mainly composed of TiB,TiB2,α-Ti,β-Ti,NiTi alloy solid solution and TiO2.The cladding layer is mainly com-posed of black elliptic phase,elongated needle-like phase and surrounding cell crystal phase.The black elliptic phase,nee-dle-like phase and surrounding cell crystal phase are TiB2,TiB,NiTi,respectively.When the TiB2 additive amount content increases,the TiB content increases,the TiB metallographic particles become coarse.The highest microhardness of the clad-ding layer reaches 920.8 HV1.0,which is about 3 times that of the Ti6Al4V alloy,the increased microhardness improves the wear resistance properties of the cladding coating.The brittle spalling becomes more serious with the load increasing,and the composite coating is not suitable for high load conditions.
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