Effect of grinding-induced residual stress on the mechanical properties of SiCf/SiC composite cladding

Centerless grinding was employed to machine the surface of SiC f /SiC composite cladding. The morphology of the ground coating was examined by scanning electron microscopy, and the residual stress was measured via micro-Raman spectroscopy. This study systematically investigated the effect of grinding depth on residual stress and its subsequent influence on the mechanical properties of the cladding. The results indicate that the as-deposited coating exhibited residual tensile stress After grinding, it transitions to residual compressive stress, which initially increases and then decreases with increasing grinding depth. The hardness of the ground coating ranged from 2611.40 to 3024.20 HV, and the fracture toughness ranged from 1.0 and 1.63 MPa·m 1 / 2 , both hardness and toughness show a negative correlation with residual tensile stress. Following grinding treatment, the radial crush strength of the cladding was significantly improved. Moreover, under the same grinding depth, the induced compressive residual stress effectively enhanced the mechanical performance of the SiC f /SiC composite cladding.