Stress distribution in Al₂O₃-TiC/1Cr18Ni9Ti diffusion bonded joint

The stress distribution of Al₂O₃-TiC/1Cr18Ni9Ti diffusion bonded joint was calculated using the finite element method and the effects of bonding temperature, pressure and interlayer on the stress distribution were studied.The results indicate that the axial stress and the shear stress both change greatly near the sample edge, which uniform near the center.The greatest shear stress occurs at the Al₂O₃-TiC/interlayer interface.The greatest axial tensile stress shifts from the ceramic side on the sample edge to the steel side near the edge and the value increases with the temperature decreasing.The axial compressive stress increases when the bonding temperature reduces.The increasement of the pressure can reduce the maximal axial tensile stress and improve the compressive stress. The change of the pressure has little effect on the shear stress.Both of the axial tensile stress and the shear stress decrease with Ti-Cu-Ti interlayer compared with Ti interlayer.