激光直接沉积TA2/TA15梯度材料弯曲性能的有限元模拟

TA2/TA15 gradient material was prepared using the laser direct deposition technique. The microstructural evolution and bending properties of this material were investigated, and the stress-strain behaviors of the gradient-transition zone with different compositions were discussed by finite-element simulation. The results show that when the alloy composition transitions from TA15 of bottom to TA2, the microstructure gradually changes from an α+β basket-weave phase to a single-α phase, the types of alloy elements and β-phase volume fraction gradually decrease, and the α-phase volume fraction gradually increases. The microhardness and bending strength increase with the increase of Al-element content and the bending strength gradually increases from 964 MPa to 2156 MPa. The finite element stress field simulation results show that the top is subjected to compressive stress and the bottom is subjected to tensile stress during bending deformation of the specimen. Compared with the TA15 sample, the decrease of Al content will reduce the bending strength of the gradient material but greatly improve the plastic ability and achieve the uniform stress transition. Among all the samples, GZ-3 has the best comprehensive properties.