Research on the microstructure and mechanical properties of typical TA18 titanium alloy forgings
A study was conducted on the microstructure and mechanical properties of a representative TA18 titanium alloy forging produced by a specific process.The results show that the forging is mainly composed of the α phase and a small amount of intergranular β phase.In the central region of the forging,the α phase is equiaxed,while in the end face and surface regions of the forging,the grains exhibit deformation and elongation characteris-tics.Compared to the X and Y directions,the yield strength and tensile strength of the forg-ing in the Z direction are relatively lower,with values of 565 and 615 MPa,respectively.The mechanical property differences are mainly due to the microstructural heterogeneity at different positions of the forging.The average impact energies of the forging at room tempera-ture,-25℃,and-50℃are 82,73.5,and 67 J,respectively,showing no obvious tem-perature sensitivity.Under a cyclic loading of 1×107 cycles,the fatigue limit in the Z direc-tion is 375 MPa,and fatigue cracks mainly originate from the α/β phase interface.
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