TC4钛合金盘锻件显微组织和高温拉伸性能均匀性研究OA

A TC4 titanium alloy disk was fabricated via die forging followed by solution and aging heat treatment.The microstructure and corresponding high temperature tensile properties were systematic-ally investigated across three representative regions.The results reveal significant radial non-uniformity in high temperature tensile properties,the rim region exhibits the highest strength,the 1/2R region ap-pears the lowest,while ductility shows little difference among the three regions.Microstructure,texture and fracture surface analyses indicate that the non-uniformity in high temperature tensile properties ori-ginates from variations in the morphology and texture of α phase.The rim and hub regions contain fine secondary α phase with basket-weave morphology,which effectively suppresses dislocation motion and void coalescence,thereby enhancing strength without compromising ductility.In contrast,the 1/2R re-gion contains coarser secondary α phase with a colony-like morphology,promoting localized void growth and early fracture.In addition,due to the high Schmidt factor of the basal slip of the α phase in the 1/2R region,the tensile strength is reduced.