Study on the Relationship between Fracture Structure Characteristics and Persistent Fracture of TA15 Titanium Alloy
Through a series of high-temperature endurance tests,combined with metallographic microscopy and scanning electron microscopy tissue analysis,the grain distribution near the endurance fracture of TA 15 titanium alloy and the correlation between deformation characteristics near the fracture and endurance fracture were studied.The results show that at a high temperature of 400 ℃ and a loading stress of 440 MPa,the transverse specimen has a longer endurance life compared to the longitudinal specimen,indicating its superior endurance performance.After observing the fracture location and microstructure characteristics of the clamping end,and comparing it with the persistent fracture time,it was found that the grain size at the fracture surface was significantly larger than that at the clamping end,and the microstructure at the persistent fracture surface was significantly elongated.The fracture structure under scanning electron microscopy shows that the fracture mode of the samples is ductile dimple aggregation fracture.After comparison,it was found that the crack propagation path of the transverse sample is tortuous,and the dimples are relatively deep,while the longitudinal sample shows an irregular shape with shallow dimples.
NETL
NSTL
万方数据
