|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||GG-12: Microstructural Properties and Four-point Bend Fatigue Characteristic of Ti-6.5Al-2Zr-1Mo-1V Welded Joints by Electron Beam Welding
||Peng Liu, Tongguang Zhai, Yuanbin Zhang
|On-Site Speaker (Planned)
A high-cycle fatigue test was carried out on a Ti–6.5Al–2Zr-1Mo-1V titanium alloy by a four-point-bend of fatigue rig. The fatigue strength of base metal is about 120% of yield strength. The fatigue strength of joints is 814MPa, which is about 110% of yield strength. When the loading stress is higher, the fatigue failure region is located in middle weld zone of weld face, which the cracks are propagated along coarse β phase’s grain boundary. When the loading stress is lower, the fatigue failure region is located between the incomplete recrystallization zone and base metal. The crack nucleation resistance gradually increases from the WN to HAZ with the variable of loading stress and β phase → α+β phase→ α phase. The fatigue initiation region shows the quasi-cleavage crack characteristic, and the brittle phases and micro-holes could be the main reason to induce the fatigue fracture of welded joint.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)