Fatigue crack propagation behavior and mechanism of titanium alloy electron beam welded joints

• 作 者: Liu xin
• 机 构: ScienceandTechnologyonPowerBeamProcessesLaboratory,BeijingAeronauticalManufacturingTechnologyResearc
• 出 处: 2014国际高能束与特种能场制造暨第五届高能束流加工技术国际学术会议
• 发表日期: 2014年9期
• 关键词: Fatigue crack propagation titanium alloy electron beam welding

　　With situ observation of fatigue tests of notched specimen, the fatigue crack propagation process of titanium alloy electron beam welded joints was observed.The behavior of fatigue crack propagation was analyzed.On this basis, combined with the facture analysis, the mechanism of fatigue crack growth was researched.The results show that during the fatigue crack propagation stage of titanium alloy electron beam welded joints, there are shear deformation and cracking phenomena in the tip of crack.There is the plastic strain concentrated in the direction of the maximum shear stress and local plastic deformation produced in a very narrow range.There is basically no plastic deformation in the tip of crack, and the crack propagation was along the cleavage fracture surface.