Fatigue response,fracture characteristic and life modeling of a near-alpha titanium alloy under typical cyclic loadings in service
来源期刊：Rare Metals2016年第9期
论文作者：Jia Huang Yin-Yin Luo Peng-Tao Zhao Duo-Qi Shi Xiao-Guang Yang Hui-Chen Yu
文章页码：676 - 685
摘 要：Experimental investigations on the fatigue behavior of a near-alpha titanium alloy under typical cyclic loadings were carried out to simulate the service loading states applied on the engine blades.The axial stress-controlled tension–tension low-cycle fatigue（LCF） tests were carried out over a range of maximum stresses and stress ratios.The rotary bending tests were conducted using a step-loading procedure to reveal the high-cycle fatigue（HCF） limit stresses.The cyclic softening effect is observed in this material,and the strain ratcheting occurs obviously at the maximum LCF loading of 900 MPa.The LCF resistance is found to be dependent on both the maximum loading and the stress ratio.The HCF limit stresses for 1 9 107 and 1 9 106 cycles are determined as405.7 and 457.6 MPa,respectively.The macroscopic fatigue fracture mode and the failure features on fracture surfaces were analyzed by scanning electron microscope（SEM）.
Jia Huang1，Yin-Yin Luo2，Peng-Tao Zhao3，Duo-Qi Shi1，Xiao-Guang Yang1，Hui-Chen Yu3
1. School of Energy and Power Engineering,Beihang University2. Shanghai Electric Power Equipment Co.,Ltd.,Shanghai Steam Turbine Factory3. Beijing Institute of Aeronautical Materials
摘 要：Experimental investigations on the fatigue behavior of a near-alpha titanium alloy under typical cyclic loadings were carried out to simulate the service loading states applied on the engine blades.The axial stress-controlled tension–tension low-cycle fatigue（LCF） tests were carried out over a range of maximum stresses and stress ratios.The rotary bending tests were conducted using a step-loading procedure to reveal the high-cycle fatigue（HCF） limit stresses.The cyclic softening effect is observed in this material,and the strain ratcheting occurs obviously at the maximum LCF loading of 900 MPa.The LCF resistance is found to be dependent on both the maximum loading and the stress ratio.The HCF limit stresses for 1 9 107 and 1 9 106 cycles are determined as405.7 and 457.6 MPa,respectively.The macroscopic fatigue fracture mode and the failure features on fracture surfaces were analyzed by scanning electron microscope（SEM）.
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