Infrared and Laser Engineering, Volume. 47, Issue 11, 1106003(2018)
Study on microstructure and high cycle fatigue property of laser deposited TA15 titanium alloy
The microstructure of laser deposited TA15 titanium alloy was investigated and high cycle fatigue property including crack initiation and crack propagation at room temperature was analyzed. The fatigue fracture surface and microstructure of longitudinal section were examined by optical microscopy (OM) and scanning electron microscopy(SEM). The results indicate that as-deposited macrostructure consists of directional column grains with extremely fine basket-weave microstructure. After double-annealing treatment, coarse lamellar-like basket-weave microstructure was obtained. The crack initiation region was characterized by crystallographic cleavage facets of α lamellar. The crack tended to propagate tortuously, which was related to different orientations of α lamellar. Its propagation direction in certain areas was parallel or approximately perpendicular to α lamellar and the secondary cracks in the crack propagation region helped consuming energy and improved the fatigue life.
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Yang Guang, Liu Jiapeng, Qin Lanyun, Ren Yuhang, Wang Wei. Study on microstructure and high cycle fatigue property of laser deposited TA15 titanium alloy[J]. Infrared and Laser Engineering, 2018, 47(11): 1106003
Category: 激光技术及应用
Received: Jun. 10, 2018
Accepted: Jul. 28, 2018
Published Online: Jan. 10, 2019
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