|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
||Defect 3D Tomography and Fatigue Life Modeling of Electron Beam Fusion Additively Manufactured Ti-6Al-4V Alloy
||Shengchuan Wu, Philip J. Withers, Yanan Hu, Cheng Xie
|On-Site Speaker (Planned)
Based on synchrotron radiation X-ray micro computed tomography, the spatial defect number, size, morphology and distribution were extracted inside EBAMed Ti-6Al-4V alloy. The defect feature and the influence on fatigue properties were then characterized by considering the size, location and morphology of inner defects. Finally, a mechanistic model was tentatively developed to include the defect size, location and shape. Research results show that two types of defects were observed in terms of porosity and incomplete fusion with large dimension, less quantity and different morphology. Fatigue limit was obtained to approximately 730 MPa based on up-down experimental method, and the large scatter in fatigue lifetime could be correlated with the defect size, location and morphology, etc. Therefore, by integrating the defect location, dimension and morphology, a new fatigue life prediction method entitled X-parameter life prediction model was proposed on the basis of Z-parameter model for the EBAMed Ti-6Al-4V alloy.
||Additive Manufacturing, Mechanical Properties, Modeling and Simulation